JP3002826B1 - How to visually check the printing status with an inkjet printer - Google Patents

Abstract

A print condition of an ink jet printer is visually checked easily by printing a visual confirmation pattern. An inkjet printhead (PH) that forms inkjet rows at regular intervals in the length direction of the continuous paper so as to print the continuous paper (CP) while dividing the width direction into a plurality of rows, and controls the printheads. and a printing station PS, the M ₁ ~ M-th to the other surface of the ink jet printing unit and the continuous sheet of the first n ₁ ~ the n _n that performs printing of n colors on one surface of the continuous paper is subjected to printing of color M _In an inkjet printer composed of _n inkjet print units, when printing on continuous paper,
At the end of printing and during an arbitrary printing period, each inkjet print head prints a visual check pattern 52 consisting of halftone dots uniformly scattered in a band-like area BA extending in the width direction of the continuous paper, and prints the visual check pattern. The print status before and after is monitored according to the status.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer capable of continuous printing on continuous paper, and accurately and at a very high speed on a continuous paper moving relatively to the ink jet printer. Regarding the front and back double-sided printing, the front and back double-sided multi-color printing and the inkjet printing system that enables multi-layout printing, particularly, a visual confirmation pattern is printed during printing by the inkjet printer, and the printing state of the front and back both sides is visually confirmed by the visual confirmation pattern The present invention relates to a method for visually confirming a printing state by an ink jet printer which monitors the print condition.

[0002]

2. Description of the Related Art As is well known, various ink jet printers using an ink jet print head have been developed and provided. However, at present, the information processing system has been greatly advanced due to the diversification of information transmission, and existing ink jet printers that have been developed and provided in various ways cannot meet the needs of users. In other words, in the information processing system accompanying the diversification of information transmission, on the user side, there is a demand for the development of a system capable of separating various information for each specific person and continuously processing the information.
Furthermore, there is a demand for the development of a system that is compatible with the high quality, high resolution, and high-speed processing of such information processing.

Further, there is a demand for the development of an ink jet printing system capable of performing ultra-high-speed and accurate print processing on both sides, multi-color print processing and multi-layout print processing in processing various information. An ink jet printer that sufficiently satisfies the above-mentioned demands on the user side has not been provided so far.

[0004]

SUMMARY OF THE INVENTION The same applicant responds to the user's demands for the above-mentioned conventional ink-jet printer and, in order to solve the problems found in the conventional ink-jet printing system, divides a variety of information into specific information. High-quality, high-resolution, high-quality, high-resolution printing, multi-color printing, multi-layout printing, and multi-color printing can be performed at high speed. We have started developing an inkjet print system that can be performed accurately. Several problems were raised in the course of developing this inkjet printing system.

One of the problems is a printing state (print position shift, print synchronization shift, ink jet print head shift, print smear, missing dots, missing prints, ink, etc.) caused by the ultra-high-speed printing process on both sides of continuous paper. It is how to easily and accurately perform monitoring and inspection of the dropping of the waste).

Therefore, according to the present invention, a variety of information can be separated and processed continuously for each specific person, and it has high quality and high resolution. In an inkjet printing system that can perform print processing, multi-color print processing, and multi-layout print processing at ultra-high speed and accurately, the printing state of the printing unit printed by inkjet printing can be more easily and accurately checked. It is an object of the present invention to provide a method for visually confirming a printing state by an ink jet printer.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a first and a second arrangement in which a series of page width information is arranged in the width direction of a continuous paper so as to print a series of page width information. A plurality of ink-jet printing units are constituted by the two ink-jet printing heads, and the ink-jet printing units are arranged in the length direction of the continuous paper so as to perform N-color printing on one of the front and back surfaces of the continuous paper. First to N-th ink-jet printing units arranged regularly at regular intervals, and regularly spaced in the longitudinal direction of the continuous paper so as to print M colors on the other surface of the continuous paper. The first to M-th ink jet pudding units are arranged, and the front and back surfaces of continuous paper that moves relative to the ink jet pudding unit are provided on both sides. An inkjet printer that performs multi-color printing according to a desired layout pattern, wherein at the start of printing on the continuous paper, at the end of printing, and during any printing period, the continuous inkjet printing head A visual check pattern composed of halftone dots uniformly scattered in a band-shaped display area extending in the width direction of the print is printed, and depending on the printing state of the visual check pattern, various kinds of before and after the visual check pattern printing portion are formed. The present invention constitutes a method for visually confirming a printing state by an ink jet printer which monitors a printing state of an information printing portion.

