JP6801441B2 - Head position adjustment mechanism, liquid discharge unit and liquid discharge device - Google Patents

Description

The present invention relates to a head position adjusting mechanism for a liquid discharge head, a liquid discharge unit, and a liquid discharge device.

A liquid discharge unit in which a plurality of liquid discharge heads are mounted on the same substrate (plate) is already known, and a liquid discharge device (such as an inkjet printer) including the liquid discharge unit is also already known.

In order to improve the printing productivity of an inkjet printer, there is a method in which a plurality of heads for the same color are arranged in the longitudinal direction and used as one head. In order to accurately eject ink from a plurality of heads, it is necessary to strictly adjust the position (adjustment of the linear direction and the angle (posture)) between the heads. However, in the case of a plurality of heads, the linear direction and the adjustment of the angle are influenced by each other, so that there is a problem that it is complicated to adjust both accurately.

In order to solve this problem, for example, in Patent Document 1, an inkjet printer having the following configuration is provided for the purpose of easily and accurately adjusting the position of the recording head even when a plurality of recording heads for the same color are used. It is disclosed. The inkjet printer is provided with a head position adjusting mechanism for adjusting the position of the recording head with respect to the transport direction, and the head position adjusting mechanism is parallel to the main scanning direction and with respect to the main scanning direction and the transport direction of the recording head. A cam member that has an inclined surface inclined in the vertical direction and can move in the vertical direction, a butt member that comes into contact with the cam member and can move in the transport direction as the cam member moves in the vertical direction, and a recording head. A support member for supporting and an urging member for pressing and fixing the recording head against the support member and the abutting member are provided.

Since this inkjet printer adjusts the angular position of the head and the position in the sub-scanning direction by independent mechanisms, it has a structure that is not geometrically influenced by each other. Therefore, it can be expected that the position of the recording head can be adjusted easily and accurately.

However, the inkjet printer described in Patent Document 1 has a problem that the degree of freedom regarding the arrangement of the recording head is limited because the adjustment mechanism cannot be reduced due to its structure.

Therefore, an object of the present invention is to provide a head position adjusting mechanism in which the positions and angles of a plurality of liquid discharge heads can be adjusted without affecting each other and the mechanism itself is compact.

The first problem is a head position adjusting mechanism for adjusting the positions of a plurality of liquid discharge heads arranged on a head plate, which is arranged on the head plate and holds the liquid discharge heads in pairs. A second bracket, a first movable member provided on the first bracket and capable of moving the liquid discharge head in one direction, and a first movable member provided on the second bracket to direct the liquid discharge head toward the first movable member. The first elastic member to be urged, a rotation support portion serving as a rotation fulcrum around the normal line of the liquid discharge surface of the liquid discharge head, and the first bracket provided to support the liquid discharge head. In a head position adjusting mechanism including a second movable member that rotates around a portion and a second elastic member that urges the liquid discharge head toward the second movable member, between the liquid discharge heads that are adjacent to each other. The first and second brackets are intermediate between the first and second movable members used for one of the liquid discharge heads and the first elastic member used for the other liquid discharge head. It is solved by a head position adjusting mechanism characterized by being configured as a bracket.

Since the head position adjusting mechanism of the present invention has a configuration in which the intermediate brackets adjust the liquid discharge heads adjacent to each other, the mechanism itself can be made compact. Therefore, the degree of freedom in arranging the liquid discharge head can be improved.

(A) is a schematic plan view showing a basic configuration of a head position adjusting mechanism, and (b) is a schematic cross-sectional view at the position of line AA of (a). (A) is a schematic plan view showing the head position adjusting mechanism according to the first embodiment, and (b) is a schematic cross-sectional view at the position of line AA of (a). It is a schematic plan view which shows the head position adjustment mechanism which concerns on 2nd Embodiment. 2 (a) and 3 are schematic cross-sectional views taken along the line AA. It is a top view which shows the main part of the liquid discharge device which concerns on one Embodiment of this invention. It is a side view which shows the main part of the liquid discharge device which concerns on one Embodiment of this invention. It is a top view which shows the main part of the liquid discharge unit which concerns on another embodiment. It is a top view which shows the main part of the liquid discharge unit which concerns on still another Embodiment.

