JP2979397B1 - Left-right printing synchronization deviation detection device for inkjet printer - Google Patents

Abstract

The present invention relates to a method for reliably detecting and controlling synchronization deviation between left and right printing of a page width in a case where information of a page width is divided in a width direction and printed by a plurality of print heads over the page width of a continuous sheet. . A plurality of inkjet print heads (PH) are provided.
Thereby, on both side tracks ST along both widthwise edges of the front surface CPa and the back surface CPb of the continuous paper CP,
Front to back alternately first to fourth left and right print synchronization confirmation mark rows 6
1, 62, 63, 64, and sensor means 70 for detecting the first to fourth left-right printing synchronization confirmation mark strings at detection points SP1 to SP11 of a predetermined distance are provided. A left-right printing synchronization deviation detecting apparatus in an inkjet printer, wherein each left-right printing synchronization confirmation mark in a row is a block mark having a length dimension X along the continuous paper length direction and a width dimension Y along the continuous paper width direction. .

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. The present invention relates to an ink jet printing system that enables front and back double-sided printing, front and back double-sided multi-color printing, and multi-layout printing, and in particular, divides page width information in the width direction across the page width and prints with a plurality of print heads. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a left-right printing synchronization deviation detecting device for detecting a synchronization deviation between page width left-right printing in an inkjet printer.

[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 inkjet 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 case where information of the page width must be divided in the width direction over the page width of the continuous paper and printed by a plurality of print heads (4.2).
A4 size (width 210
mm) on a continuous sheet of paper over a page width, a pair of 4.25 inch print heads is used.) In this case, it is necessary to reliably and precisely synchronize the printing on the left and right of the page width.

Therefore, according to the present invention, a variety of information can be separated and processed continuously for each specific person, and it has a high quality and a high resolution. Provided is a left / right print synchronization deviation detection device for an inkjet printer that reliably detects and controls the synchronization deviation between left and right page width printing when information on a page width is divided in the width direction and printed by a plurality of print heads over the width. Is to do.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention specifically has a first and a second arrangement in which inkjet rows having a page width are formed in the width direction of continuous paper. A plurality of ink jet print units including an ink jet print head are configured, and the ink jet print unit is regularly 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. the M at the inkjet printing unit of the first n ₁ ~ the n _n which is spaced, regularly spaced in the longitudinal direction of the continuous paper to perform printing of the M colors on the other surface of the continuous paper ₁ to _Mn-th ink jet print units, and the front and back surfaces of continuous paper moving relatively to the ink jet print units, In an ink jet printer that performs multicolor printing according to a desired layout pattern corresponding to the back, each of the ink jet print heads on both side tracks along both edges in the width direction on the front and back sides of the continuous paper. , Alternately 1st to 1st
Left and right printing synchronization deviation in an ink jet printer comprising a sensor means for printing a fourth left and right printing synchronization confirmation mark string and detecting the first to fourth left and right printing synchronization confirmation mark strings at detection points at a preset distance. It constitutes a detection device.

Further, according to the present invention, the first left-right print synchronization confirmation mark string is provided on one of the side tracks in the width direction on the other surface of the continuous paper, and the M ₁ -M _{n -th} print synchronization confirmation mark strings are arranged on the other side.
Among the print units, the odd-numbered inkjet print heads are sequentially printed adjacent to each other, and the second right / left print synchronization confirmation mark row is arranged on the other side track in the width direction on one surface of the continuous paper. Among the N ₁ to N _n -th print units, even-numbered ink jet print heads are sequentially printed adjacent to each other, and the third left / right print synchronization confirmation mark row has a width on the other surface of the continuous paper. Printed on the other side track in the direction by the even-numbered inkjet print heads of the M ₁ to M _n print units sequentially in an adjacent state,
The fourth left and right print synchronization confirmation mark strings are sequentially placed on one side track in the width direction on one surface of the continuous paper by the odd-numbered inkjet print heads of the N ₁ to N _n print units. A left-right printing synchronization deviation detecting device in an ink jet printer composed of those printed in an adjacent state is constituted.

