JPH1158717A - Color ink jet textile printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly execute a color changing operation by providing ink heads corresponding to twelve colors obtained by regulating six colors obtained by adding orange and royal blue to basic four colors of three primary colors and black to dark and light colors, thereby forming a sharp pattern with color expression of a wide range. SOLUTION: A cloth 21 is taken up on a take-up drum 23 between a rate control roller pair 22, and sent in a predetermined tensioned state at a predetermined velocity in an X direction. A traverser 24 reciprocating in a Y direction perpendicular to an X direction is provided near the cloth 21 above the cloth 21 between the roller pair 21 and the roller 23, and twelve ink heads 25 are disposed. Twelve colors obtained by adding royal blue and orange and their light colors to yellow, cyan, magenta and black and their light colors are allocated to the twelve heads 25. And, the cloth 21 is textile printed. Color range impossible to be expressed by the basic four colors can be expressed. In the case of color changing, rapid stage replacement can be executed. Since ink droplets are not superposed, its adhering amounts are small. And, a sharp pattern can be textile printed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color ink jet printing apparatus for printing a multicolor pattern on a cloth, and more particularly to a color ink jet printing apparatus capable of expressing a wide range of colors.

[0002]

2. Description of the Related Art When a multicolor pattern is printed on paper using a color ink-jet printer, four colors (hereinafter referred to as "basic four colors") in which black is added to three primary colors of yellow, magenta and cyan.
Color. " ) Can express a wide range of colors (brightness, saturation, hue). On the other hand, when a multi-color pattern is printed on a fabric made of fibers using an ink jet printing apparatus having four basic colors, the range that can be expressed by the four basic colors is yellow 1, magenta 2 and cyan 3 in FIG. Limited to the enclosed area.

[0003] However, the colors used in clothing and the like are diverse, and if there is a color range that cannot be expressed by an ink jet printing apparatus, the function is inferior to a screen printing machine, a roller printing machine, and a rotary printing machine. There is.

Accordingly, a color ink jet printing method has been proposed in which one or more different colors are added to the four basic colors so that a wide range of hues can be expressed (for example, Japanese Patent Application Laid-Open No. 6-5 / 95).
7654, JP-A-8-226083). The method of Japanese Patent Application Laid-Open No. Hei 6-57654 (first conventional method) is to add a total of five or more colors by adding one or more dyes from orange, violet and green in addition to the basic four colors according to the hue. The method disclosed in Japanese Patent Application Laid-Open No. H8-226083 (second conventional method) is based on a hue from 12 colors of ink obtained by adding fluorescent yellow, fluorescent pink, vivid blue, and vivid violet to four basic colors of dark and light. 3 per dot
The color is also given.

[0005]

However, in the first conventional method, it is necessary to select the type of color to be added and the position of the ink head when the color of the pattern is changed. It is necessary to adjust the injection position and timing of the nozzle, and there is a problem that the setup work is troublesome. Also,
In the second conventional method, it is necessary to superimpose ink droplets of up to three colors on the same position, it is necessary to increase the accuracy of the ejection position of the ink droplet, and the amount of ink droplet of one dot increases. There is a problem that the steaming heat treatment time of the cloth after printing must be lengthened, and it becomes difficult to form a sharp pattern due to diffusion of the dye.

The present invention provides an ink jet printing apparatus capable of expressing a wide range of colors, forming a sharp pattern with a small amount of ink droplets attached, and performing a color changing operation smoothly. The task is to provide.

[0007]

According to the first aspect of the present invention, there is provided an ink-jet printing apparatus comprising three printing units of yellow, magenta and cyan.
Twelve ink heads 25 corresponding to each of a total of twelve colors, each of which is prepared by shading six colors obtained by adding orange and royal blue to four basic colors consisting of primary colors and black.
a to 25 l. The ink is prepared from a reactive dye, an acid dye, a disperse dye, a direct dye and a cationic dye.

According to a second aspect of the present invention, a dark color used in the ink jet printing apparatus according to the first aspect is specified by CIE1976 chromaticness indices a * and b *. A * of dark yellow 1 is -8.72, b * is 86.45, a * of dark magenta 2 is 65.69, b * is 17.92, a * of dark cyan 3 is -36.20, b * is -27.47. A * of dark black 4 is -1.47, b * is -5.87, dark orange 5
A * is 57.80 and b * is 65.76. Dark Royal Blue 6 has a * of 5.67 and b * of -42.65.

[0009]

According to the ink jet printing apparatus of the first aspect, the ink heads 25a-2 corresponding to each of the six dark colors 1-6 including orange and royal blue in addition to the four basic colors.
Since 5f is permanently provided, a color range that cannot be expressed by the four basic colors, that is, reddish blue, orange, and purple colors with high saturation can be expressed. Further, even if the color of the pattern is changed, it is not necessary to change the type of the color or the position of the ink head, so that the setup can be changed quickly. Furthermore, since the ink droplets are not applied repeatedly, a sharp pattern can be printed with a small amount of ink attached. In addition, light color 7-1
Since the ink heads 25g to 25l corresponding to the respective colors of 2 are permanently provided, there is no possibility that the dots become coarse even in a light color, and a high-quality printed fabric rich in shading can be obtained.

