JP2012091377A - Liquid jet head, and liquid jet apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid jet head, which is capable of improving durability by preventing destruction of a boss, and which is capable of miniaturization, and to provide a liquid jet apparatus.SOLUTION: The liquid jet head includes a tube for supplying liquid from a storage unit where the liquid is stored, a fixing part 41 for fixing the tube, a boss 312 provided with a fixing hole 313 where a threaded member 50 for fixing the fixing part 41 is threaded, and the threaded member 50 for fixing the fixing part 41 to the boss 312. Between the threaded member 50 and the fixing hole 313, a relief part 60 being a gap not threaded into the threaded member 50 is provided at a region corresponding to an opening edge of the fixing hole 313.

Description

  The present invention relates to a liquid ejecting head and a liquid ejecting apparatus that eject liquid from nozzle openings, and more particularly to an ink jet recording head and an ink jet recording apparatus that eject ink as liquid.

  An ink jet recording head, which is a typical example of a liquid ejecting head, generates pressure fluctuations in a pressure generating chamber communicating with a nozzle opening, and ejects ink droplets from the nozzle opening. A head body provided with a nozzle opening And a liquid supply member that supplies ink from a storage unit that is fixed to the head body and stores the ink to the head body (see, for example, Patent Documents 1 and 2).

  The liquid supply member used in such an ink jet recording head is provided with a liquid supply path having a valve mechanism or the like inside, and the liquid supply member receives ink from a storage unit that stores ink. Supplied through a tube.

JP 2002-36583 A JP 2007-260949 A

  In such a liquid supply member, the connection of the tube is fixed by fastening a fixing portion fixed to the tip of the tube to the liquid supply member. Specifically, the screw member inserted through the fixing portion is fixed by being screwed into a fixing hole of a boss provided in the liquid supply member. At this time, the fastening of the screw member causes a crack such as a crack starting from the tip of the boss, and there is a problem that ink leaks due to insufficient fastening of the fixing portion and the liquid supply member.

  In particular, when performing maintenance such as repair or replacement of the ink jet recording head, the tube (fixed portion) is attached to or detached from the ink jet recording head (liquid supply member). Boss cracks are likely to occur due to repetition.

  In addition, in order to suppress cracking of the boss, it is conceivable to increase the thickness around the fixing hole of the boss. However, the problem is that the ink jet recording head is enlarged as the area of the liquid supply member is increased. There is.

  In view of such circumstances, it is an object of the present invention to provide a liquid ejecting head and a liquid ejecting apparatus that can suppress the destruction of a boss, improve durability, and can be downsized.

An aspect of the present invention that solves the above problem is a fixing in which a tube that supplies liquid from a storage unit that stores liquid, a fixing portion that fixes the tube, and a screw member that fixes the fixing portion are screwed together. A boss provided with a hole, and a screw member for fixing the fixing portion to the boss, and a region between the screw member and the fixing hole corresponding to an opening edge of the fixing hole. In the liquid ejecting head, an escape portion that is a gap that is not screwed to the screw member is provided.
In this aspect, by providing an escape portion between the fixing hole and the screw member at the opening edge of the fixing hole, the screw member is applied to the opening edge of the fixing hole when the screw member is screwed into the fixing hole. Stress can be reduced and cracks at the tip of the boss can be suppressed. Moreover, since the crack of a boss | hub can be suppressed by an escape part, it is not necessary to form a boss | hub thickly and size reduction can be achieved.

  Here, it is preferable that the escape portion is formed by a recess provided in a region facing the opening edge of the fixing hole of the screw member. According to this, it is possible to suppress the occurrence of cracks applied to the tip of the boss only by changing the screw member, and the cost can be reduced.

  In addition, the fixing portion is fixed to the boss via a pinching member, and the pinching member is provided with an insertion hole through which the screw member is inserted, and is opposed to the insertion hole of the screw member. The region is preferably provided with a rattling prevention portion having an outer diameter larger than that of the recess. According to this, rattling of the sandwiching member can be suppressed by the rattling prevention portion.