Further, according to the present invention, each of the left and right print synchronization confirmation marks in each of the left and right print synchronization confirmation mark strings has a length dimension X along the length direction of the continuous paper and a width along the width direction of the continuous paper. A block mark having a dimension Y, and a first mark in the first left / right printing synchronization confirmation mark row.
Only the left and right print synchronization confirmation marks are block marks having a length dimension X + α, and constitute a left and right print synchronization deviation detecting device in the ink jet printer.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an apparatus for detecting misalignment of left and right printing in an ink jet printer according to the present invention. FIG. 1 is an overall view of a basic device configuration example of an inkjet printing system according to the same applicant, FIG. 1A is a schematic plan view of the device, and FIG. FIG. 7 is a corresponding schematic front view. FIG.
FIG. 3 and FIG. 3 show an embodiment in which the left / right printing synchronization deviation detecting apparatus according to the present invention is combined with an apparatus configuration example, together with the state of a running path of continuous paper as a print medium in the apparatus. FIG. 2 is a schematic front view showing the print processing unit on the upstream side of the apparatus and the front side of the continuous paper through the continuous paper, and FIG. FIG. 4 is a schematic front view showing a print processing unit on the back side through a 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 plan view according to the present invention, showing the form of a left-right print synchronization confirmation mark row for continuous paper and a specific configuration example of each sensor means. 8A is a schematic plan view showing a configuration example on the front side of the continuous paper, and FIG. 8B is a schematic plan view showing a configuration example on the back side of the continuous paper. FIG. 9 is an imaginary diagram in which the left and right print synchronization confirmation mark strings are continuous on a straight line, and is an explanatory diagram for explaining the relationship between each left and right print synchronization confirmation mark and a detection point. FIG. 10 shows a mode of the shift of the detection point with respect to the actually printed right and left print synchronization confirmation mark, and FIG. 10A illustrates a pattern in which NG is OK due to the shift of the detection point. FIG. 10B shows that OK is N due to the detection point shift.
The pattern which becomes G is illustrated.

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 are paired to form 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, a specific embodiment of the left / right printing synchronization deviation detecting device for the above-described ink jet printing system will be described with reference to FIGS. This will be described in detail with reference to FIG. 3 and FIGS. According to the present invention, each of the left and right printing synchronization confirmation marks CM
In the process of printing on continuous paper by the inkjet printer, each of the inkjet print heads P at the start and end of printing on continuous paper.
Print processing is performed by H1 to PH10.

According to the embodiment shown in FIG. 8, the left / right print synchronization confirmation mark CM is a confirmation mark CM printed in black by the ink jet print head PH1.
1, a confirmation mark CM2 printed in black, for example, by the inkjet print head PH2, a confirmation mark CM3 printed in red, for example, by the inkjet print head PH3, the inkjet print head PH
4, the confirmation mark CM4 printed in red, for example,
A confirmation mark CM5 printed in blue, for example, by the inkjet printhead PH5, a confirmation mark CM6 printed in blue, for example, by the inkjet printhead PH6, a confirmation mark CM7 printed in black, for example, by the inkjet printhead PH7, and an inkjet printhead PH8. For example, the check mark CM8 is printed in black, the check mark CM9 is printed in blue by the inkjet print head PH9, and the check mark CM10 is printed in blue by the inkjet print head PH10.

The left and right printing synchronization confirmation mark CM has a length X (about 13 mm) along the length of the continuous paper CP and a width Y (about 10 m) along the width of the continuous paper.
m). Of the left and right print synchronization confirmation marks CM, only the confirmation mark CM7 is a block mark having a length dimension X + α (about 16 mm).

