JPH09201957A - Image recording device - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To accurately position and fix a recording head unit with respect to a head holder, and to improve workability when replacing or mounting the recording head unit. A recording device is provided. A recording head holding mechanism including a head holder 10 for removably positioning and holding a recording head unit 7 and a head pressing member 20 for fixing the recording head unit 7 in a positioned state, and the recording head holding mechanism is orthogonal to the head holder 10. In addition to the positioning portion for the three directions and the spring 13 for positioning in the ink arranging direction, the positioning in the other two directions is possible when the head pressing member 20 fixes the pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus, and more particularly, to an image recording apparatus which is structured so that a recording head unit is detachably held by a head holder and which can record an image by the recording head.

[0002]

2. Description of the Related Art An example of the configuration of a conventional image recording apparatus of this type will be described with reference to FIGS.

In FIG. 11, 101 is a recording head and 1
Reference numeral 02 denotes a base plate to which the recording head 101 is attached together with the wiring board 103, and 104 denotes the wiring board 1.
A flexible electrical signal cable whose one end is electrically connected to 03, 105 is an ink supply pipe for supplying recording ink to the recording head 101, and 106 is the ink supply pipe 105 connected to an ink tank side (not shown). Is a connector for supplying ink. In this example, a plurality of recording head units 107 having such a configuration are fixedly held in parallel to the head holder 110, and 120 is a head pressing plate, and the plurality of recording head units 107 are attached to the head holder 110. After positioning, the head pressing plate 120 is rotated around the rotation shaft 120A in the arrow T direction to fix each recording head unit 107. Reference numeral 111 denotes a fixing screw hole formed in the head holder 110. By screwing a fixing male screw 121 on the head pressing plate 120 side into the screw hole 111,
As shown in FIG. 12, the recording head unit 107 is detachably positioned at each fixed position of the head holder 120.
Reference numeral 122 is a knob for screwing, which is attached to the top of the fixing male screw 121.

Next, the recording head unit 107
The configuration for positioning the head on the head holder 110 will be described. In the head holder 110, 1
12 is an upper positioning groove, 113 is a lower positioning groove, 112A and 112B are upper tip abutting portions and upper side surface abutting portions for positioning the upper portion of the recording head unit 107 in the upper positioning groove 112, and 113B is a lower side surface. It is the contact portion. Furthermore, the recording head unit 10 is provided in the upper positioning groove 112 and the lower positioning groove 113.
7 is inserted in the direction of arrow S in FIG. 11, the side surface R of the base plate 102 is attached to the side surface contact portions 112B and 113B described above.
Leaf springs 114 and 115 are provided for biasing and positioning.

The base plate 10 is used for the above-mentioned insertion.
The upper and lower front surfaces 102A of the second contact the upper tip abutting portion 112A and the lower tip abutting portion 113A so that the recording head 1
The ink ejection surface 101A of No. 01 is exposed on the front surface of the head holder 110, and as shown in FIG.
The lower end surface 101B of 01 is positioned on the lower surface 110A of the exposed window of the head holder 110. 123 is a head holding plate 1
20 is a head pressing spring provided on the base plate 102. When each recording head unit 107 is positioned on the head holder 110 and further fixed by the head pressing plate 120 as shown in FIG. By interfering with the upper surface of the recording head unit 107, each recording head unit 107 is constrained in the positioning state and its displacement is prohibited. Thus, the ink ejection surface 101A of each recording head 101 can be held by the head holder 110 so as to maintain a predetermined space at a position facing a recording material (not shown).

The flexible electric signal cable 10
4 and the ink supply pipe 105 are connected to a connection portion (not shown) on the image recording apparatus side.

[0007]

However, in the above-mentioned conventional example, after the individual recording head units 107 are positioned, the recording head units 107 are fixedly positioned all at once by the head pressing spring 123 of the head pressing plate 120. On the other hand, when positioning each recording head unit 107, the base plate 10
The side surface R of the second plate is biased by the spring force of the springs 114 and 115 toward the upper and lower side surface contact portions 112B and 113B of the upper positioning groove 112 and the lower positioning groove 113, and is brought into contact with the front surface 102A of the base plate 102. Since the tip end contact portions 112A and 113A are brought into contact with each other, if the spring force of the springs 114 and 115 is too strong, the base pressing plate 1 is not accurately positioned.
There was a case where it was fixed by 20 and its holding spring 123.