  Further, it is preferable that the escape portion is formed by a large diameter portion that is provided at an opening edge portion of the fixing hole and has a larger inner diameter than a region where the screw member is screwed. According to this, an escape part can be easily formed by a large diameter part, without changing a screw member.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head according to the above aspect.
In this aspect, even if the fixing portion is repeatedly attached and detached by attaching and detaching the liquid ejecting head, the liquid outflow can be suppressed and a highly reliable liquid ejecting apparatus can be realized.

FIG. 2 is a perspective view of a recording head according to Embodiment 1 of the invention. FIG. 3 is a plan view of the recording head according to the first embodiment of the invention. FIG. 3 is a cross-sectional view of the recording head according to the first embodiment of the invention. FIG. 3 is an enlarged cross-sectional view of a main part of the recording head according to Embodiment 1 of the invention. It is sectional drawing of the head main body which concerns on Embodiment 1 of this invention. FIG. 6 is an enlarged cross-sectional view of a main part of a recording head according to Embodiment 2 of the invention. 1 is a schematic perspective view of a recording apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1 is a perspective view of an ink jet recording head that is an example of a liquid jet head according to Embodiment 1 of the present invention, FIG. 2 is a plan view of the ink jet recording head, and FIG. FIG. 4 is an enlarged cross-sectional view of a main part of FIG.

  As illustrated, an ink jet recording head 1 that is an example of a liquid ejecting head according to Embodiment 1 of the present invention includes a head main body 10 that ejects ink, a liquid supply member 30 that supplies ink to the head main body 10, and A tube 40 that supplies ink from a storage unit that stores ink to the liquid supply member 30 and a screw member 50 that fixes the tube 40 to the liquid supply member 30 are provided.

  In the liquid supply member 30, the tube 40 is fixed to one surface, and the head body 10 is fixed to the surface opposite to the one surface, and the ink supplied from the storage means (not shown) via the tube 40 is supplied. Is supplied to the head main body 10.

  Such a liquid supply member 30 has a box shape in which a liquid supply path 321 is provided inside, and a fixing portion 41 fixed to the tip of the tube 40 is fixed to one surface. Further, the head body 10 is fixed to the surface of the liquid supply member 30 opposite to the surface on which the fixing portion 41 is fixed. Then, the liquid supply member 30 supplies ink from the tube 40 to the head body 10 via the internal liquid supply path 321.

  Here, the liquid supply member 30 will be described in detail. As shown in FIG. 3, the liquid supply member 30 includes a case member 310, a flow path member 320 that is held inside the case member 310 and provided with a liquid supply path 321, and the flow path member 320 is disposed in the case member 310. And a sealing member 340 that is provided between the flow path member 320 and the lid member 330 and prevents the liquid from flowing out from the liquid supply path 321.

  The case member 310 has a hollow box shape in which a holding portion 311 in which the flow path member 320 is held is provided, and one surface of the holding portion 311 is open. The surface of the case member 310 where the holding portion 311 opens is sealed by the lid member 330. Further, the head body 10 is fixed to the surface opposite to the surface sealed by the lid member 330 of the case member 310.

  In addition, the case member 310 is provided with a plurality of bosses 312 that protrude from the bottom surface of the holding portion 311 to the opening side of the holding portion 311. The boss 312 has a cylindrical shape in which a fixing hole 313 is opened at the distal end surface. In the present embodiment, two bosses 312 are provided at one corner of the case member 310. By providing the boss 312, the fixing portion 41 of the tube 40 can be fixed to the case member 310 at a position higher than the bottom surface of the holding portion 311.

  Such a case member 310 can be formed inexpensively by molding using, for example, a resin material. When the case member 310 is formed by molding a resin material, a weld (not shown) that is a confluence of resin is formed at the tip of the boss 312. Since the weld formed at the tip of the boss 312 is a joining point of the resin, cracks are likely to occur starting from the weld. In other words, a crack such as a crack may occur from the weld formed at the tip of the boss 312 due to the stress when the screw member 50 is fastened to the fixing hole 313 of the boss 312. In the present embodiment, as will be described in detail later, a clearance portion that is a gap is provided between the opening edge of the fixing hole 313 of the boss 312 and the screw member 50, so that even if the screw member 50 is fastened to the fixing hole 313. The stress applied to the tip of the boss 312 can be reduced to suppress cracks from the weld.

