CN101722747A

CN101722747A - Multi-point correcting method for bidirectional printing ink drop offset of broad width ink jet printer

Info

Publication number: CN101722747A
Application number: CN200810223980A
Authority: CN
Inventors: 张原�
Original assignee: Beijing Yameike Software Co ltd
Current assignee: Beijing Yameike Software Co ltd
Priority date: 2008-10-13
Filing date: 2008-10-13
Publication date: 2010-06-09

Abstract

The invention discloses a multi-point correcting method for bidirectional printing ink drop offset of a broad width ink jet printer, which specifically comprises the following steps: selecting a plurality of correction points on a printing medium at intervals, performing conventional single-point correction for each point respectively to acquire a bidirectional printing correction value of each correction point, establishing a coordinate graph by using a horizontal ordinate to express the length of a printing platform and using a vertical coordinate to express the amplitude of the correction value, connecting every two adjacent correction value points by using a straight line in the coordinate graph to acquire a correction value fold line covering the overall length of the printing medium, and correcting the operations of a printing spray head in the overall length range of the printing medium in a conventional mode according to a series of correction values acquired on the correction value fold line. Through multi-point correction in the overall length range of the printing medium, the influence of the self state of the printing platform to the printing quality is greatly reduced, the manual correcting workload is reduced, the correcting operation after the printer is arranged is simple, feasible and quick, the mounting cost is reduced, and the post maintenance for the printer is convenient.

Description

The multi-point correcting method of bidirectional printing ink drop offset of broad width ink jet printer

Technical field

The present invention relates to a kind of bearing calibration of broad width ink jet printer bi-directional printing, relate to a kind of multi-point correcting method of bidirectional printing ink drop offset of broad width ink jet printer specifically.

Background technology

Ink-jet printer is in overall print process, and shower nozzle moves in the horizontal direction, after shower nozzle enters print area, shower nozzle with ink droplet jet to print media.Because shower nozzle moves in the horizontal direction always, under effect of inertia, ink droplet still keeps the speed of the horizontal direction identical with shower nozzle after leaving the shower nozzle hole, that is to say that the ink jet process ink droplet is with the parabolic whereabouts, rather than with the form of straight lines vertical drop.There is a field offset amount position that will cause position that ink droplet begins to fall and ink droplet to drop on the print media like this.As shown in Figure 1, printing head is at B point ejection ink droplet, and when dextrad is printed, ink droplet will drop on the b1 point on the print media; When left-hand is printed, ink droplet then will drop on the b2 point on the print media, the side-play amount of ink droplet when the spacing between 2 of b1, the b2 is bi-directional printing.When bi-directional printing, the same point data of the two-way ejection of printing head all will can not drop on the same grid of print media, cause printing distortion.

The correcting mode of present ink-jet printer bidirectional printing ink drop offset is single point correction normally, promptly on print media, select bidirectional correcting figure of a dot printing, from figure, obtain corrected value, and the side-play amount of printing head data in the print media scope is adjusted according to this corrected value.Wherein, corrected value usually with a pixel as digit, corrected value is 1, the expression side-play amount correction value be a pixel, corrected value is 2, the correction value of then representing side-play amount is 2 pixels, or the like.Conventional bi-directional printing correction chart as shown in Figure 2, as can be seen from the figure,-2 pixel columns in the left-hand print pixel group align with-2 pixel columns in the dextrad print pixel group, the side-play amount b1b2 that printer ink droplet in the bi-directional printing process is described is 2 pixels, like this, as long as in the left-hand print procedure, give the side-play amount of print data, shower nozzle is dropped on the same grid of print media at the ink droplet of grating same position ejection in 2 pixels in the position of grating.

To ink-jet printer, shorter because of its print platform, crudy guarantees easily for general small capacity double, after the installation, the spacing of print platform in length range and between the printing head can be consistent substantially, thereby, only can guarantee print quality by single point correction.

