JP2009137246A - Liquid jetting head unit and liquid jet apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid jetting head and a liquid jet apparatus which can attempt the multiple degradations of nozzle openings and can improve printing quality. <P>SOLUTION: A holding member 3 is provided with a reference surface D which is attached to a supporting member 230 to position a plurality of liquid injection heads 2. The supporting member 230 is abutted to the reference surface D and the head reference surface B stipulated based on the liquid injection surfaces A of the liquid injection heads 2. The supporting member 230 is constituted by laminating a plurality of plate shape supporting member constituting plates 231, 232. The supporting member constituting plate 231 abutted on the reference surface D and a head reference surface B is provided with a protruded part 240 formed by projecting from the surface by bending and the protruded part 240 is abutted on the reference surface D and the head reference surface B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid ejecting head unit and a liquid ejecting apparatus including a plurality of liquid ejecting heads that eject liquid and a holding member that holds the plurality of liquid ejecting heads.

  A liquid ejecting apparatus typified by an ink jet recording apparatus such as an ink jet printer or a plotter is configured by mounting a plurality of liquid ejecting heads for ejecting a liquid such as ink on a holding member such as a carriage.

  When holding a plurality of liquid jet heads on a holding member such as a carriage, the head reference surface defined by the liquid jet surface of the liquid jet head is brought into contact with one surface of the plate, and the reference surface of the holding member is set on the plate. The holding member holds the liquid jet head via the plate in contact with the other surface (see, for example, Patent Document 1).

JP 2000-272141 A (pages 3 to 5, FIGS. 1 to 4)

  However, if the plate thickness varies, the liquid ejection direction of each liquid ejecting head may vary, resulting in variations in the landing positions of liquids such as ink, and image quality degradation. There is a problem that occurs.

  Further, if the plate has low rigidity, the liquid ejecting directions of the liquid ejecting heads vary. For this reason, it is conceivable to increase the thickness of the plate in order to increase the rigidity of the plate. However, it is difficult to process the thick plate, and the plate becomes heavier, increasing the burden on the motor that operates the head unit. There is a problem.

  Such a problem is not limited to an ink jet recording head unit including a plurality of ink jet recording heads that eject ink, but also in a liquid ejecting head unit including a plurality of liquid ejecting heads that eject liquid other than ink. Exists.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting head unit and a liquid ejecting apparatus capable of increasing the number of rows of nozzle openings and improving print quality.

An aspect of the present invention that solves the above problems includes a plurality of liquid ejecting heads that include a head reference surface and a liquid ejecting surface that is formed on the liquid ejecting direction side of the head reference surface, and ejects liquid. An intermediate member that is in contact with the reference surface and holds the plurality of liquid ejecting heads, a support member that is in contact with the reference surface of the intermediate member in the same plane, and a plurality of liquid ejecting heads that are in contact with the support member And a holding member that holds the plurality of liquid ejecting heads in contact with the supporting member. The support member is in contact with the reference surface and the head reference surface in the same plane, and the support member is configured by stacking a plurality of support member constituting plates, and the reference surface and the head Standard The support member constituting plate that abuts on the surface is provided with a protrusion that protrudes from the surface by being bent, and the reference surface and the head reference surface are in contact with the protrusion. In the liquid jet head unit.
In this aspect, the plurality of liquid ejecting heads can increase the number of nozzle rows, and the head reference surface and the reference surface in the liquid ejecting direction are aligned on the same line. Even if the thickness varies, the height of the liquid ejecting surface in the liquid ejecting direction of the liquid ejecting head can be made uniform. Therefore, the print quality can be improved.

  In addition, since the support member is composed of a plurality of support member constituent plates and the support member constituent plates that are in contact with the holding member and the intermediate member are provided with protruding portions, the support member rigidity is improved. be able to. Therefore, a material having a relatively small thickness can be used as the support member constituting plate while maintaining the rigidity of the support member, and the liquid jet head unit can be reduced in weight and cost. Further, since the rigidity of the support member can be improved, it is possible to prevent warping from occurring even when stress is applied during assembly or when a cartridge or the like is mounted. Therefore, it is possible to prevent the surface accuracy from being lowered between the liquid jet heads due to the warp of the support member, and it is possible to improve the print quality.

  Further, since the support member is provided with a protrusion, and the tip end surface of the protrusion is in contact with the holding member and the intermediate member, the contact area can be reduced and the surface can be formed with high accuracy in a short time. . Therefore, cost can be reduced.

  Here, it is preferable that the holding member holds the intermediate member of the liquid jet head via the support member so that the reference surface and the head reference surface are aligned on the same line. According to this, even if the reference surface of the holding member and the head reference surface are provided in the opposite direction, the reference surface and the head reference surface can be aligned on the same line, and the holding member, the support member, and the intermediate member It is possible to reliably prevent a decrease in surface accuracy between the liquid ejecting heads due to the influence of the thickness variation of the members.

