KR20110061275A - Bi-print compensation method of inkjet printer - Google Patents

Abstract

PURPOSE: A method of correcting the bidirectional printing of an inkjet printer is provided to enable more accurate printing generally since the order of one printing array is opposite to another printing array. CONSTITUTION: A method of correcting the bidirectional printing of an inkjet printer is as follows. A printing nozzle(8) moves from one side to the other side in the transversal direction of a target(3). When 1 pass printing is performed, the distance between dots is set to an a and b, which is different from the a. After a is repeated n times, b, which is different from the a, is established one time. A print array is set so that process of repeating the a n times and establishing the b one time can be repeated. After the 1 pass printing, the printing nozzle moves in the opposite direction to the 1 pass printing direction. When the two pass printing is performed, the printing array is set in the opposite order to the printing array of the 1 pass so that a or b between dots is established to be equal in the longitudinal direction of the target.

Description

Bi-print compensation method of inkjet printer

TECHNICAL FIELD The present invention relates to a printing correction method for a large inkjet printer device used for industrial use and the like.

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

Among the large printers, there are a roll providing method and a plane fixing method according to a method of supplying a printing object. In the flat fixing method, the print head unit is moved to the printing surface of the printing object while the printing object is set on the upper part of the stage. Configured to effect printing.

The large-size inkjet printer of the planar fixing method is configured to print a large advertisement board, a banner or the like. As a printing target of such a printer, various materials can be printed from general papers, sheet-like structures such as vinyl, PVC, and silk, and plate-like structures such as wood, glass, stone, and metal.

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

The print head unit 7 is provided with a plurality of print nozzles 8 for ejecting ink. Usually, printing is performed while selectively spraying ink such as C (Cyan: blue), M (Magenta: red), Y (Yellow: yellow), and K (black: black) color.

Each printing nozzle 8 is configured to eject ink of one color, and the number of injection holes is formed differently according to the resolution to be implemented, that is, dots per inch (dpi). In the case of 720dpi, it has an injection structure capable of forming 720 dots within 1 inch.

On the other hand, the print head unit 7 is provided with an encoder 9 for detecting the movement position of the print head unit 7 so as to detect the print position of the print nozzle (8). Usually, the encoder 9 is generally provided long in the X-axis direction to the printer head unit 7.

Typically, the ink jetting unit for realizing a specific resolution while the printing nozzle 8 jets ink uses an inch unit, and the head position (or the position of the ink nozzle) using the encoder 9 is a unit of m. I use it. At this time, the encoder 9 is generally configured to be able to detect up to 1um unit.

Since the ink jet unit and the head position unit are different from each other, the distance between each dot is corrected and controlled during actual printing. That is, when printing at 720 dpi, the interval between dots is 0.0352777 because 1 inch is 25.4 mm. mm (35.2777 um). The interval between each dot is 35.2777... Since um must be calculated to a decimal point of 1 um or less, it is difficult to accurately convert and control the encoder 9. Thus, for example, as shown in 2, the interval between dots is 35um, 35um, 35um, 36um... Printing is performed in a state in which ink jetting units per dot are continuously set (this is called a 'printing array'). Where the 35um spacing is 35.2777... After the decimal point is accumulated several times in um, a correction is made by setting the interval to 36um.

However, in the state where the print array is set as described above, when bidirectional printing is performed, that is, when one-pass printing is performed from left to right and then two-pass printing is performed from right to left, as shown in FIG. Since printing proceeds in the order of 1-pass printing as it is, it is possible to print more precisely and precisely because the printing position is different between two paths, for example, the interval of 36um is positioned differently in two upper and lower paths. There is a problem that limits arise in improving quality.

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

The present invention has been made to solve the above problems, when printing in one direction and then printing in the other direction, by controlling to print by setting the print array symmetrically around the print array in one direction and the print direction line An object of the present invention is to provide a bidirectional printing calibration method of an inkjet printer, which enables more accurate and precise printing to ensure excellent print quality.