  The flow path member 320 is made of a resin material that is held in the holding portion 311 of the case member 310 and provided with a liquid supply path 321 through which ink passes. The flow path member 320 is provided with a through hole 322 through which the boss 312 can be inserted in a region corresponding to the boss 312 of the case member 310. Here, the boss 312 provided in the case member 310 is longer than the through-hole 322 and has a length such that the tip of the boss 312 protrudes from the through-hole 322 when the boss 312 is inserted into the flow path member 320.

  The liquid supply path 321 of the flow path member 320 has one end communicating with the connection flow path provided in the fixed portion 41 at the tip of the tube 40, and the other end connected to the head body 10 on the bottom surface side of the case member 310. Communicate.

  The lid member 330 is formed of a plate-like member made of a resin material or the like that seals one surface where the holding portion 311 of the case member 310 opens. The lid member 330 is fixed to the case member 310 in a state where the seal member 340 is sandwiched between the lid member 330 and the case member 310, as will be described in detail later.

  Such a lid member 330 is provided with a connecting portion 331 penetrating in the thickness direction opening at a position opposite to the liquid supply path 321 of the flow path member 320. The connecting portion 331 is provided with an opening area slightly smaller than the fixing portion 41 fixed to the tip of the tube 40, and the fixing portion 41 is fitted therein. Further, the lid member 330 is provided with two first insertion holes 332 that penetrate in the thickness direction in a region facing the fixing hole 313 of the boss 312. The first insertion hole 332 has a larger inner diameter than the fixing hole 313 of the boss 312 and an inner diameter large enough to prevent the screw member 50 from being screwed together.

  The seal member 340 sandwiched between the lid member 330 and the case member 310 is formed of a rubber material such as silicon rubber, chloroprene rubber, butyl rubber, ethylene propylene rubber, or nitrile rubber, or an elastic material such as an elastomer material. It consists of a plate-shaped member.

  The seal member 340 is formed to have a size that covers the surface of the case member 310 where the holding portion 311 opens. Further, the seal member 340 is provided with a second insertion hole 341 that communicates with the first insertion hole 332 of the lid member 330 in the thickness direction. The second insertion hole 341 has substantially the same inner diameter as the first insertion hole 332 so that it is not screwed into the screw member 50.

  The seal member 340 is provided with a communication passage 342 penetrating in the thickness direction that communicates the liquid supply passage 321 of the flow passage member 320 and the connection flow passage 42 of the fixing portion 41 fixed to the tip of the tube 40. ing. In this embodiment, as will be described in detail later, since four connection flow paths 42 of the fixing portion 41 are provided, the seal member 340 is provided with four communication paths 342 in the same number as the connection flow paths 42. ing.

  Such a liquid supply member 30 is integrated by inserting the flow path member 320 into the holding portion 311 of the case member 310 and fixing the lid member 330 to the case member 310 via the seal member 340. Although not particularly illustrated, the case member 310 and the lid member 330 can be fixed by, for example, fastening with a screw member such as a male screw or joining with an adhesive. Incidentally, when the case member 310 and the lid member 330 are fastened with a screw member, a boss having the same structure as the boss 312 described above may be provided, or a boss may be provided on the lid member 330 side. Also good.

  As described above, the fixing portion 41 fixed to the distal end of the tube 40 is fixed to the lid member 330 side of the liquid supply member 30 in which the case member 310, the flow path member 320, the lid member 330, and the seal member 340 are integrated. Is done.

  Here, the fixing portion 41 is fixed to the tip of the tube 40 and fixes the tube 40 to the lid member 330 of the liquid supply member 30. The fixing portion 41 of the present embodiment is configured such that one end in the longitudinal direction of a plate member having a rectangular shape is bent in an L shape, and the tips of the four tubes are fixed to the bent portions. In the present embodiment, the four tubes 40 connected to the fixed portion 41 supply different color inks, that is, four color inks. Examples of the four color inks supplied to the fixing unit 41 include black (B), yellow (Y), cyan (C), and magenta (M). Of course, the number of tubes connected to the fixing portion 41 is not limited to this, and only one tube 40 may be connected to the fixing portion 41, and a plurality of tubes such as two or more or four or more may be used. The tube 40 may be connected. The number of tubes 40 and the number of ink types do not have to be the same, and the same type of ink may be supplied by a plurality of tubes 40.

