HEAD UNIT ASSEMBLY AND DEVICE FOR EJECTING LIQUID

Abstract

To improve operability of a fixing member for fixing a plurality of head units to a base member.SOLUTION: A head unit assembly includes: a plurality of head units which are arranged in a zigzag form in a predetermined arrangement direction on a base member and have heads for discharging liquid; a first arm which is rotated around a first rotation fulcrum and fixes each one end side OUT of the plurality of head units at first fixed positions P1; and a second arm which is rotated around a second rotation fulcrum and fixes each other end side IN of the plurality of head units at second fixed positions P2. The second fixed position is positioned at the IN near the center in a direction perpendicular a predetermined arrangement direction Y, in a region S where the plurality of head units are arranged in a zigzag form, compared to the first fixed positions, and a distance D2 between the second rotation fulcrum of the second arm and the second fixed position is longer than a distance D1 between the first rotation fulcrum and the first fixed position.SELECTED DRAWING: Figure 4A

Description

[Technical field]

[0001] The present invention relates to a head unit assembly having a plurality of head units and an apparatus for ejecting liquid. [Background technology]

[0002] An inkjet printer has a plurality of inkjet heads, and performs desired printing or image recording by ejecting minute ink droplets from the nozzles of each inkjet head onto a recording medium.

[0003] The inkjet printer described in Patent Document 1 has four head units 40K-1 to 40K-4 arranged in a staggered pattern in a direction perpendicular to the transport direction of the recording medium (see FIG. 4), thereby forming an image across the entire width of the recording medium. Summary of the Invention [Problem to be solved by the invention]

[0004] When the head units are arranged in a staggered pattern, it is difficult to operate the head unit fixing members that are located toward the center in the direction perpendicular to the arrangement direction of the head units.

[0005] An object of the present invention is to improve the operability of a fixing member that fixes a plurality of head units to a base member. [Means for solving the problem]

[0006] In order to solve the above problem, the head unit assembly of the present invention comprises a base member, a plurality of head units arranged in a staggered pattern along a predetermined arrangement direction on the base member and having heads that eject liquid, a first arm that rotates about a first pivot point and fixes one end side of each of the plurality of head units at a first fixed position, and a second arm that rotates about a second pivot point and fixes the other end side of each of the plurality of head units at a second fixed position, wherein the second fixed position is located closer to the center in a direction perpendicular to the predetermined arrangement direction in an area in which the plurality of head units are arranged in a staggered pattern compared to the first fixed position, and the distance from the second pivot point of the second arm to the second fixed position is longer than the distance from the first pivot point of the first arm to the first fixed position. Effect of the Invention

[0007] According to the present invention, it is possible to improve the operability of the fixing member that fixes a plurality of head units to the base member. [Brief description of the drawings]

[0008] [Figure 1] 1A is a perspective view showing a main part of a line-printer type inkjet printer according to an embodiment of the present invention, and FIG. 1B is a perspective view showing the main part when printing. [Diagram 2] FIG. 2A is a side view and FIG. 2B is a front view showing a main part of the inkjet printer. [Diagram 3] 2A is an external perspective view of a head unit assembly, and FIG. 2B is an internal perspective view without a cover. [Figure 4A] 1A is a plan view of the head unit assembly without the cover, and FIG. 1B is a plan view of the head. [Figure 4B] 3A and 3B are a perspective view and a side view, respectively, of the head of the head unit assembly. [Figure 4C] 2 is an overall cross-sectional view of a head of the head unit assembly. FIG. [Figure 5A]4A(a) is a plan view of the V portion surrounded by the dashed line in FIG. 4A in a locked state, and FIG. 4B is a plan view of the V portion surrounded by the dashed line in FIG. 4A in a unlocked state with the right head. [Figure 5B] 1A is a perspective view of the head of the head unit assembly, in which (a) is a perspective view in a locked state, (b) is a perspective view in a state in which the rear head is unlocked, and (c) is a perspective view in a state in which the rear head is being removed. FIG. [Figure 5C] FIG. 13 is a perspective view of the state in which the right head is being removed. [Figure 6A] FIG. 2 is a perspective view of a first toggle clamp. [Figure 6B] FIG. 13 is a perspective view of a second toggle clamp. [Figure 7A] 13 is a perspective view of a head unit assembly of a comparative example in which each head is fixed with a bolt. FIG. [Figure 7B] 13 is a plan view of a head unit assembly of a comparative example in which each head is fixed by a toggle clamp. [Figure 7C] FIG. 7C is a plan view of the head unit assembly in FIG. 7B in which the head spacing is expanded. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (● Head unit assembly) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a main part (head unit assembly 101) of a line printer type inkjet printer (a device that ejects liquid) according to an embodiment of the present invention, where (a) is a perspective view when not printing, and (b) is a perspective view when printing.