FIG. 1A is a schematic plan view showing a basic configuration of a head position adjusting mechanism, and FIG. 1B is a schematic cross-sectional view taken along the line AA of FIG. 1A. A head position adjusting mechanism capable of adjusting the position and angle of a single liquid discharge head without affecting each other will be described with reference to FIG.

As shown in FIG. 1A, the head position adjusting mechanism 1a has a first bracket 11 and a second bracket 12 provided on the head plate 10. The first and second brackets hold the head 15, which is a liquid discharge head, in pairs. The first bracket 11 is provided with a first movable member 13 capable of moving the head 15 in one direction (secondary scanning direction), and the second bracket 12 urges the head 15 toward the first movable member 13. A first elastic member 14, made of rubber, for example, is provided. These are used to adjust the position of the head 15 in the sub-scanning direction.

Further, the head position adjusting mechanism 1a is located on the opposite side of the rotation support portion 16 which becomes a rotation fulcrum when adjusting the angle of the head 15 and the rotation support portion 16 via the head 15, for example, a second elastic made of rubber. It has a member 17. Further, the first bracket 11 is provided with a second movable member 18 that rotates the head 15 around the rotation support portion 16. The second movable member 18 rotates the head 15 around the rotation support portion 16, and at the same time, the head 15 is urged toward the second movable member 18 by the second elastic member 17. These are used to rotate the head 15 and adjust the angle of its liquid discharge surface around the normal.

As shown in FIG. 1B, the first bracket 11 has a cylindrical storage portion 19 for storing the first movable member 13 and a screw hole portion 20 leading to the storage portion 19. An adjusting screw 21 is provided in the screw hole portion 20 so as to be screwable. It is desirable that the first movable member 13 has a spherical shape and the tip of the adjusting screw 21 has a conical shape. As the adjusting screw 21 is screwed into the first bracket 11, the tip (cone) of the adjusting screw 21 smoothly pushes the first movable member 13 out of the accommodating portion 19. Therefore, the position of the head 15 can be adjusted with high accuracy in the sub-scanning direction.

Further, the second movable member 18 of the first bracket 11 has the same configuration (corresponding adjusting screw 22, storage portion, etc.). As the adjusting screw 22 is screwed in, the second movable member 18 is smoothly pushed out from the storage portion. Therefore, it is possible to perform highly accurate angle adjustment around the rotation support portion 16 of the head 15.

Subsequently, a method of adjusting the position of the head position adjusting mechanism 1a will be described. As the position adjustment, the nozzle row of the head 15 is made perpendicular to the main scanning direction, and the nozzle row is positioned in the sub scanning direction.

First, the adjusting screw 22 rotates the head 15 clockwise (or counterclockwise) around the rotation support portion 16 to adjust the nozzle row of the head 15 so that it is perpendicular to the main scanning direction (angle adjustment). .. Next, the adjusting screw 21 moves the head 15 in the sub-scanning direction (or vice versa) (position adjustment).

Here, the head 15 whose angle has been adjusted first is supported by the rotation support portion 16, the second movable member 18, and the second elastic member 17, and the rotation angle (posture) thereof is the second movable member 18, It is determined by two points that come into contact with the rotation support portion 16. Therefore, even if the head 15 is moved in the sub-scanning direction (or the opposite direction) by the first movable member 13, the rotation angle (posture) of the head 15 is maintained (translation). Therefore, the head position adjusting mechanism 1a can independently adjust the position and angle of the head 15 in the sub-scanning direction.

The arrangement of the first and second movable members 13, 18, the first and second elastic members 14, 17, and the rotation support portion 16 is not limited to the form shown in FIG. 1 (a). The first movable member 13 and the first elastic member 14 may be arranged on one side surface of the head 15, respectively, and the rotation support portion 16 and the second movable member 18 may be arranged on the other side surface of the head 15.

Next, a head position adjusting mechanism capable of adjusting the positions and angles of adjacent liquid discharge heads without affecting each other and making the mechanism itself compact will be described.