In the bidirectional printing correction method of the inkjet printer according to the present invention for realizing the above object, when performing a one-pass printing while moving the print nozzle from one side to the other side in the transverse direction of the print object, between each dot (dot) between the dots (dot) Set the distance to a and b greater than or equal to a, repeat a for n times, set b greater than or equal to a once, then repeat a for n times, and set b once A print array is set to print continuously and repeating the process, and after the one-pass printing, when the two-pass printing is performed while moving the print nozzle in the direction opposite to the one-pass printing direction, Controlling two-pass printing to proceed with the print array set in the order opposite to the setting order of the one-pass print array so that the distance a or b between dots is set equally It is characterized by.

The pass after the second pass is preferably repeated by repeating the print array of the first pass and the second pass.

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

The bidirectional printing correction method of the inkjet printer according to the present invention, when printing in one direction and then printed in the other direction, because the control to set the print array in the reverse order of the print array in one direction to control the printing, as a whole more By providing accurate and precise printing, it is possible to provide more effective print quality.

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

3 is a perspective view illustrating an inkjet printer capable of implementing a printing correction method according to the present invention, and FIG. 4 is a reference diagram for explaining a bidirectional printing correction method according to the present invention.

The inkjet printers illustrated in these figures illustrate an inkjet printer of a planar fixing method, but are not limited thereto and may be applied to other types of inkjet printers such as a roll providing method. Hereinafter, a description will be given of the inkjet printer of the planar fixing method.

The inkjet printer illustrated in FIG. 3 includes a stage 10 configured to fix a printing object 15 thereon, a head support 20 mounted to the stage 10 to be movable in the Y-axis direction, A print head unit 30 mounted on the head support 20 so as to be movable in the X-axis direction and equipped with print nozzles 31 for printing a print object, and outputting a print signal according to an input image; It comprises a printer control unit 50.

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

First, as shown in FIG. 3, the stage 10 may be formed to have a quadrangular plane as a whole so that the print object 15 may be placed on the upper surface, and may fix the position by absorbing the print object 15. It is desirable to have a suction function so as to form a negative pressure.

In addition, the stage 10 may be provided with a Y-axis guide 12 for guiding the movement of the head support 20 in the Y-axis direction.

The configuration of the stage 10 can be variously configured by using or combining the configuration of a well-known planar fixed type industrial printer according to the implementation conditions.

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

Here, the both side support 21 or the stage 10 is provided with a drive unit to move the head support 20 in the Y-axis direction with respect to the stage. In FIG. 3, reference numeral 25 denotes a nozzle groove provided on both support members 21 to clean the print nozzles 31 while the print head unit 30 is moved.

The horizontal support 23 is provided with a linear motion (LM) guide to move the print head unit 30 in the X-axis direction, the LM guide can be appropriately configured using a known configuration so that the detailed description Omit. In Fig. 3, reference numeral 27 denotes an X-axis guide.

In addition, reference numeral 40 denotes an encoder provided in the horizontal support 23 of the head support 20. The encoder 40 is a device for detecting the moving position of the printer head unit 20. The head position unit detected by the encoder 40 is preferably to use the m unit system, it is preferably configured to detect up to 1um unit.

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

The head body 35 is provided with a plurality of print nozzles 31, the print nozzles 31 are four colors, C (Cyan: blue), M (Magenta: red), Y (Yellow: yellow), It may be arranged so that ink such as K (black) is ejected. Although the drawings illustrate a structure in which four print nozzles for discharging four colors of C, M, Y, and K are disposed, the present invention is not limited thereto, and an inkjet printer having four or less color or number of print nozzles is provided. Of course, the same can be applied to.

As described in the background of the present specification, the printing nozzles 31 are formed differently according to the resolution to be implemented, that is, dots per inch (dpi). In the case of 720dpi, it has an injection structure capable of forming 720 dots within 1 inch.

In an inkjet printer having such a structure, a bidirectional printing correction method of the inkjet printer will be described.