  Such a fixing portion 41 is provided with a connection flow path 42 for supplying ink from each tube 40 to the flow path member 320 individually. Although not particularly illustrated, the connection channel 42 is continuously provided so as to open from the bent region on the one end side in the longitudinal direction to which the tube 40 is fixed to the bottom surface of the fixing portion 41.

  The fixing portion 41 is disposed so that the bent portion is along the side surface of the lid member 330, and the fixing portion 41 is fitted into the connection portion 331 of the lid member 330. As a result, the connection flow path 42 of the fixed portion 41 and the liquid supply path 321 of the flow path member 320 communicate with each other via the communication path 342 of the seal member 340, and ink from the tube 40 is connected to the connection flow path 42 and the communication path. It is supplied to the liquid supply path 321 of the flow path member 320 through 342.

  Further, the fixing portion 41 is provided with a groove portion 43 at an end portion and a central portion opposite to the end portion to which the tube 40 in the longitudinal direction is fixed, and each groove portion 43 penetrates in the thickness direction. A third insertion hole 44 is provided. The third insertion hole 44 is provided in communication with the fixing hole 313 of the boss 312 via the first insertion hole 332 of the lid member 330 and the second insertion hole 341 of the seal member 340. The third insertion hole 44 is formed with the same inner diameter as the first insertion hole 332 of the lid member 330.

  Then, the screw member 50 formed of two male screws is inserted into the fixing hole 313 of the boss 312 of the case member 310 in a state where the screw member 50 is inserted through the third insertion hole 44, the first insertion hole 332, and the second insertion hole 341 of the fixing portion 41. The fixing portion 41 is fastened to the liquid supply member 30 by screwing. That is, in the present embodiment, the lid member 330 and the seal member 340 are provided as sandwiching members that are sandwiched when the fixing portion 41 is fixed to the boss 312.

  Here, as shown in FIG. 4, the screw member 50 includes a head portion 51 and a shaft portion 52 having an outer diameter smaller than that of the head portion 51. Further, the shaft portion 52 includes a first screwing portion 53 having a spiral thread formed on the outer periphery continuously from the head portion 51, and a first screwing portion 53 continuous to the first screwing portion 53. A concave portion 54 having a smaller outer diameter, and a second threaded portion 55 having a helical thread formed on the outer periphery continuously to the concave portion 54. That is, the recessed part 54 in which the screw thread is not formed is provided between the first screw part 53 and the second screw part 55 provided with the screw thread.

  The first screwing portion 53 and the second screwing portion 55 basically have an outer diameter slightly larger than the inner diameter of the fixing hole 313 of the boss 312. The tip of the second screwing portion 55 is tapered so as to have an outer diameter smaller than that of the fixing hole 313 in order to facilitate insertion into the target hole (the fixing hole 313 in this embodiment). Is provided.

  On the other hand, the fixing hole 313 of the boss 312 to which the screw member 50 is screwed is not provided with a female screw in the initial state. Then, by inserting the second screwing portion 55 of the screw member 50 into the fixing hole 313 while being rotated, a screw groove is formed on the inner surface of the fixing hole 313 by the second screwing portion 55, so that the fixing is a female screw. Hole 313 is formed. That is, the screw member 50 of the present embodiment is a so-called tapping screw that does not require a female screw and is screwed while cutting a screw groove.

  Such a screw member 50 is inserted from the third insertion hole 44 side of the fixing portion 41 in a state where the fixing portion 41 is fitted to the connection portion 331, and the first insertion hole 332 and the seal member 340 of the lid member 330 are inserted. The fixing portion 41 is fixed to the liquid supply member 30 by passing through the second insertion hole 341 and screwing into the fixing hole 313 of the boss 312. At this time, the recess 54 provided in the screw member 50 is provided at a position facing the opening edge of the fixing hole 313. That is, the first threaded portion 53 of the screw member 50 is provided with a length that passes through the third insertion hole 44 and the first insertion hole 332 and reaches the middle of the second insertion hole 341. The concave portion 54 of the screw member 50 is provided at a position and a length that straddle the boundary between the second insertion hole 341 and the fixing hole 313.