[0010] Head unit assembly 101 is disposed straddling the downstream end of carry-in conveyor 102 and the upstream end of carry-out conveyor 103. Head unit assembly 101 can be raised and lowered in the vertical direction (the direction of the arrow in FIG. 1(a)) by lifting unit 104.

[0011] The recording medium M is transported in the direction of the arrows in Fig. 1(b) on the carry-in conveyor 102 and the carry-out conveyor 103. When the recording medium M passes under the head unit assembly 101 as shown in Fig. 1(b) and Fig. 2(a) and (b), pressurized ink is ejected from the nozzles of multiple inkjet heads mounted on the head unit assembly 101.

[0012] As shown in Fig. 3, the head unit assembly 101 has a plurality of head units 200 arranged on a rectangular plate-shaped base member 210. The head units 200 are arranged in a staggered pattern in two parallel rows as shown in Fig. 4A(a).

[0013] In this embodiment, five head units 200 are arranged in the left column and four in the right column at equal intervals in the Y direction. This number of head units 200 is merely an example and does not limit the scope of the present invention.

[0014] Each head unit 200 has multiple droplet ejection heads 300 as shown in Fig. 4A(b). The droplet ejection heads 300 are arranged in a line in the Y direction to enable uninterrupted printing. For compactness, it is desirable to arrange the droplet ejection heads 300 in a single line in the Y direction, but since there is a limit to the length of the head units 200 in the Y direction, a continuous image is printed by arranging the head units 200 in a staggered pattern.

[0015] (● Droplet ejection head) The droplet ejection head 300 can be of various types, such as a valve type, a thermal (bubble) type, a piezoelectric type, a discharge type, an electrostatic displacement type, a thermal displacement type, etc. Here, a valve type droplet ejection head 300 will be described with reference to Figures 4B and 4C.

[0016] 4B, the droplet ejection head 300 includes a lower housing 310a and an upper housing 310b bonded (laminated) to the lower housing 310a. The lower housing 310a is made of a material with high thermal conductivity such as metal, and the upper housing 310b is made of a material with low thermal conductivity such as resin.

[0017] The lower housing 310a is provided with heaters 340 on its front and rear surfaces. The heaters 340 are temperature controllable and heat the lower housing 310a. The upper housing 310b is provided with a connector 350 for communicating electrical signals on its upper portion.

[0018] 4C is an overall cross-sectional view (cross-sectional view taken along line AA in FIG. 4B(a)) of the droplet ejection head 300. The lower housing 310a holds a nozzle plate 301 equipped with nozzles 302 for ejecting droplets. The lower housing 310a also includes a flow path 312 (liquid supply section) that sends liquid from the supply port 311 side through the nozzle plate 301 to the recovery port 313 side.

[0019] The upper housing 310b includes a supply port 311 and a recovery port 313 that connect to the flow path 312 of the lower housing 310a. Between the supply port 311 and the recovery port 313, a droplet ejection module 330 is disposed for ejecting the liquid in the flow path 312 from the nozzle 302 as droplets.

[0020] The droplet ejection modules 330 correspond to the number of nozzles 302 provided in the housing 310a, and in this example, a configuration is shown that includes eight droplet ejection modules 330 corresponding to the eight nozzles 302 arranged in a row. Note that the number and arrangement of the nozzles 302 and droplet ejection modules 330 are not limited to those described above.

[0021] For example, the number of nozzles 302 and droplet ejection modules 330 may be one instead of multiple. Furthermore, the nozzles 302 and droplet ejection modules 330 may be arranged in multiple rows instead of one line.

[0022] 4C, reference numeral 315 denotes a seal member provided at the joint between housing 310a and housing 310b. In this example, an O-ring is used as the seal member to prevent liquid from leaking from the joint between housing 310a and housing 310b.

[0023] With the above configuration, the supply port 311 takes in pressurized liquid (ink, paint, etc.) from the outside, sends the liquid in the direction of arrow a1, and supplies the liquid to the flow path 312. The flow path 312 sends the liquid from the supply port 311 in the direction of arrow a2. Then, the recovery port 313 recovers the liquid not ejected from the nozzles 302 arranged along the flow path 312 in the direction of arrow a3.

