JP3928693B2 - Inkjet printer head and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a piezoelectric ink jet printer head and a manufacturing method thereof.
[0002]
[Prior art]
In a prior art on-demand type piezoelectric ink jet printer head, etc., as a method of fixing an ink jet head unit (hereinafter simply referred to as a head unit) in which nozzle rows are arranged in a direction perpendicular to the print direction to the main body frame of the head, First, in the Japanese Patent Application No. 2000-260616, the applicant of the present invention has formed an adhesive pouring hole exposed on the side edge of the head unit and the back surface of the protective cover plate in the bottom plate of the main body frame. A plurality of head units are arranged in parallel on the lower surface side, and a UV adhesive is suspended from the adhesive pouring hole to bond and fix the head unit and the protective cover plate to the bottom plate, while surrounding the protective cover plate. It was proposed that the bottom plate be bonded and fixed with a sealant.
[0003]
By the way, this protective cover plate is provided with an opening window surrounding the nozzle row, and this protective cover plate is for protecting the nozzle and the surface in the vicinity thereof so that printing paper or the like does not come into direct contact therewith. In addition, the wiper blade for wiping the nozzle surface to remove the ink fountain and dust adhering to the nozzle and the vicinity thereof is also a place where the wiper blade slides.
[0004]
As described above, the protective cover plate is provided with the opening window as described above, and the nozzle row on the inner diameter side of the opening window is a place wetted with ink, and supplied from the bottom plate side. Since the portion where the head unit and the protective cover plate are adhered and sealed by the UV adhesive is partially sealed, the ink is discharged from the gap between the back surface of the protective cover plate and the front surface of the head unit at the outer peripheral portion of the opening window. If it soaks due to capillary action and reaches the electrical contact of the piezoelectric actuator part on the back side of the head unit, an electrical short circuit accident occurs. In order to eliminate this inconvenience, conventionally, a sealing agent (adhesive) is applied so as to surround the outer peripheral portion of the opening window on the back surface of the protective cover plate to prevent ink permeation. .
[0005]
[Problems to be solved by the invention]
However, when the bonding operation using the UV adhesive and the bonding operation using the sealing agent are performed substantially simultaneously, a portion where the UV adhesive and the sealing agent are solidified before solidification occurs, and solidification at that portion is caused. There was a problem that a part where the seal was incomplete occurred.
[0006]
It is a technical object of the present invention to provide an ink jet printer head that solves such problems.
[0007]
[Means for Solving the Problems]
In order to achieve the technical problem, the invention according to claim 1 is a protective cover plate having a head unit having a plurality of nozzles arranged in a row on the front surface and an opening window surrounding the nozzle row. Is fixed to the lower surface of the bottom plate of the main body frame with a first adhesive, and the outer peripheral portion of the opening window between the head unit and the protective cover plate is fixed with a second adhesive. In the head, the bottom plate is provided with a first adhesive pouring hole exposed on a side edge of the head unit and a back surface of the protective cover plate, and on the front surface of the head unit or the back surface of the protective cover plate, the first plate is formed. A reservoir groove is formed to prevent the adhesive No. 2 from leaking in the direction of the first adhesive pouring hole.
[0008]
According to a second aspect of the present invention, in the inkjet printer head according to the first aspect of the present invention, one or a plurality of the collecting grooves extending in the row direction of the nozzles are formed on the front surface of the head or the back surface of the protective cover plate. Is formed as a dent.
