JPH10100489A - Printer and printing position control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer and a printing position control method in which highly accurate printing can be performed at low cost by enhancing the feeding accuracy of an endless belt without employing an intricate and expensive digital servo control mechanism. SOLUTION: A mark A is printed at an end on the surface of a carrying belt 130 by a marking means 150 and the marked carrying belt 130 is moved by a predetermined distance L through belt carrying means 110, 120. Every time when the carrying belt 130 is moved, the mark A is detected by image pickup means 301 302, and the image data of detected mark A before and after movement are compared each other. shift in the movement of the carrying belt 130 is corrected based on the comparison results.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus and a printing position control method for patterning a pattern on a cloth surface such as a cloth with high precision.

[0002]

2. Description of the Related Art A conventional example of a control method for a printing apparatus is disclosed in, for example, Japanese Patent Publication No. Sho 60-31728. This device includes a belt 50 as shown in FIG.
Each of the pair of rollers 501 and 502 supporting 0 includes DC motors 503 and 504 as drive sources, pulse generators 505 and 506, and digital servo mechanisms 507 and 508.

In addition, two pulse generators 505,
Between the digital servo mechanism 506 and one of the digital servo mechanisms 507 and 508, the number of detection pulses from the pulse generator 505 of the pulling roller 501 and the feeding roller 50 are set.
2 is compared with the number of detected pulses from the pulse generator 506 and the DC motors 503 and 504 are
There is provided a deviation comparison counter 510 for correcting and controlling the input to the counter.

[0004]

In such a conventional example, the DC motors 503 and 504 and the pulse generators 505 and
06, the digital servo mechanisms 507 and 508 are installed, and the number of mechanisms and control methods of the apparatus are multiple and expensive. Further, the perimeter of the belt 500 adversely affects printing accuracy due to an error caused by a difference in the amount of elongation at the start and a difference in the amount of contraction when the belt 500 is stopped during intermittent feeding of the belt 500. .

Accordingly, an object of the present invention is to provide a cloth printing apparatus capable of performing low-cost, high-precision control by increasing the feeding accuracy of an endless belt without using a complicated and expensive digital servo control mechanism. And a printing position control method therefor.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a recording medium on a transport belt is moved to a predetermined position by intermittently feeding the transport belt by belt transport means, and a print head is used on the recording medium. A marking device for marking an alignment pattern on an end portion of the conveyor belt, a first imaging device for imaging the marked alignment pattern, and the first imaging device. First image storage means for storing the registration pattern captured by the means as data of a registered image, and the registration pattern on the transfer belt at a position where the transfer belt has been moved by a predetermined distance by the belt transfer means. A second image capturing unit that captures search information including a second image, and a second image that stores data of the search image captured by the second image capturing unit Storage means; movement deviation amount calculation means for comparing the data of the registered image with the data of the search image to calculate the movement deviation amount of the conveyor belt caused by the belt conveyance means; and the movement deviation amount calculation means And a moving amount correcting means for correcting the moving distance of the transport belt based on the moving deviation amount calculated by (1), thereby configuring the printing apparatus.

Further, according to the present invention, the recording medium on the transport belt is moved to a predetermined position by intermittently feeding the transport belt using a belt transport means, and printing is performed on the recording medium using a print head. It is a printing position control method for performing, mark a registration pattern on the end on the conveyor belt, detect the marked registration pattern,
The detected alignment pattern is stored as data of a registered image, and search information including the alignment pattern on the transport belt is detected by the belt transport unit at a position where the transport belt has moved by a fixed distance, The search information including the detected alignment pattern is stored as search image data, and the stored registered image data and search image data are compared to move the transport belt caused by the belt transport unit. A printing position control method is provided by calculating a shift amount and correcting the moving distance of the transport belt based on the calculated shift amount.

The following constituent requirements can be added. The displacement amount can be calculated by a normalized correlation operation between the data of the registered image and the data of the search image. Further, the correction can be made based on the relative displacement between the data of the registered image and the data of the search image.

