JP2010208048A - Fluid jetting apparatus and valve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid jetting apparatus and a valve unit which can improve the maintainability. <P>SOLUTION: The fluid jetting apparatus includes a fluid jetting head with nozzles for jetting a fluid, and the valve unit which opens and closes a channel of the fluid connected with the fluid jetting head. The valve unit has a valve seat provided in the channel and a valve body which comes in and out of contact with the valve seat. The valve unit is formed to open and close the channel by separation and contact between the valve seat and the valve body. The valve seat has a liquid repelling part at a contact part to the valve body. A contact part to the valve seat of the valve body is formed by using an elastic body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluid ejecting apparatus and a valve unit.

  As a fluid ejecting apparatus that ejects fluid, for example, an ink jet printer apparatus (hereinafter referred to as “printer apparatus”) is known. The printer device is a device that records characters, images, and the like on a recording medium. The printer device is configured such that ink is ejected onto a recording medium from nozzles provided in the recording head. The recording head is mounted on a moving mechanism such as a carriage, and is configured to eject ink while moving on the recording medium.

  A printer device of a type called an off-carriage type is configured such that an ink cartridge is disposed on the case side of the device, and ink is supplied from the ink cartridge to a recording head via a supply tube. The printer apparatus has an ink supply valve unit having a self-sealing function on the carriage side (see, for example, Patent Document 1).

  The ink supply valve unit includes an ink supply chamber and a pressure chamber. The ink supplied from the ink cartridge is supplied from the ink supply chamber to the recording head via the pressure chamber. A movable valve is provided between the ink supply chamber and the pressure chamber, and the ink supply chamber and the pressure chamber are connected or disconnected by opening and closing the movable valve. The ink supply valve unit operates the movable valve by directly transferring the displacement to the movable valve by displacing the film member constituting a part of the pressure chamber by decreasing the amount of ink inside the pressure chamber. It is configured as follows.

  When ink is consumed by the recording head, the amount of ink in the pressure chamber decreases and the pressure in the pressure chamber decreases. When the pressure in the pressure chamber decreases, the movable valve is opened, and ink is supplied from the ink supply chamber to the pressure chamber. Ink corresponding to the amount of ink consumed by the recording head is supplied to the pressure chamber. For this reason, the pressure upstream of the ink supply valve unit does not affect the recording head side.

JP 2004-142405 A

  However, there are cases where ink accumulates on the seal portion and grows due to the opening / closing operation of the movable valve. When ink accumulates on the seal portion of the movable valve, the movable valve is not closed by the ink, and a leak occurs. When the leak occurs, the pressure on the upstream side of the ink supply valve unit is applied to the head, which may cause a problem such as ink dripping from the nozzle. In that case, ink adheres to the inside of the apparatus, and the maintainability deteriorates. Further, ink is dripped on the print medium during printing, and the medium is wasted.

  In view of the circumstances as described above, it is an object of the present invention to provide a fluid ejecting apparatus and a valve unit that can improve maintainability and do not waste a printing medium.

  A fluid ejecting apparatus according to the present invention includes a liquid ejecting head having a nozzle for ejecting a liquid, and a valve unit that opens and closes a flow path of the liquid connected to the liquid ejecting head. A valve seat provided in a path and a valve body that comes in contact with and separates from the valve seat, and is configured to open and close the flow path by the contact between the valve seat and the valve body, The contact portion with the valve body has a liquid repellent portion having liquid repellency with respect to the liquid, and the valve body has a contact portion with the valve seat formed using an elastic body. Features.

  According to the present invention, since the valve seat has the liquid repellent portion at the contact portion with the valve body, the liquid is repelled in the liquid repellent portion. For this reason, it is difficult for the liquid to flow through the contact portion between the valve seat and the valve body. Thereby, it is possible to suppress the liquid from being deposited on the contact portion between the valve seat and the valve body, and it is possible to prevent the occurrence of leakage, thereby improving the maintainability. Further, it is possible to eliminate the waste of soiling the print medium.

