JPH10128989A - Ink jet recorder and head recovering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain simple and effective recovery sequence for preventing a decrease in printing quality after wiping by preliminarily discharging after a time of several seconds after the wiping, and stabilizing the printing quality of writing. SOLUTION: Suction recovering and wiping of normal recovering treatments are executed for an object head (S1 to S2), and whether the mounted head is color or not is judged. If it is colored, three seconds are waited, while if it is not colored, two seconds are waited (S3 to S5). In all cases, the head is preliminarily discharged after the waiting time is finished. Fault discharge or non-discharge due to clogging of a discharge port of the head is eliminated by a series of the recovering treatments, and whether it is recovered or not is judged (S6 to S7). If it is recovered, it is transferred to a print mode (S8), but if it is not recovered, it is again returned to the original, and the series of recovering treatments are repeated. Thus, clogging of the discharge port is easily eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus, a head recovery method and a recovery sequence for securing image stability and image reliability of the recording apparatus.

[0002]

2. Description of the Related Art In an ink jet system, recording is performed by discharging ink from a recording head onto a recording material, and a high-definition image can be recorded at a high speed. And the advantage that it is easy to record a color image using multicolor inks.

On the other hand, in an ink-jet recording apparatus using a liquid ink, the role of a reliability maintenance technique (recovery method) for preventing adverse effects on printing due to evaporation of a solvent in the ink or entrainment of bubbles, etc. is important.

As techniques for maintaining reliability, for example, preliminary discharge, wiping, suction recovery and the like can be mentioned.

[0005] Preliminary ejection means that, out of a plurality of nozzles of the head, a volatile component in the ink is partially evaporated from an orifice at the tip of the nozzle that has not been used for a while, resulting in insufficient ejection performance and recording quality. This is a means for maintaining the recording quality by performing an ink discharging operation toward an object other than the recording medium in order to eliminate the ink that has become a nozzle.

[0006] Wiping means that the direction of ink ejection changes due to ink droplets or paper dust adhering to the head surface where a plurality of orifices in a row are opened, and furthermore, non-ejection occurs. In order to prevent this, the head surface is wiped with an elastic wiper to remove them. After the wiping operation, the above-described preliminary ejection is usually performed in order to discharge the thickened ink or the like pushed into the orifice (ejection port) by the wiping to make a state in which normal ejection and image formation can be performed. is there. Further, it is also known that a wiper cleaning operation for removing thickened ink, paper dust and the like adhering to the wiper itself is performed before and after wiping as necessary.

[0007] Suction recovery refers to a case where air bubbles enter the nozzle or clogging occurs in the nozzle due to thickened ink generated by evaporation of volatile components in the ink in the nozzle, and the nozzle cannot be recovered even by preliminary ejection. When the ink runs out from the common liquid chamber where the nozzles and the plurality of ink flow paths communicate with each other, at the position where the cap and the print head face each other, the cap covers the surface of the print head and caps it. And filling the inside of the nozzle with ink suitable for recording by a method such as suctioning ink through a cap. After such suction recovery processing, wiping is generally performed to remove ink droplets and the like remaining on the head surface, and preliminary discharge is generally performed.

On the other hand, in recent years, there has been an increasing demand for robustness of recorded images, and as one example, it has been required to use inks having high water resistance. As such a highly water-resistant ink, an ink using a type of dye whose solubility in water decreases due to a pH change due to evaporation of volatile components on a recording paper as a recording medium has been proposed.

[0009]

As a result of examining a recovery operation for maintaining reliability in an ink jet recording head using such an ink, the density of a writing portion changes after wiping, and furthermore, the ejection of the writing portion becomes less. Due to instability, there is a case where the print quality is deteriorated, for example, the write-out portion is missing.

The present invention provides a simple and effective recovery sequence for preventing such deterioration in print quality after wiping.
An apparatus is provided.