In addition, it is possible to mark the alignment pattern using an ink jet head for discharging ink or dye, and discharge the ink or dye from a plurality of fine holes of the ink jet head toward the belt surface. it can. In this case, the inkjet head may be configured to generate bubbles in the ink or the dye using the Joule heat, and discharge the ink or the dye as the bubbles are generated.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

An ink jet printing apparatus will be described as an example of a fabric printing machine according to the present invention. First, a schematic configuration of the printing apparatus will be described with reference to FIG.

Here, reference numeral 1 denotes a cloth as a print medium. The cloth 1 is unwound in accordance with the rotation of the unwind roller 11 of the unwind section, and is substantially passed by the transport section 100 installed at a position facing the printer section 1000 via the intermediate rollers 13 and 15. After being transported horizontally,
Take-up roller 21 via feed rollers 17 and 19
It is wound up.

Here, the transport unit 100 generally includes a transport roller 110 which is a driven roller installed on the upstream side of the printer unit 1000 in the transport direction of the cloth 1 and a driving roller installed on the downstream side. A certain transport roller 120 and the transport belt 13 wound around the transport rollers 110 and 120
0, and a pair of platen rollers 140 installed to maintain the flatness by extending the transport belt 130 with a predetermined range of optimal tension in order to regulate the printing surface of the fabric flat when printing by the printer unit 1000. It is composed of

The transport belt 130 can be made of a non-metallic material such as reinforced rubber which is sufficiently durable, and has an adhesive layer formed on its surface. The fabric 1 is adhered to the transport belt 130 by the attaching roller 150, so that flatness during printing is ensured.

The registration pattern marked on the end of the conveyor belt 130 by the mark printer 160 is taken in as a registered image by the image processing apparatus 300 via the registered image industrial camera TV (ITV) 301. The alignment pattern marked on the conveyor belt 130 in this manner is taken in as a search image by the image processing apparatus 300 via the search image ITV camera 302 arranged at a predetermined interval, that is, a distance L between the optical axes. . In addition, a pair of auxiliary rollers 170 arranged so as to be in contact with the conveyor belt 130 is connected to each ITV camera 301,
It is arranged to substantially face 302.

The printing unit 1000 includes a carriage 10
The ink jet head 1020 fixed to the carriage 1010 performs printing on the cloth 1 at every optical axis distance L within the time of this movement.

As described above, the printing agent is applied by the printer unit 1000 in the area between the pair of platen rollers 140 to the cloth 1 conveyed in a state where the flatness is secured on the conveying belt 130, and conveyed. At the position of the roller 120, the printing agent is peeled off from the conveyor belt 130 or the adhesive layer, and the drying agent 500 dries the printing agent.
It is wound by a winding roller 21.

Next, a printing position control method according to the present invention will be described in detail with reference to FIGS.

In the flowchart of FIG. 3, first, an image processing apparatus 300 for controlling the entire sequence of the present apparatus.
The carriage 1010 returns to the home position (home position) for the next operation and receives an instruction from the host computer as the
The operation of recovering 0 is also executed (step S1).

The host computer 300 controls the transport belt 1
After confirming that the output pulses from the rotary encoders 121 and 111 connected to the respective drive mechanisms of the driving roller 120 and the driven roller 110 that drive the motor 30 have stopped, that is, that the transport belt 130 has stopped. After that, an alignment pattern is printed on the end of the conveyor belt 130 by the mark printer 150 (hereinafter, referred to as a marker) shown in FIG. 2 (step S2).

In the state where the transport belt 130 is stopped,
The registration pattern in the field of view is registered ITV3
01, and converts the captured image from an analog signal to a digital signal by an A / D converter 306 via a multiplexer 305.
11 and stored in the registered image memory 307, and
Coordinates representing the position of the alignment pattern in the captured image, for example, the center of gravity Ac of the alignment pattern
(Xa, Ya) is obtained (step S3).

Ia in FIG. 4A is an image near the alignment pattern captured by the registered image ITV camera 301. Also, Ia shown in FIG. 4A is stored in the registered image memory 307 as a registered image. Note that the origin of the image coordinate system is defined as (a) and (b) in FIG.
Is defined as (0,0).