In the fluid ejecting apparatus, the liquid repellent portion is provided so as to surround the flow path.
According to the present invention, since the liquid repellent part is provided so as to surround the flow path, the entire area surrounding the flow path is protected from the occurrence of leakage.

The fluid ejecting apparatus is characterized in that the valve seat has a flow suppressing portion in a region outside the liquid repellent portion with respect to the flow path.
According to the present invention, since the flow restricting portion is formed in the region outside the liquid repellent portion of the valve seat, when forming the liquid repellent portion on the valve seat, liquid is used as the material constituting the liquid repellent portion. Even if it is used, the formation region of the liquid repellent part can be reliably partitioned.

The fluid ejecting apparatus is characterized in that the flow suppressing part is formed in an annular shape around the liquid repellent part.
According to the present invention, since the flow suppressing portion is formed in an annular shape around the liquid repellent portion, the annular region can be reliably partitioned.

The fluid ejecting apparatus is characterized in that the flow restricting portion is formed in a groove shape.
According to the present invention, since the flow restricting portion is formed in a groove shape, it is possible to capture the liquid used when forming the liquid repellent portion. Thereby, the formation area of the liquid repellent part can be partitioned reliably.

The fluid ejecting apparatus is characterized in that the flow suppressing part is formed in a protruding shape.
According to the present invention, since the flow restricting portion is formed in a protruding shape, the liquid used when forming the liquid repellent portion can be blocked. Thereby, the formation area of the liquid repellent part can be partitioned reliably.

  A valve unit according to the present invention is a valve unit that opens and closes a flow path of the fluid connected to a fluid ejecting head having a nozzle that ejects fluid, and includes a valve seat provided in the flow path, and a valve seat A valve body that contacts and separates, and is configured to open and close the flow path by separating and contacting the valve seat and the valve body, and the valve seat is formed at a contact portion with the valve body. And a liquid repellent portion having liquid repellency with respect to the liquid, wherein the valve body is formed by using an elastic body at a contact portion with the valve seat.

  According to the present invention, since the valve seat has the liquid repellent portion at the contact portion with the valve body, the liquid is repelled in the liquid repellent portion. For this reason, it is difficult for the liquid to flow through the contact portion between the valve seat and the valve body. Thereby, it can suppress that a liquid accumulates in the contact part of a valve seat and a valve body, and can prevent generation | occurrence | production of a leak.

1 is a diagram illustrating an overall configuration of a printer apparatus according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration in the vicinity of a recording head of the printer device according to the embodiment. FIG. 3 is a cross-sectional view illustrating a configuration of a recording head. Sectional drawing which shows the structure of a subtank. The top view which shows the structure of a part of sub tank. FIG. 6 is an operation diagram illustrating an operation of the printer apparatus. Same operation diagram. Same operation diagram. Sectional drawing which shows the other structure of a subtank.

Hereinafter, an embodiment of a fluid ejecting apparatus according to the invention will be described with reference to the drawings. In each of the following drawings, the scale of each member is appropriately changed to make each member a recognizable size.
FIG. 1 is a partially exploded view showing a schematic configuration of a printer apparatus PRT according to the present embodiment.
The printer device PRT has a printer body 5 and a carriage 4 on which the sub tank 2 and the recording head 3 are mounted.

  The printer body 5 includes a carriage moving mechanism 54 that reciprocates the carriage 4, a capping device 50 that is used for a cleaning operation for sucking the ink L thickened from each nozzle of the recording head 3, and the ink supply tube 34. An ink cartridge (fluid supply member) 6 that stores ink L to be supplied to the recording head 3 is provided. The printer main body 5 is provided with a paper feed mechanism (not shown) for transporting recording paper. The paper feed mechanism is a paper feed motor or a paper feed roller (not shown) that is rotationally driven by the paper feed motor. The recording paper is sequentially fed onto the platen 13 in conjunction with a recording (printing / printing) operation.