[0011]

As a result of studying this problem, the present inventors have found that if preliminary discharge is performed after a few seconds after wiping, the print quality of writing can be stabilized and improved. I found out.

Although the clear reason for this phenomenon is unknown, the present inventors deduce as follows. In other words, the volatile components of the ink adhering to the head surface evaporate, so that the ink itself becomes insoluble and water-resistant, and the ink is pushed into the ejection port by wiping, so that the ink is ejected. The outlet will be as if it were covered. In this state, by waiting until the insoluble ink is re-dissolved by the ink inside the ejection port, it is presumed that the insoluble ink serving as the cover of the ejection port is eliminated and ink ejection becomes easier.

Conventionally, since the re-dissolution time of the insoluble ink is not planned, even if the reliability is maintained by pre-discharge after wiping, the effect of each recovery process is not sufficiently exhibited, and It is presumed that such deterioration in print quality has occurred.

According to the present invention, the pause time after wiping and before the preliminary ejection, that is, the time when the standby time is provided, is 1 in order to obtain the effect of re-dissolving the insoluble ink.
It takes at least 2 seconds to obtain a stable effect.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head having an ejection port for ejecting an ink which becomes water-insoluble after evaporation of a solvent to a recording medium, an ink flow path communicating with the ejection port, and a head attached to the surface of the head. Wiping means for wiping off deposits,
In an ink jet recording apparatus including a preliminary ejection unit that ejects ink separately from a normal recording operation from an ejection port of the head to reduce a flow resistance in the ejection port and the ink flow path, the wiping unit controls the head by the wiping unit. After a standby time after wiping the surface, preliminary ejection is performed on the head.

Here, the ink may contain a dye having at least a carboxylic acid group or a sulfate group, at least one of which is an ammonium salt.

Further, the waiting time may be 1 second or more and 3 seconds or less.

In the case where the ink jet printer further includes suction recovery means for covering the surface of the head in a sealed state and sucking the ink in the ejection port and the ink flow path along the direction in which the ink is ejected from the ejection port of the head. The suction recovery by the suction recovery unit may be performed before a series of processes from the wiping to the preliminary ejection.

Further, the present invention provides a head having an ejection port for ejecting an ink which becomes water-insoluble after evaporation of a solvent to a recording medium, and an ink flow path communicating with the ejection port, and a deposit attached to the surface of the head. An ink jet recording apparatus comprising: a wiping unit for wiping the ink; and a preliminary ejection unit for ejecting the ink from the ejection port of the head separately from the normal recording operation to reduce the flow resistance in the ejection port and the ink flow path. In the ejection method, after the wiping unit wipes the surface of the head, a preliminary ejection is performed on the head after a waiting time.

Here, when the head is a color head that discharges multi-color ink, a standby time from the wiping to the preliminary discharge may be 3 seconds, and the head may be a multi-color ink. If the color head is not a color head that discharges ink, the standby time from the wiping to the preliminary discharge may be set to 2 seconds.

Further, the waiting time from the wiping to the preliminary ejection may be not shorter than 1 second and not longer than 3 seconds.

As the ink which becomes insoluble in water after the evaporation of the solvent, an ink containing a dye having at least a carboxylic acid group or a sulfuric acid group, at least one of which is an ammonium salt, may be used.

Suction recovery means for covering the surface of the head in a sealed state by the ink jet recording apparatus, and for sucking ink in the discharge port and the ink flow path along a direction in which ink is discharged from the discharge port of the head; In the case of further including, the suction recovery by the suction recovery unit may be performed before a series of processes from the wiping to the preliminary ejection.

[Embodiment 1] A schematic configuration of an ink jet recording apparatus according to the present invention is shown in FIG. 1 and will be described. FIG. 1 is a perspective view showing the overall configuration of the recording apparatus. The recording apparatus 1 includes a paper feed unit 2, paper feed units 30, 34, 36, and 37, a paper discharge unit 41, carriages 5, 50, and cleaning units 6, 6.
0,61.