  Therefore, only the second screwing portion 55 of the screw member 50 is screwed into the fixing hole 313, and the second screwing portion 55 is on the bottom surface side (the head main body 10 side) with respect to the opening edge of the fixing hole 313. To be screwed into the fixing hole 313. As a result, an escape portion 60 that is a gap formed by the recess 54 is formed between the screw member 50 and the opening edge of the fixing hole 313.

  Thus, when the screw member 50 that fixes the fixing portion 41 to the liquid supply member 30 and the fixing hole 313 are screwed together, the escape portion 60 is formed between the opening edge of the fixing hole 313 and the screw member 50. Thus, the stress applied to the opening edge of the fixing hole 313 when the screw member 50 is fastened to the fixing hole 313 can be reduced. For this reason, the occurrence of cracks due to the concentration of stress at the tip end where the fixing hole 313 of the boss 312 opens is suppressed, and leakage of ink between the fixing portion 41 and the liquid supply member 30 is suppressed. Can do. Further, since it is not necessary to form the boss 312 thick, an increase in the size of the liquid supply member 30 can be suppressed. Furthermore, even if a weld is formed at the tip of the boss 312, since the crack at the tip of the boss 312 can be suppressed by the escape portion 60, the liquid supply member 30 can be formed by inexpensive molding. The ink jet recording head 1 is removed from the ink jet recording apparatus during maintenance such as replacement or repair. As described above, each time the ink jet recording head 1 is attached / detached, the tube 40 provided with the fixing portion 41 is detached from the ink jet recording head 1 (liquid supply member 30). Sometimes, the destruction of the boss 312 can be suppressed, and ink leakage due to insufficient fastening can be suppressed. For this reason, it is possible to easily perform maintenance such as repair and replacement of the ink jet recording head 1 while suppressing breakage of the boss 312. Incidentally, although it is conceivable to replace the liquid supply member 30 every time the ink jet recording head 1 is attached / detached, there is a problem that the cost becomes high and it is complicated. In the present embodiment, since it is not necessary to replace the liquid supply member 30 every time the ink jet recording head 1 is attached / detached, there is an effect that the cost can be reduced.

  In the present embodiment, the first screwing portion 53 is provided on the head 51 side as the screw member 50. The first screwing portion 53 is for reducing the distance between the first insertion hole 332, the second insertion hole 341, and the third insertion hole 44. That is, when the concave portion 54 is extended to the head 51 without providing the first screwing portion 53 on the head 51 side of the screw member 50, the first insertion hole 332, the second insertion hole 341, and the third insertion hole 44 And the backlash of the fixing portion 41, the lid member 330, and the seal member 340 with respect to the screw member 50 is increased. In the present embodiment, by providing the first screwing portion 53 in the screw member 50, the distance between the first insertion hole 332, the second insertion hole 341, and the third insertion hole 44 is reduced, and the fixing portion 41, the lid The backlash of the member 330 and the seal member 340 with respect to the screw member 50 can be reduced. That is, in this embodiment, the 1st screwing part 53 is provided as a rattle prevention part.

  Here, an example of the head main body 10 fixed to the liquid supply member 30 will be described. FIG. 5 is a cross-sectional view of the head body according to the first embodiment of the invention.

  The head main body 10 shown in FIG. 5 is a type having a longitudinal vibration type piezoelectric element, and a plurality of pressure generating chambers 12 are arranged in parallel on the flow path substrate 11, and each pressure generation is performed on both sides of the flow path substrate 11. Sealed by a nozzle plate 14 having a nozzle opening 13 corresponding to the chamber 12 and a diaphragm 15. In addition, the flow path substrate 11 is formed with a manifold 17 that communicates with each pressure generation chamber 12 via an ink supply port 16 and serves as a common ink chamber for the plurality of pressure generation chambers 12. Is connected to an ink cartridge (not shown).

  On the other hand, on the side opposite to the pressure generation chamber 12 of the diaphragm 15, the tip of the piezoelectric actuator 18 is provided in contact with a region corresponding to each pressure generation chamber 12. These piezoelectric actuators 18 are laminated by sandwiching piezoelectric materials 19 and electrode forming materials 20 and 21 alternately in the vertical direction, and an inactive region that does not contribute to vibration is fixed to the fixed substrate 22.