  The carriage moving mechanism 54 includes a guide shaft 8 installed in the width direction of the printer body 5, a pulse motor 9, a drive pulley 10 that is connected to a rotation shaft of the pulse motor 9 and is driven to rotate by the pulse motor 9, A driving pulley 10 includes an idler pulley 11 provided on the opposite side of the printer body 5 in the width direction, and a timing belt 12 that is stretched between the drive pulley 10 and the idler pulley 11 and connected to the carriage 4. The carriage 4 is reciprocated in the main scanning direction along the guide shaft 8 by driving the pulse motor 9.

  The capping device 50 is disposed at a home position in the printer body 5. This home position is an end area outside the recording area within the movement range of the carriage 4. When the power is turned off or when recording (liquid ejection processing) is not performed for a long time, the carriage 4 The location is set.

FIG. 2 is a cross-sectional view illustrating the configuration of the recording head 3, and FIG.
The recording head 3 includes an introduction needle unit 17, a head case 18, a flow path unit 19, and an actuator unit 20 as main components.

  Two ink introduction needles 22 are mounted side by side on the upper surface of the introduction needle unit 17 with the filter 21 interposed. The sub tanks 2 are respectively attached to these ink introduction needles 22. An ink introduction path 23 corresponding to each ink introduction needle 22 is formed inside the introduction needle unit 17.

The upper end of the ink introduction path 23 communicates with the ink introduction needle 22 via the filter 21, and the lower end communicates with the case flow path 25 formed inside the head case 18 via the packing 24.
In the present embodiment, since two types of ink are used, two sub tanks 2 are arranged. However, a configuration using three or more types of ink may be used.

The outer portion of the sub tank 2 is molded from a resin material such as polypropylene.
FIG. 4 is a cross-sectional view showing the configuration of the sub tank 2. As shown in FIG. 4, the sub tank 2 includes an ink supply chamber 27A, a pressure chamber 27B, a valve unit VL, and an elastic sheet 26 made of a flexible film member. The ink supply chamber 27 </ b> A is connected to the supply tube 34 and is a portion to which the ink that has flowed through the supply tube 34 is supplied. A partition wall A is formed between the ink supply chamber 27A and the pressure chamber 27B so as to partition the chambers 27A and 27B. The partition wall A communicates the ink supply chamber 27A and the pressure chamber 27B. A communication path 60 is formed, and one end of the communication path 60 opens to the ink supply chamber 27A, and the other end opens to the pressure chamber 27B. The pressure chamber 27B communicates with the ink supply chamber 27A via the communication path 60. The pressure chamber 27B has an opening 61 communicating with the outside.

  The elastic sheet 26 is attached so as to close the opening 61. The elastic sheet 26 expands and contracts according to the pressure in the pressure chamber 27B. For example, when the pressure in the pressure chamber 27B becomes higher than the external pressure, the expanded state 26a (see FIG. 2) is obtained. When the pressure in the pressure chamber 27B becomes lower than the external pressure, the contracted state 26b (see FIG. 2) is entered.

  The valve unit VL is a valve that opens and closes the communication path 60. The valve unit VL has a valve seat 70 and a valve body 71. The valve seat 70 is configured by a side wall of the communication path 60. A liquid repellent portion 80 is formed in the valve seat 70 so as to surround the communication passage 60. Specifically, the valve body 71 opens and closes by opening and closing the valve body 71 against the valve seat 70 on the outer periphery of the opening of the communication path 60 opened in the partition wall A of the ink supply chamber 27A. A liquid repellent portion 80 is formed on the contact surface of the seat 70 with the valve body 71 so as to surround the outer periphery of the opening of the communication path 60. The liquid repellent part 80 is formed in a film shape by a material having hydrophobicity with respect to ink such as a silane coupling agent. The liquid repellent part 80 is formed by a wet film forming method such as a spin coating method or a coating method using a dispenser. FIG. 5 is a plan view showing the configuration of the valve seat 70. As shown in the figure, the liquid repellent portion 80 is formed in an annular shape with a constant width (diameter dimension) in plan view. In the valve seat 70, a groove-like flow restricting portion 81 is formed in a region outside the liquid repellent portion 80 with respect to the communication passage 60. The flow suppressing unit 81 is formed in an annular shape around the liquid repellent unit 80. The flow restricting portion 81 restricts the flow of the liquid repellent portion material so that the liquid repellent portion material does not overflow outside the valve seat 70 when the liquid repellent portion 80 is formed.