Further, if the spring force of the presser spring 123 is too strong, it becomes difficult to screw the base presser plate 120 to the head holder 110, and in some cases, the base presser plate 120 may be screwed.
Bending may occur, and a sufficient spring force may not be obtained.

Therefore, it is necessary to confirm whether or not the recording head unit 107 is accurately positioned each time the recording head unit 107 is replaced, and after the positioning and fixing are further fixed, the ink supply connector 106 and the flexible electric signal cable. Each 104 has to be connected to the device side, which not only takes time and effort for replacement, but also may cause inconveniences such as recording failure and ink leakage due to connection forgetting or connection error. Particularly, in recent years, the recording head 101 tends to be elongated due to the increase of the recording width, and in the recording head that ejects ink by using thermal energy,
Since cooling water is supplied around the recording head and a connector is provided for connecting the cooling pipe, replacement work becomes more complicated due to the connection, which may cause various inconveniences. .

A first object of the present invention is to provide an image recording apparatus which facilitates accurate positioning of the recording head unit with respect to the head holder.

A second object of the present invention is to provide an image in which the connection of ink, electric signal cable, cooling water pipe and the like can be obtained almost at the same time as the connection of the recording head unit, and the replacement work can be facilitated. To provide a recording device.

[0012]

In order to achieve the first object, the first aspect of the present invention is to print by selectively ejecting ink from a plurality of linearly arranged ink ejection ports. An image recording apparatus having a recording head holding mechanism including a head holder for removably positioning and holding a recording head unit for performing the above, and a head pressing member for fixing the recording head unit to the head holder in a positioned state. A positioning unit that positions the recording head unit in the ink ejection port arrangement direction, the ink ejection direction, and the ejection direction, and a side direction that is orthogonal to the ejection direction; and a positioning unit that positions the recording head unit in the ink arrangement direction. Positioning means for positioning the head holder on the head holder, and the positioning means is positioned on the positioning portion of the head holder. The recording head unit is pressed and fixed in the ink ejection direction by the head pressing member, and the recording head unit is positioned with respect to the head holder in the ink ejection direction and the lateral direction. It is a thing.

In order to achieve the second object, the second aspect of the present invention is a recording head unit for selectively ejecting ink from a plurality of linearly arranged ink ejection ports for recording. In the image recording apparatus, there is provided a recording head holding mechanism including a head holder for removably positioning and holding the head holder, and a head pressing member for fixing the recording head unit to the head holder in a positioned state. Has at least one of a recording signal wiring terminal for selectively ejecting ink, the ink supply connection port, and the cooling medium supply connection port, and the head pressing member is provided with the wiring terminal. A connector corresponding to at least one of the ink supply connection port and the cooling medium supply connection port, and press-fixes the head pressing member. At least one set of a connector corresponding to the wiring terminal, a connector corresponding to the ink supply connection port, and a connector corresponding to the cooling medium supply connection port is simultaneously connected depending on the operation. Is.

According to the first aspect of the present invention, when the recording head unit is mounted on the head holder, the unit is positioned by the positioning means of the head holder on the positioning portion in the ink ejection port arrangement direction, and the recording head unit is also arranged. The head pressing member presses the recording head unit in the ink ejection direction, and the pressing operation can position and fix the recording head unit in the ink ejection direction and the lateral direction. While the recording head unit is positioned in the ink ejection port array direction by the positioning means, the head pressing member positions the recording head unit in two directions, that is, the ink ejection direction and the lateral direction. It has become possible to fix it while it is positioned at.

According to the second aspect of the present invention, at least one of the recording signal wiring terminal, the ink supply connection port, and the cooling medium supply connection port on the recording head unit side is connected to the head pressing member side. Since the head pressing member can be attached to one of the corresponding connectors at the same time when the head pressing member is pressed and fixed, and the head pressing member can be separated at the same time when the head pressing member is removed, it contributes to the improvement of the workability at the time of replacement of the recording head unit and the erroneous operation can be prevented.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail and specifically with reference to the drawings.

FIG. 1 shows a configuration according to an embodiment of the present invention. Here, 1 is a recording head, 2 is a base plate that integrally holds the wiring board 3 and the recording head 1, 5 is an ink supply tube whose middle is fixedly supported by an ink supply tube supporting portion 2B of the base plate 2, and 6 is ink. Reference numeral 7 denotes an ink supply connector provided at the end of the supply pipe 5, and 7 denotes a detachable recording head unit having the above-described configuration. In this example, three colors of cyan, magenta, and yellow are used. Four recording head units 7 capable of ejecting black ink are positioned on the head holder 10. The base plate 2 and the wiring board 3 are formed in a substantially rectangular shape, and a terminal group 3A for connecting to a flexible electric signal cable is formed at one end of the wiring board 3. Further, 2A and 2C are a tip positioning portion and a side surface regulating portion of the recording head unit 7, which are provided on the end portion of the base plate 2 on the recording head 1 side and on both sides.

Next, the head holder 10 according to the present invention.
Will be described. Reference numeral 10A denotes a window which is formed in the head holder 10 and exposes the ink ejection port surface 1A of the recording head 1 in each recording head unit 7 toward the recording material (not shown) side as shown in FIG. Window 10A
As shown in FIG. 2, an abutting portion 10B with which the leading end positioning portion 2A of the recording head unit 7 is abutted and positioned is formed on one end face and the inner surface of the holder thereof. 11
Is a male screw for fixing each head pressing member 20 to the head holder 10 as described later. Also,
Reference numeral 10C denotes a side contact portion on the holder 10 side that keeps the base plate side surface restricting portion 2C of the unit 7 in contact with the recording head unit 7 when the recording head unit 7 is positioned on the head holder 10. Reference numeral 13 denotes the recording head unit via the base plate 2. 7 is a positioning leaf spring for biasing 7 toward the above-mentioned contact portion 10B shown in FIG. 2 as indicated by an arrow K, and the recording head 1 as shown in FIG.
The positioning in the longitudinal direction (direction of the ejection port array) can be obtained.

Next, the details of the head pressing member 20 are shown in FIG.
This will be described below. Reference numeral 21 is a fixing screw for screwing the head pressing member 20 to the male screw 11 of the head holder 10 for fastening.
22 is the knob. In addition, the head pressing member 20 is attached to the head holder 10 from above the recording head unit 7.
A connector (hereinafter referred to as an edge connector) 24 for connecting the flexible electric signal cable 4 to the terminal group 3A provided on the wiring board 3 of the recording head unit 7 while being used as a handle for mounting the recording head unit 7 on the arrow U An inverted U-shaped member (hereinafter referred to as a head pressing handle member) 25 that also functions as a guide rail for guiding in the direction is provided. 24A is a connector guide groove that is slidably held along both sides of the head pressing handle member 25, and 24B is a handle (connector used when attaching and detaching the edge connector 24 to and from the wiring board terminal group 3A of the recording head unit 7). The connector connector 24B can be easily detached from the terminal group 3A by manually gripping the connector handle 24B simultaneously with the horizontal grip 25A of the head pressing handle member 25. Since the grip portion 25A of the head pressing handle member 25 prevents the handle 24 from coming out upward, the edge connector 24 can always be handled integrally with the head pressing member 20.

In the structure according to the present invention, by mounting the head pressing member 20, each recording head unit 7 is positioned and fixed to the head holder 10 for each unit, and the flexible electric signal cable 4 is electrically connected to the recording head unit 7. The connection and the connection of the cooling medium supply pipe to the recording head 1 are possible at the same time, and the configuration thereof will be described below.

In FIGS. 1 and 2, reference numeral 26 denotes a recording head unit pressing member having a pressing portion 26A at its tip,
Reference numeral 27 is a cooling medium supply pipe having a cooling medium supply connector portion 27A at its tip. The unit pressing member 26
2 and 5 and 6, spring receivers 26B and 27B are fixed to the cooling medium supply pipe 27, 28A and 28B are coil springs, and 20A and 20B are projected from the head pressing member 20. A spring receiving bracket that is provided to hold the springs 28A and 28B in a compressed state, and 20C is a bracket that rotatably supports the fixing screw 21 described above. In addition,
The spring 28A described above is between the spring bearing 26B and the spring bearing bracket 20A, and the spring 28B is the spring bearing 27.
B (see FIG. 5) and the spring receiving bracket 20B,
It is held around the unit pressing member 26 and the cooling medium supply pipe 27.

Reference numeral 29 is a leaf spring disposed on both sides of one surface of the main body of the head pressing member 20, and these leaf springs 29 record in the mounted state of the head pressing member 20 as shown in FIG. The base plate 2 of the head unit 7 can be biased toward the contact portion 10C of the head holder 10 to position the recording head unit 7 in the direction of the arrow L (see FIG. 1). Thus, the head holder 10
In the state where the individual recording head units 7 are inserted and positioned in the direction of the arrow J, and the recording head units 7 are fixed by the head pressing member 20 as shown in FIG. 2, the spring force of the spring 28A as shown in FIG. Base plate 2
The upper edge portion 2E of the upper pressing portion 26A of the head pressing member 26.
The lower edge portion 2D of the base plate 2 is positioned on the bottom surface 10D of the head holder 10 and the one end positioning portion 2A of the base plate 2 is fixed to the contacting portion 10B of the head holder 10 so as to be positioned. be able to.

Further, in such a mounted state of the head pressing member 20 to the head holder 10, the cooling medium supply pipe 2 is provided.
7 by the spring force of the spring 28B.
By simultaneously connecting to the inlets / outlets 30A and 30B of the cooling passage 30 of the recording head 1 shown in FIG. 1, the cooling medium supply system around the recording head 1 can be put in the mounted state.
31 is a packing for sealing. In order to connect the edge connector 24 to the terminal group 3A of the wiring board 3, it is sufficient to push down the edge connector 24 along both sides of the head pressing handle member 25 as shown in FIG. The handle 24B of the edge connector 24 can be used to perform the pressing operation. Furthermore, D in FIG. 2 indicates a stroke required when the edge connector 24 is detached from the terminal group 3A. Further, in FIG. 2, reference numeral 40 denotes a cap member that comes into contact with the ink ejection opening surface 1A of the recording head 1 to perform a suction recovery operation. As shown in (1), it is kept separated from the ink ejection port surface 1A.

FIG. 3 and FIG. 4 are views of the recording head unit 7 according to the present invention as viewed from the side of the head supply system and the side of the ejection element arranged on the ink ejection port surface 1A, respectively. The individual ink ejection ports 1B communicate with liquid passages (not shown) provided in the ejection elements, and elements for generating ejection energy are arranged in the respective liquid passages, and these elements are wired. By being selectively driven by a drive circuit provided on the substrate 3, the ink is ejected as an ink droplet from the ink ejection port 1B, and recording is performed. The base plate 2 is made of a metal material such as aluminum,
A head cooling system as shown in FIG. 3 is provided on the back surface side of the ejection element.

In this example, the cap member 40 is individually attached to the ink ejection port surface 1A of each recording head unit 7 to perform the suction recovery operation.
If this is performed with the cap member 40 (see FIG. 2) attached when the recording head unit 7 is replaced, the pressing force of the cap member 40 against the ink ejection port surface 1A is applied to the head holder 10 of the recording head unit 7. This is because there is a risk of hindering the operation during positioning and fixing the head pressing member 20. Therefore, when the recording head unit 7 is replaced, the cap member 40 can be separated from the ink ejection port surface 1A to eliminate the above-mentioned fear. The positioning of the recording head unit 7 in the direction indicated by the arrow K in FIG. 1 is set by the spring force of the leaf spring 13, but since the pushing force of the cap member 40 does not act as described above, the base plate 2 is not moved. It is sufficient that the leaf spring 13 has an acting force of, for example, about 300 gf without requiring an excessive spring force for bending.

Further, the fixing screw 21 of the head pressing member 20
Only by lightly screwing the tip into the male screw 11 on the head holder 10 side, the pressing portion 26A of the pressing member 26 and the connector portion 27A of the cooling medium supply pipe 27 are respectively connected to the base plate 2 by the spring force of the coil springs 28A and 28B.
The upper edge 2E and the cooling pipe inlets / outlets 30A and 30B can be easily brought into contact with each other, so that the head members 20 can be simply tightened via the respective knobs 22 to compress the coil springs 28A and 28B. As a result, the recording head unit 7 can be sufficiently fixed and a sufficient connection state of the cooling pipe system can be obtained.

5 and 6 show the operation in the process of mounting the head pressing member 20 from above the recording head unit 7. FIG. 5 shows the state before the mounting and FIG. 6 shows the state after the mounting. That is, in the state of FIG. 5, the pressing portion 26A of the pressing member 26 and the connector portion 2 of the cooling medium supply pipe 27 are
7A are respectively located above the upper edge 2E of the base plate on the recording head unit 7 side and the cooling medium inlet / outlet ports 30A and 30B. Then, with the head pressing member 20 attached to the head holder 10 shown in FIG.
6A is the upper edge 2 of the base plate due to the spring force of the spring 28A.
When the connector portion 27A is pressed against E and the spring force of the spring 28B causes the cooling medium inlet / outlet 30A of the head cooling passage 30,
Press contact with 30B. Thus, the recording head unit 7 can be fixed in the positioning state by the head pressing member 20, and at the same time, the cooling medium supply pipe 27 can be securely connected to the recording head 1 in a liquid-tight manner, and the labor of the connection work can be saved. .

As the cooling medium, pure water, tap water, or a dedicated cooling liquid can be used.

7 to 9 show another embodiment of the present invention.
The ink supply pipe can be connected to the recording head 1 at the same time. In the case of this example, the ink supply tubes 5 and 5 are slidably held by one spring receiving bracket 20A (bracket shown on the left side in FIG. 7) together with the pressing member 26 on that side. 5A is attached to the end of each ink supply pipe 5,
An ink supply connector 5B connected to an ink supply port (not shown) on the recording head 1 side is a spring receiver, and a coil spring 50 for pressurization is interposed between the upper spring receiver bracket 20A and the spring receiver 5B. Has been done. The connection operation by the ink supply connector 5A follows the connection operation of the cooling pipe 27, and the description thereof will be omitted.

In the case of this example, the two ink supply pipes 5 and 5 are collectively held by one spring receiving bracket 20A so as to be slidable, but one by one on both the left and right spring receiving brackets 20A. They may be individually held, or a spring receiving bracket (not shown) for slidably holding the ink supply tubes 5 and 5 may be provided on the head pressing member 20 separately from the spring receiving bracket 20A. You may FIG. 8 shows a configuration example of the recording head unit 7 side to which the above-mentioned ink supply connector 5A is respectively connected. Here, 5C and 5C are connection ports thereof,
Further, 51 is a packing disposed around the connection ports 5C and 5C. Further, FIG. 9 shows a state in which the head pressing member 20 shown in FIG. 7 is attached to the head holder 10.

FIG. 10 shows still another embodiment of the present invention.
In this example, in order to make it easier to mount the head pressing member 20 on the head holder 10, a guide shaft 61 is provided in the mounting direction from the head holder 10, and a retaining metal fitting 62 is fixed to the top of each guide shaft 61. It was done like this. Reference numeral 20D is a guide bearing bracket projectingly provided on the head pressing member 20 side, and the respective guide shafts 61 are slidably held on these bearing brackets 20D. Although the print head unit 7 is not shown in FIG. 10 for the sake of clarity, the other configurations are the same as those of the embodiments described above and the description thereof is omitted.

In the image recording apparatus having such a structure, the head pressing member 20 of the recording head unit to be replaced is indicated by an arrow in FIG. W
As shown in FIG. 3, the print head unit can be detached from the head holder 10 by simply pulling it up, disconnecting the electrical connection with the print head unit and the connection of the cooling medium supply pipe and the ink supply pipe. Then, after positioning the replaced recording head unit on the head holder 10, the head pressing member 20 is moved from above to the guide shaft 61.
It is only necessary to pull it down in the direction of the arrow W along the direction and screw the fixing screw 21 to the male screw 11 with the knob 22. By doing so, not only the replacement work can be facilitated, but also the head pressing member corresponding to the replaced recording head unit can be definitely used and fixed, which contributes to the improvement of the workability of the replacement work.

In each of the embodiments described above, the recording apparatus in which a plurality of ink jet recording heads are held by the head holder has been described, but the application of the present invention applies such a plurality of recording heads to one recording head. The present invention is not limited to the case where it is held by the head holder, and as long as the recording head itself is a replaceable one that requires accurate positioning and fixing to the head holder, it does not matter what type of inkjet recording head. It goes without saying that it is okay.

[0034]

As described above, according to the present invention, the recording head unit is positioned to position the ink ejection ports in the arrangement direction, the ink ejection direction and the ejection direction, and the lateral direction orthogonal to the arrangement direction. And a positioning means for positioning the recording head unit at a positioning part in the ink arrangement direction are provided in the head holder, and the recording head unit positioned at the positioning part of the head holder is provided by the head pressing member. Since the recording head unit is pressed and fixed toward the ink ejection direction and the recording head unit is positioned with respect to the head holder in the ink ejection direction and the lateral direction,
When the recording head unit is positioned and fixed to the head holder, the recording head unit will not be fixed without being accurately positioned, and the recording head unit has a recording signal wiring for selectively ejecting ink. At least one of a terminal, a connection port for supplying the ink and a connection port for supplying the cooling medium is provided, and the head pressing member is connected to the wiring terminal, the connection port for supplying the ink and the connection for supplying the cooling medium. A connector corresponding to at least one of the ports, the connector corresponding to the wiring terminal by the pressing and fixing operation of the head pressing member, the connector corresponding to the ink supply connection port, and the cooling medium supply connection. Since at least one set of the connector corresponding to the mouth is simultaneously connected, the head pressing portion of the recording head unit At least one of the recording signal wiring, the ink supply path, and the cooling medium supply path can be simultaneously connected around the recording head unit when fixed by the fixing by the above, and the workability at the time of unit replacement can be improved and the connection can be achieved. Errors can be prevented, and the reliability of the recording operation can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a recording head holding mechanism according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of the recording head holding mechanism shown in FIG. 1 in an assembled state.

FIG. 3 is a perspective view showing the configuration of the recording head unit shown in FIG. 1 as viewed from the cooling medium supply side.

FIG. 4 is a perspective view showing the configuration of the recording head unit shown in FIG. 1 as viewed from the ink ejection mechanism side.

FIG. 5 is an explanatory diagram showing a state before mounting the head pressing member according to the first embodiment of the present invention.

FIG. 6 is an explanatory view showing a mounted state of a head pressing member according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing a structure of a head pressing member according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of a recording head unit according to a second embodiment of the invention.

FIG. 9 is a sectional view showing a structure of a recording head holding mechanism according to a second embodiment of the present invention in an assembled state.

FIG. 10 is a perspective view showing the features of the configuration according to the third embodiment of the present invention.

FIG. 11 is an exploded perspective view showing a configuration example of a recording head holding mechanism according to a conventional example.

12 is a sectional view showing the recording head holding mechanism shown in FIG. 11 in an assembled state.

[Explanation of symbols]

 1 Recording head 1A Ink ejection port surface 1B Ink ejection port 2 Base plate 2A Tip positioning part 2B Ink supply pipe support part 2C Side regulating part 2D Lower edge part 2E Upper edge part 3 Wiring board 3A Terminal group 4 Flexible electrical signal cable 5 Ink supply Tube 5A Ink supply connector 5B Spring receiver 5C Connection port 6 Ink supply connector 7 Recording head unit 10 Head holder 10A Window 10B Contact portion 10D Bottom surface 11 Male screw 13 Positioning leaf spring 20 Head pressing member 20A, 20B, 20C, 20D Bracket 21 Fixing screw 22 Knob 24 (Edge) connector 24B (for connector) handle 25 Head holding handle member 25A Grip part 26 Pressing member 26A Pressing part 27 Cooling medium supply pipe 27A Connector part 28A, 28B Coil spring 29 The spring 30 cooling passage 30A, 30B doorway 40 the cap member 50 a spring 51 Packing 61 guide shaft 62 stopper fitting

Claims (10)

[Claims] 1. A head holder for removably positioning and holding a recording head unit that selectively ejects ink from a plurality of linearly arranged ink ejection ports for recording, and the recording is performed on the head holder. In an image recording apparatus having a recording head holding mechanism including a head pressing member for fixing the head unit in a positioning state, the recording head unit is arranged in the ink ejection port array direction, the ink ejection direction, and the ejection direction, the array direction. The head holder is provided with a positioning portion for positioning the recording head unit at a positioning portion in the ink arrangement direction, and a positioning portion for positioning the recording head unit at the positioning portion in the ink arrangement direction. Orient the recording head unit in the ink ejection direction by the head pressing member. An image recording apparatus and pressure fixed, characterized in that the recording head units so as to position in the ink ejection direction and the side direction with respect to the head holder. 2. A head holder that removably positions and holds a recording head unit that selectively ejects ink from a plurality of linearly arranged ink ejection ports for recording, and the recording is performed on the head holder. In an image recording apparatus having a recording head holding mechanism including a head pressing member for fixing the head unit in a positioning state, the recording head unit includes a recording signal wiring terminal for selectively ejecting ink, the ink At least one of the supply connection port and the cooling medium supply connection port, and the head pressing member is at least one of the wiring terminal, the ink supply connection port, and the cooling medium supply connection port. Connector corresponding to the wiring terminal, the connector corresponding to the wiring terminal and the supply of the ink by the pressing and fixing operation of the head pressing member. An image recording apparatus, wherein at least one set of a connector corresponding to a supply connection port and a connector corresponding to the cooling medium supply connection port is simultaneously connected. 3. The recording head unit has at least one of a recording signal wiring terminal for selectively ejecting ink, a connection port for supplying the ink and a connection port for supplying a cooling medium, The head pressing member includes a connector corresponding to at least one of the wiring terminal, the ink supply connection port, and the cooling medium supply connection port, and corresponds to the wiring terminal by the pressing and fixing operation of the head pressing member. 2. The image recording according to claim 1, wherein at least one set of a connector, a connector corresponding to the ink supply connection port, and a connector corresponding to the cooling medium supply connection port is simultaneously connected. apparatus. 4. A head holder capable of removably positioning and fixing a recording head unit for ejecting ink for recording, a detachable cap member on an ink ejection port surface of the recording head unit, and the cap member. In an image recording apparatus having a moving unit capable of retracting closely to the ink ejection port surface, the cap member is retracted from the ink ejection port surface at least when the recording head unit is positioned and fixed to the head holder. An image recording device characterized by: 5. A head member that is detachable from the ink ejection port surface of the recording head unit, and a moving unit that allows the cap member to come into close contact with and retract from the ink ejection port surface, 4. The image recording apparatus according to claim 1, wherein the cap member is retracted from the ink ejection port surface at least when the recording head unit is positioned and fixed. 6. The image recording apparatus according to claim 1, wherein a plurality of the recording head units are positioned in one head holder by individual head pressing members. 7. The image recording apparatus according to claim 6, wherein color recording is possible by a plurality of the recording head units. 8. The image recording apparatus according to claim 1, wherein the recording head unit has an electrothermal converter that generates heat energy used as energy for ejecting ink. apparatus. 9. The recording head unit uses the heat generated by the electrothermal converter to generate bubbles in the ink,
The image recording apparatus according to claim 7, wherein the ink is ejected in accordance with a change in pressure due to the bubbling. 10. The image recording apparatus according to claim 1, wherein the recording head unit ejects ink by utilizing a pressure change caused by a piezoelectric element.