The carriage section 50 is provided with a head cartridge and an electrical contact section when the head cartridge is mounted. The electric contact portion is provided at an end of the flexible cable 56, and the opposite is attached to an electric board in a main body (not shown). The carriage 50 performs printing by ejecting ink droplets onto the recording paper while reciprocating along a guide shaft 81 for reciprocating scanning in a direction perpendicular to the recording paper conveyance direction (sub-scanning direction).

The cleaning unit 6 is provided at a home position in the recording apparatus 1 and performs a cleaning operation when the BK head cartridge 7 shown in FIG. And a cap 61 for preventing the ink from drying out and preventing dust from adhering to the nozzle portion. Further, a wiper blade is provided for removing dust adhering on the orifice surface where the orifice of the nozzle portion of the head opens and ink droplets adhering after the suction operation is performed. The material of the blade is
Elastic bodies such as non-hydrolyzable urethane rubber and HNBR rubber are preferred because they have no reactivity with ink and need to minimize damage to the face surface of the head.

FIG. 2 is a view for explaining the appearance of a first BK head cartridge (hereinafter, also simply referred to as a BK head) 7 mounted on the recording apparatus shown in FIG.
(A) is a rear view, (b) is a front (or face) view seen from arrow 4B of (a), and (c) and (d) are arrows 4C and 4D of (a), respectively. It is the side view seen from.

The BK head cartridge 7 has an easily replaceable ink jet recording head integrally formed with the ink tank. This head causes the ink to boil by heat generated by a means capable of applying heat to the ink by a heater or the like, and the pressure change caused by the growth or shrinkage of bubbles due to the film boiling causes the nozzle portion 70 of the recording head cartridge 7 to move. To form a printed image on a recording medium by discharging ink from the recording medium.

The nozzle section 70 is, for example, 12
8 discharge nozzles and the ink discharge amount is about 90n
g / dot, and the printing drive frequency is 6
KHz.

FIG. 3 is an exploded perspective view illustrating the structure of the carriage unit 5 in detail, and FIG.
FIG. 7 is a perspective view showing a state in which a K head cartridge 7 or a color head cartridge 101 described later is attached.

By attaching the BK head cartridge 7 to the carriage section 5, an electrical contact can be obtained.

FIGS. 5A to 5E show a color head cartridge 101 (hereinafter also referred to as a color head).
It is a figure explaining the outline of. The head 101 includes ink tank mounting sections 110 and 111.

As shown in FIGS. 5 (a), 5 (b) and 5 (c), an ink tank is provided between a color head 101 and a casing 103 having a pair of side plates and a back plate connecting the pair of side plates. It has a front plate 113 that forms a storage space, and a middle plate 104 that divides a space surrounded by these plates into two regions, and the divided space is formed by a mounting portion 110 of a color ink tank and a black ink tank. It becomes the mounting portion 111 of the tank.

At the bottom of the color head 101, an ink tank is inserted.
K, C, M, Y parts (120BK, 120C, 1 respectively)
20M, 120Y), the ink outlet pipes 107Y, 107M, 107 for insertion into the recording head unit 120 having the
C and 107BK (107M and 107BK are not shown) are provided, and a predetermined length protrudes into the inside of the mounting portions 110 and 111 so that they can be inserted into the ink tank.

As shown in FIG. 5, filters 109Y, 109M, 109C are provided at the openings inside the housing of the outlet pipe 107 provided on the side of the mounting sections 110, 111 where the color ink tank and the black ink tank are mounted. , 109
BK (109M, 109BK not shown) is provided, and a predetermined length protrudes into the inside of the mounting portions 110 and 111 so as to be inserted into the ink supply port of the ink tank.

FIG. 5 shows the flow from the outlet tube 107 to the recording head.
As shown in (d), the ink supply pipes 106Y, 106
M, 106C, and 106BK are provided on the bottom surface of the recording head.