  The valve body 71 has a closing portion 72 and a shaft portion 73. The blocking portion 72 is a portion that blocks the communication path 60. As shown in FIG. 5, the blocking portion 72 is formed to have a diameter larger than the diameter in the cross-sectional shape of the communication path 60. In the closing portion 72, a contact surface (contact portion) 72a with the valve seat 70 is formed by using an elastomer material such as rubber. The closing part 72 is fixed to the sub tank main body 2a by a spring mechanism (not shown).

  The shaft portion 73 is a portion formed integrally with the closing portion 72 and inserted into the communication path 60. The shaft portion 73 is formed in a columnar shape so as to have a diameter smaller than the diameter of the communication path 60. An end portion 73 a of the shaft portion 73 is connected to the central portion of the elastic sheet 26 via a plate-like member 74. The plate-like member 74 is fixed to the sub tank main body 2a by a spring mechanism (not shown). The shaft portion 73, the plate-like member 74, and the elastic sheet 26 are integrally formed. For this reason, when the elastic sheet 26 expands or contracts, the shaft portion 73 moves in the expansion / contraction direction of the elastic sheet 26.

  Returning to FIGS. 1 to 3, a needle connecting portion 28 into which the ink introduction needle 22 is inserted projects downward from the lower portion of the sub tank 2. The pressure chamber 27B in the sub tank 2 has a bowl shape in a cross-sectional view.

  An opening on the upstream side of the connection flow path 29 communicating with the needle connection portion 28 is disposed at a position slightly below the central portion in the vertical direction on the side surface of the pressure chamber 27B. A seal member 31 into which the ink introduction needle 22 is liquid-tightly fitted is fitted in the internal space of the needle connection portion 28. A tank filter 30 for filtering the ink L flowing into the ink supply chamber 27A is attached to the inlet side (ink supply tube 34 side) of the ink supply chamber 27A.

  The elastic sheet 26 can be deformed in both the direction of contracting the pressure chamber 27B and the direction of expanding the pressure chamber 27B. The deformation of the elastic sheet 26 absorbs the pressure fluctuation of the ink L, and the ink L is supplied to the recording head 3 side in the state where the pressure fluctuation is absorbed in the sub tank 2. Thus, the sub tank 2 functions as a pressure damper.

  The head case 18 is a hollow box-shaped member made of synthetic resin. A flow path unit 19 is joined to the lower end surface of the head case 18, and the actuator unit 20 is accommodated in an accommodation empty portion 37 formed inside, and a packing is formed on the upper end surface opposite to the flow path unit 19 side. An introduction needle unit 17 is attached with 24 interposed. A case channel 25 is provided inside the head case 18 so as to penetrate the height direction. The upper end of the case flow path 25 communicates with the ink introduction path 23 of the introduction needle unit 17 via the packing 24.

  The lower end of the case flow path 25 communicates with the common ink chamber 44 in the flow path unit 19, and the ink L introduced from the ink introduction needle 22 passes through the ink introduction path 23 and the case flow path 25 to the common ink chamber 44 side. To be supplied.