[0009]
On the other hand, in the method of manufacturing an ink jet printer head according to claim 3, a head unit having a plurality of nozzles arranged in a row on the front surface and a protective cover plate having an opening window surrounding the nozzle rows. Are fixed to the lower surface of the bottom plate of the main body frame of the ink jet printer head with a first adhesive, and the head unit and the protective cover plate are fixed to the outer peripheral portion of the opening window with the second adhesive. In the way to A second adhesive is applied so as to surround the opening window on the side closer to the nozzle row than the pool groove formed in the front surface of the head unit or the back surface of the protective cover plate, and then the nozzle row is After positioning the head unit and the protective cover plate so as to be exposed from the opening window at regular intervals, the front surface of the head unit and the back surface of the protective cover plate are fixed with the second adhesive, Next, the lower surface of the bottom plate of the main body frame is placed on the fixed head unit, and then, from the first adhesive flow hole formed in the bottom plate, the side edge of the head unit and the back surface of the protective cover plate Supplying and curing the first adhesive fixes the main body frame, the head unit, and the protective cover plate. It is characterized by this.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1, 2, and 3 are perspective views of a piezoelectric inkjet printer head according to an embodiment of the present invention, FIG. 5 is a front view of the head unit, and FIG. 6 is a diagram of the first adhesive and the second adhesive. FIG. 7 is a cross-sectional view of a main part showing a bonding completion state of the bottom plate, the head unit, and the protective cover plate.
[0011]
As shown in FIGS. 1 to 7, the ink jet printer head according to the present invention includes a main body frame 1 made of an injection-molded product of synthetic resin material such as polypropylene and polypropylene, and 2 arranged in parallel on the lower surface side of the bottom plate 5. Two head units 6, 6 and protective windows fixed to the surface of the head units 6, 6 and the main body frame 1, with opening windows 57, 57 so that the nozzle rows on the surface of each head unit 6 are exposed. A cover plate 44 is included.
[0012]
The main body frame 1 is formed in a substantially box shape having an open top surface, and has a mounting portion 3 to which four ink cartridges 2 as ink supply sources can be detachably mounted from above, and one side of the mounting portion 3 Ink supply passages 4 a, 4 b, 4 c, 4 d that can be connected to an ink discharge portion (not shown) of each ink cartridge 2 communicate with the lower surface of the bottom plate 5 of the main body frame 1.
[0013]
The bottom plate 5 is formed in a horizontal shape so as to protrude one step downward from the mounting portion 3, and two head units 6 to be described in detail later are in contact with the bottom surface of the bottom plate 5 in parallel. Two support portions 8 and 8 are formed in a stepped shape. As shown in FIGS. 4 and 9, openings 50, 50, 50, 50 corresponding to the ink supply passages 4a, 4b, 4c, 4d are provided in one side portion of the support portions 8, respectively. A substantially annular fitting groove 46 is recessed so as to surround the outer periphery of each opening 50.
[0014]
Then, a ring-shaped packing 47 having a good sealing property such as soft rubber is fitted into each fitting groove 46 (see FIGS. 2 and 9).
[0015]
In addition, a plurality of pouring holes 9a and 9b for the UV adhesive 7 as a fast-curing first adhesive are formed in each support portion 8 and 8 of the bottom plate 5 so as to penetrate vertically. The UV cover 7 supplied from the casting holes 9a and 9b fixes the head unit 6 and the protective cover plate 44 that covers the front unit 6 except for the nozzle plate 43 on the front surface thereof.
[0016]
When the head unit 6 is fixed to the stepped support portions 8 and 8, an appropriate gap space 9 c is formed between the flexible flat cable 40 on the back surface thereof.
[0017]
As shown in FIGS. 2, 6, and 7, the plurality of casting holes 9 a and 9 b are formed at locations where the side portions near the four corners are fixed to one head unit 6. In the embodiment, in a place where one side (long side in the embodiment) of the two support portions 8 and 8 is adjacent to the back surface of the two head units 6 and 6 arranged side by side and the back surface of the protective cover plate 44. The pouring holes 9a and 9a are formed wide so that they are exposed across.
[0018]
A rubber-made packing 53 (see FIG. 3) is arranged on the upper surface of the one side portion 3a of the mounting portion 3 so as to be in close contact with the ink discharge portion.