On the surface of the mounting portion where the outlet pipe 107 is disposed, elastic plates 108a and 108b having a predetermined thickness are laid around the outlet pipe 107. The elastic plates 108a,
108b is designed so that the rib provided at the ink supply port of the ink tank does not come into pressure contact and the ink leaks into the inside of the color head.

Note that, as shown in FIG.
13 has a notch 112 at a position facing the mounting portion 111.
Is provided. This is such that a rib provided on a black ink tank containing black ink can be inserted, and is set so as not to cause erroneous insertion between the color ink tank containing yellow, magenta, and cyan. I have.

The mounting section 111 of the color head 101 having such a configuration is provided with an ink tank containing black ink, and the mounting section 110 is provided with a color ink tank containing yellow, magenta and cyan inks. You.

FIGS. 6 (a), (b), (c) and (d)
Is a BK ink tank 201 containing black ink.
1 is a side view, a front view, a bottom view, and an upper cross-sectional view, each of which is partially cut away. In the figure, reference numeral 201 denotes an ink tank, 202 denotes a housing for containing ink, and 203 denotes a lid member having an air communication opening 205. Reference numeral 204 denotes an upper member having a knob 204a used for attaching and detaching the tank. The outlet pipe 10 of the color head 101 is provided at the bottom of the ink tank.
7BK is inserted into the ink supply opening 208, the rib 215 protruding around the ink supply opening 208, the ink supply opening 2
And the inclined portions 214a and 214 connecting the ribs 215 and 08
14b.

The knob 204 of the ink tank 201
A rib 212 is provided on a part of the side surface on which a is provided, and in correspondence with the notch 112 provided on the front plate 113 of the mounting portion 111 of the color head 101,
Incorrect insertion of the ink tank 201 is prevented. The rib 212 is also used as a guide for mounting the ink tank 201. Reference numeral 206 denotes an ink container, which is a porous body made of a material such as urethane. Reference numeral 207 denotes an ink lead-out member, which is an ink holding member made of a fiber bundle material. Reference numeral 209 denotes a support member for supporting the ink lead-out member 207 in the tank.

Next, FIGS. 7A, 7B, 7C and 7D are schematic structural views for explaining a color ink tank. In this example, the color ink tank 321 containing yellow (Y), magenta (M), and cyan (C) inks is configured integrally with the ink tanks containing these inks. The configuration is the same as that of the black ink tank described with reference to FIG.

The color ink tank 321 has a structure in which the inside of the ink housing 322 is partitioned by partition members 336 and 337 having a substantially T shape. The storage amounts of the color inks stored in the respective ink tanks thus partitioned are set to be substantially equal.

The structure of the ink tank will be described.
The ink tank 321 covers the housing 322 for ink storage and the housing 322, and has openings 325Y, 325M,
A cover member 323 having 325C (M and C are not shown);
Each of the air communication openings 3 is attached to an upper portion of the lid member 323.
In addition to having a space serving as a buffer chamber so that ink leakage from the nozzle 25 does not reach the outside, one air opening port is provided at a position different from the position of each air communication opening 325, and a part thereof is detachably attached to the color head 101. And an upper member 324 having a knob 324a used when performing the operation.

At the bottom of the ink tank, ink supply openings 328Y, 328M, 32 into which the outlet pipes 107Y, 107M, 107C of the color head 101 are inserted.
8C and ribs 335Y, 3 protruding therearound.
35M, 335C, ink supply openings 328Y, 328
M, 328C and the inclined part 334a (Y, M, C) which connects the rib 335Y, 335M, 335C.

The ink tank 321 is provided with the color head 10
1, the ink supply openings 328Y, 328M, and 328C are connected to the outlet pipe 10 by using the rotation operation.
The 334a (Y, M, C) side is formed as an inclined surface having a gentle angle so as not to impede the smooth mounting by abutting against the front end of the nozzle 7.