The left / right printing synchronization confirmation mark CM is a first side track ST1 on the front side CPa of the continuous paper CP (according to the embodiment shown in FIG. 8A, the side on which the cue mark 32 is provided, The cue mark 3
The track that deviates from the track on which No. 2 is provided. The position at which the cue mark 32 is provided is not limited to the embodiment shown in FIG. 8A, but may be any position as long as it is set in advance within each page area of the continuous paper CP. ), The confirmation mark CM1 and the confirmation mark CM
3. The confirmation marks CM5 are sequentially printed adjacent to each other to form a fourth left / right print synchronization confirmation mark row 64, and the second side track ST2 (the cue mark 32 is provided on the front side CPa of the continuous paper CP). On the other side, the confirmation mark CM2, the confirmation mark CM4, and the confirmation mark CM6 are sequentially printed adjacent to each other, and the second
Of the left and right printing synchronization confirmation mark strings 62.

The left and right printing synchronization confirmation marks CM are provided with a confirmation mark CM8 and a confirmation mark CM10 with respect to the third side track ST3 on the back side CPb of the continuous paper CP.
Are sequentially printed adjacent to each other, forming a third left / right print synchronization confirmation mark column 63, and the back side C of the continuous paper CP.
A confirmation mark CM7 and a confirmation mark CM9 are sequentially printed adjacent to each other on the fourth side track ST4 in Pb to form a first left / right print synchronization confirmation mark row 61.

On the other hand, in the present invention, the left / right printing synchronization deviation detecting device comprises a sensor means for detecting the first to fourth left / right printing synchronization confirmation mark strings 61, 62, 63 and 64 at detection points of a preset distance. 70. The sensor means 70 includes a sensor 71A for detecting the fourth left / right printing synchronization confirmation mark array 64 from the front side CPa of the continuous paper CP, and the second left / right printing synchronization confirmation mark from the front side CPa of the continuous paper CP. A sensor 71B for detecting a row, a sensor 72A for detecting the third left / right printing synchronization confirmation mark row 63 from the back side CPb of the continuous paper CP, and a first left / right printing synchronization confirmation from the back side CPb of the continuous paper CP. Sensor 7 for detecting mark row 61
2B.

Next, based on FIGS. 9 and 10,
An aspect in which the sensor means 70 detects the first to fourth left and right print synchronization confirmation mark strings 61 to 64 at detection points of a preset distance will be described. The first to first
It is assumed that the fourth left and right print synchronization confirmation mark strings 61 to 64 are made continuous as shown in FIG. On the other hand, eleven detection points SP1 to SP11 are set in advance to distances L1 to L11, respectively. The detection points are moved forward and backward by changing the preset values.

In the present invention, there may be a case where a difference between an actual mark and a detection point occurs due to a change in printing speed and a state of the detection sensor. In such a case, it is necessary to correct the mark.
If the detection points are shifted, even if one of the synchronization confirmation marks CM is missing, as in the example shown in FIG. 10A, the marks before and after that may be detected and an OK display may appear. . Conversely, as in the example shown in FIG. 10B, there may be a case where the detection point detects a point where there is no mark and displays NG, even though the synchronization confirmation mark CM is normally printed. In these cases, it is necessary to correct the detection points.

According to the present invention, if all of the above 11 detection points are detected, the result is OK, and if none of the detection points is detected, the result is NG. Missing information printed on the continuous paper and left and right printing deviations can be detected based on the printing state of each of the left and right printing synchronization confirmation mark strings.

[0047]

According to the present invention, the apparatus for detecting misalignment of left and right prints in an ink jet printer according to the present invention has a desired layout pattern corresponding to the front and back sides of continuous paper moving relatively to the ink jet printer. Inkjet printing system that can perform multi-color printing in accordance with (1) and (2). It can be said that this works extremely effectively for various information processing in that the quality can be improved and the collation of the front and back information can be ensured.

Further, according to the ink jet printing system of the present invention, it is possible to separate various information for each specific person and to continuously process the information, and it has high quality and high resolution. In this regard, it can be said that this 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 ink jet printing system of the present invention, by enabling ultra-high-speed printing, not only can the printing cost be reduced, but also the overall cost can be reduced, and the printing work can be leveled. It can be said that it works extremely advantageously in such a point that realization can be realized.

Further, according to the ink jet printing system of the present invention, since the printing process can be performed on both the front and back surfaces, the surplus of the specification items can be continuously printed on the back surface of the continuous paper. This can be said to be extremely advantageous in that the number of print pages, paper cost, and mailing cost can be reduced, and the amount of enclosed materials can be increased.