[0024] The droplet ejection module 330 includes a needle valve 331 that opens and closes the nozzle 302, and a piezoelectric element 332 (valve type) that serves as a driver for driving the needle valve 331. The piezoelectric element 332 expands and contracts in the longitudinal direction when a voltage is applied.

[0025] The housing 310b is provided with a restricting member 314 at a position facing the upper end of the piezoelectric element 332. The restricting member 314 abuts against the upper end of the piezoelectric element 332 and forms a fixing point for the piezoelectric element 332.

[0026] Here, the nozzle plate 301 is an example of a plate member, the nozzle 302 is an example of a droplet ejection port, the needle valve 331 is an example of a valve body, and the piezoelectric element 332 is an example of a driver.

[0027] In the above configuration, when the piezoelectric element 332 is operated to move the needle valve 331 upward, the nozzle 302 that was closed by the needle valve 331 opens, and droplets can be ejected from the nozzle 302. When the piezoelectric element 332 is operated to move the needle valve 331 downward, the tip of the needle valve 331 comes into contact with the nozzle 302, closing the nozzle 302 and preventing droplets from being ejected from the nozzle 302.

[0028] (● Toggle clamp) 5A to 5C are enlarged views of the V portion surrounded by a dashed line in Fig. 4A(a), and show a method for fixing the head unit 200. Each head unit 200 is fixed by left and right toggle clamps 400, 410 as fixing members spaced apart in the X direction (the conveying direction of the recording medium) in Fig. 5A.

[0029] 4A and 5A, the head units 200 at both ends in the Y direction perpendicular to the X direction are fixed on both the left and right sides by first toggle clamps 400 as first fixing members. The other head units 200 are fixed by the first toggle clamps 400 as first fixing members and the second toggle clamps 410 as second fixing members.

[0030] 6A and 6B, the toggle clamps 400, 410 have operation levers 402, 412 that are rotatable about first rotation fulcrums 401, 411, and pressing arms 404, 414 that are rotatable about second rotation fulcrums 403, 413. Pressing portions 405, 415 are provided at the tips of the pressing arms 404, 414. In this embodiment of the present invention, the pressing arm 414 of the second toggle clamp 410 is approximately twice as long as the pressing arm 404 of the first toggle clamp 400.

[0031] The operating levers 402, 412 and the pressing arms 404, 414 are connected to each other at their intermediate portions by link plates 406, 416. By rotating the operating levers 402, 412 in the direction of the arrow, the pressing arms 404, 414 are rotated in the vertical direction. By pressing the pressing portions 201 protruding on both the left and right sides of each head unit 200 with the pressing portions 405, 415 at the tips of the pressing arms 404, 414, each head unit 200 is positioned and fixed at a predetermined position on the base member 210.

[0032] As shown in Figures 4A and 5A, the toggle clamps 400, 410 are disposed on the outside of the two parallel rows of head units 200. More specifically, the positions of the first rotation fulcrums 401, 411 of the toggle clamps 400, 410 are disposed on the outside of the straight lines L1, L2 in Figure 5A which pass through the outermost sides of the two parallel rows of head units 200. It is desirable that the mutual distance W between the straight lines L1, L2 be as narrow as possible in order to make the head unit assembly 101 compact and not change the color on the recording medium M.

[0033] Therefore, except for the head units 200 at both ends in the Y direction, the pressed parts 201 located on the inside in the X direction of each head unit 200 are difficult to operate with the first toggle clamp 400 because the operation lever 402 is pinched in the Y direction by the head units 200. Therefore, in the embodiment of the present invention, except for the head units 200 at both ends in the Y direction, the pressed parts 201 located on the inside in the X direction of each head unit 200 are fixed / released by the second toggle clamp 410.

[0034] The pressing arm 404 of the first toggle clamp 400 is disposed rotatably in the X direction outside the two parallel rows of head units 200, i.e., in the X direction outside the straight lines L1 and L2 in Fig. 5A(a). In contrast, the pressing arm 414 of the second toggle clamp 410 is disposed rotatably in the X direction between the head units 200 adjacent in the two parallel rows (Y direction).

[0035] The pressing arm 414 of the second toggle clamp 410 is approximately twice as long as the pressing arm 404 of the first toggle clamp 400. The length of this pressing arm 414 is long enough to position the operating lever 412 of the second toggle clamp 410 on the outer side of the straight lines L1 and L2 in the X direction. Therefore, the head unit 200 does not get in the way when operating the operating lever 412, improving the operability of the operating lever 412.