In the ink tank 321, ink containers 326Y, 326M and 326C are stored.
Ink outlet members 327Y, 327M, 327C are provided between the ink containers 326Y, 326M, 326C and the ink supply openings 328Y, 328M, 328C. Then, the ink lead-out members 327Y, 327M, 3
27C for supporting 27C in the tank,
Slits for communicating the inside and the outside of the ink tank are provided in a part of the inner surfaces of 329M and 329C, respectively.

The color head 101 has a structure in which three types of black nozzles and color nozzles (Y, M, C) are arranged on a straight line. Specifically, black has a group of 64 nozzles, and is set so that the ejection amount of ink droplets is about 90 ng / dot (1 ng = 1 × 10 −9 g). The color nozzle is yellow,
Each of magenta and cyan has 24 nozzle groups, and the ejection amount of the ink droplet is set to be about 40 ng / dot. The distance between the nozzle groups of each color is approximately 8 nozzles. The printing drive frequency is BK
It is driven at the same 6 KHz as the head cartridge 7.

FIG. 8 shows that the ink tank 321 is positioned above the upper plate 114 of the front plate 113 of the ink jet unit 101.
The housing is rotatably mounted using a part of the housing as a guide. FIGS. 9A and 9B show a state of a replacement work as an outline of mounting the ink tank on the main body. FIGS. 10A and 10B are schematic diagrams showing the exchange operation of the head cartridge. The exchange of the BK head cartridge 7 and the color head cartridge 101 can also be performed.

As described above, the present invention is a recording apparatus in which the black head cartridge 7 and the color head cartridge 101 can be arbitrarily exchanged on the main body. It can be detected by.

The composition of the ink is such that black ink is superior in print quality to commonly used so-called plain paper, and has high character quality such as text.
In addition, a clear one was adopted. Further, as for the color inks, inks were used in which even if the inks were adjacent to each other, the image at the boundary was hard to blur. As any of the inks, those that become water-insoluble after a solvent such as water evaporates are employed.

The dye used in the ink contains one or more carboxylic acid groups and carbonic acid groups in its structure, and at least one of them is an ammonium salt.

Therefore, on the recording paper, the pH is lowered due to the volatilization of ammonia and the like, and the solubility of the dye is lowered, so that water resistance is exhibited.

Next, the compositions of the dyes and the inks used in the present embodiment are shown.

BK ink composition BK dye 3 parts Glycerin 5 parts Ethylene glycol 5 parts Urea 5 parts Isopropyl alcohol 3 parts Water remaining pH adjuster trace amount Color ink composition <Y ink> Y dye 2 parts Thiodiglycol 7 parts Glycerin 7 parts Urea 7 parts Surfactant 1 part pH adjuster trace water residue <M ink> M dye 3 parts Thiodiglycol 7 part Glycerin 7 parts Urea 7 part Surfactant 1 part pH adjuster trace water residual <C ink> C dye 4 Part 7 parts thiodiglycol 7 parts glycerin 7 parts urea 7 parts surfactant 1 part pH adjuster trace water remainder The above dyes may have the following structures, for example.

[0056]

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[0057]

Embedded image

[0058]

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[0059]

Embedded image

In this embodiment, regardless of whether the BK head or the color head is used, a pause of at least 2 seconds is taken after wiping, and then preliminary ejection is performed. According to this procedure, it is not necessary to distinguish the type of head, the timing of the wiping operation, and the like, and it is possible to prevent poor print quality after wiping with simple control.

After the suction recovery using the BK head and the color head, a test for printing 20 test patterns was repeated 10 times. As a result, in each case, there was no non-discharge at the start of writing.

[Comparative Example] A similar test was performed using the same printing apparatus as in the first embodiment, and changing the sequence so as to immediately perform preliminary ejection without a pause after wiping. As a result, in the color head, partial non-discharge occurred at the start of writing on 11 of 200 sheets.