Further, in the present invention, the halftone dots in the visual check pattern are 25 dots / cm ² per unit area.
Visual check method in the inkjet printing system is a halftone dotted 50 of uniform dots / cm ² constitutes a.

Still further, according to the present invention, the visual check pattern is printed by the first and second ink jet print heads for each of the print units at a position corresponding to the left and right in the width direction of the continuous paper. This also constitutes a visual confirmation method in an ink jet print system comprising:

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a printing verification device in an ink jet printing system according to the present invention will be described.
This will be described in detail based on a specific embodiment shown in the drawings. FIG. 1 is an overall view of an example of a basic apparatus configuration of an inkjet printing system according to the same applicant, and FIG. 1A is a schematic plan view of the apparatus.
B is a schematic front view corresponding to FIG. 1A. FIGS. 2 and 3 show an embodiment in which the visual checking device according to the present invention is combined with an example of the configuration of the apparatus, together with the state of the running path of continuous paper as a print medium in the apparatus. 2 is a schematic front view showing a print processing unit on the upstream side of the apparatus and on the front side of the continuous paper through the continuous paper, and FIG. 3 is a downstream side of the apparatus and the back side of the continuous paper. FIG. 4 is a schematic front view showing a side print processing unit as seen through continuous paper. 2 and 3, the rightward upward arrow shown in FIG. 2 is continuous with the leftward upward arrow shown in FIG.

FIG. 4 is a block diagram related to a plan view of the apparatus for explaining the outline of the ink jet printing system. FIG. 5 is a schematic perspective view illustrating an example of a sheet feeding unit in the apparatus. FIG. 6 is a schematic perspective view showing an example of a printed pattern by the ink jet printing system. FIG. 7 shows an example of a print layout in the length direction of the continuous paper. FIG. 7B is a schematic plan view showing an example of a single layout, and FIG. 7B is a schematic plan view showing an example of a multi-layout, which includes an invoice with a description of a different information amount in the length direction of the continuous paper. FIG. 7C is a schematic plan view showing another example of the multi-layout, and showing an example for direct mail including a letterhead area in the length direction of the continuous paper.

On the other hand, FIG. 8 is a schematic view showing a specific example of a visual confirmation pattern formed by a printing process on continuous paper in a method for visually confirming a printing state by an ink jet printer according to the present invention. FIG.

First, a specific configuration of an ink jet printing apparatus to which the present invention is applied will be described with reference to FIGS. According to this specific embodiment, the inkjet printing apparatus includes a paper feed unit 6, a first print processing unit 1, a second print processing unit 2, and a third print processing unit 3 for continuous paper CP. , Fifth print processing unit 5, fourth print processing unit 4, processing unit 7, and paper discharge unit 8
Consists of one line. In this configuration, what is particularly noticed is that the fourth print processing unit 4 and the fifth print processing unit 5 are reversed in one line. A detailed description on this point will be described later.

As shown in detail in FIG.
Has a continuous paper holding unit 9 that rotatably holds a roll of continuous paper CP. The continuous paper holding unit 9 is provided with a lifting arm 10, an arm guide plate 11, a side lay handle 12, a lifting lever 13, and an impact wrench 14.

The paper feed section 6 is provided with a powder brake mechanism 15. The powder brake mechanism 15 includes a tension control detection roll 1 installed in the paper feeding unit 6.
6 controls the powder brake provided on the paper feed shaft so as to obtain a desired tension. The tension control detection roll 16 detects the continuous paper tension (tension) in the machine, and controls the powder brake so that the continuous paper keeps a constant tension (set value by the tension control) while the continuous paper is running at a constant speed. I do. Reference numeral 17 denotes a powder brake operation panel.

The paper feed section 6 is provided with a paper dust removing device 18, a static electricity removing device 19, a first guide roller 20, and an edge guider 21. The first guide roller 20 and each of the guide rollers 22 provided in the running path of the continuous paper CP in the machine are constituted by ball bearings having a small rotational load, whereby the tension of the continuous paper is reduced. And enable ultra-high speed running. Further, the edge guider 21 is for preventing the continuous paper from meandering, thereby also enabling ultrahigh-speed traveling.