[0036] (● Removing and replacing the head unit) When attaching, detaching, or replacing the head unit 200, for example, the head unit 200 on the right side, rear side in Figures 5A(b) and 5B(b), the operating lever 402 of the first toggle clamp 400 and the operating lever 412 of the second toggle clamp 410 are tilted outward. This releases the head unit 200 from the base member 210, and the head unit 200 can be removed as shown in Figures 5B(c) and 5C.

[0037] When attaching a new head unit 200, place the new head unit 200 in the original position of the removed head unit 200, and rotate the operating lever 402 of the first toggle clamp 400 and the operating lever 412 of the second toggle clamp 410 upward to stand it upright. This causes the pressed parts 201 on both sides of the head unit 200 to be pressed downward by the pressing parts 405, 415 at the tips of the pressing arms 404, 414, and the head unit 200 is fixed to the base member 210.

[0038] As shown in FIG. 4A(a), the head unit assembly of this embodiment comprises a base member 210 and a plurality of head units 200 arranged in a staggered pattern on the base member 210 along a predetermined arrangement direction, the head units having heads for ejecting liquid.

[0039] 6A and 6B are provided to fix the head unit 200 to the base member 210. That is, a first toggle clamp 400 as a first fixing member and a second toggle clamp 410 as a second fixing member.

[0040] The first toggle clamp 400 has a first arm (pressing arm 404) that rotates around a first rotation fulcrum (second rotation fulcrum 403) and fixes one end side OUT of each of the multiple head units 200 at a first fixing position (P1, pressing portion 405).

[0041] The second toggle clamp 410 has a second arm (pressing arm 414) that rotates around a second pivot point (second pivot point 413) and fixes the other end side IN of each of the multiple head units 200 at a second fixing position (P2, pressing portion 415).

[0042] Compared to the first fixed position (P1, pressing portion 405), the second fixed position (P2, pressing portion 415) is located closer to the center IN in a direction perpendicular to a predetermined arrangement direction Y in the area S where multiple head units 200 are arranged in a staggered pattern.

[0043] Furthermore, a distance D2 from the second pivot point (second pivot point 413) of the second arm (pressing arm 414) to the second fixed position (P2, pressing portion 415) is longer than a distance D1 from the first pivot point (second pivot point 403) of the first arm (pressing arm 404) to the first fixed position (P1, pressing portion 405).

[0044] According to the head unit assembly of this embodiment, a second arm (pressing arm 414) longer than the first arm (pressing arm 404) is used as an arm to fix the other end side IN of each head unit 200 at the second fixing position (P2, pressing portion 415).

[0045] Therefore, the head unit 200 can be easily fixed at the second fixing position P2, which is difficult to perform the fixing operation, since it is sandwiched between the head units 200 on both sides in the Y direction (predetermined arrangement direction) and is located at a position IN toward the center in the X direction perpendicular to the predetermined arrangement direction Y.

[0046] On the other hand, at the first fixing position P1, which is not sandwiched between head units 200 on both sides and is located on the outer side OUT in the X direction perpendicular to the predetermined arrangement direction Y, the head unit 200 is fixed using a first arm (pressing arm 404) which is shorter than the second arm (pressing arm 414). Therefore, the area required for arranging the arm and its rotation trajectory can be reduced, and the device can be made more compact than when the second arm (pressing arm 414) is used at all points of the head unit assembly.

[0047] Moreover, the head unit assembly according to this embodiment includes a first operating lever (operating lever 402) that rotates the first arm (pressing arm 404) and a second operating lever (operating lever 412) that rotates the second arm (pressing arm 414), and the first operating lever (operating lever 402) and the second operating lever (operating lever 412) are arranged outside the area S in which the multiple head units 200 are arranged in a staggered manner in the X direction perpendicular to the predetermined arrangement direction Y. This makes it possible to easily arrange and fix the multiple head units 200 in a staggered manner.

[0048] In addition, it is more preferable to use the first arm (pressing arm 404) rather than the second arm (pressing arm 414) as the arm for fixing the other end side IN of each of the two head units 200 arranged at both ends in the predetermined arrangement direction Y at the first fixing position P1. Since only one side of the first fixing positions arranged at both ends is sandwiched by the head units 200, fixing of the head units 200 is relatively easy. Therefore, the head unit 200 is fixed using the first arm (pressing arm 404) which is shorter than the second arm (pressing arm 414). Therefore, the area required for arranging the arm and its rotation trajectory can be reduced, and the device can be made more compact than when the other end side IN of the two head units 200 arranged at both ends is fixed using the second arm (pressing arm 414). This makes it possible to easily perform the assembly operation of the head units 200 while making the device compact.