[0019]
Next, the configuration of the front surface of the head unit 6 will be described. As shown in FIGS. 2, 5, 11, 12, and 13, a nozzle 54 is provided at the center of the front surface (lower surface) of the cavity plate 10. A thin plate-like nozzle plate 43 made of synthetic resin or the like is fixed (pasted) with an adhesive. As will be described later, 75 nozzles 54 are arranged in a staggered pattern in two rows (see FIGS. 11 and 12), and eject ink downward (see FIG. 13). A known water repellent film is formed on the front surface of the nozzle plate 43.
[0020]
On the other hand, the protective cover plate 44 for protecting the front side of the two head units 6, 6 is made of a thin metal plate and has an appropriate gap with respect to the outer peripheral edge of the nozzle plate 43 in each head unit 6. Two opening windows 57 and 57 are formed by press working so as to surround the dimension (see FIGS. 2 and 3) with a space therebetween. The protective cover plate 44 surrounds the outer peripheral portion of each opening window 57 with respect to the front surface (lower surface) of the head unit 6 and has a second adhesive 56 such as silicone having ink sealability (see FIGS. 6 and 6). 7), and is fixed and bonded (pasted) in a liquid-sealed state. The thickness of the protective cover plate 44 is preferably slightly thicker than the nozzle plate 43.
[0021]
In that case, the front surface of each head unit 6 (the front surface of the manifold plate 12) or the back surface of the protective cover plate 44 is a portion closer to the outer periphery than the outer peripheral edge of each opening window 57, and the pouring holes 9a and 9b. One or a plurality of recess grooves 60 are formed on the inner peripheral side of the position so as to prevent the second adhesive 56 from being mixed with the first adhesive 7. In the embodiment, as shown in FIG. 5, the front surface of the lower manifold plate 12 in the head unit 6, outside the region 43 a to which the nozzle plate 43 is bonded, and the row of nozzles 54 in the nozzle plate 43, It is formed long along the row of the through passages 17. As shown in FIG. 5, the front surface of the lower manifold plate 12 is formed with a plurality of concave portions 58 and 59 having a round shape in plan view in the region 43a, and the adhesive applied to the region 43a. When an unillustrated (not shown) extends with a pressing force with the nozzle plate 43, the excess adhesive can escape into the recesses 58 and 59.
[0022]
In addition, when the nozzle plate 43 is bonded and fixed to the front surface of the lower manifold plate 12 in the region 43a and in the front and rear portions of the row of the through passages 17, the plurality of head units 6 and 6 are arranged in parallel. Positioning holes 61a and 62a are formed when the adhesive frame is fixed to the bottom position of the main body frame 1. The positioning holes 61a and 62a are positioned to coincide with the positioning holes 61 and 62 in the nozzle plate 43 in FIG.
[0023]
Next, a method of fixing the head unit 6 and the protective cover plate 44 to the main body frame 1 will be described. The protective cover plate 44 made of the above-described thin metal plate in which the opening windows 57 and 57 are formed is positioned for positioning. The second adhesive 56 is applied on the jig 63 (see two points in FIG. 7) so as to surround the outer peripheral portion of each opening window 57 on the back surface of the protective cover plate 44 (FIG. 6). reference).
[0024]
Next, the positioning holes 61 and 62 in the nozzle plate 43 are fitted into two positioning pins 64 (only one is shown in FIG. 7) in the jig 63 so that the two nozzle plates 43 are exposed from the opening window 57. Are arranged so that the distance between the rows of nozzles 54 in both head units 6 and 6 is constant and parallel, and the front surface of each head unit 6 and the back surface of the protective cover plate 44 are second bonded. The adhesive is fixed with the agent 56. The main body frame 1 is put on them, the head units 6 and 6 are made to correspond to the positions of the support portions 8 and 8, and the UV adhesive 7 as the first adhesive is poured into the casting holes 9 a and 9 b. To cure the UV adhesive 7 and fix the positions of the two head units 6 and 6 at a time.