(First Embodiment)
FIG. 2A is a schematic plan view showing the head position adjusting mechanism according to the first embodiment, and FIG. 2B is a schematic cross-sectional view taken along the line AA of FIG. 2A. In FIG. 2, the same objects as those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 2, the head position adjusting mechanism 1b adjusts the positions of two heads 15a and 15b arranged in a row, and has an intermediate bracket 24 between a plurality of adjacent heads. The feature of the intermediate bracket 24 is that the first movable member 13 and the second movable member 18 for adjusting the position and angle of the head 15a in the sub-scanning direction are provided, and the position of the head 15b in the sub-scanning direction is adjusted. A first elastic member 14 for this purpose is also provided.

Since the heads 15a and 15b are adjusted by independent head position adjusting mechanisms as described in FIG. 1 above, the positions and angles of the heads 15a and 15b do not affect each other in this embodiment as well. It is adjustable. Further, since the intermediate bracket 24 also serves as the first bracket 11 and the second bracket 12, the adjustment mechanism itself can be made compact.

In the present embodiment, the positions of the two heads 15a and 15b arranged in a row are adjusted, but the present invention is not limited to this. The same applies to three or more heads arranged in a row.

(Second Embodiment)
FIG. 3 is a schematic plan view showing the head position adjusting mechanism according to the second embodiment. In FIG. 3, the same objects as those in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 3, the head position adjusting mechanism 1c adjusts the positions of the two heads 15a and 15b arranged in a row and the heads 15c arranged in parallel with the heads 15a and 15b. Therefore, an intermediate bracket 25 is provided between the three adjacent heads. The intermediate bracket 25 is characterized in that the intermediate bracket 24 described in the first embodiment further includes a third elastic member 26 for adjusting the angle of the head 15c.

Conventionally, when the arrangement of heads is three or more rows, it is common to arrange the heads diagonally even if the plurality of heads have the same color in consideration of the layout of the head position adjusting mechanism. However, if the layouts of a plurality of heads having the same color in the main scanning direction are aligned as much as possible, the difference in ejection time of the heads is small, which leads to improvement in image quality. As shown in FIG. 3, in the present embodiment, the three heads 15a, 15b, and 15c can be arranged in a “dogleg” shape by the intermediate bracket 25, and the degree of freedom in arranging the heads can be improved. it can.

The liquid discharge unit according to one embodiment of the present invention includes the head position adjusting mechanism described in the first and second embodiments and a plurality of liquid discharge heads provided in the head position adjusting mechanism. To configure.

Subsequently, an advantageous configuration of the present invention will be described.

FIG. 4 is a schematic cross-sectional view taken along the line AA of FIGS. 2A and 3A. In FIG. 4, the same objects as those in FIG. 2A are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, it is desirable that the adjusting screw 27 is provided with a flange, and is screwed into the screw hole portion 20 via an elastic member 28 such as a spring. Since the adjusting screw 27 is urged by the elastic member 28 in a direction away from the first bracket 11 (or the intermediate brackets 24 and 25), the backlash between the adjusting screw 27 and those brackets can be removed, and after the head position is adjusted. It is possible to prevent misalignment. It is desirable that this configuration be applied to all adjusting screws of the head position adjusting mechanism.

Further, it is desirable that the maximum extrusion amount of the first and second movable members 13 and 18 is smaller than the radius r of the spherical first and second movable members 13 and 18, respectively. This makes it possible to prevent the first and second movable members 13 and 18 from being completely pushed out of the storage portion 19.

Subsequently, the liquid discharge device according to the embodiment of the present invention will be described. FIG. 5 is a plan view showing a main part of the liquid discharge device according to the embodiment of the present invention. FIG. 6 is a side view showing a main part of the liquid discharge device according to the embodiment of the present invention.

This device is a serial type device, and the carriage 403 is reciprocated in the main scanning direction by the main scanning moving mechanism 493. The main scanning movement mechanism 493 includes a guide member 401, a main scanning motor 405, a timing belt 408, and the like. The guide member 401 is bridged over the left and right side plates 491A and 491B to movably hold the carriage 403. Then, the carriage 403 is reciprocated in the main scanning direction by the main scanning motor 405 via the timing belt 408 bridged between the drive pulley 406 and the driven pulley 407.