Next, the relationship of the running path of the continuous paper CP to the ink jet printing apparatus will be described with reference to FIGS. The continuous paper CP set in the paper supply unit 6 includes a first guide roller 20, an edge guider mechanism 21, a guide roller group 22, and a platen roller P.
Along the continuous paper path formed by R1 to PR5, an average of 200
Super high speed running at m / min. (MAX 260m / min.) is possible.

The continuous paper CP is supplied to a first drying unit 24 provided downstream of the second print processing unit 2 and the third drying unit 24.
Drying means 2 provided downstream of the print processing unit 3
5, a third print processing unit 5 provided downstream of the fifth print processing unit 5;
Detouring through the drying means 26 via the guide roller group 22.

Each of the drying means 24, 25, and 26 is of a microwave drying type using a microwave, and reduces damage (expansion and contraction) to the running continuous paper CP.
Ultra-high-speed printing is enabled by performing efficient drying. The temperature of the microwave drying apparatus is set to be between room temperature and 55 ° C. for the purpose of preventing dew condensation in the drying oven. The surface temperature of the continuous paper after drying was about 70 ° C.

The ink jet printing apparatus includes a continuous paper reversing and traveling mechanism 27 for running the continuous paper CP in a state where the continuous paper is turned upside down in the ink jet printing apparatus. The continuous paper reversing and traveling mechanism 27 is provided between the third print processing unit 3 and the fourth print processing unit 4, and is connected to the first print processing unit 1 to the third print processing unit 3. The running direction of the continuous paper in the fourth print processing unit 4 to the fifth print processing unit 5 is configured to be opposite to the running direction of the continuous paper.

Accordingly, the continuous paper CP is the first paper.
The first to third print processing units 3 travel in the inkjet printing apparatus with the first surface (front surface) facing upward, and the fourth print processing unit 4
The fifth print processing unit 5 travels in the inkjet printing apparatus with the second surface (back surface) facing upward, and as shown in FIG. The printing process is performed on the front surface, and the printing process is performed on the back surface of the continuous paper CP on the downstream side of the apparatus as shown in FIG.

The ink jet printing apparatus includes a first monitoring means 28 for monitoring a printing process state and a second monitoring means 28 for monitoring a printing process state.
Monitoring means 29. The first monitoring means 28
Is a television camera for monitoring the printing state of the printing performed on the front side of the continuous paper CP by the first print processing unit 1 to the third print processing unit 3, and the second monitoring unit 29 4 is a television camera that monitors the print state of the continuous paper CP printed on the back side by the print processing unit 4 to the fifth print processing unit 5.

The ink jet printing apparatus has platen rollers PR1 to PR5 for each of the print processing units. The platen rollers PR1 to PR5 are installed below the print head. For example, in the first platen roller PR1, the third platen roller PR3, and the fourth platen roller PR4, the continuous paper CP is used.
Is run so that the contact angle in the running direction is about 120 °. The continuous paper wound around is held down by a rubber roller or the like to prevent slippage between the continuous paper and the platen roller, thereby improving the print quality at ultra-high speed with a precise feed amount.

The ink jet printing apparatus has a random processing section 7 for a printed continuous paper.
The random processing unit 7 performs, on the printed continuous paper, punching of a marginal hole row, punching of a filing hole, horizontal perforation, vertical perforation, etc., based on a detection mark printed online. Do it. In the processing position alignment in the random processing section 7, the entire drive box for vertical and horizontal perforation processing and file punch processing is controlled to be aligned with the detection mark position, so that the load on the continuous paper is reduced without difficulty, and the driving of the processing apparatus is performed. By adopting the method of directly controlling the system, it is hardly affected by the continuous paper, the control time is short, and random processing at ultra high speed is possible.

In the random processing section 7, mainly for perforation processing, two of the perforations may be installed and operated alternately to cope with high-speed processing.

The ink jet printing apparatus has a paper discharge section 8 at the final stage of the apparatus. In the embodiment shown in the figure, the paper discharge section 8 is constituted by a winding means for winding the printed continuous paper into a roll.
The printed continuous paper can be appropriately processed into a roll shape, a folded shape, and a sheet shape according to the final product form.