  Further, the intermediate member is formed by laminating a plurality of plate-shaped intermediate member constituting plates, and the intermediate member constituting plate contacting the support member and the head reference surface is bent from the surface. It is preferable that an intermediate protruding portion provided so as to protrude is provided. According to this, since the rigidity of the intermediate member can be improved, a relatively thin material can be used as the intermediate member constituting plate while maintaining the rigidity of the intermediate member. Weight reduction and cost reduction can be achieved. Further, by providing the intermediate projecting portion on the intermediate member, the contact area that contacts the support member and the liquid ejecting head can be reduced, and the surface can be formed with high accuracy in a short time. Therefore, cost can be reduced.

  Further, according to another aspect of the invention, a plurality of liquid ejecting heads that eject a liquid by including a head reference surface and a liquid ejecting surface that is formed closer to the liquid ejecting direction than the head reference surface, and the head reference surface A support member that contacts the support member, and a holding member that contacts the support member and holds the plurality of liquid jet heads via the support member. The holding member is in contact with the support member. A reference surface for positioning a plurality of liquid ejecting heads is provided, and the support member is in contact with the reference surface and the head reference surface within the same surface, and the support member includes a plurality of support member constituting plates. The support member constituting plate that is configured to be laminated and abuts on the reference surface and the head reference surface is provided with a protrusion that protrudes from the surface by being bent, and the protrusion includes the protrusion Reference plane and front Lying in the liquid jet head unit, characterized in that the head reference surface is in contact.

  In this aspect, the plurality of liquid ejecting heads can increase the number of nozzle rows, and the head reference surface and the reference surface in the liquid ejecting direction are aligned on the same line. Even if there is a variation, the height of the liquid ejecting surface in the liquid ejecting direction of the liquid ejecting head can be made uniform. Therefore, the print quality can be improved.

  In addition, the support member is composed of a plurality of support member constituting plates, and the support member constituting plate that comes into contact with the holding member and the liquid jet head is provided with a projecting portion that is bent and projected, thereby improving the rigidity of the support member. can do. Therefore, a material having a relatively small thickness can be used as the support member constituting plate while maintaining the rigidity of the support member, and the liquid jet head unit can be reduced in weight and cost. Further, since the rigidity of the support member can be improved, it is possible to prevent warping from occurring even when stress is applied during assembly or when a cartridge or the like is mounted. Therefore, it is possible to prevent the surface accuracy from being lowered between the liquid jet heads due to the warp of the support member, and it is possible to improve the print quality.

  Furthermore, since the support member is provided with a protrusion, and the tip surface of the protrusion is in contact with the holding member and the liquid jet head, the contact area can be reduced and the surface can be formed with high accuracy in a short time. it can. Therefore, cost can be reduced.

  Moreover, it is preferable that the said protrusion part is formed in the state in which the side surface was closed between the support member structure board in which the said protrusion part is not provided. According to this, the rigidity of the support member can be further improved.

  The support member constituting plate provided with the protrusion is provided with a fixing hole for fixing a fastening member for fixing the liquid ejecting head, and the support member not provided with the protrusion. The component plate is preferably provided with a relief hole having an inner diameter larger than that of the fixed hole. According to this, the support member constituting plate provided with the protruding portion can perform the alignment in the in-plane direction of the nozzle opening of the liquid ejecting head and the alignment in the liquid ejecting direction with respect to the same member, Highly accurate positioning can be performed.

  Moreover, it is preferable that the holding member is a carriage provided so as to be movable in the main scanning direction. According to this, when mounting a plurality of liquid ejecting heads on the carriage, it can be easily assembled by the support member.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head unit according to the above aspect.
In this aspect, a liquid ejecting apparatus with improved printing quality can be realized.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1 is a schematic diagram illustrating an ink jet recording apparatus that is an example of a liquid ejecting apparatus according to Embodiment 1 of the invention. As shown in FIG. 1, the ink jet recording apparatus I includes an ink jet recording head unit 1. The ink jet recording head unit 1 includes a plurality of ink jet recording heads 2 in which cartridges constituting ink supply means are detachably provided, and a carriage 3 that is a holding member on which the ink jet recording head 2 is mounted. ing.

  The carriage 3 of the ink jet recording head unit 1 is provided on a carriage shaft 5 attached to the apparatus main body 4 so as to be movable in the axial direction. In addition, the two ink jet recording heads 2 of the ink jet recording head unit 1 discharge, for example, a black ink composition and a color ink composition, respectively.

  Then, the driving force of the driving motor 6 is transmitted to the carriage 3 via a plurality of gears and a timing belt 7 (not shown), whereby the carriage 3 on which the ink jet recording head 2 is mounted (that is, the ink jet recording head unit 1). Is moved along the carriage shaft 5 (main scanning direction). On the other hand, the apparatus body 4 is provided with a platen 8 along the carriage shaft 5, and a recording sheet S, which is a recording medium such as paper fed by a not-shown paper feed roller, is moved on the platen 8 in the sub-scanning direction. It is designed to be conveyed.