The carriage 403 is equipped with a liquid discharge unit 440 in which a liquid discharge head 404 provided in the head position adjusting mechanism according to the embodiment of the present invention and a head tank 441 are integrated. The liquid discharge head 404 of the liquid discharge unit 440 discharges liquids of, for example, yellow (Y), cyan (C), magenta (M), and black (K). Further, the liquid discharge head 404 is mounted by arranging a nozzle array composed of a plurality of nozzles in the sub-scanning direction orthogonal to the main scanning direction and directing the discharge direction downward.

The liquid stored in the liquid cartridge 450 is supplied to the head tank 441 by the supply mechanism 494 for supplying the liquid stored outside the liquid discharge head 404 to the liquid discharge head 404.

The supply mechanism 494 includes a cartridge holder 451 which is a filling portion for mounting the liquid cartridge 450, a tube 456, a liquid feeding unit 452 including a liquid feeding pump, and the like. The liquid cartridge 450 is detachably attached to the cartridge holder 451. Liquid is fed from the liquid cartridge 450 to the head tank 441 by the liquid feeding unit 452 via the tube 456.

This device includes a transport mechanism 495 for transporting the paper 410. The transport mechanism 495 includes a transport belt 412, which is a transport means, and a sub-scanning motor 416 for driving the transport belt 412.

The transport belt 412 attracts the paper 410 and transports it at a position facing the liquid discharge head 404. The transport belt 412 is an endless belt, and is hung between the transport roller 413 and the tension roller 414. Adsorption can be performed by electrostatic adsorption, air suction, or the like.

Then, the transport belt 412 orbits in the sub-scanning direction by rotationally driving the transport roller 413 via the timing belt 417 and the timing pulley 418 by the sub-scanning motor 416.

Further, on one side of the carriage 403 in the main scanning direction, a maintenance / recovery mechanism 420 for maintaining / recovering the liquid discharge head 404 is arranged on the side of the transport belt 412.

The maintenance / recovery mechanism 420 is composed of, for example, a cap member 421 that caps the nozzle surface (the surface on which the nozzle is formed) of the liquid discharge head 404, a wiper member 422 that wipes the nozzle surface, and the like.

The main scanning movement mechanism 493, the supply mechanism 494, the maintenance / recovery mechanism 420, and the transport mechanism 495 are attached to a housing including the side plates 491A and 491B and the back plate 491C.

In this device configured in this way, the paper 410 is fed onto the transport belt 412 and sucked, and the paper 410 is transported in the sub-scanning direction by the orbital movement of the transport belt 412.

Therefore, by driving the liquid discharge head 404 in response to the image signal while moving the carriage 403 in the main scanning direction, the liquid is discharged to the stopped paper 410 to form an image.

As described above, since this device includes the liquid discharge unit 440 according to the embodiment of the present invention, it is possible to stably form a high-quality image.

Next, another example of the liquid discharge unit according to the embodiment of the present invention will be described. FIG. 7 is a plan view showing a main part of the liquid discharge unit according to another embodiment.

This liquid discharge unit includes a housing portion composed of side plates 491A, 491B and a back plate 491C, a main scanning movement mechanism 493, a carriage 403, and a liquid among the members constituting the device for discharging the liquid. It is composed of a discharge head 404.

A liquid discharge unit in which at least one of the above-mentioned maintenance / recovery mechanism 420 and the supply mechanism 494 is further attached to, for example, the side plate 491B of the liquid discharge unit can be configured.

Next, still another example of the liquid discharge unit according to the embodiment of the present invention will be described. FIG. 8 is a plan view showing a main part of the liquid discharge unit according to still another embodiment.

This liquid discharge unit is composed of a liquid discharge head 404 to which the flow path component 444 is attached and a tube 456 connected to the flow path component 444.

The flow path component 444 is arranged inside the cover 442. A head tank 441 may be included instead of the flow path component 444. Further, a connector 443 that electrically connects to the liquid discharge head 404 is provided above the flow path component 444.

Subsequently, a clear definition is given for the terms used in the present application.

The "liquid discharge device" is a device including a liquid discharge head or a liquid discharge unit, which drives the liquid discharge head to discharge the liquid. The device for discharging the liquid includes not only a device capable of discharging the liquid to a device to which the liquid can adhere, but also a device for discharging the liquid into the air or the liquid.

This "liquid discharge device" can also include means related to feeding, transporting, and discharging paper to which a liquid can adhere, as well as a pretreatment device, a posttreatment device, and the like.