[Embodiment 2] In this embodiment, only when a color head is mounted, after wiping, 3
After a pause of 2 seconds, preliminary discharge was performed.

In order to prevent bleeding and to realize a high image quality, the color ink has been devised to improve the permeability to paper. For this reason, the color ink has a low surface tension and easily wets the head surface, or the print quality after wiping is likely to deteriorate.

On the other hand, since this phenomenon is rare in a black head, the mounted recording head is identified, and only a color head is used to take a predetermined pause time after wiping to compare with a case where the black head is mounted. Thus, a decrease in throughput can be avoided.

[Embodiment 3] In the present embodiment, only when the color head is mounted, after the suction recovery, for three seconds only after wiping performed when a specified number or more of dots are printed during printing, After a rest period, preliminary ejection was performed.

In the present embodiment, only when a color head which tends to cause deterioration of print quality is mounted, and only after wiping in a state where a large amount of ink adheres to the head surface, the time until the preliminary discharge is reached. By providing a pause time, a decrease in print quality is prevented while a decrease in throughput is minimized.

FIG. 11 is a flowchart showing one embodiment of the ink jet head recovery method of the present invention.

As shown in FIG. 11, in S1 and S2,
Suction recovery and wiping, which are normal recovery processes, are performed on the target head. Next, in S3, it is determined whether or not the mounted head is a color head. If it is a color head, the process waits for 3 seconds in S4.
And wait 2 seconds. In any case, after the end of the standby time, the head is caused to perform preliminary ejection in S6, and the above-described S
Through a series of recovery processes from 1 to S6, it is determined whether or not defective ejection or non-ejection due to clogging of the ejection openings of the head has been resolved and the head has been restored. If it has recovered, it shifts to the print mode in S8, but if it has not recovered, it returns to S1 again.
And a series of recovery processing is performed.

By setting a standby time after wiping during such a series of recovery processing, clogging of the discharge port and the like can be easily eliminated. It is possible to recover the ink ejection characteristics.

[0071]

As described above, according to the present invention,
In the process of restoring the ink ejection characteristics to the head, a waiting time of several seconds is taken after wiping, and then preliminary ejection is performed, so that the print quality of writing can be stabilized. Therefore, it is possible to provide a recording apparatus that can secure image stability and image reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an entire recording apparatus.

2 (a) to 2 (d) are schematic diagrams showing the configuration of a BK head, FIG. 2 (a) is a plan view, FIG. 2 (b) is a front view, and FIGS. It is a side view.

FIG. 3 is an exploded perspective view illustrating a configuration of a carriage unit.

FIG. 4 is a schematic perspective view when a BK head or a color head is mounted on a carriage unit.

5A to 5E are diagrams showing a schematic configuration of a color head, FIG. 5A is a plan view, FIG. 5B is a cross-sectional view, and FIG. 5C is a side view of FIG. It is a figure and (d) and (e) are front views.

6 (a) to 6 (d) are diagrams showing a schematic configuration of a black ink tank for a color head, wherein FIG. 6 (a) is a partially cutaway plan view, and FIG. It is a side view, (c) is a front view, (d) is the top view which fractured and showed the part different from the fracture part of (a).

FIGS. 7A to 7D are diagrams showing a schematic configuration of a color ink tank for a color head, where FIG. 7A is a plan view with a part cut away, and FIG. It is a side view, (c) is a front view, (d) is a top view showing a lid.

FIG. 8 is a cross-sectional view illustrating a state when the ink tank is mounted on the color head.

FIGS. 9A and 9B are perspective views showing a state in which an ink tank of a color head is removed.

FIGS. 10A and 10B are perspective views showing a state in which a color head is removed from a carriage unit.