[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 plan view showing an aspect of a left-right print synchronization confirmation mark row for continuous paper and a specific configuration example of each sensor means according to the present invention; 8A is a schematic plan view showing a configuration example on the front side of the continuous paper, and FIG. 8B is a schematic plan view showing a configuration example on the back side of the continuous paper.

FIG. 9 is an imaginary diagram in which left and right print synchronization confirmation mark strings are continuous on a straight line, and is an explanatory diagram for explaining the relationship between each left and right print synchronization confirmation mark and a detection point.

FIG. 10 is a diagram illustrating a state of a shift of a detection point with respect to an actually printed right and left print synchronization confirmation mark. FIG. 10A illustrates a pattern in which NG is OK due to a shift of the detection point. And FIG. 10B
Illustrates a pattern in which OK changes to NG due to a detection point shift.

[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 marks CM1 to CM10 Left / right printing Synchronization confirmation mark ST1 First side track ST2 Second side track ST3 Third side track ST4 Fourth side track 61 First left / right printing synchronization confirmation mark string 62 Second left / right printing synchronization confirmation mark string 63 Third Of left and right printing synchronization confirmation mark 64 64 Fourth left and right printing synchronization confirmation mark 70 DS5 data system PS1 to PS10 print station PU1 to PU5 print unit PH1 to PH10 Print head PR1 to PR5 Platen roller TE1 to TE6 Tacho encoder MS1 to MS8 Cue mark detecting means

Claims (3)

(57) [Claims] A plurality of inkjet print units including first and second inkjet print heads arranged so as to form an inkjet row having a page width in a width direction of the continuous paper, wherein the inkjet print unit comprises: and inkjet printing unit of the first n ₁ ~ the n _n which is regularly spaced in the longitudinal direction of the continuous paper to perform printing of the n colors on one surface of the front and back surfaces of the continuous paper, the continuous paper M on the other side of
Regularly consists of a jet printing unit of the M ₁ ~ the M _n at intervals in the longitudinal direction of the continuous paper to perform printing color, front and back sides of continuous paper which moves relative to the ink jet printing unit An ink jet printer which performs multicolor printing according to a desired layout pattern in correspondence with both sides, front and back, respectively, wherein each of the ink jet print heads, both sides along the width direction both edges on the front and back sides of the continuous paper A sensor means for alternately printing first to fourth left and right print synchronization confirmation mark strings on a track and detecting the first to fourth left and right print synchronization confirmation mark strings at detection points at a preset distance. A left / right printing synchronization deviation detecting device in an ink jet printer, which is provided. Wherein said first lateral print synchronization confirmation mark columns, odd-numbered ink jet of printing unit of the first M ₁ ~ the M _n on one side track in the width direction of the other surface of the continuous paper The print heads are sequentially printed adjacent to each other, and the second left-right print synchronization confirmation mark row is arranged on the other side track in the width direction on one surface of the continuous paper in the N ₁ -N _{n -th order.} Among the print units, the third right and left print synchronization confirmation mark strings are sequentially printed on the other side track in the width direction on the other surface of the continuous paper by the even-numbered inkjet print heads. It is printed sequentially adjacent to each other by the even-numbered ink jet print head of the printing unit of the first M ₁ ~ the M _n Is and said fourth lateral printing synchronization confirmation mark columns, odd-numbered ink jet printing of the printing unit of the on one side track in the width direction of the one surface of the continuous paper first N ₁ ~ the N _n 2. The apparatus according to claim 1, wherein the heads are sequentially printed adjacent to each other by a head. 3. Each of the left and right printing synchronization confirmation marks in each of the left and right printing synchronization confirmation mark strings has a length dimension X along the length direction of the continuous paper and a width dimension Y along the width direction of the continuous paper.
And a block mark having a length X + α only in the first left / right printing synchronization confirmation mark string. 3. A device for detecting misalignment of left and right printing in the inkjet printer according to 2.