[0025]
In this way, as shown in FIG. 7, the second adhesive 56 is pushed and spread in a thin layer between the front surface of the manifold plate 12 and the back surface of the protective cover plate 44 by the pressing force. It is blocked at the location of the accumulation groove 60, and it becomes difficult to leak in the outer peripheral direction. On the other hand, the UV adhesive 7, which is the first adhesive, also travels along the side edge from the back surface of each head unit 6 and flows through the gap with the back surface of the protective cover plate 44 in the inner peripheral direction of the opening window 57. However, it does not flow much due to the instantaneous solidification of the UV adhesive 7. Even if it flows in the inner peripheral direction of the opening window 57, if a plurality of the accumulation grooves 60 are formed, the occurrence of a place where the first adhesive 7 and the second adhesive 56 are mixed is surely prevented. it can.
[0026]
By mixing different types of adhesives, the solidification phenomenon will not occur and uncured parts will occur, and it will be possible to prevent accidents such as electrical short circuits due to ink leakage later. is there.
[0027]
The pouring holes 9a and 9b are disposed, for example, in the vicinity of the four corners of the head unit 6 having a rectangular shape in plan view, so that when the UV adhesive 7 is solidified, the head unit 6 is displaced due to shrinkage distortion of the adhesive. Can be reduced as much as possible. As shown in FIG. 4 and FIG. 5, when the pouring hole 9a is formed wide across the adjacent sides of the head units 6 and 6 arranged in parallel, the UV adhesive 7 is formed in one pouring hole 9a. The two units 6 and 6 can be solidified at a time by irradiating with ultraviolet rays, which can contribute to shortening the working time and greatly improving the production efficiency.
[0028]
Further, by solidifying the vicinity of the four corners of the head unit 6, the front surface of the head unit 6 is covered with a cap made of rubber or the like for preventing the nozzle portion from being dried when the inkjet head is not mounted in the printer later. There is an advantage that deformation that causes distortion of the plane of the cavity plate 10 is less likely to occur when pressed so as to be in close contact.
[0029]
Further, as shown in FIGS. 8 and 9, a sealant 45 is applied between the outer periphery of the protective cover plate 44 and the main body frame 1. In addition, between the flexible flat cable 40 and the main body frame 1, between the flexible flat cable 40 and the protective cover plate 44, and between the corner portion of the bent portion 44 b of the protective cover plate 44 and the main body frame 1, Before the main body frame 1 is put on the head unit 6, a sealing agent 45 is applied in advance. As a result, the piezoelectric actuator and the electrical joint of the head unit 6 are completely sealed with respect to the outside, and ink, paper dust, dust and the like are prevented from entering from the outside.
[0030]
Next, details of the head unit 6 and its components will be described. As shown in FIGS. 10 to 13, the head unit 6 includes a plurality of metal plate laminated cavity plates 10, and an adhesive or an adhesive sheet 41 (see FIG. 13) for the cavity plates 10. A plate-type piezoelectric actuator 20 that is bonded and laminated via a flexible flat cable 40 is overlapped and bonded to an external device on the upper surface thereof.
[0031]
Further, as will be described later, the upper surface of the supply hole 19a formed in one end of the uppermost base plate 14 on the back surface side of the head unit 6 is filled with the ink supplied from the ink cartridge 3 thereabove. A filter 29 for dust removal is fixed in advance with an adhesive (see FIGS. 10 and 11). When the cavity plate 10 is assembled to the main body frame 1, the supply hole 19a abuts the periphery of the packing 47 and communicates with the ink supply passage 4a.
[0032]
The cavity plate 10 is configured as shown in FIGS. In other words, the four thin metal plates of the manifold plate 12, the spacer plate 13, and the base plate 14 are each overlapped and bonded with an adhesive, and in the embodiment, each plate excluding the nozzle plate 43 is 42% It is made of a nickel alloy steel plate and has a thickness of about 50 μm to 150 μm.