Further, in the ink jet printing apparatus, a system in which the print heads PH1 to PH10 are pulled out to the operation side can be adopted. With this configuration, it is possible to run continuous paper with stable in-machine tension immediately after the start of the next work without changing the in-machine tension during printhead maintenance work required for ink-jet printing work. can do.

Next, the configuration of the first to fifth print processing units 5 in the ink jet printing apparatus will be described in detail. First, FIG.
In the embodiment shown in FIGS. 4 to 4, the inkjet printing apparatus has a 10-head configuration, and prints the front side of the continuous paper CP in three colors of black, blue, and red, and prints the continuous paper CP. The back side is configured to print in two colors, black and blue. The above configuration is
In one embodiment, the number of colors and the types of colors are not limited at all.

[0029] The ink jet printing apparatus has a 10
Of the ten ink jet print heads PH1 to PH10, and two of the ten ink jet print heads PH1 to PH10 form a pair of print units PU1 to PU5, and these print units PU1 to PU5 are formed. This constitutes the inkjet printing means 30.

The ink jet printing means 30 comprises:
The system controller 31 comprises a data system DS1 to DS5 for controlling each of the print units PU1 to PU5 and a print station PS1 to PS10 for controlling each of the ink jet print heads PH1 to PH10. A print signal is supplied to the heads PH1 to PH10.

The ink jet print head PH1
PH10 to PH10 are arranged so as to perform continuous printing over the page width on continuous paper CP which moves relatively in the direction of arrow A with respect to the ink jet printing apparatus. Each inkjet print head PH1 to P
H10 consists of a printhead that forms a regularly spaced array of inkjet rows, 4.25 inches long and 240 dots per inch.

The ink jet printing apparatus includes platen rolls PR1 to PR5 each having a tach encoder TE1 to TE5 for each of the print units PU1 to PU5.
And the tach encoders TE1 to TE5 are
The movement of the continuous paper CP is monitored, and a speed signal for cooperating with the movement of the continuous paper CP is transmitted via the tach encoder / queue controller 50 to the data systems DS1 to DS1.
Output to DS5.

Further, the ink jet printing apparatus detects a cue mark 32 for detecting a cue mark 32 printed on the continuous paper CP or printed by the first print unit PU1 for each of the print units PU1 to PU5. Means MS1 to MS5 are provided. The cue mark detecting means MS1 to MS5
Detects the cue mark 32 and outputs a cue mark detection signal, which adjusts the printing of information on the continuous paper CP. The output signal of the cue mark detecting means MS1 is transmitted to the sheet transporting device 51 and the system controller 31.
And the output signals of the cue mark detecting means MS2 to MS5 are supplied to the data systems DS1 to DS via the tacho encoder / queue controller 50 and the system controller 31, respectively.
Supplied to 5.

The cue mark 32 is a timing mark for adjusting the print position in each of the data systems DS1 to DS5. A cue mark read signal is sent to each of the data systems DS1 to DS5, whereby printing is performed. Be started. The cue mark 32 is printed at a predetermined position on the continuous paper at the supply stage of the continuous paper CP,
For the blank continuous paper in the supply stage of the continuous paper CP, the first
Print processing by the print unit PU1.

The cue mark 32 is provided for the cue mark display area 33. The cue mark 32 is a rectangular mark having a size in the length direction of the continuous paper of about 6 mm and a size in the width direction of the continuous paper of about 5 mm.

Next, a pattern of a product printed by the ink jet printing system will be described with reference to FIGS. According to the inkjet printing system described above, a printed product having a pattern as shown in FIG. 6 can be provided. That is,
Provide printed products that enable front and back double-sided printing, front and back double-sided multicolor printing, and front and back double-sided multi-layout printing. According to the example shown in FIG. 6, one side (front side) CPa and the other side (back side) CPb of the continuous paper are provided with an address and a name 34 for each customer, an individual message 35, a detail item 36 (a detail item 36). Can be printed as many as the number of pages required for each individual, and can be printed continuously on the back side for customers with many specification items), imprints 37, frames 38, logos, illustrations, maps 39, etc. Is done.