FIG. 11 is a flowchart illustrating an embodiment of a method for recovering an inkjet head according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording device 2 Paper supply part 5 Carriage part 6 Cleaning part 7 Black head cartridge 30-37 Transport part 41 Paper discharge part 50 Carriage 56 Flexible board 51 Head holder 60 Pump 61 Cap 70 Nozzle part 72 Base plate 73 Ink tank 74 Guide 78 Head Contact surface 101 Color head 103 Housing constituting head 104 Middle plate 106 Ink supply tube 107 Ink outlet tube 108 Elastic plate 109 Filter 110 BK tank mounting portion 111 Color tank mounting portion 112 Notch portion 113 Front plate 120 Head portion 201 Black Ink tank 202 Housing for accommodating ink 203 Cover member 204 Knob 205 Opening for air communication 206 Ink container 207 Ink lead-out member 208 Ink for ink supply 209 Member 212 Guide rib 214 Inclined portion 215 Supply port rib 321 Color ink tank 322 Ink housing 323 Cover member 324 Knob 325 Opening for air communication 326 Ink container 327 Ink lead-out member 328 Ink supply opening 329 Support member 334 Incline Part 335 rib part 336,337 T-shaped partition member 503 carriage contact surface

Claims (10)

[Claims] 1. A head having an ejection port for ejecting an ink that becomes water-insoluble after a solvent evaporates to a recording medium and an ink flow path communicating with the ejection port, and wiping for wiping off attached matter attached to the surface of the head. An ink jet recording apparatus comprising: means for ejecting ink from an ejection port of the head separately from a normal recording operation to reduce flow resistance in the ejection port and the ink flow path; An ink jet recording apparatus, wherein a preliminary ejection is performed on the head after a waiting time has elapsed after wiping the surface of the head. 2. The ink jet recording apparatus according to claim 1, wherein said ink contains a dye having at least a carboxylic acid group or a sulfate group, at least one of which is an ammonium salt. . 3. The ink jet recording apparatus according to claim 1, wherein the standby time is 1 second or more and 3 seconds or less. 4. A head surface is covered in a sealed state,
Suction recovery means for suctioning the ink in the discharge ports and the ink flow path along the direction in which the ink is discharged from the discharge ports of the head, and performing the suction recovery by the suction recovery means from the wiping to the preliminary discharge. The inkjet recording apparatus according to any one of claims 1 to 3, wherein the inkjet recording apparatus is performed before a series of processes described above. 5. A head having a discharge port for discharging ink that becomes water-insoluble after evaporation of a solvent to a recording medium, and a head having an ink flow path communicating with the discharge port, and wiping for wiping off substances attached to the surface of the head. Means, and a head recovery method by an ink jet recording apparatus including preliminary discharge means for discharging ink separately from a normal recording operation from the discharge port of the head to reduce the flow resistance in the discharge port and the ink flow path. A head recovery method, comprising: performing a preliminary ejection on the head after a lapse of a standby time after the wiping unit wipes the surface of the head. 6. The head recovery according to claim 5, wherein when the head is a color head that discharges multi-color ink, a standby time from the wiping to the preliminary discharge is set to three seconds. Method. 7. The head recovery method according to claim 5, wherein when the head is not a color head that discharges multi-color ink, a standby time from the wiping to the preliminary discharge is set to two seconds. . 8. The head recovery method according to claim 5, wherein a standby time from said wiping to said preliminary ejection is set to be 1 second or more and 3 seconds or less. 9. The ink according to claim 5, wherein an ink containing a dye having at least a carboxylic acid group or a sulfate group and at least one of which is an ammonium salt is used. Head recovery method described in the paragraph. 10. The ink jet recording apparatus covers the surface of the head in a sealed state, and sucks ink in the discharge port and the ink flow path along a direction in which ink is discharged from a discharge port of the head. 10. The head recovery according to claim 5, further comprising a suction recovery unit, wherein the suction recovery by the suction recovery unit is performed before a series of processes from the wiping to the preliminary ejection. Method.