[0033]
A nozzle plate 43 is bonded to the lower manifold plate 12, and a large number of through passages 17 communicating with the nozzles 54 are arranged in the first direction (long side direction) of each of the upper and lower manifold plates 12 and the spacer plate 13. It is provided at a constant pitch in a zigzag array in two rows. In addition, ink passages 12 a and 12 b are formed in the two manifold plates 12 so as to extend along both sides of the row of the through holes 17. However, the ink passage 12b in the lower manifold plate 12 is recessed so as to open only to the upper side of the manifold plate 12 (see FIG. 12). The ink passages 12 a and 12 b are sealed by stacking the spacer plate 13 on the upper manifold plate 12.
[0034]
The base plate 14 is provided with a plurality of narrow pressure chambers 16 extending in a second direction (short side direction) perpendicular to the center line along the long side (first direction). Has been. And when the parallel longitudinal reference lines 14a, 14b are set on both the left and right sides with the center line in between, the tip 16a of the pressure chamber 16 on the left side of the center line is located on the left reference line 14a, Conversely, the tip 16a of the pressure chamber 16 on the right side of the longitudinal center line is positioned on the right reference line 14b on the right side, and the tips 16a of the left and right pressure chambers 16 are alternately arranged. The pressure chambers 16 are alternately arranged so that every other pressure chamber 16 extends in the opposite direction.
[0035]
The front end 16a of each pressure chamber 16 communicates with the spacer plate 13 and both manifold plates 12 through through passages 17, 17, 17 that are similarly drilled in a staggered arrangement. On the other hand, the other end 16 b of each pressure chamber 16 communicates with the ink passages 12 a and 12 b in both the manifold plates 12 through through holes 18 drilled in the left and right side portions of the spacer plate 13. As shown in FIGS. 12 and 13, the other end 16 b of each pressure chamber 16 is recessed so as to open only on the lower surface side of the base plate 14.
[0036]
As a result, ink that has flowed into the ink passages 12a and 12b from the supply holes 19a and 19b drilled in one end of the base plate 14 and the spacer plate 13 passes through the through holes 18 from the ink passage 12a. After being distributed in each pressure chamber 16, the pressure chamber 16 passes through the through passages 17, 17, 17 and reaches the nozzle 54 corresponding to the pressure chamber 16 (see FIG. 11).
[0037]
On the other hand, as shown in FIG. 13, the piezoelectric actuator 20 has a structure in which a plurality of piezoelectric sheets 21 are stacked. As described in JP-A-4-341851, the piezoelectric actuator 20 has the lowest stage. On the upper surface (wide surface) of the piezoelectric sheet 21 and the odd-numbered piezoelectric sheet 21 counted upward, narrow individual electrodes (not shown) are formed for each of the pressure chambers 16 in the cavity plate 10. Has been. A common electrode (not shown) common to the plurality of pressure chambers 16 is formed on the upper surface (wide surface) of the even-numbered piezoelectric sheet 21 from the bottom. On the upper surface of the uppermost top sheet, along the edge of the long side, the surface electrode 30 electrically connected to each of the individual electrodes, and the surface electrode 30 electrically A connected surface electrode is provided (see FIG. 10).
[0038]
The plate-type piezoelectric actuator 20 having such a configuration is such that each individual electrode in the piezoelectric actuator 20 corresponds to each pressure chamber 16 in the cavity plate 10 with respect to the cavity plate 10. Laminated and fixed. Further, when the flexible flat cable 40 is pressed against the upper surface of the piezoelectric actuator 20, various wiring patterns (not shown) in the flexible flat cable 40 become the surface electrodes 30, 31. Electrically joined to the
[0039]
In this configuration, by applying a voltage between any individual electrode of the individual electrodes in the piezoelectric actuator 20 and the common electrode, the piezoelectric sheet is piezoelectrically applied to a portion corresponding to the individual electrode to which the voltage is applied. Due to this, distortion in the stacking direction occurs, and the internal volume of the pressure chamber 16 corresponding to each individual electrode is reduced by this distortion, so that the ink in the pressure chamber 16 is ejected from the nozzle 54 in the form of droplets. Then (see FIG. 13), predetermined printing is performed.