Immediately after the completion of the above-described registration image reading, the conveyor belt 130 is accelerated / decelerated by the command of the host computer, and is moved to a position δ shorter than the target moving distance L and stopped (steps S4 and S5).

Next, at the stop position, an ITV camera 302 for a search image searches for a registration pattern in the field of view.
After the captured image is converted from an analog signal to a digital signal by an A / D converter 306 via a multiplexer 305, the image data bus 311
Is stored in the search image memory 308, and where the registered image Ia exists in the area of the search image Ib is
For example, a normalized correlation calculation is performed by the comparison calculator 309 based on the alignment mark vicinity data in FIG. 4B to obtain the coordinate value (Xb, Yb) when the normalized correlation value is the maximum (step S6). ).

Here, it is determined whether or not the difference in the amount of displacement between the registered image Ia and the search image Ib, that is, whether the absolute value of (Xa-Xb) is equal to or smaller than the allowable value Δδ pixels. If the shift amount is equal to or smaller than the allowable value Δδ pixel (step S7), it is determined that the stop position is normal, and the inkjet printer head 10
The printing agent is applied to the cloth 1 by the step 20 (step S10). On the other hand, if the deviation is positive and the absolute value is larger than the allowable value Δδ, that is, the target position T (Xt,
Yt), when the vehicle stops at the right side of FIG. 4B, the deviation amount is determined by the CPU 31 of the image processing apparatus 300.
At 0, the distance correction amount is calculated by converting the number of pulses of a rotary encoder connected to the driving side or driven side driving mechanism of the conveyor belt 130 (step S8).

Then, the distance correction amount obtained in this way is sent to the control device of the conveyor belt 130 via the communication cable 312 and moved downstream to correct the positional deviation (step S9). Further, the deviation amount is negative and the allowable value Δ
When the value is larger than δ, that is, the target position T (Xt, Y
Even when the vehicle passes through t) and stops from the left in FIG. 4B, the distance correction amount is obtained in the same manner, and the distance is corrected by moving to the upstream side. Then, Step S6 to Step S
The processing of No. 9 is repeated until the deviation amount becomes equal to or smaller than the allowable amount Δδ.

The above process is repeated each time the conveyor belt 130 is intermittently fed, and is moved to the position δ short of the target moving distance L and stopped every time, and the printing agent is applied to all the fabrics 1. This eliminates an error caused by a difference in the amount of expansion at the start and a difference in the amount of contraction when the belt is stopped at the time of intermittent feeding of the conveyor belt 130, and high-precision printing can be performed.

Next, the entire process of ink-jet textile printing will be described. Using the above-described inkjet recording device,
After the inkjet printing process, the fabric is dried (including natural drying). Subsequently, a step of diffusing the dye on the fabric fiber and reacting and fixing the dye to the fiber is performed. By this step, it is possible to obtain sufficient color-forming properties and fastness due to fixation of the dye.

This diffusion and reactive fixing step may be a conventionally known method, for example, a steaming method. In addition,
In this case, the fabric may be subjected to an alkali treatment before the printing step.

Thereafter, in a post-treatment step, unreacted dye is removed and substances used in the pre-treatment are removed.
Finally, the record is completed through an orderly finishing process such as defect correction and ironing.

In particular, as a fabric for ink-jet printing, (1) the ink can be colored to a sufficient concentration;
(2) high ink dyeing rate; (3) quick drying of the ink on the fabric; (4) less occurrence of irregular ink bleeding on the fabric; And high performance such as excellent transportability. In order to satisfy these required performances, in the present invention, the fabric can be subjected to a pretreatment beforehand, if necessary. For example, Japanese Patent Application Laid-Open No. 62-53492 discloses cloths having an ink receiving layer, and Japanese Patent Publication No. 3-46589 proposes a cloth containing a reduction inhibitor or an alkaline substance. I have. As an example of such a pretreatment, there can be mentioned a treatment in which a cloth contains a substance selected from an alkaline substance, a water-soluble polymer, a synthetic polymer, a water-soluble metal salt, urea and thiourea.