In the ink jet printing apparatus according to the second aspect, since the CIE 1976 chromaticness indices a * and b * use dark colors 1 to 6 having predetermined values, a high saturation orange range A and a reddish blue range B are used. And the range C of purple can be expressed, and the range of colors required for printing of clothing and the like can be completely included.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The following six reactive dyes are prepared into dark and light inks, respectively, printed on cotton fabric, dried, steamed, washed with water and dried to obtain the color of the cotton fabric pattern as a light source D65.
(10 degrees) It measured using the colorimeter MacbethCE-3000. Yellow CIReactive Yellow 95 Magenta CIReactive Red 24 Cyan CIReactive Blue 72 Black CIReactive Black 8 Orange CIReactive Orange 13 Royal Blue CIReactive Blue 49

FIGS. 2 and 3 show the measurement results in CIE1976. FIG. 2 shows the dark colors of deep yellow 1, dark magenta 2, dark cyan 3, dark black 4, dark orange 5, and dark royal blue 6, and FIG.
The light colors of light magenta 8, light cyan 9, light black 10, light orange 11, and light royal blue 12 are displayed. In the figure, L * is the lightness index of CIE1976, and a * and b * are the chromaticness indexes of CIE1976. Note that 12
Specific numerical values of L *, a *, and b * of the colors are shown in Table 1.

[0013]

[Table 1] L * a * b * Dark yellow 90.32 -8.72 86.45 Dark magenta 45.97 65.69 17.92 Dark cyan 55.07 -36.20 -27.47 Dark black 24.07 -1.47 -5.87 Dark orange 61.27 57.80 65.76 Dark royal blue 39.15 5.67 -42.65 Light yellow 95.04 -3.81 11.83 Light magenta 89.88 10.89 -1.03 Light cyan 93.82 -5.05 -0.10 Light black 87.55 -1.99 -0.87 Light orange 89.66 12.13 10.27 Light royal blue 82.77 -0.67 -11.15

FIG. 1 shows the range of colors that can be expressed on a cotton fabric by the inks shown in Table 1. An area surrounded by dark yellow 1, dark magenta 2 and dark cyan 3 is a range of colors that can be expressed by the four basic colors, and dark black 4 is located at a position where the coordinate axes are orthogonal. Shaded area A is basic 4
The shaded area B is a range that can be expressed by adding dark orange 5 to the color, the shaded area B is a range that can be expressed by adding dark royal blue 6 to the basic four colors, and the shaded area C is a shaded area that can be expressed by adding the dark four. It is a range that can be expressed by adding orange 5 and dark royal blue 6.

Next, a printing method using the ink jet printing apparatus of the present invention will be described with reference to FIG. The cloth 21 is wound around a winding drum 23 through a space between a pair of rate-limiting rollers 22 whose rotation speed is controlled by a servomotor. The take-up drum 23 is driven by a torque motor, and applies a constant tension to the cloth 21 whose feed speed is restricted by the pair of rate-limiting rollers 22. That is, the cloth 21
Is sent at a constant speed in the direction of arrow X while being pulled with a constant tension between the pair of rate-limiting rollers 22 and the winding drum 23. A groove and a ridge that mesh with each other are provided on the peripheral surface of the pair of rate-limiting rollers 22, and the cloth 21 is bitten between the groove and the ridge to prevent the cloth from slipping.

Above the cloth 21 between the pair of rate-limiting rollers 22 and the winding drum 23, there is provided a traverser 24 which reciprocates in the direction Y orthogonal to the cloth feeding direction X in the vicinity of the cloth 21. 12 ink heads 2 on the traverser
5 (25a to 25l) are arranged. Traverser 2
4 is connected to a belt reciprocally driven by a servo motor (not shown), and reciprocates along a guide 26 in the direction of arrow Y in the figure.

FIGS. 5A to 5C show examples of the arrangement of the twelve ink heads 25a to 25l on the traverser 24.
An example is shown below. The twelve ink heads 25a to 25l are arranged in one or two rows on the traverser 24 and are obliquely arranged in a plan view with respect to the cloth feeding direction X. FIG. 5 (a) shows the arrangement in one row, FIG. 5 (b) shows the arrangement of two rows and the first and second rows are arranged in a staggered manner, and FIG. 5 (c) shows two rows. The first row and the second row are arranged on the same line in the fabric feeding direction. The arrangement in FIG. 5C can minimize the arrangement width of the ink head. Reducing the arrangement width of the ink head is effective in shortening the traveling stroke of the traverser and performing high-speed printing.

FIG. 6 is a block diagram of the entire control device.
An image processing device 32 is connected to a bus (bus) 31 of the control device via an interface. The design signal to be printed is given from the image processing device 32 to the control device.
The control device 33 includes a hard disk device 34 for storing control programs and symbol information, a floppy disk device 35 for data input / output, and a liquid crystal panel 3 for symbol confirmation.
6. The control touch panel 37 is connected via an interface circuit, and includes an arithmetic CPU 29 and a main memory 30.