The "liquid ejection device" includes, for example, an image forming apparatus which is an apparatus for ejecting ink to form an image on paper, and a layered powder for forming a three-dimensional model (three-dimensional model). There is a three-dimensional modeling device (three-dimensional modeling device) that discharges the modeling liquid into the powder layer.

Further, the "liquid discharge device" is not limited to a device in which significant images such as characters and figures are visualized by the discharged liquid. For example, those that form patterns that have no meaning in themselves and those that form a three-dimensional image are also included.

The above-mentioned "material to which a liquid can adhere" means a material to which a liquid can adhere at least temporarily, such as one that adheres and adheres, and one that adheres and permeates. Specific examples include media such as paper, recording paper, recording paper, film, cloth and other recording media, electronic substrates, electronic components such as piezoelectric elements, powder layers (powder layers), organ models, and inspection cells. Yes, including anything to which the liquid adheres, unless otherwise specified.

The materials of the above "materials to which liquid can adhere" are paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, building materials such as wallpaper and flooring, and textiles for clothing. However, it is sufficient if it can be attached.

The "liquid" also includes inks, treatment liquids, DNA samples, resists, pattern materials, binders, modeling liquids, or solutions and dispersions containing amino acids, proteins, and calcium.

Further, the "liquid discharge device" includes, but is not limited to, a device in which the liquid discharge head and the device to which the liquid can adhere move relatively. Specific examples include a serial type device that moves the liquid discharge head, a line type device that does not move the liquid discharge head, and the like.

In addition, as the "liquid ejection device", there is a processing liquid coating device that ejects the processing liquid onto the paper in order to apply the processing liquid to the surface of the paper for the purpose of modifying the surface of the paper. In addition, there is also an injection granulator that injects a composition liquid in which a raw material is dispersed in a solution through a nozzle to granulate fine particles of the raw material.

The "liquid discharge unit" is a liquid discharge head integrated with functional parts and a mechanism, and is an assembly of parts related to liquid discharge. For example, the "liquid discharge unit" includes a combination of at least one of a head tank, a carriage, a supply mechanism, a maintenance / recovery mechanism, and a main scanning movement mechanism with a liquid discharge head.

Here, "integration" means, for example, a liquid discharge head and a functional component, a mechanism fixed to each other by fastening, adhesion, engagement, etc., or one in which one is movably held with respect to the other. Including. Further, the liquid discharge head, the functional parts, and the mechanism may be detachably attached to each other.

For example, as a liquid discharge unit, there is a liquid discharge head and a head tank integrated like the liquid discharge unit 440 shown in FIG. In addition, there are cases in which the liquid discharge head and the head tank are integrated by being connected to each other by a tube or the like. Here, a unit including a filter can be added between the head tank of these liquid discharge units and the liquid discharge head.

Further, as a liquid discharge unit, there is a liquid discharge head and a carriage integrated.

Further, there is a liquid discharge unit in which the liquid discharge head and the scanning movement mechanism are integrated by holding the liquid discharge head movably by a guide member forming a part of the scanning movement mechanism. Further, as shown in FIG. 7, there is a liquid discharge unit in which a liquid discharge head, a carriage, and a main scanning movement mechanism are integrated.

Further, as a liquid discharge unit, there is a carriage to which a liquid discharge head is attached, in which a cap member which is a part of the maintenance / recovery mechanism is fixed, and the liquid discharge head, the carriage, and the maintenance / recovery mechanism are integrated. ..

Further, as a liquid discharge unit, as shown in FIG. 8, a tube is connected to a head tank or a liquid discharge head to which a flow path component is attached, and the liquid discharge head and a supply mechanism are integrated. ..

The main scanning movement mechanism shall also include a single guide member. Further, the supply mechanism includes a tube unit and a loading unit unit.

Further, the pressure generating means used for the "liquid discharge head" is not limited. For example, in addition to the piezoelectric actuator (which may use a laminated piezoelectric element) as described in the above embodiment, it is composed of a thermal actuator using an electric heat conversion element such as a heat generating resistor, a vibrating plate, and a counter electrode. An electrostatic actuator or the like may be used.

In addition, image formation, recording, printing, printing, printing, modeling, etc. in the terms of the present application are all synonymous.