[0040]
The number of head units to be arranged in parallel can be arbitrarily configured as 2 to 4, and the cavity plate in the head unit may be a ceramic material in addition to a metal material. Further, the driving means of the ink jet printer of the present invention may be other types of the plate-like piezoelectric actuator 20 described above, or the vibration plate covering the back surface of the pressure chamber is vibrated by static electricity so that ink is ejected from the nozzles 54. It is also possible to have a configuration in which the liquid is discharged from the liquid.
[0041]
[Operation and effect of the invention]
As described above, the invention described in claim 1 includes a head unit having a plurality of nozzles arranged in a row on the front surface, and a protective cover plate having an opening window surrounding the nozzle row. In an ink jet printer head, which is fixed to the lower surface of the bottom plate of the main body frame via a first adhesive, and the outer peripheral portion of the opening window between the head unit and the protective cover plate is fixed with a second adhesive. The bottom plate is formed with a first adhesive pouring hole exposed on the side edge of the head unit and the back surface of the protective cover plate, and the second surface is formed on the front surface of the head unit or the back surface of the protective cover plate. A reservoir groove is formed to prevent the adhesive from leaking in the direction of the first adhesive pouring hole.
[0042]
With this configuration, when the first adhesive and the second adhesive are different and are not solidified, the first adhesive is supplied from the pouring hole, and the bottom plate of the main body frame, the head unit, and the protective cover Even if the operation of adhering and fixing the three members with the plate and the operation of adhering and fixing the two members of the head unit and the protective cover plate with the second adhesive are performed at the same time, the second adhesive is provided by the pool groove. Since it is prevented from clogging and mixing with the first adhesive can be surely prevented, and an uncured portion of the adhesive cannot be formed, ink leaks later from the front surface of the head unit through the gap between the back surface of the protective cover plate. It is possible to reliably prevent this phenomenon.
[0043]
According to a second aspect of the present invention, in the inkjet printer head according to the first aspect of the present invention, one or a plurality of the collecting grooves extending in the row direction of the nozzles are formed on the front surface of the head or the back surface of the protective cover plate. Is formed as a dent. Thus, if a long accumulation groove is formed along the nozzle row, the front surface of the adjacent head unit can be used even when a plurality of head units are arranged in parallel so that the nozzle rows are parallel to each other. While securing the sealing performance by the second adhesive to the back surface of the protective cover plate at the location, there is an effect that the three-sided fixing of the side edge of the adjacent head unit, the back surface of the protective cover plate, and the bottom plate can be reliably performed. .
[0044]
On the other hand, in the method of manufacturing an ink jet printer head according to claim 3, a head unit having a plurality of nozzles arranged in a row on the front surface and a protective cover plate having an opening window surrounding the nozzle rows. Are fixed to the lower surface of the bottom plate of the main body frame of the ink jet printer head with a first adhesive, and the head unit and the protective cover plate are fixed to the outer peripheral portion of the opening window with the second adhesive. In the way to A second adhesive is applied so as to surround the opening window on the side closer to the nozzle row than the pool groove formed in the front surface of the head unit or the back surface of the protective cover plate, and then the nozzle row is After positioning the head unit and the protective cover plate so as to be exposed from the opening window at regular intervals, the front surface of the head unit and the back surface of the protective cover plate are fixed with the second adhesive, Next, the lower surface of the bottom plate of the main body frame is placed on the fixed head unit, and then, from the first adhesive flow hole formed in the bottom plate, the side edge of the head unit and the back surface of the protective cover plate Supplying and curing the first adhesive fixes the main body frame, the head unit, and the protective cover plate. It is characterized by this. As described above, when the first adhesive and the second adhesive are bonded and fixed in this manner, even if the locations of the two adhesives are close to each other, one adhesive is blocked at the location of the pool groove. Adhesives do not mix with each other, uncured parts of the adhesive are not created, and the phenomenon that ink leaks later through the gap between the front surface of the head unit and the back surface of the protective cover plate can be reliably prevented Play.