Though and carry out single point correction during existing broad width ink jet printer bi-directional printing equally, but because its print platform is very long, though be because of the machining accuracy problem, or the transportation reason, or because of the installation accuracy problem, print platform after the installation is difficult to accomplish that the distance in length range and between the printing head is consistent, and in a single day deviation appears, will cause the printing distortion.With reference to Fig. 3, the B point that printer is chosen on the print platform among the figure carries out single point correction, in the print procedure when printing head runs to A point and C point, because the two is compared apart from the distance of print platform with the B point apart from the distance of print platform and has deviation, at this moment, printing head at the ink droplet of the two-way ejection of a point with the a0 point and the a1 point that drop on respectively on the print media, with the c0 point and the c1 point that drop on respectively on the print media, a point and c point place produce and print distortion on print media thus at the ink droplet of the two-way ejection of c point.Therefore, broad width ink jet printer for bi-directional printing before carrying out single point correction, must at first utilize high-precision rectifying an instrument that print platform is proofreaied and correct by the professional and technical personnel, so that its distance in length range and between the printing head is consistent, and then after carrying out conventional single point correction, could drop into normal the use.

Because the print platform of broad width ink jet printer is often long, as 2 meters, 3 meters, 5 meters, therefore, when print platform is carried out manual synchronizing, not only require operating personnel to have superb technical ability, but also to be equipped with high-precision professional instrument, nonetheless, still need a few hours, one day in addition the longer time just can finish.This correcting mode that manually adds single point correction when having the broad width ink jet printer bi-directional printing now, not only need spend lot of manpower and material resources at fixing link, and having influenced coming into operation as early as possible of equipment, the later maintenance and the maintenance of returning equipment simultaneously cause difficulty.

Summary of the invention

At the problem that prior art exists, the object of the present invention is to provide a kind of easy and simple to handle, proofread and correct the multi-point correcting method of quick, accurate broad width ink jet printer bi-directional printing.

For achieving the above object, the multi-point correcting method of a kind of bidirectional printing ink drop offset of broad width ink jet printer of the present invention, be specially: on print media, get several check points at interval, each point is carried out conventional single point correction respectively, obtain the bi-directional printing corrected value of each check point, the length of representing print platform with abscissa, represent that with ordinate the size of corrected value sets up coordinate diagram, in coordinate diagram, utilize straight line that two adjacent in twos corrected value points are linked to each other, obtain the corrected value broken line of a covering print media total length, in the print media length range work of printing head is proofreaied and correct in the usual way according to a series of corrected values that obtain from the corrected value broken line.

Further, described several check points distribute along any spacing of print media length direction.

Further, when utilizing described corrected value broken line to obtain corrected value, with 1 or be the differential value of carrying out less than 1 pixel value, if the bidirectional correcting value between two check points greater than 0, then realizes by the differential pixel that the data correspondence between two check points is got in the skew of the position of grating in the left-hand print procedure; If the bidirectional correcting value between two check points less than 0, then realizes by the differential pixel that the data correspondence between two check points is got in the skew of the position of grating in the dextrad print procedure.

The present invention proofreaies and correct by the print media length range being carried out multiple spot, strengthened from the degree of protection of controlling party in the face of print quality, greatly reduced the print platform oneself state to printing the susceptibility of quality influence, significantly reduced the manual synchronizing workload of print platform, correction work after printer is installed is simple, easy row, quick, reduce installation cost, made things convenient for the later maintenance of printer.Adopt bearing calibration of the present invention, the side-play amount of bidirectional printing ink drop can be controlled in 0.5 pixel coverage, printing for the high-quality of printer provides technical guarantee.

Description of drawings

Fig. 1 is the whereabouts schematic diagram of the ink droplet of two-way ejection;

Fig. 2 is existing single-point bi-directional printing correction chart;

Fig. 3 is at the print media whereabouts schematic diagram of the ink droplet of two-way ejection under the level state not;

Fig. 4 is for implementing bearing calibration schematic diagram of the present invention;

Fig. 5 is for to implement the resulting multiple spot correction chart of the inventive method by Fig. 4;

Fig. 6 is for utilizing the resulting corrected value broken line of Fig. 4 multiple spot correction chart coordinate diagram;

Fig. 7 handles the resulting broken line graph in back for Fig. 5 corrected value broken line there being level.

The specific embodiment

Specify the multi-point correcting method of broad width ink jet printer bi-directional printing of the present invention below in conjunction with accompanying drawing.