The present invention has been described in detail above using the embodiments. This embodiment is an example, and can be modified and used in various ways without departing from the gist.

1a, 1b, 1c Head position adjustment mechanism 10 Head plate 11 1st bracket 12 2nd bracket 13 1st movable member 18 2nd movable member 14 1st elastic member 17 2nd elastic member 26 3rd elastic member 28 Elastic member 15, 15a, 15b, 15c Head 16 Rotational support 19 Storage 20 Thread hole 21, 22, 27 Adjusting screw 24, 25 Intermediate bracket 401 Guide member 403 Carriage 404 Liquid discharge head 405 Main scanning motor 406, 407 Driven pulley 408 Timing belt 410 Paper 412 Conveyance belt 413 Conveyance roller 414 Tension roller 416 Sub-scanning motor 417 Timing belt 418 Timing pulley 420 Maintenance recovery mechanism 421 Cap member 422 Wiper member 440 Liquid discharge unit 441 Head tank 442 Cover 443 Connector 444 Flow path part 450 Liquid cartridge 451 Cartridge holder 452 Liquid transfer unit 456 Tube 491A Side plate 491B Side plate 491C Back plate 493 Main scanning movement mechanism 494 Supply mechanism 495 Conveyance mechanism

Japanese Unexamined Patent Publication No. 2005-219236

Claims (10)

A head position adjustment mechanism that adjusts the positions of a plurality of liquid discharge heads arranged on a head plate.
The first and second brackets arranged on the head plate and holding the liquid discharge head in pairs,
A first movable member provided on the first bracket and capable of moving the liquid discharge head in one direction,
A first elastic member provided on the second bracket and urging the liquid discharge head toward the first movable member.
A rotation support portion that serves as a rotation fulcrum around the normal of the liquid discharge surface of the liquid discharge head,
A second movable member provided on the first bracket and rotating the liquid discharge head around the rotation support portion.
A second elastic member that biases the liquid discharge head toward the second movable member,
In the head position adjustment mechanism provided with
Between the adjacent liquid discharge heads, the first and second brackets are the first and second movable members used for one of the liquid discharge heads and the first used for the other liquid discharge head. A head position adjusting mechanism characterized in that it is configured as an intermediate bracket provided with an elastic member. The first movable member and the first elastic member are arranged on one side surface of the liquid discharge head, respectively.
The head position adjusting mechanism according to claim 1, wherein the rotation support portion and the second movable member are arranged on the other side surface of the liquid discharge head. The intermediate bracket of the head position adjusting mechanism includes a third elastic member.
The head position adjusting mechanism according to claim 1 or 2, wherein the third elastic member is used as the second elastic member for a further liquid discharge head. The first bracket and the intermediate bracket
Two storage units for storing the first and second movable members, respectively,
It has two screw holes leading to each of the storage portions.
Adjustable screws that can be screwed in are provided in each of the screw holes.
Claims 1 to 1, wherein the tip of the adjusting screw pushes the corresponding first or second movable member out of the accommodating portion in which the adjusting screw is screwed into the screw hole. The head position adjusting mechanism according to any one of 3. The head position adjusting mechanism according to claim 4, wherein the tip of the adjusting screw has a conical shape, and the first and second movable members have a spherical shape. The fifth aspect of claim 5, wherein the maximum extrusion amount of the first and second movable members by screwing the adjusting screw into the screw hole is smaller than the radius of the first and second movable members, respectively. Head position adjustment mechanism. The head position adjusting mechanism according to any one of claims 4 to 6, wherein the adjusting screw is screwed into the first bracket or the intermediate bracket via an elastic member. A liquid discharge unit comprising the head position adjusting mechanism according to any one of claims 1 to 7 and a plurality of liquid discharge heads provided in the head position adjusting mechanism. A head tank for storing the liquid to be supplied to the liquid discharge head, a carriage on which the liquid discharge head is mounted, a supply mechanism for supplying the liquid to the liquid discharge head, a maintenance / recovery mechanism for maintaining and recovering the liquid discharge head, and the above. The liquid discharge unit according to claim 8, wherein the liquid discharge unit is integrated with at least one of the main scanning movement mechanisms for moving the liquid discharge head in the main scanning direction. A liquid discharge device including the liquid discharge unit according to claim 8 or 9.

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