Further, to the bus 31 of the control device, a servo motor 39 for feeding cloth and an encoder 40 for detecting the rotation speed thereof are connected via an interface circuit and a servo amplifier 38. Via a servo amplifier 41, a reciprocating drive motor 42 of the traverser and an encoder 43 for detecting its rotation are connected. Further, twelve ink heads 25 (25a to 25l) are connected to the bus 31 via an interface circuit, a main body side control circuit 44, and ink head side control circuits 45a to 45l.

Each of the ink head side control circuits 45 is provided with a shift circuit 46 and a delay circuit 47 as shown in FIG. 7, and these circuits are provided with a shift amount setting unit 48 and a delay amount setting unit 49. Comes with.
The set values of these setting devices are input from the touch panel 37 while the control device is in the setting mode, and are set in the setting devices 48 and 49 of each ink head side control circuit.

The ink heads 25a to 25l are provided with a large number (for example, 56) of nozzle holes arranged in a straight line or in a staggered manner in the fabric feeding direction. An ink ejection pattern signal d for a smaller number (for example, 48) of nozzle holes is provided. This ink ejection pattern signal d is
Basically, the ejection of the nozzle holes excluding a predetermined number (for example, four at both ends) of both sides of a large number of nozzle holes is controlled. The ejection pattern signal d is a combination of on / off signals corresponding to the number of nozzle holes in the decoder 50, but signals for a predetermined number of nozzle holes at both ends are always off.
The on / off signal passes through the shift register 51, and is shifted forward or backward by the number set in the shift amount setting unit 48 in the feeding direction of the cloth.

On the other hand, the timing signal y for ink ejection is given from the control device main body side to each ink head, and is set by the delay amount setting device of the ink head side control circuit in the delay circuit 47 for each ink head. The delay is given to the gate circuit 52 by a time interval, and the gate circuit ejects ink from the ink head at the timing when the pulse is given from the delay circuit. FIG. 7
Shows only one delay circuit, the traverser 24
It is common that ink is ejected both in the forward path and the return path. In this case, two delay means, a delay circuit for the forward path and a delay circuit for the return path, are provided.

With the above configuration, the shift amount setting device 4 of the head-side control circuit provided for the twelve ink heads
By changing the setting value of 8, it is possible to adjust the dot positions of the ink droplets ejected from each ink head onto the fabric in the direction in which the fabric is fed. Further, by changing the set value of the delay amount setting device 49, the position of the dot in the traverser feed direction, that is, the direction perpendicular to the feed direction of the cloth can be finely adjusted.

Twelve ink heads of an ink-jet printing apparatus capable of finely adjusting the dot positions of the ink droplets ejected from each ink head on the fabric are provided in yellow, cyan, magenta, black and their light colors. In addition, royal blue and orange and a total of twelve of these light colors are assigned and printing of the fabric 21 is performed, so that the color of the wider and almost complete visible region can be changed without changing the basic colors of the twelve colors. It is possible to print accurately including the subtle color change.

[Brief description of the drawings]

FIG. 1 is a diagram showing a color range in CIE1976.

FIG. 2 is a diagram showing six dark colors displayed on CIE1976.

FIG. 3 is a diagram showing six light colors displayed on CIE1976.

FIG. 4 is a perspective view showing a relationship between a fabric and an ink head.

FIG. 5 is a plan view showing the arrangement of ink nozzles.

FIG. 6 is a block diagram of a main body control circuit.

FIG. 7 is a block diagram of a control circuit of the ink nozzle.

[Explanation of symbols]

 1 Dark Yellow 2 Dark Magenta 3 Dark Cyan 4 Dark Black 5 Dark Orange 6 Dark Royal Blue 7 Light Yellow 8 Light Magenta 9 Light Cyan 10 Light Black 11 Light Orange 12 Light Royal Blue 25 Ink Head

Claims (2)

[Claims] 1. A total of twelve ink heads corresponding to a total of twelve colors prepared by shading each of six colors obtained by adding orange and royal blue to three basic colors consisting of three primary colors of yellow, magenta and cyan, and black, and four colors of black. (25a-25
l) A color inkjet printing device equipped with: 2. The CIE1976 chromaticness index a * of dark yellow (1) is -8.72 and b * is 86.45, and the CIE1976 chromaticness index a * of dark magenta (2) is 65.6.
9, b * is 17.92, CIE1976 chromaticness index a * of dark cyan (3) is -36.20, b * is -27.47, and CIE1976 chromaticness index a * of dark black (4) is -1.47, b * Is -5.87, CIE1976 chromaticness index a * of dark orange (5) is 57.80, b * is
2. The color ink jet printing apparatus according to claim 1, wherein the CIE1976 chromaticness index a * of dark royal blue (6) is 5.67 and b * is -42.65.