Examples of the alkaline substance include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide;
Examples thereof include amines such as mono-, di-, and triethanolamine, and alkali metal carbonates or bicarbonates such as sodium carbonate, potassium carbonate, and sodium bicarbonate. Furthermore, there are organic acid metal salts such as calcium acetate and barium acetate, ammonia and ammonia compounds. Further, sodium trichloroacetate which becomes an alkaline substance under steaming and dry heat may be used. Particularly preferred alkaline substances include sodium carbonate and sodium bicarbonate used for dyeing reactive dyes.

Examples of the water-soluble polymer include starch substances such as corn and wheat, cellulosic substances such as carboxymethylcellulose, methylcellulose and hydroxyethylcellulose, sodium alginate, gum arabic,
Locust bean gum, tragacanth gum, guar gum,
Examples include polysaccharides such as tamarind seeds, protein substances such as gelatin and casein, and natural water-soluble polymers such as tannin substances and lignin substances.

Examples of the synthetic polymer include polyvinyl alcohol compounds, polyethylene oxide compounds, acrylic acid-based water-soluble polymers, and maleic anhydride-based water-soluble polymers. Among them, polysaccharide polymers and cellulose polymers are preferable.

Examples of the water-soluble metal salt include compounds which form typical ionic crystals and have a pH of 4 to 10, such as halides of alkali metals and alkaline earth metals. Representative examples of such compounds include, for example, NaCl, Na ₂ S
O ₄ , KCl and CH ₃ COONa, and the like, and examples of the alkaline earth metal include CaCl ₂ and Mg
Cl _{2 and the} like. Among them, salts of Na, K and Ca are preferred.

The method of incorporating the above substances and the like into the fabric in the pretreatment is not particularly limited, and examples thereof include an ordinary dipping method, a pad method, a coating method, and a spray method.

Further, since the printing ink applied to the ink-jet printing cloth is merely adhered when applied to the cloth, it is necessary to carry out a fixing step of the dye or the like in the ink onto the fiber. Is preferred. Such a fixing step may be performed by a conventionally known method, for example, a steaming method, an HT steaming method, a thermofix method,
When a fabric which has been previously alkali-treated is not used, an alkali pad steam method, an alkali blotch steam method, an alkali shock method, an alkali cold fix method and the like can be mentioned. The fixing step may or may not include a reaction process depending on the dye. As an example of the latter, there is a method in which fibers are impregnated and do not physically separate. As the ink, any suitable ink can be used as long as it has a required pigment, and the ink is not limited to a dye and may include a pigment.

Further, the removal of unreacted dye and the substance used for the pretreatment can be carried out by washing after the above-mentioned reaction fixing step according to a conventionally known method. In addition, it is preferable to use a conventional fixing process in combination with this cleaning.

The printed material which has been subjected to the post-processing steps described above is then cut into a desired size, and the cut pieces are processed to obtain a final processed product such as sewing, bonding, welding, etc. Is applied to obtain clothes such as one-piece dresses, dresses, ties, and swimwear, duvet covers, sofa covers, handkerchiefs, curtains, and the like. A method of processing a fabric by sewing or the like to produce clothing or other daily necessities is a conventionally known technique.

Examples of the printing medium include textiles, wall cloths, threads used for embroidery, wallpaper, paper, OHP films, plate-like materials such as alumite, and other various types of liquids to which a predetermined liquid can be applied using ink jet technology. The cloth includes all woven fabrics, non-woven fabrics and other fabrics regardless of the material, weave or knitting.

The present invention is not limited to the above-described ink-jet printing method, and various printing methods can be adopted. In the case where the ink-jet printing method is used, among them, heat is used as energy used for performing ink ejection. An excellent effect is provided by using a method of generating a change in the state of the ink by the thermal energy, that is, a bubble jet type print head and printing apparatus proposed by Canon Inc. This is because such a method can achieve higher density and higher definition of the print.