Further, according to the above-described ink jet printing system, it works extremely effectively particularly for a multi-layout print as exemplified in FIGS. 7B and 7C. For example, according to the example shown in FIG. 7B, when laying out a bill with a statement, one bill in the length direction of the continuous paper CP is allocated to the bill area 4 in accordance with the number of detail items.
With respect to 0, the specification area 41 for writing specification items can be set by appropriately changing the number of pages. FIG. 7C
According to the example shown in FIG. 7, when laying out a direct mail, the mail is divided into one in the length direction of the continuous paper CP such as a letter head area 42, a greeting area 43, a product guidance area 44, and an application form area 45. Can be set. FIG.
B and FIG. 7C show an example of a multi-layout on the front side of the continuous paper, but this multi-layout can be carried out without change on the back side of the continuous paper as shown in FIG. it can. These are merely examples, and the range of the multi-layout is not limited to the above configuration and the example shown in the drawings.

Next, with respect to a method of visually confirming a printing state by an ink jet printer according to the present invention, a specific example of a visually confirming pattern formed by printing processing on continuous paper will be described with reference to FIG.
According to the present invention, the visual check pattern 52 is printed by the respective inkjet print heads at the start of printing on the continuous paper, at the end of printing, and during an arbitrary printing period in the printing process on the continuous paper by the inkjet printer. You.

In the present invention, the visual check pattern 52 is provided in a strip-shaped display area 53 extending in the width direction of the continuous paper CP. The display area 53 has a dimension L in the width direction of the continuous paper CP and has a dimension W in the length direction of the continuous paper CP. According to a preferred embodiment, the dimension L is about 210mm to 220mm (The width of the continuous paper used is A
The size W is about 8.5 inches in the embodiment forming the short side of the four sizes, and the dimension W is about 40 mm to 50 m.
m.

The display area 53 in the visual check pattern 52 includes, for example, the one shown in FIG. 8 which is constituted by halftone dots 54 which are uniformly scattered. Colored dots are arranged in a relatively dense state in a relatively dense state, and the white background area and the colored dots are present at the same ratio per unit area, and preferably, about 25 dots / cm ² to 50 dots per unit area /
and it consists cm ² is one, and more preferably, from about 3
It is about 4 dots / cm ^{2 to} 35 dots / cm ² .

Further, in the present invention, the visual check pattern 52 includes an area dividing line 55 extending in the width direction of the continuous paper CP on at least one of the front edge 53a and the rear edge 53b of the display area 53. ing. The area division line 55 is a leading edge 53a of the display area 53.
And at both the trailing edge 53b. In the printing of only the halftone dots 54, since the boundary between the non-dotted portion and the halftone-printed portion is hard to be discriminated by the naked eye due to the background of the paper, the printing color is dark. The purpose of this is to make the above-mentioned printing state easy to confirm by making the lines expressible.

Further, in the present invention, the visual check pattern 52 includes the first and second inkjet print heads PH for each of the print units PU.
1 and PH2, including a continuous page number display 56 that is printed at the left and right corresponding positions in the width direction of the continuous paper CP.

According to the present invention, in addition to the printing state (dirt, missing, head adjustment state), the synchronization state between a pair of two print heads constituting one data system DS can be confirmed. . This is to visually confirm that the synchronization state of a pair of two print heads that always express and print 8.5 inch width is shifted back and forth for some reason. The continuous page number display 56
Is provided for this purpose, and prints the same left and right numbers continuously from the start of printing to the end of printing (including the visual check pattern and data). If the synchronization state between the pair of two print heads is lost, the numbers are similarly shifted, so that they can be visually confirmed.

[0044]

According to the method for visually confirming the printing state by the ink jet printer of the present invention having the above structure,
In an inkjet printing system capable of performing multicolor printing according to a desired layout pattern in accordance with the desired layout pattern on both sides of a continuous paper moving relatively to the inkjet printer, while enabling ultra-high speed traveling, Print position deviation, print synchronization deviation, print head deviation, print smear, missing dots,
The printing state such as printing omission and ink drop is monitored by monitoring the visual confirmation pattern printed on the continuous paper, so that the visual confirmation pattern is constituted by extremely fine halftone dots. It can be said that the check can be performed very accurately and very accurately, and that the print quality can be improved.

Further, according to the method for visually confirming the printing state by the ink jet printer of the present invention, various information is separated for each specific person and processed continuously, and high quality and high resolution are obtained. In processing such information, it can be said that this method is extremely effective in that the printing process on both the front and back surfaces, the multi-color printing process, and the multi-layout printing process can be accurately performed at a very high speed.