  The actuator unit 20 housed in the housing space 37 of the head case 18 includes a plurality of piezoelectric vibrators 38 arranged in a comb shape, a fixing plate 39 to which the piezoelectric vibrators 38 are joined, and the printer main body side. And a flexible cable 40 as a wiring member for supplying a drive signal from the piezoelectric vibrator 38 to the piezoelectric vibrator 38. Each piezoelectric vibrator 38 has a fixed end portion bonded to a fixed plate 39 and a free end portion protruding outward from the front end surface of the fixed plate 39, and is attached to the fixed plate 39 in a so-called cantilever state. Yes.

  The fixed plate 39 that supports each piezoelectric vibrator 38 is made of, for example, stainless steel having a thickness of about 1 mm. The actuator unit 20 is housed and fixed in the housing space 37 by bonding the back surface of the fixing plate 39 to the inner wall surface of the case that defines the housing space 37.

  The flow path unit 19 includes a vibration plate (sealing plate) 41, a flow path substrate 42, and a nozzle substrate 43. The diaphragm 41, the flow path substrate 42, and the nozzle substrate 43 are stacked, and are joined and integrated with an adhesive (not shown). The vibration plate 41, the flow path substrate 42, and the nozzle substrate 43 are members that form a series of ink flow paths (liquid flow paths) from the common ink chamber 44 to the nozzle 47 through the ink supply port 45 and the pressure chamber 46. is there. The pressure chamber 46 is formed as an elongated chamber in a direction perpendicular to the direction in which the nozzles 47 are arranged (nozzle row direction). The common ink chamber 44 communicates with the case flow path 25 and is a chamber into which ink L is introduced from the ink introduction needle 22 side. The ink L introduced into the common ink chamber 44 is distributed and supplied to each pressure chamber 46 through the ink supply port 45.

  The nozzle substrate 43 disposed at the bottom of the flow path unit 19 is a thin metal plate material in which a plurality of nozzles 47 are opened in a row at a pitch (for example, 180 dpi) corresponding to the dot formation density. The nozzle substrate 43 of the present embodiment is made of a stainless steel plate material, and for example, a total of two rows of nozzles 47 (that is, nozzle rows) are provided corresponding to each sub tank 2. One nozzle row is composed of, for example, 180 nozzles 47. The surface of the nozzle substrate 43 on which the nozzles 47 are arranged forms the ejection surface 43a.

  A flow path substrate 42 disposed between the nozzle substrate 43 and the vibration plate 41 is a flow path portion that becomes an ink flow path, specifically, a common ink chamber 44, an ink supply port 45, and an empty space that becomes a pressure chamber 46. It is a plate-like member in which a section is formed.

  The flow path substrate 42 is produced, for example, by subjecting a silicon wafer, which is a crystalline base material, to anisotropic etching. The vibration plate 41 is a double-structured composite plate material in which an elastic film is laminated on a metal support plate such as stainless steel. An island portion 48 to which the tip surface of the piezoelectric vibrator 38 is joined is formed in a portion corresponding to the pressure chamber 46 of the vibration plate 41 by removing the support plate in an annular shape by etching or the like. This island part 48 functions as a diaphragm part. The vibration plate 41 is configured such that the elastic film around the island portion 48 is elastically deformed in response to the operation of the piezoelectric vibrator 38, seals one opening surface of the flow path substrate 42, and the compliance portion 49. It has come to function as. As for the portion corresponding to the compliance portion 49, the support plate is removed by etching or the like as in the diaphragm portion, and only the elastic film remains.

  In the recording head 3, when a drive signal is supplied to the piezoelectric vibrator 38 through the flexible cable 40, the piezoelectric vibrator 38 expands and contracts in the longitudinal direction of the element, and accordingly, the island portion 48 approaches the pressure chamber 46. It moves in the direction or the direction away from it. The volume of the pressure chamber 46 is changed by the movement of the island portion 48, and a pressure fluctuation occurs in the ink L in the pressure chamber 46, and the ink droplet D is ejected from the nozzle 47 by this pressure fluctuation.

Next, the operation of the printer apparatus PRT described above will be described. The operation of the printer device PRT is comprehensively controlled by a control device (not shown).
When print data is transmitted from the outside to the printer device PRT, the control device develops the ejection data corresponding to the dot pattern and transmits it to the recording head 3. In the recording head 3, based on the received ejection data, a recording (printing / printing) process, that is, ink droplets onto the recording paper are ejected.

  After performing the printing process for a predetermined time, the control device causes a maintenance process to be performed in order to maintain the ejection characteristics of the nozzle 47. During the suction operation, the control device brings the cap member 61 in the capping device 50 into contact with the ejection surface 43 a of the recording head 3. By this operation, the space formed by the ejection surface 43a and the cap member 61 is sealed. Subsequently, the control device drives a suction pump connected to the capping device 50 to depressurize the space formed by the ejection surface 43a and the cap member. Thereby, ink can be sucked from the nozzle 47.

  Next, the operation of the sub tank 2 will be described. When supplying ink from the ink cartridge 6 to the recording head 3 side, the control device causes the ink L to be conveyed to the sub tank 2 side via the ink supply tube 34. The control device operates the piezoelectric vibrator 38 to eject the ink droplet D from the nozzle 47. By this operation, the ink in the pressure chamber 27B of the sub tank 2 moves from the connection channel 29 to the recording head 3 side.

  When ink in the pressure chamber 27B flows out, the pressure in the pressure chamber 27B decreases. For this reason, as shown in FIG. 6, it will be in a contracted state so that the elastic film 26 may be pulled in the pressure chamber 27B. When the elastic film 26 is contracted and moves to the inside of the pressure chamber 27B, the plate-like member 74 and the shaft portion 73 that are integrally formed with the elastic film 26 are pushed into the ink supply chamber 27A side. For this reason, the closed portion 72 is separated from the valve seat 70 (the liquid repellent portion 80), and the ink supply chamber 27A and the pressure chamber 27B are communicated with each other via the communication path 60.

  While the pressure in the pressure chamber 27B is reduced, the pressure in the ink supply chamber 27A is kept constant. Therefore, when the ink supply chamber 27A and the pressure chamber 27B communicate with each other, FIG. As shown in FIG. 2, the ink stored in the ink supply chamber 27A side by the pressure difference moves to the pressure chamber 27B side.

  When the pressure chamber 27B is filled with ink, the elastic film 26 is returned to its original state and moves away from the ink supply chamber 27A. By the movement of the elastic film 26, the plate member 74 and the shaft portion 73 are pulled away from the ink supply chamber 27A, and the closing portion 72 contacts the valve seat 70 (liquid repellent portion 80) as shown in FIG. . Therefore, the ink supply chamber 27 </ b> A and the pressure chamber 27 </ b> B are closed by the closing portion 72.

  Thus, in the sub tank 2, the valve unit VL is opened and closed according to the pressure (ink amount) in the pressure chamber 27B, and ink is supplied from the ink supply chamber 27A to the pressure chamber 27B. In the sub tank 2, the valve unit VL is closed except when the ink flows out from the pressure chamber 27 </ b> B to the recording head 3, so that the ink does not drip from the nozzles 47 of the recording head 3.

  On the other hand, as the opening / closing operation of the valve unit VL is repeated, there is a case where ink accumulates and grows at the contact portion between the valve body and the valve seat. When ink accumulates in this portion, the valve unit VL is not closed by the ink, and a leak occurs. When the leak occurs, the pressure on the upstream side of the valve unit VL is applied to the recording head 3 side via the ink supply chamber 27A, the communication path 60, and the pressure chamber 27B, and thus the ink drips from the nozzle 47. In this case, ink adheres to the inside of the printer apparatus 1 and the maintainability deteriorates. Further, ink is dripped on the print medium during printing, and the medium is wasted.

  On the other hand, according to the present embodiment, since the valve seat 70 has the liquid repellent portion 80 at the contact portion with the valve body 71, ink is repelled in the liquid repellent portion 80. For this reason, it becomes difficult for ink to flow through the contact portion between the valve seat 70 and the valve body 71. Thereby, it is possible to suppress the ink from being deposited on the contact portion between the valve seat 70 and the valve body 71, and it is possible to prevent the occurrence of a leak, so that the maintainability can be improved.