  Here, the ink jet recording head unit 1 which is an example of the liquid jet head unit of the present embodiment will be described in detail. 2 is an exploded perspective view showing a schematic configuration of an ink jet recording head unit which is an example of a liquid jet head unit according to Embodiment 1 of the present invention. FIG. 3 is a plan view of a support member. FIG. 4 is a schematic cross-sectional view of the ink jet recording head unit in the direction of the line AA ′ of FIG.

  As shown in FIGS. 2 and 4, the ink jet recording head unit 1 of the present embodiment includes a plurality of ink jet recording heads 2 that eject ink as a liquid and a plurality of ink jet recording heads 2 via an intermediate member 220. And a carriage 3 that is a holding member that holds the plurality of ink jet recording heads 2 via the intermediate member 220 and the support member 230.

  The ink jet recording head 2 includes a head main body 200 in which a liquid ejection surface A (ink ejection surface) for ejecting ink (liquid) is provided on one surface side, and a surface opposite to the liquid ejection surface A of the head main body 200. And a cartridge case 210 provided in the container.

  The liquid ejecting surface A of the ink jet recording head 2 is a surface on which a nozzle opening for ejecting ink droplets (liquid) of the head main body 200 is opened, and is formed on the liquid ejecting direction side of the head reference surface B described later. Has been.

  The cartridge case 210 is provided on the side opposite to the liquid ejecting surface A of the head main body 200 and can mount a liquid storage portion such as an ink cartridge in which ink is stored.

  The cartridge case 210 includes a head reference surface B defined by the liquid ejection surface A of the head body 200. In the present embodiment, the cartridge case 210 has a flange portion 214 protruding from the side surface, and a surface in the same direction as the liquid ejection surface A of the flange portion 214 is used as the head reference surface B. The head reference surface B is provided such that the distance from the liquid ejection surface A in the ink ejection direction (liquid ejection direction) is the same distance in the plurality of ink jet recording heads 2. As described above, the head reference surface B is defined by the liquid ejecting surface A, so that when the cartridge case 210 is attached to another member, the head reference surface B and the reference surface of the other member are in the surface direction. When the cartridge case 210 is attached to another member, the liquid ejecting surface A is automatically aligned on the same line in the surface direction with respect to the reference surface of the other member. It is not necessary to adjust A so that A is parallel to the reference plane of the other member in the plane direction. The cartridge case 210 need not be composed of a single member, and may be configured by combining a plurality of members, provided that there is a surface (area) that can conceptualize the head reference surface B. There are no fine restrictions on the shape.

  The carriage 3 is a holding member that holds the plurality of ink jet recording heads 2 and is mounted on the ink jet recording apparatus I and provided to be movable in the main scanning direction as described above. Here, the main scanning direction is a direction orthogonal to the sub-scanning direction, which is the transport direction of a recording medium such as paper in the ink jet recording apparatus.

  In this embodiment, the carriage 3 has a box shape that opens to the upper side, and has a holding portion 3 a that is one opening that holds a plurality of ink jet recording heads 2 on the bottom surface. Of course, the carriage 3 is not limited to a box shape, and may be, for example, a plate shape. The shape is not particularly limited as long as the carriage 3 can be mounted on the ink jet recording apparatus I (liquid ejecting apparatus). However, it is necessary to have the holding part 3a even if it is other than the box shape.

  The carriage 3 holds a plurality of ink jet recording heads 2 via at least the support member 230. In the present embodiment, the carriage 3 holds a plurality of ink jet recording heads 2 via a support member 230 and an intermediate member 220.

  The intermediate member 220 is a plate-like member provided independently for each ink jet recording head 2, and has an opening that is larger than the head main body 200 of the ink jet recording head 2 and smaller than the flange portion 214 of the cartridge case 210. The head protrusion hole 221 is provided.

  Such an intermediate member 220 is fixed with one surface being in contact with the head reference surface B in a state where the head main body 200 of the ink jet recording head 2 is protruded from the head protrusion hole 221. That is, in this embodiment, the surface in the same direction as the liquid ejecting surface A of the flange portion 214 of the cartridge case 210 is used as the head reference surface B. By providing the intermediate member 220 that contacts the head reference surface B, the flange is provided. The head reference surface B of the portion 214 is transferred to the one surface of the intermediate member 220 as a transfer surface C indicating the same position.

  As shown in FIGS. 3 and 4, the support member 230 is configured by laminating a plurality of plate-like support member constituting plates, and is provided continuously over the plurality of ink jet recording heads 2. In the present embodiment, a two-plate configuration of a plate-like fixing plate 231 and a reinforcing plate 232 fixed to the fixing plate 231 is adopted. Note that the number of the support members 230 is not particularly limited as long as the support members 230 are composed of two or more support member constituent plates.