  In the head main body 10 configured as described above, ink is supplied to the manifold 17 via the flow path 24 communicating with the liquid supply path 321 of the liquid supply member 30 described above, and each pressure is generated via the ink supply port 16. Distributed to chamber 12. Then, the piezoelectric actuator 18 is contracted by applying a voltage to the piezoelectric actuator 18. Accordingly, the diaphragm 15 is deformed together with the piezoelectric actuator 18 (upwardly in the drawing), the volume of the pressure generating chamber 12 is expanded, and ink is drawn into the pressure generating chamber 12. Then, after filling the inside to the nozzle opening 13 with ink and then releasing the voltage applied to the electrode forming materials 20 and 21 of the piezoelectric actuator 18 according to the recording signal from the drive circuit, the piezoelectric actuator 18 is expanded. To return to the original state. As a result, the vibration plate 15 is also displaced to return to the original state, so that the pressure generating chamber 12 is contracted, the internal pressure is increased, and an ink droplet is ejected from the nozzle opening 13. That is, in the present embodiment, a longitudinal vibration type piezoelectric actuator 18 is provided as a pressure generating means for causing a pressure change in the pressure generating chamber 12.

(Embodiment 2)
FIG. 6 is an enlarged cross-sectional view of a main part of an ink jet recording head which is an example of a liquid jet head according to Embodiment 2 of the present 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.

  As shown in FIG. 6, the screw member 50A of the present embodiment includes a head 51 and a shaft portion 51A, and a screw thread is provided on the outer periphery of the shaft portion 51A. That is, the recess 54 is not provided in the screw member 50A of the present embodiment.

  The fixing hole 313A of the boss 312 of the case member 310 into which the screw member 50A is screwed has a small diameter portion 314 that is an area in which the shaft portion 51A of the screw member 50A is screwed and an inner diameter larger than the small diameter portion 314. A large-diameter portion 315 provided at the opening edge of the fixing hole 313A. When the screw member 50A is screwed into the fixing hole 313A, the screw member 50A is screwed only to the small diameter portion 314 without being screwed to the large diameter portion 315. That is, at the opening edge portion of the fixing hole 313A, the large diameter portion 315 forms a clearance portion 60A that is a gap between the screw member 50A and the fixing hole 313A.

  As described above, by providing the relief portion 60A between the screw member 50A and the fixing hole 313A at the opening edge portion of the fixing hole 313A, the fixing provided at the distal end of the tube 40 as in the first embodiment described above. When the screw member 50A is fastened to the fixing hole 313A in order to fix the portion 41 to the liquid supply member 30, the stress applied to the tip of the boss 312 is reduced to suppress breakage of the boss 312 such as cracks. be able to. Of course, also in the present embodiment, the same screw member 50 as in the first embodiment may be used. That is, the escape portion may be formed by the concave portion 54 provided in the screw member 50 and the large diameter portion 315 provided in the fixing hole 313A. In this way, by forming the relief portion by the concave portion 54 and the large diameter portion 315, the relief portion having a sufficient interval can be defined by the relatively shallow concave portion and the large diameter portion 315 having a relatively small inner diameter.

(Other embodiments)
As mentioned above, although each embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above. For example, in each of the above-described embodiments, the ink jet recording head 1 including the head main body 10 and the liquid supply member 30 is illustrated. However, for example, a member corresponding to the liquid supply member 30 is provided in the middle of the tube 40. Also good. That is, if everything from the storage means to the head main body 10 is defined as the ink jet recording head 1, the liquid supply member 30 may be provided anywhere from the storage means to the head main body 10. Of course, the liquid supply member 30 may be integrally provided in a part of the head body 10.

  Further, in each of the above-described embodiments, the liquid supply member 30 provided with the liquid supply path 321 has been exemplified. However, for example, a filter, a valve mechanism, a heating unit, and the like are provided inside the liquid supply member 30. May be.