Bidirectional printing proceeds with one-pass printing while moving the print nozzle 31 from left to right in the lateral direction of the print object 15, and conversely, two-pass printing while moving the print nozzle 31 from right to left. It is a printing method. Of course, in contrast to the above, it is also possible to proceed with 1-pass and 2-pass printing, and the printing after 3 passes and 4 passes is made by the method in which the print directions of 1 pass and 2 pass are repeated.

When the bidirectional printing is performed, the ink ejection unit (inch) and the head position unit (m) are different from each other, and thus, during actual printing, output control is performed by correcting the distance between each dot.

In the correction output method, when printing one pass, the distance between each dot is set to a or b, and after repeating a n times, the distance between dots is set to b larger or smaller than a. After setting once, a print array is set and printed so that it can print while repeating the process of repeating a to n times and b to set once.

For example, when printing at 720 dpi, the interval between each dot is exactly 0.0352777... mm (35.2777 ... um), for conversion (compatibility) control with the encoder 40, if a is set to 35um and b to 36um, the interval between dots is set to 35um, 35um, 35um, as shown in FIG. 36 um. A print array in which ink ejection units are continuously set per dot is sequentially set, the print head unit 20 is moved according to the print array, and printing is performed while being sensed by the encoder 40. Where the 35um spacing is 35.2777... The um is subtracted from the decimal point, and the numerical value after the decimal point is accumulated by several times (n times), and then corrected by adding up and solving in the 36 um interval. At this time, it is preferable to ignore some numerical values below the decimal point and to apply.

When one-pass printing is performed with the print array set as described above, when bidirectional printing is performed, an error occurs between adjacent paths, so that accurate printing is difficult. To solve this problem, after one-pass printing, the print nozzles are reversed. When two-pass printing is performed while moving (31), printing is performed by setting a two-pass printing array in the reverse order of the one-pass printing array. That is, the two-pass print array is controlled so that printing can proceed in a state set opposite to the setting of the one-pass print array in the printing direction. At this time, the distance a or b between dots is equally located in the longitudinal direction of the print object.

For example, in case of printing at 720 dpi, for example, in contrast to 1-pass printing, 2-pass printing is performed while the print nozzle 31 moves from right to left, as shown in FIG. 4. in reverse order of dot spacing, 36um 35um, 35um, 35um... Prints in order of 35um, 36um, 35um, 35um, 35um. Of course, the pass printing after the 3 pass and the 4 pass is also performed by repeating the 1 pass print array and the 2 pass print array, and the dot section is set to have the same dot spacing in the vertical direction in the vertical pass.

The embodiment described using the specific numerical value is just one example, and in the bidirectional printing control method including reverse printing as described above, the printing array is set to be controlled so that the dot spacing between the upper and lower passes is the same. As a result, the printing of the image to be printed as a whole becomes more precise and accurate, and the improvement of the print quality can be expected.

As described above, the technical ideas described in the embodiments of the present invention can be performed independently of each other, and can be implemented in combination with each other. In addition, the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, which is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and equivalent other embodiments therefrom It is possible. Accordingly, the technical scope of the present invention should be determined by the appended claims.

1 is a perspective view of a conventional inkjet printer,

2 is a reference diagram showing a bidirectional printing method of a conventional inkjet printer,

3 is a perspective view of an inkjet printer for implementing a bidirectional printing correction method according to the present invention;

4 is a reference diagram for explaining a bidirectional printing correction method of an inkjet printer according to the present invention.

Claims (2)

When 1-pass printing is performed while moving the print nozzle from one side to the other side in the transverse direction of the print object, set the distance between each dot to a and b greater than or less than a, and repeat a a n times. After that, after setting b greater than or less than a once, the print array is set to print continuously repeating the process of n a time and b one time. After the one-pass printing, when the two-pass printing is performed while moving the print nozzle in the direction opposite to the one-pass printing direction, one pass so that the distance a or b between each dot is set equal in the longitudinal direction of the print object. And controlling to allow two-pass printing to proceed in a state in which the print array is set in an order opposite to the setting order of the print array of the ink array printer. The method according to claim 1, And the second pass after the second pass repeats the printing array of the first pass and the second pass.

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