  In the support member 230 configured by the fixing plate 231 and the reinforcing plate 232, the head holding hole 233 having an opening larger than the head protruding hole 221 of the intermediate member 220 and smaller than the outer periphery of the intermediate member 220. Is provided for each ink jet recording head 2. In this embodiment, since two ink jet recording heads 2 are mounted on the support member 230, the support member 230 is provided with two head holding holes 233. Further, the head holding hole 233 has a length corresponding to the length of the nozzle openings arranged side by side in the direction in which the ink jet recording heads 2 are arranged side by side when the ink jet recording head 2 is held via the intermediate member 220. It is provided so as to be held by being shifted. That is, the two head holding holes 233 are provided at a predetermined interval in the direction in which the nozzle openings are arranged. Accordingly, the outer periphery of the support member 230 has a shape in which a pair of opposite corners of a rectangular plate are cut away so as to be substantially the same distance from the head holding hole 233.

  The support member 230 is in contact with the transfer surface C of the intermediate member 220 of the ink jet recording head 2 at the surface of the fixing plate 231, that is, the surface opposite to the surface of the fixing plate 231 on which the reinforcing plate 232 is fixed. The ink jet recording head 2 is held. That is, the transfer surface C of the intermediate member 220 is substantially the head reference surface B of the ink jet recording head 2. The support member 230 is held by the carriage 3 in a state where the surface of the fixed plate 231 with which the intermediate member 220 of the ink jet recording head 2 is in contact with the reference surface D of the carriage 3. That is, the support member 230 is provided so that the surface of the fixed plate 231 comes into contact with the head reference surface B of the ink jet recording head 2 and the reference surface D of the carriage 3.

  The fixing plate 231 constituting the support member 230 is provided with a region that abuts on the carriage 3 and a region that abuts on the ink jet recording head 2 (the intermediate member 220 in this embodiment) bent and protrudes from the surface. A protrusion 240 is provided.

  Specifically, the fixed plate 231 is provided with a head protruding portion 241 provided on each of the four sides around each head holding hole 233 so as to protrude by being bent so that the cross section has a trapezoidal shape. It has been. That is, the fixed plate 231 is provided with four head protrusions 241 for each head holding hole 233, and the front end surface of the head protrusion 241 is in contact with each ink jet recording head 2. The support member 230 holds each inkjet recording head 2.

  In addition, the fixing plate 231 is provided with holding member protrusions 242 at predetermined intervals on the outer peripheral side thereof, and the holding member protrusions 242 are in contact with the carriage 3 that is the holding member in the carriage. 2, the support member 230 is held. In the present embodiment, the holding member protrusions 242 are provided at the respective corners on the outer periphery of the fixing plate 231. That is, in the present embodiment, six acute corner portions are provided on the outer periphery of the fixing plate 231. Therefore, six holding member protrusions 242 are provided.

  As described above, in this embodiment, the fixed plate 231 that is the support member constituting plate constituting the support member 230 has eight head protrusions 241 and 6 as the protrusions 240 that protrude from the surface by being bent. One holding member protrusion 242 is provided. And these protrusion parts 242 are formed with high surface precision by grinding | polishing etc. with all the front end surfaces having the same height.

In addition, a reinforcing plate 232 is fixed to the surface opposite to the surface on which the protruding portion 240 of the fixing plate 231 protrudes. The reinforcing plate 232 is a flat plate, and is provided over one surface of the fixed plate 231 so that a space is formed between the reinforcing plate 232 and the protruding portion 240. By providing the reinforcing plate 232 on the support member 230 as described above, the rigidity of the entire support member 230 can be improved. In the present embodiment, since the protruding portion 240 is formed by bending the fixing plate 231 so that the cross section has a trapezoidal shape, the side surface of the protruding portion 240 does not open to the outside. Thereby, the rigidity of the support member 230 can be further improved. Of course, the shape of the protrusion 240 is not limited to this, and the protrusion 240 may be formed in a shape other than a trapezoidal cross section, and the side surface of the protrusion 240 is open to the outside. It is good.
Such a fixed plate 231 can be easily formed at low cost by pressing a plate-like member.

  Here, the fixing method of the fixing plate 231 and the reinforcing plate 232 is not particularly limited, but in this embodiment, the screw member 250 made of a countersunk screw is inserted into the reinforcing plate 232 and the tip thereof is screwed to the fixing plate 231. Both were fixed by combining them. In this way, by fixing the fixing plate 231 and the reinforcing plate 232 to each other by the screw member 250, unnecessary stress for fixing the fixing plate 231 and the reinforcing plate 232 is not applied, and the protrusion 240 has It is possible to reliably prevent the surface accuracy of the tip surface from being lowered. Here, the place where the support member 230 is fixed to the carriage 3 as a holding member may be any place, but the place where the support member 230 abuts on the carriage 3 is preferable.

  In the present embodiment, the screw member 250 is provided as a screw member 250 so that the screw member 250 does not protrude from the surface of the reinforcing plate 232, but an ink jet recording head in which the screw member 250 is fixed to the support member 230. In the case where the screw member 250 is provided at a position that does not affect the carriage 2 or the carriage 3, a normal male screw may be used as the screw member 250. Either the front end or the rear end of the screw member 250 may be used, but that end portion is obstructed when the upper surface of the reinforcing plate 232 is pressed against some member to form the protruding portion 240 of the fixing plate 231 by polishing. In addition, it is preferable that the end portion of the screw member 250 not protrude above the upper surface of the reinforcing plate 232.

  Further, in the present embodiment, the plurality of support member constituting plates are fixed to each other by the screw member 250, but the fixing method of the plurality of support member constituting plates is not particularly limited to this, for example, as shown in FIG. In addition, a plurality of support member constituting plates (fixing plate 231 and reinforcing plate 232) may be fixed to each other by caulking. That is, in FIG. 5A, the first opening 234 is provided in the fixing plate 231, the second opening 235 having a smaller inner diameter than the first opening 234 is provided in the reinforcing plate 232, and the second The opening edge portion of the opening portion 235 is fixed by so-called burring, in which the opening edge portion of the opening portion 235 is bent and inserted into the first opening portion 234. 5B, the reinforcing plate 232 is provided with a notch 236, the fixing plate 231 is provided with a flange 237, and the flange 237 is bent and inserted into the notch 236 to fix the both. is doing. Of course, caulking such as rivets may be used instead of the screw member 250. Thus, the manufacturing cost can be reduced by fixing the plurality of supporting member constituting plates by caulking.

  Such a support member 230 is configured so that the tip surface of the head protrusion 241 of the fixed plate 231 contacts the ink jet recording head 2 and the holding member protrusion 242 contacts the carriage 3. The head reference surface B of 2 and the reference surface D of the carriage 3 are provided so as to be aligned on the same line in the surface direction. That is, the front end surface of the head projecting portion 241 of the support member 230 and the head reference surface B of the ink jet recording head 2 are collinear in the surface direction via the transfer surface C of the intermediate member 220 that abuts them. It's aligned. Further, the reference surface D of the carriage 3 and the front end surface of the holding member protrusion 242 are in contact with each other, so that the reference surface D of the carriage 3 and the front end surface of the holding member protrusion 242 are in the same line in the surface direction. It's aligned. The head protrusion 241 and the holding member protrusion 242 are all formed at the same height and with high surface accuracy, so that the reference surface D of the carriage 3 and the head of the ink jet recording head 2 are used. The reference surface B can be provided so as to be aligned with high accuracy on the same line in the surface direction via the support member 230.

  Therefore, even when the reference surface D of the carriage 3 and the head reference surface B of the ink jet recording head 2 are provided in directions opposite to each other, the head reference surface B and the reference surface C are aligned on the same line. Thus, the heights of the liquid ejecting surfaces (ink ejection surfaces) of the plurality of ink jet recording heads 2 in the liquid ejecting direction can be made uniform, and the print quality can be improved. Incidentally, for example, when the head reference surface B of the ink jet recording head 2 is joined to one surface side of the plate-like member and the other surface side of the plate-like member is joined to the reference surface D of the carriage 3, the thickness of the plate-like member is increased. Due to the variation in the height, the height of the liquid ejection surface in the liquid ejection direction of each ink jet recording head 2 varies. Further, since it is difficult to form the plate-like member while suppressing variations in thickness, the manufacturing cost of the plate-like member increases. In contrast, in the present embodiment, the inkjet recording head 2 is provided with an intermediate member 220 that contacts the head reference surface B, and further contacts the surface (transfer surface C) of the intermediate member 220 that contacts the head reference surface B. At the same time, since the support member 230 that abuts the reference surface D of the carriage 3 on the same surface (the front end surface of the protruding portion 240) is provided, even if the thickness of the carriage 3, the support member 230, and the intermediate member 220 varies. The height of the liquid ejection surface in the liquid ejection direction of the ink jet recording head 2 can be made uniform. Therefore, the print quality can be improved.

  Further, the support member 230 is composed of a plurality of support member constituent plates, that is, a fixing plate 231 and a reinforcing plate 232, and is bent to a fixing plate 231 that is a support member constituent plate that comes into contact with the ink jet recording head 2 to be bent from the surface. A projecting portion 240 is provided, and the leading end surface of the projecting portion 240 abuts on the transfer surface C of the intermediate member 220 that abuts the head reference surface B of the ink jet recording head 2 and the reference surface D of the carriage 3 that is a holding member. Therefore, it is only necessary that the surface accuracy of only the tip surface of the protrusion 240 is high. That is, in order to improve the surface accuracy of the entire surface using a flat plate member as the support member 230, long time polishing is required and the cost increases. However, the protrusion 240 is provided on the fixed plate 231. Thus, it is only necessary to polish the tip surface of the projecting portion 240 with a small area, and the polishing time can be shortened and the surface accuracy can be easily improved.

  In addition, the support member 230 includes a plurality of support member constituting plates, that is, a fixing plate 231 and a reinforcing plate 232, and the protrusion 240 that protrudes from the surface by bending the fixing plate 231 is provided. Stiffness can be improved. Therefore, while the rigidity of the support member 230 is maintained, a relatively thin material can be used for each of the fixing plate 231 and the reinforcing plate 232, and the ink jet recording head unit 1 can be reduced in weight and cost. be able to. That is, in order to improve the rigidity of the support member 230, it is not necessary to increase the thickness of the support member with a single member or a laminated member, and it is not necessary to process a thick support member, thereby reducing the cost. it can.

  Further, since the rigidity of the support member 230 can be improved, the support member 230 is deformed by stress when the support member 230 is fixed to the carriage 3 or when an ink cartridge or the like is fixed to the ink jet recording head 2. Can be reliably prevented. Therefore, it is possible to prevent the surface accuracy from being lowered between the ink jet recording heads 2 due to the warp of the support member 230, and to improve the printing quality.

  The material of the fixing plate 231 and the reinforcing plate 232 may be any material such as metal, resin, ceramic, etc. In order to obtain surface accuracy at the tip surface of the protrusion 240, the material of the fixing plate 231 is used. It is preferable to use a material with relatively high hardness and low cost, and it is preferable to use a metal. Moreover, since the reinforcing plate 232 does not require surface accuracy, the material is not particularly limited. Furthermore, the fixed plate 231 can be easily formed at a low cost by, for example, pressing or injection molding.

  Further, each ink jet recording head 2 and the support member 230 may be detachably provided by a fastening member such as a screw or a clip. Of course, the intermediate member 220 and the cartridge case 210 may be detachably provided. In this embodiment, as shown in FIG. 3B, a fastening member (not shown) such as a male screw that fixes the intermediate member 220 of the ink jet recording head 2 is screwed onto the fixing plate 231 of the support member 230. A fixing hole 238 is provided, and a relief hole 239 having an inner diameter larger than that of the fixing hole 238 is provided in the reinforcing plate 232. Accordingly, each ink jet recording head 2 can be fixed only to the fixing hole 238 of the fixing plate 231, and positioning in the surface direction of the liquid ejection surface A and positioning in the ink discharge direction can be performed on one fixing plate 231. Therefore, it is possible to position the ink jet recording head 2 on the support member 230 with high accuracy. Further, since the escape hole 239 of the reinforcing plate 232 has an inner diameter larger than that of the fixing hole 238, it is not necessary to align the fixing plate 231 and the reinforcing plate 232 with high accuracy, and the assembly can be easily performed.

  Further, the carriage 3 and the support member 230 may be detachably provided by a fastening member such as a screw (not shown) or a clip.

(Embodiment 2)
FIG. 6 is a cross-sectional view of an ink jet recording head unit that is an example of a liquid ejecting head unit according to Embodiment 2 of the invention. In addition, the same code | symbol is attached | subjected to the member similar to Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  The ink jet recording head unit 1A of the present embodiment includes an ink jet recording head 2 and a carriage 3 that is a holding member that holds the ink jet recording head 2 via an intermediate member 220A and a support member 230A.

  In the present embodiment, the intermediate member 220A is configured by laminating a plurality of intermediate member constituting plates. Specifically, the intermediate fixing plate 222 and the intermediate reinforcing plate 223 are fixed to each other, and are in contact with the head reference surface B of the intermediate fixing plate 222 and the tip surface of the protruding portion 240 of the support member 230. Is provided with an intermediate projecting portion 224 which is provided by projecting from the surface by being bent. The intermediate fixing plate 222 and the intermediate reinforcing plate 223 are fixed by the same members and fixing methods as the fixing plate 231 and the reinforcing plate 232 constituting the support member 230 described above, and the intermediate protruding portion 224 is described above. The protruding portion 240 has the same shape.

  The front end surface of the intermediate protrusion 224 contacts the head reference surface B of the cartridge case 210 and also contacts the front end surface of the head protrusion 241 of the support member 230.

  By configuring the intermediate member 220A in this manner, the rigidity can be improved without increasing the thickness of the intermediate member 220A, and the surface accuracy of the front end surface of the intermediate protrusion 224 of the intermediate member 220A can be easily increased. The cost can be reduced and the print quality can be improved.

  Note that members other than the intermediate member 220A, that is, the head main body 200, the cartridge case 210, the carriage 3, and the support member 230 are the same as those in the first embodiment described above, and redundant descriptions are omitted.

(Embodiment 3)
FIG. 7 is a cross-sectional view of an ink jet recording head unit which is an example of a liquid jet head unit according to Embodiment 3 of the invention. In addition, the same code | symbol is attached | subjected to the member similar to Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  The ink jet recording head unit 1B of the present embodiment includes an ink jet recording head 2 and a carriage 3A that is a holding member that holds the ink jet recording head 2 via a support member 230A.

  The support member 230 </ b> A is provided with a head holding hole 233 </ b> A having an opening larger than the head main body 200 of the ink jet recording head 2 and having an opening smaller than the flange portion 214 of the cartridge case 210.

  In addition, the carriage 3A is provided so that the reference plane D ′ on which the support member 230A is held in contact with the support member 230A is in the same direction as the droplet ejection surface A.

  The support member 230 </ b> A includes a fixed plate 231 and a reinforcing plate 232 as in the first embodiment described above. Further, the fixed plate 231 includes a protruding head portion 241 that protrudes in contact with the head reference surface B of the ink jet recording head 2 and a holding member that protrudes in contact with the reference surface D ′ of the carriage 3A. A projecting portion 240 including the projecting portion 242 is provided.

  In such an ink jet recording head unit 1B, the head reference surface B of the ink jet recording head 2 is brought into contact with the front end surface of the head protrusion 241 of the support member 230A, and the head protrusion 241 of the support member 230A. Since the front end surface of the holding member protrusion 242 having the same height as the front end surface is in contact with the reference surface D ′ of the carriage 3A, the reference surface D ′ of the carriage 3A is collinear with the head reference surface B in the surface direction. Will be aligned.

  Even with this configuration, the same effects as those of the first embodiment described above can be achieved.

(Other embodiments)
As mentioned above, although Embodiment 1-3 of this invention was demonstrated, the basic composition of this invention is not limited to what was mentioned above. For example, in Embodiments 1 to 3 described above, four protrusions 241 for heads and six protrusions 242 for holding members are provided for each inkjet recording head 2 as the protrusions 240 on the support members 230 and 230A. However, the number and shape of the protrusions 240 are not limited to those described above. For example, the head protrusion 241 may be provided around the opening of the head holding hole 233, or the holding member protrusion 242 may be provided around the support members 230 and 230A. . Similarly, the number and shape of the intermediate protrusions 224 described in the second embodiment are not particularly limited.

  Furthermore, in Embodiments 1 to 3 described above, the protrusions 240 that are bent and protrude only in the regions of the support members 230 and 230A that contact the ink jet recording head 2 and the carriages 3 and 3A are provided. A bent portion may be provided in a region that does not contact the other members of H.231. Thereby, the rigidity of the fixed plate 231 can be further improved. In addition, when providing a bending part in the area | region which does not contact | abut the other member of the fixing plate 231, the shape of a bending part is not specifically limited, It is good also as a shape similar to a protrusion part, and the cross section is V-shaped bending. Part. Of course, an opening may be provided on the reinforcing plate 232 side, and the bent portion may protrude toward the reinforcing plate 232 side.

  In Embodiments 1 to 3 described above, the reinforcing plate 232 is provided over the entire surface on the side opposite to the direction in which the protruding portion 240 of the fixing plate 231 protrudes. For example, you may make it form an opening part in the area | region in which the protrusion part is not provided. Thus, when providing an opening in the reinforcing plate 232, it is necessary to provide the opening appropriately at a position where the rigidity of the support members 230 and 230A does not decrease. However, providing the opening in this way further supports the opening. The members 230 and 230A can be reduced in weight, and the carriages 3 and 3A can be driven at high speed.

  Further, in Embodiments 1 to 3 described above, although not specifically mentioned, positioning pins used for positioning with the carriages 3 and 3A, which are other members, and the ink jet recording head 2 are inserted into the support members 230 and 230A. A positioning hole may be provided. As described above, when the positioning holes are provided in the support members 230 and 230A, if the positioning holes are provided only in the fixing plate 231 and the escape holes larger than the positioning holes are provided in the reinforcing plate 232, the positioning of each member is determined. Can be performed with high accuracy.

  In the first to third embodiments described above, the plurality of ink jet recording heads 2 are held by the carriages 3 and 3A, which are holding members. However, the holding members are not particularly limited thereto. For example, in a line-type recording apparatus that performs printing only by moving a recording medium such as paper in the sub-scanning direction, a holding member that fixes a plurality of ink-jet recording heads to the apparatus main body can be used.

  In the first to third embodiments, the specific structure of the ink jet recording head 2 has not been described in detail, but the structure of the ink jet recording head 2 is not limited. Ink-jet recording heads having piezoelectric elements, longitudinal vibration-type ink-jet recording heads in which piezoelectric materials and electrode-forming materials are alternately stacked to expand and contract in the axial direction, bubbles generated by heat generated by heating elements, etc. Inkjet recording heads with various structures, such as inkjet recording heads that discharge, inkjet recording heads that generate static electricity between the diaphragm and electrodes, deform the diaphragm by electrostatic force, and eject droplets from the nozzle openings Needless to say, the present invention can be applied to a head unit having a recording head.

  The head unit and the ink jet recording apparatus having an ink jet recording head that ejects ink as the liquid ejecting head have been described as an example. It is intended. Examples of the liquid ejecting head include a recording head used for an image recording apparatus such as a printer, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an organic EL display, and an electrode formation such as an FED (field emission display). Electrode material ejecting heads used in manufacturing, bioorganic matter ejecting heads used in biochip production, and the like.

1 is a schematic diagram of an ink jet recording apparatus according to Embodiment 1. FIG. FIG. 2 is an exploded perspective view of the ink jet recording head unit according to the first embodiment. 3 is a plan view of a support member according to Embodiment 1. FIG. 1 is a schematic cross-sectional view of an ink jet recording head according to Embodiment 1. FIG. FIG. 6 is a cross-sectional view of a main part showing another example of a support member according to Embodiment 1. 6 is a schematic cross-sectional view of an ink jet recording head unit according to Embodiment 2. FIG. 6 is a schematic cross-sectional view of an ink jet recording head unit according to Embodiment 3. FIG.

Explanation of symbols

  A liquid ejecting surface, B head reference surface, C transfer surface, D, D ′ reference surface, I ink jet recording apparatus (liquid ejecting apparatus), 1, 1A, 1B ink jet recording head unit (liquid ejecting head unit), 2 Inkjet recording head (liquid ejecting head) 3, 3, 3A carriage, 200 head body, 210 cartridge case, 220, 220A intermediate member, 230, 230A support member, 231 fixing plate (support member constituting plate), 232 reinforcement plate (support) Member component plate), 240 projecting portion, 241 head projecting portion, 242 holding member projecting portion

Claims (8)

A plurality of liquid ejecting heads that eject liquid by including a head reference surface and a liquid ejecting surface formed on the liquid ejecting direction side of the head reference surface;
An intermediate member that contacts the head reference surface and holds a plurality of liquid jet heads;
A support member that abuts in the same plane as the head reference surface of the intermediate member;
A holding member that abuts the support member and holds the plurality of liquid jet heads via the support member and the intermediate member,
The holding member is provided with a reference surface that contacts the support member to position the plurality of liquid ejecting heads, and the support member is disposed on the reference surface and the head reference surface within the same surface. Abut,
The support member is formed by laminating a plurality of support member constituting plates, and the support member constituting plate contacting the reference surface and the head reference surface is provided to protrude from the surface by being bent. A liquid ejecting head unit, comprising: a protrusion, wherein the reference surface and the head reference surface are in contact with the protrusion.   The liquid according to claim 1, wherein the holding member holds the intermediate member of the liquid jet head via the support member so that the reference surface and the head reference surface are aligned on the same line. Jet head unit.   The intermediate member is formed by laminating a plurality of plate-shaped intermediate member constituting plates, and the intermediate member constituting plate contacting the support member and the head reference surface is bent to protrude from the surface. The liquid ejecting head unit according to claim 2, wherein an intermediate projecting portion is provided. A plurality of liquid ejecting heads that eject liquid by including a head reference surface and a liquid ejecting surface formed on the liquid ejecting direction side of the head reference surface;
A support member in contact with the head reference surface;
A holding member that contacts the support member and holds the plurality of liquid jet heads via the support member,
The holding member is provided with a reference surface that contacts the support member to position the plurality of liquid ejecting heads, and the support member is disposed on the reference surface and the head reference surface within the same surface. Abut,
The support member is formed by laminating a plurality of support member constituting plates, and the support member constituting plate contacting the reference surface and the head reference surface is provided to protrude from the surface by being bent. A liquid ejecting head unit, comprising: a protrusion, wherein the reference surface and the head reference surface are in contact with the protrusion.   5. The liquid according to claim 1, wherein the protruding portion is formed in a state in which a side surface is closed between the protruding portion and a support member constituting plate not provided with the protruding portion. Jet head unit.   The support member constituting plate provided with the protruding portion is provided with a fixing hole for fixing a fastening member for fixing the liquid ejecting head, and the support member constituting plate not provided with the protruding portion. The liquid ejecting head unit according to claim 1, wherein an escape hole having an inner diameter larger than the fixed hole is provided.   The liquid ejecting head unit according to claim 1, wherein the holding member is a carriage provided to be movable in the main scanning direction.   A liquid ejecting apparatus comprising the liquid ejecting head unit according to claim 1.