When implementing multi-point correcting method of the present invention, at first, as shown in Figure 4, choose 4 check point S1, S2, S3, S4 at interval along printer prints land lengths direction, print conventional bidirectional correcting figure respectively at 4 points, obtain 4 single-point bi-directional printing correction charts shown in Fig. 5, short-term is that the long line of primary colours is a correcting colour, left-hand is printed primary colours dextrad and is printed correcting colour, and obtains the corrected value of 4 points from figure, wherein, the corrected value of S1 is-1, the corrected value of S2 is-4, and the corrected value of S3 is-2, and the corrected value of S4 is-3; Then, as shown in Figure 6, with abscissa X represent print platform length, represent that with ordinate Y the size of corrected value sets up coordinate diagram, in coordinate diagram, utilize straight line that the corrected value point of S1, S2, S3, S4 is linked to each other, to be positioned at the corrected value point horizontal-extending laterally respectively of S1, the S4 at two ends simultaneously at 2, and obtain one thus and cover the corrected value broken line of print media from an end D to other end E total length; With a pixel is differential, and whether the corrected value of checking two check points, then no longer deals with if smaller or equal to 1 greater than 1; If greater than 1, then between two check points, make even interpolation, the interpolation between two check points is smaller or equal to 1.In the present embodiment, the corrected value difference between S1 and S2 two check points is 3 greater than 1, then evenly inserts two check point S5 and S6 between S1 and S2 two check points, and the corrected value of these two check points is respectively-2 pixels and-3 pixels; In like manner, the corrected value difference between S2 and S3 two check points is 2 greater than 1, evenly inserts a check point S7 between S2 and S3 two check points, and the corrected value of this point is-3 pixels; Correction difference between S3 and S4 two check points equals 1, does not then need to remake interpolation.So just obtained S1, S5, S6, S2, S7, S3, these 7 bidirectional correcting points of S4, the corrected value of these seven check points is respectively-1,-1,-1,-1, + 1, + 1 and-1, according to the bidirectional correcting value, in the left-hand print procedure, give between S1 and the S5, between S5 and the S6, between S6 and the S2, the skew of a pixel is done in the position of print data between S3 and the S4 on grating, in the dextrad print procedure, between S2 and S7, the skew of a pixel is done in the position of print data between S7 and the S3 on grating, and the data of the two-way ejection same point of ink-jet printer are dropped on the same grid of print media.

4 check point S1, S2, S3, S4 in the foregoing description are picked at random, when implementing the inventive method, the quantity of the check point of choosing can be more, selected a plurality of check points both can equidistantly be arranged along the print media length direction, also spacing is arranged arbitrarily, and the check point at two ends also can be arranged on the two ends of print media.

In addition, when the corrected value broken line is carried out classification and handles, except can a pixel as differential, also can select for use less than a pixel scale as differential, can further improve print quality like this.

Claims

1. method of proofreading and correct the ink-jet printer bidirectional printing ink drop offset, be specially: on print media, get several check points at interval, each point is carried out conventional single point correction respectively, obtain the bi-directional printing corrected value of each check point, the length of representing print platform with abscissa, represent that with ordinate the size of corrected value sets up coordinate diagram, in coordinate diagram, utilize straight line that two adjacent in twos corrected value points are linked to each other, obtain the corrected value broken line of a covering print media total length, in the print media length range work of printing head is proofreaied and correct in the usual way according to a series of corrected values that obtain from the corrected value broken line.

2. a kind of method of proofreading and correct the ink-jet printer bidirectional printing ink drop offset as claimed in claim 1 is characterized in that, described several check points distribute along any spacing of print media length direction.

3. a kind of method of proofreading and correct the ink-jet printer bidirectional printing ink drop offset as claimed in claim 1, it is characterized in that, when utilizing described corrected value broken line to obtain corrected value, with 1 or be the differential value of carrying out less than 1 pixel value, if the bidirectional correcting value between two check points greater than 0, then realizes by the differential pixel that the data correspondence between two check points is got in the skew of the position of grating in the left-hand print procedure; If the bidirectional correcting value between two check points less than 0, then realizes by the differential pixel that the data correspondence between two check points is got in the skew of the position of grating in the dextrad print procedure.