[0049] (Comparative Example) 7A and 7B, the line printer according to the comparative example has head units 200, each having a plurality of inkjet heads, arranged in a staggered pattern on a base member 210. To fix each head unit 200 to the base member 210, a bolt B is used as a fixing member in Fig. 7A, and a toggle clamp 400 is used in Fig. 7B.

[0050] When the head unit 200 reaches the end of its life or breaks down, the entire head unit 200 is replaced, but the fixing method using bolt B as shown in Fig. 7A makes it difficult to attach and detach the head unit 200. The fixing method using toggle clamp 400 does not require tools and makes it easy to attach and detach the head unit 200.

[0051] As shown in FIG. 6A , the toggle clamp 400 has an operating lever 402 that is rotatable around a first pivot point 401, a pressing arm 404 that is rotatable around a second pivot point 403, a pressing portion 405 at the tip of the pressing arm 404, and a link plate 406 that interconnects the operating lever 402 and the middle portion of the pressing arm 404.

[0052] As shown in FIG. 7B, the head units 200 are arranged close to each other in the conveying direction of the recording medium, so that when the operation lever 402 of the toggle clamp 400 on the inside is operated, the adjacent head units 200 get in the way, making it difficult to operate. If the interval between the head units 200 is widened in the conveying direction of the recording medium as shown in FIG. 7C, the operation lever 402 of the toggle clamp 400 on the inside becomes easier to operate, but the base member 210 becomes larger and the color on the recording medium is adversely affected. For this reason, the compactness and color of the machine are prioritized at the expense of workability. According to the embodiment of the present invention, it is possible to improve the operability of the fixing member while making the device more compact than in the comparative example.

[0053] (●Conclusion) Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible based on the technical ideas described in the claims. For example, the toggle clamps 400 and 410 that fix the head unit 200 are one example of a fixing member, and other fixing members can be used as long as they have substantially the same function as the toggle clamps 400 and 410.

[0054] The liquid discharged from the device is not particularly limited as long as it has a viscosity and surface tension that allows it to be discharged from the head. More specifically, it is a solution, suspension, emulsion, etc. containing a solvent such as water or an organic solvent, a colorant such as a dye or a pigment, a functionalizing material such as a polymerizable compound, a resin, a surfactant, etc., a biocompatible material such as DNA, an amino acid, a protein, calcium, etc., an edible material such as a natural dye, etc., and these can be used for applications such as inkjet ink, surface treatment liquid, a liquid for forming a component of an electronic element or a light-emitting element, an electronic circuit resist pattern, a material liquid for three-dimensional modeling, etc. The liquid may also be a paint.

[0055] The term "liquid ejection device" includes devices that have a liquid ejection head or a liquid ejection unit and eject liquid by driving the liquid ejection head. Liquid ejection devices include not only devices that can eject liquid onto objects to which the liquid can adhere, but also devices that eject liquid into air or liquid.

[0056] This "liquid ejecting device" can also include means for feeding, transporting, and discharging items onto which liquid can be attached, as well as pre-processing devices and post-processing devices.

[0057] For example, examples of "devices that eject liquid" include image forming devices that eject ink to form an image on paper, and three-dimensional modeling devices that eject modeling liquid onto a powder layer formed by layering powder in order to create a three-dimensional object (a three-dimensional model).

[0058] In addition, the term "liquid ejection device" is not limited to devices that use ejected liquid to visualize meaningful images such as letters and figures. For example, it also includes devices that form patterns that have no meaning in themselves and devices that create three-dimensional images.

[0059] The above-mentioned "material to which a liquid can adhere" means material to which a liquid can adhere at least temporarily, and material to which the liquid adheres and sticks, material to which the liquid adheres and penetrates, etc. Specific examples include media such as paper, recording paper, film, cloth, and other recording media, electronic substrates, electronic components such as piezoelectric elements, powder layers, organ models, test cells, automobile and aircraft bodies, building materials, wallpaper, and battery materials, and unless otherwise specified, all materials to which a liquid can adhere are included.

[0060] The material of the above-mentioned "object to which liquid can adhere" may be any material to which liquid can adhere even temporarily, such as paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, and ceramics.

[0061] Although the above embodiment has been described taking a line printer as an example, the present invention is not limited to this. For example, the present invention may be applied to a so-called serial printer in which a carriage is mounted with multiple head units arranged in a staggered pattern, and liquid is ejected while the carriage is scanned onto an object onto which the liquid can be attached.