The typical configuration and principle are described in, for example, US Pat. Nos. 4,723,129 and 4,740.
It is preferable to use the basic principle disclosed in the specification of Japanese Patent No. 796. This method is a so-called on-demand type,
Although it can be applied to any type of continuous type, in particular, in the case of the on-demand type, it can be applied to a sheet holding liquid (ink) or an electrothermal converter arranged corresponding to the liquid path. Applying at least one drive signal corresponding to the printing information and providing a rapid temperature rise exceeding nucleate boiling, causing the electrothermal transducer to generate thermal energy, causing film boiling on the heat-acting surface of the printhead. This is effective because bubbles can be formed in the liquid (ink) corresponding to this drive signal on a one-to-one basis. The liquid (ink) is ejected through the ejection opening by the growth and contraction of the bubble to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of a liquid (ink) having particularly excellent responsiveness can be achieved, which is more preferable. As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in U.S. Pat. No. 4,313,124 relating to the rate of temperature rise of the heat acting surface are adopted, more excellent printing can be performed.

As the configuration of the print head, in addition to the combination configuration (a linear liquid flow path or a right-angled liquid flow path) of a discharge port, a liquid path, and an electrothermal converter as disclosed in the above-mentioned respective specifications. A configuration using U.S. Pat. No. 4,558,333 or U.S. Pat. No. 4,459,600, which discloses a configuration in which a heat acting portion is arranged in a bending region, is also included in the present invention. In addition, for multiple electrothermal transducers,
JP-A-59-123670 which discloses a configuration in which a common slit is used as a discharge portion of an electrothermal transducer and JP-A-59-123670 which discloses a configuration in which an opening for absorbing a pressure wave of heat energy corresponds to a discharge portion. The effect of the present invention is effective even in a configuration based on JP-A-138461. That is, according to the present invention, printing can be performed reliably and efficiently regardless of the form of the print head.

In addition, it goes without saying that the print head can be configured in accordance with the form of the printing apparatus. In the case of a so-called line printer, the discharge ports are arranged in a range corresponding to the width of the print medium. What should be done. In addition, as a serial type print head as in the above example, a print head fixed to the apparatus main body, or an ink supply from the apparatus main body or an ink supply from the apparatus main body by being attached to the apparatus main body. The present invention is also effective when a replaceable chip-type printhead that can be used or a cartridge-type printhead in which an ink tank is provided integrally with the printhead itself is used.

It is preferable to add a print head ejection recovery means, a preliminary auxiliary means, and the like as the configuration of the printing apparatus of the present invention, since the effects of the present invention can be further stabilized. If you list these specifically,
Pre-heating means for heating using a capping means, a cleaning means, a pressure or suction means, an electrothermal converter or another heating element or a combination thereof for the print head, Pre-discharge means for performing another discharge can be given.

In addition, in the embodiment of the present invention described above, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower and which softens or liquefies at room temperature may be used. In general, the ink jet method generally controls the temperature of the ink itself within a range of 30 ° C. or more and 70 ° C. or less to control the temperature so that the viscosity of the ink is in a stable ejection range. Sometimes, the ink may be in a liquid state. In addition, in order to positively prevent temperature rise due to thermal energy by using it as energy for changing the state of the ink from a solid state to a liquid state, or to prevent evaporation of the ink, the ink is solidified in a standing state and heated. May be used. In any case, the ink liquefies by the application of the heat energy according to the print signal,
The present invention is also applicable to a case in which an ink having a property of being liquefied for the first time by the application of thermal energy, such as an ink in which a liquid ink is ejected and an ink which starts solidifying when it reaches a print medium, is used. . In such a case, the ink is held in a state in which the ink is held as a liquid or a solid in the concave portion or through hole of the porous sheet as described in JP-A-54-56847 or JP-A-60-71260. Alternatively, it may be configured to face the electrothermal converter. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition to the above, the present invention may be applied to an image output terminal of an information processing apparatus such as a computer, or may take a form of a copying apparatus combined with a reader or the like.