[Brief description of the drawings]
FIG. 1 is a perspective view with the nozzle side of an inkjet printer head according to an embodiment of the present invention facing up.
FIG. 2 is an exploded perspective view of components of the ink jet printer head.
FIG. 3 is an exploded perspective view of components of the ink jet printer head viewed from above the main body frame.
FIG. 4 is a view of the bottom plate of the main body frame as viewed from the lower surface side.
FIG. 5 is a partially cutaway view in which the lower surface of the head unit is enlarged.
FIG. 6 is an enlarged cross-sectional view of a main part showing a bonding operation between a main body frame, a head unit, and a protective cover plate.
7 is an enlarged cross-sectional view showing a bonding portion of the main body frame, the head unit, and the protective cover plate as seen in the direction of arrows VII-VII in FIG. 4;
8 is an enlarged cross-sectional view taken along the line VIII-VIII in FIG.
9 is an enlarged cross-sectional view taken along the line IX-IX in FIG. 4;
FIG. 10 is a perspective view of each component of the head unit.
FIG. 11 is a perspective view of each component of the cavity plate.
FIG. 12 is a partially enlarged perspective view of a cavity plate.
FIG. 13 is an enlarged side sectional view of the head unit.
[Explanation of symbols]
1 Body frame
5 Bottom plate
6 Head unit
7 UV adhesive as first adhesive
9a, 9b Pour hole
10 Cavity plate
12, 12 Manifold plate
13 Spacer plate
14 Base plate
17 Throughway
20 Piezoelectric actuator 20
40 Flexible cable
43 Nozzle plate
44 Protective cover plate
54 nozzles
56 Second adhesive
57 Open window
60 pool groove

Claims (3)

A head unit having a plurality of nozzles arranged in a row on the front surface and a protective cover plate having an opening window surrounding the nozzle rows are fixed to the lower surface of the bottom plate of the main body frame via a first adhesive. In addition, in the inkjet printer head formed by fixing the head unit and the protective cover plate to the outer peripheral portion of the opening window with a second adhesive,
The bottom plate is provided with a first adhesive pouring hole exposed on the side edge of the head unit and the back surface of the protective cover plate,
An ink jet printer characterized in that a reservoir groove for preventing the second adhesive from leaking in the direction of the first adhesive flow hole is formed on the front surface of the head unit or the back surface of the protective cover plate. head.   2. The ink jet printer head according to claim 1, wherein one or a plurality of the accumulation grooves extending in the row direction of the nozzles are formed in a recess on a front surface of the head or a back surface of the protective cover plate. A head unit having a plurality of nozzles arranged in a row on the front surface and a protective cover plate having an opening window surrounding the nozzle rows are attached to the lower surface of the bottom plate of the main body frame of the ink jet printer head. And fixing the head unit and the protective cover plate to the outer peripheral portion of the opening window with a second adhesive,
Applying a second adhesive so as to surround the opening window on the side closer to the nozzle row than the accumulation groove formed in the front surface of the head unit or the back surface of the protective cover plate,
Next, after positioning the head unit and the protective cover plate so that the nozzle row is exposed from the opening window at a predetermined interval, the front surface of the head unit and the back surface of the protective cover plate are connected to the second surface. Fix with adhesive,
Next, the lower surface of the bottom plate of the main body frame is placed on the fixed head unit, and then, from the first adhesive flow hole formed in the bottom plate, the side edge of the head unit and the back surface of the protective cover plate A method of manufacturing an ink jet printer head, comprising: fixing a main body frame, the head unit, and a protective cover plate by supplying and curing a first adhesive .

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