  Further, in each of the above-described embodiments, the longitudinal vibration type piezoelectric actuator 18 has been described as the pressure generating means for causing a pressure change in the pressure generating chamber 12, but the present invention is not particularly limited thereto. For example, the lower electrode, A thin film type piezoelectric actuator in which a piezoelectric layer and an upper electrode are formed and formed by lithography and a thick film type piezoelectric actuator formed by a method such as attaching a green sheet can be used. Further, as a pressure generating means, a heat generating element is arranged in the pressure generating chamber 12 and a liquid droplet is discharged from the nozzle opening by a bubble generated by heat generation of the heat generating element, or static electricity is generated between the diaphragm and the electrode. It is possible to use a so-called electrostatic actuator that is generated and deforms the diaphragm by electrostatic force to discharge droplets from the nozzle opening.

  The ink jet recording head 1 described above is mounted on an ink jet recording apparatus. FIG. 7 is a schematic perspective view showing an example of the ink jet recording apparatus. As shown in FIG. 7, in the ink jet recording apparatus I of this embodiment, an ink jet recording head 1 is mounted on a carriage 2. The carriage 2 on which the ink jet recording head 1 is mounted is provided on a carriage shaft 2a attached to the apparatus body 7 so as to be movable in the axial direction.

  In addition, the apparatus main body 7 is provided with a storage unit 3 including a tank in which ink is stored. The ink from the storage unit 3 passes through the tube 40 to the ink jet recording head 1 mounted on the carriage 2. Supplied.

  Then, the driving force of the driving motor 8 is transmitted to the carriage 2 via a plurality of gears and a timing belt 8a (not shown), so that the carriage 2 on which the ink jet recording head 1 is mounted is moved along the carriage shaft 2a. . On the other hand, the apparatus body 7 is provided with a platen 9 along the carriage shaft 2a, and a recording sheet S, which is a recording medium such as paper fed by a not-shown paper feed roller, is wound around the platen 9. It is designed to be transported.

  In such an ink jet recording apparatus I, the carriage 2 is moved along the carriage shaft 2 a and ink is ejected by the head body 10 of the ink jet recording head 1 to print on the recording sheet S.

  In the ink jet recording apparatus I described above, the ink jet recording head 1 is mounted on the carriage 2 and moves in the main scanning direction. However, the present invention is not particularly limited thereto. The present invention can also be applied to a so-called line-type recording apparatus that is fixed to the apparatus body 7 and performs printing only by moving a recording sheet S such as paper in the sub-scanning direction.

  In the above-described example, the ink jet recording head 1 is described as an example of the liquid ejecting head, and the ink jet recording apparatus I is illustrated as an example of the liquid ejecting apparatus. The present invention is intended for the entire apparatus, and can of course be applied to a liquid ejecting head and a liquid ejecting apparatus that eject liquid other than ink. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejection head used for electrode formation, a bio-organic matter ejection head used for biochip production, and the like, and can also be applied to a liquid ejection apparatus provided with such a liquid ejection head.

  I Inkjet Recording Device (Liquid Ejecting Device), 1 Inkjet Recording Head (Liquid Ejecting Head), 10 Head Body, 30 Liquid Supply Member, 40 Tube, 41 Fixing Part, 50, 50A Screw Member, 54 Recess, 60, 60A Escape part, 310 case member, 312 boss, 313, 313A fixing hole, 315 large diameter part, 320 flow path member, 330 lid member, 340 seal member

Claims (5)

A tube for supplying the liquid from the storage means in which the liquid is stored;
A fixing portion for fixing the tube;
A boss provided with a fixing hole into which a screw member for fixing the fixing portion is screwed;
A screw member for fixing the fixing portion to the boss,
A liquid ejecting head, wherein a relief portion that is a gap that is not screwed into the screw member is provided between the screw member and the fixing hole in a region corresponding to an opening edge portion of the fixing hole. .   The liquid ejecting head according to claim 1, wherein the escape portion is formed by a concave portion provided in a region facing the opening edge of the fixing hole of the screw member.   The fixing portion is fixed to the boss via a pinching member, and the pinching member is provided with an insertion hole through which the screw member is inserted, and in a region opposite to the insertion hole of the screw member. The liquid ejecting head according to claim 2, wherein a backlash preventing portion having an outer diameter larger than the concave portion is provided.   The said escape part is formed in the opening edge part of the said fixing hole, and is formed of the large diameter part with a larger internal diameter than the area | region where the said screw member is screwed together. The liquid jet head according to one item.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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