  Further, in this embodiment, since the flow restricting portion 81 is formed in the region outside the liquid repellent portion 80 in the valve seat 70, the liquid repellent portion is attached when the liquid repellent portion 80 is formed on the valve seat 70. Even when a liquid is used as a constituent material, the liquid repellent portion material can be prevented from protruding from a predetermined formation region, and the formation region of the liquid repellent portion 80 can be reliably partitioned. it can.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
In the above-described embodiment, the configuration in which the flow restricting portion 81 is formed in a groove shape has been described as an example. However, the present invention is not limited to this, and for example, as shown in FIG. The structure may be formed in a shape. When the flow restricting portion 81 is formed in a protruding shape, the flow restricting portion 81 is formed at a position away from the contact area of the valve body 71 so as not to prevent the contact between the valve seat 70 and the valve body 71. There is a need to.

  Moreover, in the said embodiment, the contact surface 72a of the valve seat 70 of the valve unit VL and the obstruction | occlusion part 72 of the valve body 71 demonstrated as an example the structure which opens and closes the communicating path 60 by contact of planes. However, the present invention is not limited to this, and a structure in which a convex portion is provided on the contact surface 72a so as to surround the communication path 60 may be used.

  Moreover, in the said embodiment, although demonstrated about the structure which provided the liquid-repellent part 80 in the valve seat 70 about all the subtanks 2, it was not restricted to this. For example, it is possible to provide or not provide the liquid repellent portion 80 for each type of ink. Specifically, a liquid repellent portion 80 is provided for the subtank 2 on the ink flow path formed using a material that easily deposits, for example, an aqueous magenta or cyan pigment component. The sub-tank 2 on the ink flow path formed using a difficult material can be configured such that the liquid repellent portion 80 is not provided.

  PRT ... Printer device (fluid ejecting device) VL ... Valve unit 2 ... Sub tank 3 ... Recording head (fluid ejecting head) 47 ... Nozzle 60 ... Communication path (flow path) 70 ... Valve seat 71 ... Valve body 80 ... Liquid repellent part ( (Liquid repellent part) 81 ... Distribution restriction part

Claims (7)

A liquid ejecting head having a nozzle for ejecting liquid;
A valve unit for opening and closing the flow path of the liquid connected to the liquid ejecting head,
The valve unit has a valve seat provided in the flow path and a valve body that comes into contact with and separates from the valve seat, and is configured to open and close the flow path by separating and coming into contact with the valve seat and the valve body. And
The valve seat has a liquid repellent portion having liquid repellency with respect to the liquid at a contact portion with the valve body,
In the valve body, a contact portion with the valve seat is formed using an elastic body. The fluid ejecting apparatus according to claim 1, wherein the liquid repellent portion is provided so as to surround the flow path. The fluid ejecting apparatus according to claim 1, wherein the valve seat has a flow suppressing unit in a region outside the liquid repellent unit with respect to the flow path. The fluid ejection device according to claim 3, wherein the flow suppressing unit is formed in an annular shape around the liquid repellent unit. The fluid ejection device according to claim 3 or 4, wherein the flow restriction unit is formed in a groove shape. The fluid ejection device according to claim 3 or 4, wherein the flow restriction unit is formed in a protruding shape. A valve unit for opening and closing the flow path of the fluid connected to a fluid ejecting head having a nozzle for ejecting fluid;
A valve seat provided in the flow path, and a valve body that comes into contact with and separates from the valve seat,
It is formed so as to open and close the flow path by separating and contacting the valve seat and the valve body,
The valve seat has a liquid repellent portion having liquid repellency with respect to the liquid at a contact portion with the valve body,
In the valve body, a contact portion with the valve seat is formed using an elastic body.

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