[0062] (● Other aspects of the present invention) Moreover, the embodiment of the present invention includes at least the following aspects 1-4. (Aspect 1) A head unit assembly in which a plurality of head units are arranged in a staggered pattern in two parallel rows on a base member, A head unit assembly characterized in that a fixing member for removably fixing each of the multiple head units to the base member has a first fixing member and a second fixing member spaced apart in a direction perpendicular to the direction of the arrangement of the head units in two parallel rows, and the first fixing member and the second fixing member are each positioned outside the two parallel rows of head units in the perpendicular direction.

[0063] (Aspect 2) A head unit assembly of aspect 1, characterized in that the first fixing member is composed of a first toggle clamp, the second fixing member is composed of a second toggle clamp, and the pivot points of the operating levers of the first and second toggle clamps are positioned outside the two parallel rows of head units in the perpendicular direction.

[0064] (Aspect 3) The head unit assembly of aspect 2, characterized in that the first and second toggle clamps have pressure arms that rotate with the operating lever to press the head unit toward the base member, the pressure arm of the first toggle clamp being arranged rotatably in the perpendicular direction outside the two parallel rows of head units, and the pressure arm of the second toggle clamp being arranged rotatably in the perpendicular direction between adjacent head units in the two parallel rows.

[0065] (Aspect 4) 4. The head unit assembly of any one of aspects 1 to 3, wherein each of the plurality of head units has an inkjet head. [Explanation of symbols]

[0066] 101: Head unit assembly 102: Intake conveyor 103: Discharge conveyor 104: Lifting unit 200: Head unit 201: Pressed part 210: Base member 300: Droplet ejection head 301: Nozzle plate 302: Nozzle 310a: Lower housing 310b: Upper housing 311: Supply port 312: Flow path 313: Collection port 314: Regulating member 315: Sealing member 330: Droplet ejection module 331: Needle valve 332: Piezoelectric element 340: Heater 350: Connector 400, 410: Toggle clamp 402, 412: Operating lever 404, 414: Pressing arm 405, 415: Pressing part 406, 416: Link plate B: Bolt L1, L2: Straight line M: Recording medium S: Staggered areas W: Interval [Prior art documents] [Patent documents]

[0067] [Patent Document 1] JP 2017-144718 A

Claims

1. A base member; a plurality of head units arranged in a staggered manner along a predetermined arrangement direction on the base member, the head units having heads for ejecting liquid; a first arm that rotates about a first rotation fulcrum and fixes one end side of each of the plurality of head units at a first fixing position; a second arm that rotates about a second rotation fulcrum and fixes the other end side of each of the plurality of head units at a second fixing position; the second fixing position is located closer to the center in a direction perpendicular to the predetermined arrangement direction in a region in which the plurality of head units are arranged in a staggered manner than the first fixing position; A head unit assembly, characterized in that the distance from the second pivot point of the second arm to the second fixed position is longer than the distance from the first pivot point of the first arm to the first fixed position.

2. A first operating lever that rotates the first arm; a second operating lever for rotating the second arm, The head unit assembly according to claim 1, characterized in that the first operating lever and the second operating lever are arranged outside the area in which the multiple head units are arranged in a staggered pattern in a direction perpendicular to the specified arrangement direction.

3. A base member; a plurality of head units arranged in a staggered manner along a predetermined arrangement direction on the base member, the head units having heads for ejecting liquid; a first arm that rotates about a first rotation fulcrum and fixes one end side of each of the plurality of head units and the other end sides of each of two head units that are arranged at both ends in the predetermined arrangement direction among the plurality of head units, at a first fixing position; a second arm that rotates about a second rotation fulcrum and fixes the other end side of each of the head units, except for two head units that are arranged at both ends in the predetermined arrangement direction, among the plurality of head units, at a second fixing position; the second fixing position is located closer to the center in a direction perpendicular to the predetermined arrangement direction in a region in which the plurality of head units are arranged in a staggered manner than the first fixing position; A head unit assembly, characterized in that the distance from the second pivot point of the second arm to the second fixed position is longer than the distance from the first pivot point of the first arm to the first fixed position.

4. 4. A head unit assembly as described in any one of claims 1 to 3, wherein the first arm and the second arm extend in a direction perpendicular to the specified arrangement direction when each of the plurality of head units is fixed.

5. 5. A liquid ejecting device comprising the head unit assembly according to claim 1.

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