The printing apparatus and the printing apparatus control method according to the present invention may be applied to a system including a plurality of devices or to an apparatus including a single device. Needless to say, the printing apparatus and the printing apparatus control method according to the present invention can be applied to a case where the printing apparatus and the printing apparatus control method are achieved by supplying a program to a system or an apparatus.
In this case, by reading a storage medium storing a program represented by software for achieving the present invention into the system or the apparatus, the system or the apparatus can enjoy the effects of the present invention. Becomes

[0049]

As described above, according to the present invention, a mark is printed on the end of the conveyor belt surface by the marking means, and the conveyor belt on which the mark is printed is moved by the belt conveying means by a fixed distance. Each time the belt surface moves, a pattern drawn is detected by the imaging means, and a registered image obtained by this detection and a search image are compared and calculated.
Since the deviation of the movement amount caused by the belt transport means is corrected from the result of the comparison operation, it is possible to obtain a printing apparatus capable of performing high-precision printing at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating a schematic configuration of a printer unit and a transport unit in a fabric printing machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a schematic configuration of a fabric printing machine.

FIG. 3 is a flowchart illustrating one embodiment of a print position control method.

4A and 4B show a positional relationship between a registered image and a search image, wherein FIG. 4A is a schematic diagram showing a registered image before movement, and FIG. 4B is a schematic diagram showing a search image after movement.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording medium 110, 120 Belt conveyance means 130 Conveying belt 150 Marking means 301 First imaging means 302 Second imaging means 307 First image recording means 308 Second image recording means 309 Moving displacement amount calculating means 320 Moving amount Correction means

Claims (10)

[Claims] 1. A printing apparatus for intermittently feeding a transport belt by a belt transport means to move a recording medium on the transport belt to a predetermined position, and perform printing on the recording medium using a print head. Marking means for marking an alignment pattern on an end on the conveyor belt; first imaging means for imaging the marked alignment pattern; and the alignment imaged by the first imaging means A first image storage unit that stores a pattern as data of a registered image; and a second image capturing unit that captures search information including the alignment pattern on the transport belt at a position where the transport belt has moved by a predetermined distance by the belt transport unit. Second imaging means; second image storage means for storing data of the search image imaged by the second imaging means; A displacement calculator for comparing the image data and the data of the search image to calculate a displacement of the transport belt caused by the belt transporter; and a displacement calculated by the displacement calculator. A moving amount correcting unit for correcting a moving distance of the transport belt based on the amount. 2. The method according to claim 1, wherein the moving deviation amount calculating means calculates a moving deviation amount by a normalized correlation operation between the data of the registered image and the data of the search image.
The printing device according to the above. 3. The method according to claim 2, wherein the moving amount correcting unit performs correction based on a relative positional shift amount between the data of the registered image and the data of the search image obtained by the moving amount calculating unit. 3. The printing apparatus according to claim 1, wherein 4. The ink jet head for discharging ink or dye, wherein the marking means discharges the ink or dye from a plurality of fine holes of the ink jet head toward a belt surface. Item 4. The printing device according to any one of Items 1 to 3. 5. The printing apparatus according to claim 4, wherein the inkjet head uses Joule heat to generate bubbles in the ink or the dye, and discharges the ink or the dye as the bubbles are generated. . 6. A printing position at which a recording medium on the transport belt is moved to a predetermined position by intermittently feeding the transport belt using a belt transport means, and printing is performed on the recording medium using a print head. A control method, wherein an alignment pattern is marked on an end portion of the conveyor belt, the marked alignment pattern is detected, and the detected alignment pattern is stored as data of a registered image. Search information including the alignment pattern on the conveyor belt is detected at a position where the conveyor belt has moved by a fixed distance by the belt conveyor, and the search information including the detected alignment pattern is stored as search image data. And comparing the stored registered image data with the search image data to determine the position of the transport belt caused by the belt transport unit. A printing position control method comprising: calculating a shift amount; and correcting a shift distance of the transport belt based on the calculated shift amount. 7. The print position control method according to claim 6, wherein a displacement amount is calculated by a normalized correlation operation between the data of the registered image and the data of the search image. 8. The print position control method according to claim 6, wherein the correction is performed based on a relative displacement amount between the data of the registered image and the data of the search image. 9. Marking the alignment pattern using an ink jet head for discharging ink or dye, and discharging the ink or dye from a plurality of fine holes of the ink jet head toward the belt surface. 9. The print position control method according to claim 6, wherein: 10. The printing position according to claim 9, wherein the ink jet head uses Joule heat to generate bubbles in the ink or the dye, and discharges the ink or the dye as the bubbles are generated. Control method.