Further, according to the method for visually confirming the printing state by the ink jet printer according to the present invention, the super high-speed printing process is enabled, so that not only the cost for printing but also the overall cost can be reduced. It can be said that this works extremely advantageously in that the printing work can be leveled.

[Brief description of the drawings]

FIG. 1 is an overall view of an example of a basic device configuration of an ink jet printing system, and FIG.
1 is a schematic plan view of the device, and FIG.
It is a schematic front view corresponding to A.

FIG. 2 is a view showing a state of a running path of continuous paper as a print medium in the apparatus, in which a print processing unit on an upstream side of the apparatus and a front side of the continuous paper is continuously printed; It is a schematic front view shown by seeing through paper.

FIG. 3 is a schematic front view showing a print processing unit on the downstream side of the apparatus and on the back side of the continuous paper as seen through the continuous paper.

FIG. 4 is a block diagram shown in connection with a plan view of an apparatus for explaining an outline of an inkjet printing system.

FIG. 5 is a schematic perspective view illustrating an example of a sheet feeding unit in the apparatus.

FIG. 6 is a schematic perspective view showing an example of a pattern printed by the inkjet printing system.

7A and 7B illustrate an example of a print layout in the length direction of continuous paper. FIG. 7A is a schematic plan view illustrating an example of a single layout.
FIG. 7B is a schematic plan view showing an example of a multi-layout including an invoice with a description having a different information amount in the length direction of the continuous paper, and FIG. FIG. 11 is a schematic plan view showing an example for direct mail including a letterhead area in the length direction of the continuous paper.

FIG. 8 is a schematic view showing a specific example of a visual confirmation pattern formed by printing processing on continuous paper in a method for visually confirming a printing state by an ink jet printer according to the present invention. It is a top view.

[Explanation of symbols]

 CP continuous paper 1 First print processing unit 2 Second print processing unit 3 Third print processing unit 4 Fourth print processing unit 5 Fifth print processing unit 6 Paper feed unit 32 Cue mark 52 Visual check pattern 52A ５２52E Visual confirmation pattern 53 which is a different example 53 Display area 54 Halftone dot 55 Area division line 56 Continuous page display DS1 5DS5 Data system PS1 ＰＳPS10 Print station PU1 ＰＵPU5 Print unit PH1 ＰＨPH10 Print head PR1 ＰＲPR5 Platen roller TE1 ＴＥTE5 Tacho encoder MS1 to MS5 Cue mark detection means

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Saito 1-9-1 Konan, Minato-ku, Tokyo NTT Communicationware Corporation (56) References JP-A-9-76480 (JP, A) JP-A-8-216467 (JP, A) JP-A-63-158573 (JP, A) JP-A-10-100368 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) B41J 2/01

Claims (3)

(57) [Claims] 1. A first and a second arrangement arranged over a page width to print a series of page width information in a width direction of the continuous paper.
A plurality of ink-jet pudding units are constituted by the ink-jet printing head, and the ink-jet pudding unit is arranged in a lengthwise direction of the continuous paper so as to perform N-color printing on one of the front and back surfaces of the continuous paper. First to Nth ink-jet pudding units arranged at regular intervals, and regularly arranged in the length direction of the continuous paper so as to print M color on the other surface of the continuous paper. And an M-th inkjet pudding unit for performing multi-color printing in accordance with a desired layout pattern on both the front and back sides of continuous paper moving relatively to the inkjet pudding unit. In the start of printing on the continuous paper, at the end of printing and during any printing period, the respective inks The jet print head prints a visual check pattern composed of halftone dots uniformly scattered in a band-like display area extending in the width direction of the continuous paper, and the visual check pattern is printed according to the printing state of the visual check pattern. A method for visually confirming a printing state by an ink jet printer, wherein a printing state of various information printing parts before and after a confirmation pattern printing part is monitored. 2. A halftone dot in the visual check pattern,
^2. The visual check method according to claim 1, wherein the dots are uniformly scattered from 25 dots / cm < ² > to 50 dots / cm < ² > per unit area. 3. The visual check pattern includes a continuous page number indication printed by the first and second ink jet print heads at right and left corresponding positions in a width direction of the continuous paper for each of the print units. The visual confirmation method in the ink jet print system according to claim 1, wherein: