JP3267398B2 - Inkjet head assembly and method of assembling the inkjet head assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet head assembly used for recording by forming a flying droplet by heating a liquid and a method of assembling the same.

[0002]

2. Description of the Related Art An ink jet head having a structure in which a nozzle corresponding to a heater pattern is formed by bonding and adjusting a grooved top plate in accordance with a heater pattern has been proposed. It is produced at low cost. This type of head has a dot pitch of about 60 μm to 70 μm (360 dp).
i-400 dpi) are actually mass-produced.

[0003]

However, in the above-mentioned conventional example, since the grooved top plate is mechanically adjusted on the order of several microns in accordance with the heater pattern, a high-definition inkjet head (for example, a dot pitch of 40
μm or less: When manufacturing at 600 dpi), there is a problem that the margin of the bonding accuracy becomes extremely small, bonding becomes extremely difficult, and high forming accuracy is required even for a grooved top plate. .

[0004] Further, since the dot pitch becomes narrow, there is a problem that the wall between nozzles becomes thin and the strength becomes weak.

The present invention has been made in view of the above-mentioned problems of the prior art,
It is an object of the present invention to provide an inkjet head assembly that achieves high-definition printing using an inkjet head that can be sufficiently produced by conventional techniques.

[0006]

According to the present invention, there is provided an ink jet head chip having a nozzle array in which a plurality of nozzles for discharging ink are arranged so as to intersect in a main scanning direction. In the inkjet head assembly, a plurality of head chips are fixed to the frame side by side in the main scanning direction, and the head chips are separated from each other by a predetermined distance with respect to the frame body so as to be displaced in the nozzle arrangement direction at predetermined intervals. The frame is fixed to the frame by an adhesive. In this inkjet head assembly, each of the head chips may be fixed to the frame so that a dot interval is constant when landing is performed in a nozzle arrangement direction ejected from each of the head chips. preferable. Further, it is preferable that each of the head chips is the same type of head chip. Each of the head chips has an ink supply pipe for supplying ink to each of the head chips, and an ink supply port of the ink supply pipe holds one ink tank for holding ink supplied to each of the head chips. It is preferable that ink is supplied to each of the plurality of ink supply ports, and ink is supplied from each of the ink supply ports of the one ink tank to each of the head chips via each of the ink supply pipes. Further, each of the head chips has two types having different structures, and the two types of head chips each include a base plate provided with a plurality of discharge energy generating elements for generating discharge energy for discharging ink from the plurality of nozzles. It is preferable that the ink supply pipes for supplying ink to the respective head chips have ink supply ports facing the same direction, and the base plates are arranged to face each other. In this case, the ink supply ports of the respective ink supply pipes are respectively attached to the plurality of ink supply ports of one ink tank holding the ink supplied to the respective head chips,
It is preferable that ink is supplied from each ink supply port of one ink tank to each of the head chips via each of the ink supply pipes. Alternatively, each of the head chips has two types having different structures, and the two types of head chips have the same ink supply port side of an ink supply pipe for supplying ink to each of the head chips, and It is preferable that the ink supply ports of the supply pipe are arranged adjacent to each other. In this case, the ink supply port of the adjacent ink supply pipe is attached to one ink supply port provided in an ink tank holding the ink supplied to each of the head chips, and one ink supply port of the ink tank is provided. It is preferable that ink is supplied from an opening to each of the head chips via each of the ink supply tubes. It is preferable that the two types of head chips are fixed to the frame so that a dot interval becomes constant when landing is performed in the nozzle arrangement direction ejected from the two types of head chips. It is preferable that the frame has a groove for holding the adhesive at a position corresponding to each of the head chips. It is preferable that the head chip includes an electrothermal converter for generating thermal energy for ink ejection. In this case, it is preferable that the head chip ejects the ink from each of the nozzles by using the film boiling generated in the ink by the thermal energy applied by the electrothermal transducer. Also, the present invention
Assembling of an inkjet head assembly in which a plurality of inkjet head chips each having a nozzle row in which a plurality of nozzles for ejecting ink intersect in the main scanning direction are arranged in the main scanning direction and fixed to a frame body A step of positioning each of said head chips so as to be shifted in a nozzle arrangement direction at predetermined intervals without abutting on said frame, and an adhesive interposed between said head chip and said frame. And fixing the head chips to the frame at the predetermined intervals. In this case, the step of positioning may be a step of positioning the head chips so that a dot interval becomes constant when landing in the nozzle arrangement direction ejected from each of the head chips. preferable.

[0007]

According to the present invention having the above-described structure, head chips which can be sufficiently produced by the conventional technique are arranged such that the dot interval becomes constant when the landing in the nozzle arrangement direction ejected from each head chip is overlapped. By arranging a plurality of nozzles at predetermined intervals in the nozzle arrangement direction so as to be attached to the frame, a high-definition head can be easily manufactured.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a perspective view showing the structure of a first embodiment of the ink jet head assembly of the present invention, and FIG. 2 is a structure in which an ink tank is mounted on the ink jet head assembly shown in FIG. FIG.

The ink jet head assembly according to the present embodiment includes a frame 1 as shown in FIG. 1, and a head chip 2 having a nozzle array that crosses in the main scanning direction is provided in the frame 1. Are arranged in parallel at predetermined intervals in the nozzle arrangement direction so that the dot intervals are constant when the droplets ejected from the nozzles in the arrangement direction are overlapped. (Not shown) is provided. Each head chip 2 is fixed to the frame 1 via an adhesive 4, 13. The head chip 2 has a dot pitch of 3
60 dpi (70.5 μm) is used.

Then, as shown in FIG. 2, an ink tank 6 is mounted on the frame 1 constituting the ink jet head assembly via a cover 5 that covers the surface of the ink jet head assembly except for the ejection port forming surface of the head chip.

Next, an assembling process of the ink jet head assembly will be described.

First, the process of assembling the head chip will be described.

FIG. 3 is an exploded perspective view of a head chip constituting the ink jet head assembly shown in FIG.

In FIG. 3, a circuit board 2 electrically wired
b is attached to the base plate 2a.
A heater board 2c in which a heater row is formed is bonded to the end of "a".

Next, the terminal pads of the heater boat 2c and the electric wiring of the circuit board 2b are connected by wire bonding or the like.

Next, the grooved top plate 2d is formed of a resin, and a water-repellent agent is applied to the discharge port forming surface to form an orifice using a laser or the like.

Then, the grooved top plate 2d is connected to the heater board 2
c, while adjusting so that the heater pattern (not shown) is substantially at the center of the groove of the grooved top plate 2d.

When the adjustment is completed, the grooved top plate 2d is temporarily fixed with a UV adhesive or the like, and the top plate 2d with the groove is fixed to the heater board 2c by the pressing spring 2e.

Further, an ink supply auxiliary member 2f serving as a flow path for supplying ink is attached to the grooved top plate 2c, and sealed with a sealant so that ink does not leak. Thus, a head chip is completed.

In the head chip completed in the above-described steps, after aging (ejection aging) of the heater, printing inspection is performed. In this print inspection, a predetermined pattern is printed on a test paper, and the size of each dot diameter, the variation (landing) of landing, and the like are inspected by image processing. At this time,
The position of the impact is also measured.

FIG. 4 is a diagram schematically showing the landing position measurement in the image processing apparatus, where X is the average value of the barycenter position of each landed dot in the main scanning direction, and Y is the first position of the head chip. Is the average value of the barycentric position in the nozzle row direction of the dot located at the position. This data is passed to the incorporation process into the next frame.

When the print inspection process is completed, the normal ink is once removed from the head chip and refilled with clear ink (ink without dye). This is to prevent the remaining ink from evaporating and sticking near the nozzle.

Next, a procedure for assembling the head chip 2 into the frame 1 will be described.

FIG. 5 is a perspective view of a frame constituting the ink jet head assembly shown in FIG.

First, as shown in FIG. 5, the adhesive 4 is applied to at least two or more locations per one head chip in the groove of the frame 1 in which the head chip 2 is to be incorporated. The adhesive 4 is preferably a material that is quick-curing and has some rigidity. In this embodiment, an epoxy UV-curable adhesive is used.

Next, the head chip 2 is inserted into the first groove 7 of the frame 1 using an automatic hand.

Here, the head chip 2 is mounted on the finger of the automatic hand by abutting it. At this time, the location where the finger abuts on the head chip 2 is set to be substantially the same as the abutment point of the head chip on the head chip fixing jig when printing on the head chip in the print inspection. This is to make effective use of the data of the impact point obtained during the previous print inspection.

FIGS. 6A and 6B show the structure of the head chip fixing jig. FIG. 6A is a view from the discharge port side of the head chip, and FIG. 6B is a side view of FIG. 7A and 7B show the configuration of the finger of the automatic hand. FIG. 7A is a view as viewed from the ejection port side of the head chip, and FIG. 7B is a side view of FIG.

In this embodiment, the head fixing jig 9 in the print inspection step shown in FIG.
As shown by 9d, positioning is performed at three points on the back surface and one point on the front surface of the base plate of the head chip. Positioning is performed at the front edge of the base plate as viewed from the ejection port side of the head chip.

On the other hand, the structure of the finger 10 shown in FIG. 7 is positioned at substantially the same position as the head chip fixing jig 9 in the print inspection step in the main scanning direction.

With respect to the nozzle arrangement direction and the ejection direction, a positioning block 11 fixed separately from the finger 10 is provided in order to avoid an obstacle when the head chip 2 is inserted into the frame body 1. After the positioning in the discharge direction is performed, the finger 10 is fixed. As a result, an effect almost equivalent to the positioning of the head chip in the print inspection process is obtained.

The head chip 2 thus positioned on the finger 10 is moved by the moving device 12 to the first position of the frame 1.
(See FIG. 5).

FIG. 8 shows the positional relationship between the head chip 2 and the groove of the frame 1 in which the head chip 2 is to be incorporated.

FIGS. 8A and 8B show the position of the head chip incorporated in the frame body. FIG. 8A is a schematic diagram viewed from the ejection surface side of the head chip, and FIG. 8B is viewed from the opposite side of FIG. It is a schematic diagram.

As shown in FIG. 8, the head chip 2 is
And is positioned without contacting the frame 1. This is because the frame 1 is a resin molded product and the accuracy is not so good, so that the position accuracy cannot be directly obtained by hitting the frame 1.

The moving position of the automatic hand may be taught so that the position of the head chip 2 with respect to the frame 1 is substantially at the center of the groove of the frame 1.

In this embodiment, the clearance between the base plate 2a of the head chip 2 and the walls on both sides of the groove is about 0.5 mm.
4 mm, and the clearance between the base plate 2a and the lower portion of the frame is set to about 0.2 mm. As a result, the lower portion of the base plate 2a contacts the adhesive 4 previously applied to the frame 1 as described above.

After the head chip 2 is set at a predetermined position by the automatic hand, an adhesive 13 is applied to the groove at the rear upper portion of the frame 1 and the gap between the base plate 2a as shown in FIG. 8B. The adhesive 13 is of the same type as the previously applied adhesive 4.

After that, the adhesive 4, 1 was irradiated with a UV irradiation device.
3 is cured.

At this time, UV light is applied to the front lower part and the rear lower part of the frame 1 through holes provided in the frame to pass the UV light. Since the upper rear portion of the frame 1 is open, the UV light may be irradiated as it is.

The finger 10 as shown in FIG. 7 fixes the head chip 2 until the irradiation of the UV light is completed and the adhesive is cured.

After the head chip 2 is fixed to the frame 1 via the adhesives 4 and 13 in this manner, the finger 10 as shown in FIG. Going to get it. The second head chip is also positioned by the fingers by the same means as the first head chip fixed to the frame 1 earlier than this, and the frame 1
In the second groove 8 (see FIG. 5).

In this embodiment, when the distance between the landing point of the first head chip and the landing point of the second head chip in the main scanning direction is 12.7 mm (1/2 inch), the main body (printer) is used. At the time of printing, the landing positions in the main scanning direction are set to exactly match.

In the print inspection step, the impact position of the first head chip in the main scanning direction is X1, the impact position of the second head chip in the main scanning direction is Y1, the impact position of the second head chip in the main scanning direction is X2, Assuming that the landing position in the direction is Y2, when the auto head is moved and fixed to the position of the teaching point of the first head chip + 12.7 mm, the landing point of both head chips in the main scanning direction is set. The interval deviates from the setting by (X2−X1).

Therefore, if the position of the auto hand in the main scanning direction with respect to the insertion position of the second head chip is set as [teaching point of the auto hand when the first head chip is inserted + 12.7 mm- (X2-X1)],
The interval between the landing positions of both head chips in the main scanning direction is always kept at a set value of 12.7 mm (１ ／ inch).

Next, the landing position of the first head chip and the landing position of the second head chip are shifted by (Y2-Y1) with respect to the nozzle direction.

In the present invention, in order to enable high-definition printing by shifting the landing position in the nozzle row direction, the landing position in the nozzle row direction of the second head chip is set in the nozzle row direction of the first head chip. By shifting the landing position by 分 pitch, printing can be performed so that the centers of gravity of the dots are arranged at equal intervals when printing is performed with both head chips as shown in FIG.

FIG. 9 is a view for explaining a printing state by the ink jet assembly of the present invention.

That is, as shown in FIG. 9, the position of the auto hand with respect to the nozzle row direction when the second head chip is inserted is set to [the teaching point of the auto hand when the first head chip is inserted + 0.0353 mm− ( Y2
−Y1)], the landing position of both head chips in the nozzle row direction is always 0.0353 mm (3 mm in the related art).
(Half the dot pitch of 60 dpi of 0.071 mm), and the dots landed by both head chips are arranged at an equal interval of 0.0353 mm when printing is performed in an overlapping manner. That is, printing at 720 dpi becomes possible.

The second head chip thus positioned is fixed to the frame in the same manner as the fixing of the first head chip.

Further, since the UV adhesive used in this embodiment can secure a certain degree of rigidity, the deviation due to the external pressure of the cured head chip is at a practically acceptable level. , The area around the adhesive is further protected by a silicon-based sealant.

The integrated frame and head chip assembled as described above are electrically connected to the main body (printer) from the rear of the frame as shown in FIGS. 1 and 2. The contact unit 3 for
Cover 5 for head chip protection and appearance from the top of the frame
To complete the head assembly.

The ink tank 6 shown in FIG. 2 has two ink supply holes on the same surface, and one ink tank 6 supplies the ink to both head chips.

Although two 360 dpi head chips are used in this embodiment, the ink ejection amount per dot of the 360 dpi head is originally 80 to 100 ng, and the ink ejection amount for 720 dpi printing is 20 to 25 ng.
ng.

To print at the same speed as in the past,
It is necessary to print at twice the ejection frequency. The ink discharge amount was achieved by reducing the nozzle diameter and the size of the heater to reduce the discharge energy.

Further, since the ejection amount at the ejection frequency is reduced to about イ ン ク, the refilling of the ink becomes relatively easy, and no special modification such as enlarging the ink supply path is required.

In addition, there was no problem with heat generation because the discharge energy was reduced.

(Second Embodiment) FIG. 10 is a perspective view showing a head chip used in a second embodiment of the ink jet assembly of the present invention, and FIG. 11 shows the arrangement of the head chip shown in FIG. FIG.

In the first embodiment, head chips of the same type are used and arranged in the same direction in the main scanning direction. However, as shown in FIGS. 10A and 10B, the ink supply tubes 14 are symmetrical. By making two types of simple head chips and arranging the base plates so as to face each other as shown in FIG. 11 and shortening the distance x between the nozzles of both heads, it is possible to shorten the moving distance for overlapping printing. As a result, the width of the main body in the main scanning direction could be reduced.

(Third Embodiment) FIG. 12 is a view showing the relationship between the arrangement of the head chips used in the third embodiment of the ink jet assembly of the present invention and the ink tank.

By arranging the two types of head chips in the second embodiment so that the ink supply ports are adjacent to each other, the ink supply port 15a of the ink tank 15 can be made one, and the ink tank The conventional device can be used for injecting ink into the device, and the production efficiency can be improved.

The present invention provides an excellent effect particularly in an ink jet recording head and a recording apparatus in which a flying liquid droplet is formed by utilizing thermal energy and recording is performed among ink jet recording methods.

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 can be applied to both the so-called on-demand type and continuous type. In particular, in the case of the on-demand type, liquid (ink)
By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise exceeding nucleate boiling to an electrothermal transducer arranged corresponding to the sheet or liquid path in which This is effective because heat energy is generated in the electrothermal transducer, causing film boiling on the heat-acting surface of the recording head, and as a result, air bubbles in the liquid (ink) corresponding one-to-one to this drive signal can be formed. It is. By discharging the liquid (ink) through the discharge opening by the growth and contraction of the bubble, at least one droplet is formed. 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 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. Further, if the conditions described in US Pat. No. 4,313,124 relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of the discharge port, the liquid path, and the electrothermal converter (linear liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned respective specifications, The present invention also includes a configuration using U.S. Pat. No. 4,558,333 and U.S. Pat. No. 4,459,600, which disclose a configuration in which a heat acting portion is arranged in a bending region.

In addition, JP-A-59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal converter for a plurality of electrothermal converters, or absorbs pressure waves of thermal energy. The present invention is also effective as a configuration based on JP-A-59-138461, which discloses a configuration in which an opening corresponds to a discharge unit.

Further, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length is determined by combining a plurality of recording heads as disclosed in the above specification. The present invention can exhibit the above-mentioned effects more effectively, though it may be either a configuration that satisfies the above requirements or a configuration as a single recording head that is formed integrally.

In the embodiments according to 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 at room temperature or is liquid, or In the above-described ink-jet method, it is general to control the temperature of the ink itself within a range of 30 ° C. or more and 70 ° C. or less so that the viscosity of the ink is in a stable ejection range. It is sufficient if the ink is in a liquid state.

In addition, the temperature rise due to thermal energy is positively prevented by using it as energy for changing the state of the ink from the solid state to the liquid state, or the ink is solidified in a standing state for the purpose of preventing evaporation of the ink. Either ink may be used, or in any case, the ink may be liquefied by application of heat energy according to the recording signal and ejected as a liquid ink, or may already start to solidify when reaching the recording medium. The use of an ink having a property of being liquefied for the first time by thermal energy is also applicable to the present invention. In such a case, the ink is disclosed in JP-A-54-5684.
No. 7 or Japanese Patent Application Laid-Open No. 60-71260, in which the porous sheet is opposed to the electrothermal converter while being held in a liquid or solid state in the concave portions or through holes of the porous sheet. It is good. 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 recording apparatus according to the present invention may be provided as an image output terminal of an information processing device such as a word processor or a computer as an integral or separate terminal, as well as a copying device combined with a reader, A facsimile apparatus having a transmission / reception function may be employed.

[0072]

As described above, in the ink jet head assembly of the present invention, when the head chips which can be produced by the conventional technique are landed in the direction in which the nozzles ejected from each head chip are arranged in the same direction, the dot spacing is obtained. A plurality of heads can be easily manufactured with high precision by disposing them at predetermined intervals and arranging them on the frame so as to be constant.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of an inkjet head assembly of the present invention.

FIG. 2 is a perspective view showing a configuration in which an ink tank is mounted on the inkjet head assembly shown in FIG.

FIG. 3 is an exploded perspective view of a head chip included in the inkjet head assembly shown in FIG.

FIG. 4 is a diagram schematically illustrating landing position measurement in the image processing apparatus.

FIG. 5 is a perspective view of a frame constituting the inkjet head assembly shown in FIG. 1;

6A and 6B show a configuration of a head chip fixing jig, wherein FIG. 6A is a diagram viewed from a discharge port side of a head chip,
(B) is a side view of (a).

7A and 7B show a configuration of a finger of an automatic hand, and FIG. 7A is a diagram viewed from a discharge port side of a head chip,
(B) is a side view of (a).

FIG. 8 shows a position of a head chip incorporated in a frame body, (a) is a schematic diagram viewed from a discharge surface side of the head chip,
(B) is a schematic diagram viewed from the opposite side of (a).

FIG. 9 is a diagram for explaining a printing state by the inkjet assembly of the present invention.

FIG. 10 is a perspective view showing a head chip used in a second embodiment of the ink jet assembly of the present invention.

FIG. 11 is a diagram showing an arrangement configuration of a head chip shown in FIG.

FIG. 12 is a view showing the relationship between the arrangement of a head chip used in a third embodiment of the ink jet assembly of the present invention and an ink tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Head chip 2a Base plate 2b Circuit board 2c Heater board 2d Slotted top plate 2e Pressing spring 2f Ink supply auxiliary member 3 Contact unit 4,13 Adhesive 5 Cover 6,15 Ink tank 7 First groove 8 Second Groove 9 head fixing jig 9a-9d positioning point 10 finger 11 positioning block 12 moving device 14 ink supply pipe 15a ink supply port

Continuation of the front page (72) Inventor Makiko Kimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Seiichiro Karita 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-2-204052 (JP, A) JP-A-63-37957 (JP, A) JP-A-64-40344 (JP, A) JP-A-4-344251 (JP, A) 59-99738 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41J 2/01 B41J 2/045-2/055 B41J 2/16 B41J 2/175 B41J 3/54

Claims (14)

(57) [Claims] 1. An ink jet head chip having a nozzle row in which a plurality of nozzles for ejecting ink are arranged so as to intersect in the main scanning direction is fixed to a frame in a plurality in a row in the main scanning direction. In the inkjet head assembly, each of the head chips is fixed to the frame by an adhesive at a predetermined distance from the frame so that the head chips are shifted in the nozzle arrangement direction at predetermined intervals. Characteristic inkjet head assembly. 2. Each of the head chips is fixed to the frame so that a dot interval is constant when landing is performed in a nozzle arrangement direction ejected from each of the head chips. The inkjet head assembly according to claim 1, wherein 3. The inkjet head assembly according to claim 1, wherein each of the head chips is of the same type. 4. Each of the head chips is provided with a respective one of the head chips.
Ink supply pipes for supplying ink to the
And the ink supply port of the ink supply tube is
Ink tank that holds the ink supplied to the
Are attached to the plurality of ink supply ports, respectively, and the one
Each of the head chips from each ink supply port of the ink tank
Ink is supplied via the respective ink supply pipes to the
The method according to any one of claims 1 to 3, wherein
On-board inkjet head assembly. 5. The head chip has two different structures.
The two types of head chips are provided with the plurality of nozzles.
Generate ink energy to eject ink from the
A base provided with a plurality of ejection energy generating elements
Rate, and apply ink to each of the head chips.
The same ink supply port side of the ink supply tube for supplying
So that the base plates face each other.
3. An arrangement according to claim 1, wherein
3. The inkjet head assembly according to claim 1. 6. An ink supply port of each of said ink supply pipes,
One holding ink supplied to each of the head chips
Attached to multiple ink supply ports of
From each ink supply port of the one ink tank.
To each head chip via each ink supply pipe
The ink according to claim 5, wherein ink is supplied.
Ink jet head assembly. 7. Each of the head chips has two different structures.
And the two types of head chips are
Ink supply tube for supplying ink to the
With the supply port in the same direction, the ink supply tube
The ink jet head assembly according to claim 1, wherein the supply ports are arranged adjacent to each other . 8. An ink supply of said adjacent ink supply pipe.
A mouth holds ink supplied to each of the head chips.
Attached to one ink supply port provided in the ink tank
And from one ink supply port of the ink tank
Ink is supplied to each head chip via the ink supply pipes.
The ink jet according to claim 7, which is supplied.
Assembly. 9. The two types of head chips are fixed to the frame so that a dot interval becomes constant when landing is performed in a direction in which nozzles are ejected from the two types of head chips. 9. The method according to claim 5, wherein
2. The inkjet head assembly according to claim 1. Wherein said frame body, in a position corresponding to each head chip, the inkjet according to any one of claims 1 to 9, characterized in that it has a groove for holding the adhesive Head assembly. 11. The inkjet head assembly according to claim 1, wherein the head chip includes an electrothermal converter for generating thermal energy for discharging ink. . 12. The head chip according to claim 11, wherein the head chip ejects the ink from each of the nozzles by using a film boiling generated in the ink by thermal energy applied by the electrothermal transducer. Inkjet head assembly. 13. A plurality of ink jet head chips each having a nozzle row in which a plurality of nozzles for ejecting ink are arranged so as to intersect in the main scanning direction are fixed to the frame in a row in the main scanning direction. In the method of assembling an inkjet head assembly, a step of positioning each of the head chips by shifting them in a nozzle arrangement direction at predetermined intervals without abutting on the frame, and between the head chip and the frame. Fixing the respective head chips to the frame at the predetermined intervals with an interposed adhesive. 14. The positioning step is a step of positioning the head chips such that the dot interval becomes constant when the landings in the nozzle arrangement direction ejected from the head chips are overlapped. The method of assembling an inkjet head assembly according to claim 13, wherein: