JP6650576B2 - Liquid ejection device - Google Patents

Description

  The present invention relates to a liquid ejection device that ejects a liquid by pressurizing the liquid.

  2. Description of the Related Art In various technical fields such as an electronic device manufacturing field, a liquid discharge device that discharges a liquid such as an adhesive or cream solder in a droplet state is widely used. Since many liquids to be discharged have a high viscosity, a liquid discharge apparatus that discharges this kind of liquid is known to have a configuration in which liquid stored in a storage chamber is discharged from a discharge hole by pressurizing the liquid. (For example, see Patent Document 1). In the prior art shown in this patent document example, a first member (pressing member) that is movably inserted into an opening formed in a head main body and presses the liquid by this movement, and a discharge that discharges the liquid. A configuration is adopted in which a storage chamber for storing liquid is formed by the second member (ejection nozzle) provided with the holes, and the space between the first member and the opening is sealed by a seal member. With this configuration, it is possible to prevent the air from being sucked into the storage chamber from the outside at the time of discharging the liquid, and to maintain the stable discharge of the liquid.

JP 2014-51080 A

  However, the above-described prior art has the following problems during maintenance work accompanying a change in the liquid to be discharged. That is, in the process of continuously using the liquid discharge device, the liquid to be discharged is appropriately changed according to the purpose of use. When the liquid is changed, in order to avoid mixing of different kinds of liquids, a maintenance operation of discharging the liquid remaining in the storage chamber and cleaning the storage chamber and the discharge nozzle is performed.

  However, in the prior art having the above-described configuration, due to the configuration of the head main body, the pressurizing member, and the discharge nozzle that constitute the liquid discharge device, the liquid flows into the gap between the opening provided in the head main body and the pressurizing member. However, there was a problem that it easily entered. The liquid that has entered the gap is difficult to remove by washing, and the liquid remaining in the gap hardens and causes a problem such as hindering the liquid discharge operation. As described above, the conventional liquid ejecting apparatus has a problem that the liquid easily enters the gap between the head main body and the pressurizing member, and maintenance work such as cleaning when changing the liquid is difficult.

  Therefore, an object of the present invention is to provide a liquid ejecting apparatus in which maintenance work such as cleaning when changing a liquid is easy.

  The liquid ejection device of the present invention is a liquid ejection device that ejects a liquid by pressurizing the liquid, the head ejection unit being reciprocally mounted on the head body, and one end of the head ejection unit being attached to the head body. A pressurizing member projecting in the reciprocating direction from the reciprocating direction, a concave portion which is detachably attached to the head main body, forms a storage chamber facing one end of the pressurizing member protruding from the head main body, and A discharge nozzle provided with an introduction flow path for introducing a liquid and a discharge flow path formed at the bottom of the concave portion, and the discharge flow by changing the volume of the storage chamber by reciprocating the pressurizing member. A drive unit for discharging liquid from one end of a path, between the side wall of the concave portion and the side surface of the pressure member, a packing for preventing the liquid in the storage chamber from contacting the head body. With.

  According to the present invention, it is possible to provide a liquid ejecting apparatus in which maintenance work such as cleaning when changing liquid is easy.

Configuration explanatory view of a liquid ejection device according to an embodiment of the present invention Sectional view of a discharge head of a liquid discharge apparatus according to an embodiment of the present invention. Partial sectional view of a discharge nozzle in a liquid discharge device according to an embodiment of the present invention. Exploded perspective view of a discharge nozzle in a liquid discharge device according to an embodiment of the present invention. 1 is a perspective view of a discharge nozzle in a liquid discharge apparatus according to an embodiment of the present invention. Partial sectional view of a discharge nozzle (Modification 1) in a liquid discharge device according to an embodiment of the present invention. Partial sectional view of a discharge nozzle (Modification 2) in a liquid discharge device according to an embodiment of the present invention. Exploded perspective view of a discharge nozzle (Modification 3) in a liquid discharge device according to an embodiment of the present invention. Perspective view of a discharge nozzle (Modification 3) in a liquid discharge device according to an embodiment of the present invention. Partial sectional view of a discharge nozzle (Modification 3) in a liquid discharge device according to an embodiment of the present invention.

  Next, an embodiment of the present invention will be described with reference to the drawings. First, the overall configuration of the liquid ejection apparatus 1 will be described with reference to FIG. In FIG. 1, a liquid discharge device 1 has a function of discharging a liquid by pressurizing a liquid in a storage chamber, and includes a liquid supply unit 2 for supplying a liquid to be discharged and a discharge head for discharging the supplied liquid. 3 is provided.

  The liquid supply unit 2 includes a syringe-shaped tank 4 that stores the liquid 5 and an air compressor 6 that is a pneumatic supply source. The air compressor 6 sends the air pressure adjusted to a predetermined pressure by the electropneumatic regulator to the tank 4. As a result, the liquid 5 in the tank 4 is extruded by air pressure, and is supplied to the discharge head 3 via the liquid feed pipe 7.

  The discharge head 3 has a U-shaped discharge nozzle mounting portion 9 having a bottom plate portion 9a and an open top, and a flat base portion 8 is mounted on the opening side of the discharge nozzle mounting portion 9. I have. The base section 8 and the discharge nozzle mounting section 9 constitute a head main body section 10 constituting the main body of the discharge head 3. A discharge nozzle 17 is mounted on the lower surface of the bottom plate portion 9a of the discharge nozzle mounting portion 9.

  A pressure member 11 is mounted on the discharge nozzle mounting portion 9 via an annular spring 13, and an actuator 12 made of a piezoelectric element is disposed between the pressure member 11 and the base portion 8. . The actuator 12 is controlled by the actuator control unit 14 to expand and contract in the vertical direction, and the base unit 8 supports an upward reaction force when the actuator 12 is extended. Thereby, the pressurizing member 11 disposed on the lower surface of the actuator 12 reciprocates, and the liquid 5 supplied to the storage chamber S (see FIGS. 2 and 3) via the liquid feed pipe 7 and the discharge nozzle 17. Is discharged by the configuration described below.

  Next, a detailed configuration of the ejection head 3 will be described with reference to FIGS. The discharge nozzle mounting portion 9 has a configuration in which a side plate portion 9d extends upward from both side ends of a flat bottom plate portion 9a, and a base portion 8 is fixedly mounted on an upper end portion of the side plate portion 9d. . A pressing member 11 is provided on the lower surface of the actuator 12 whose upper surface is in contact with the lower surface of the base portion 8.

  The pressing member 11 has a shape in which a cylindrical one-end portion 11b (see FIG. 4) protrudes downward from a disk-shaped large-diameter portion 11a. When the pressurizing member 11 is mounted on the discharge nozzle mounting section 9, one end 11b is fitted in a circular opening 9c provided in the bottom plate 9a of the discharge nozzle mounting section 9 so as to be able to reciprocate. In this state, the opening 9c and the side surface 11d of the one end 11b are sealed by the second packing 19B attached to the packing groove on the outer peripheral surface of the one end 11b. That is, the pressing member 11 is mounted on the head main body 10 so as to be reciprocally driven by the actuator 12, and has one end 11 b protruding from the head main body 10 in the reciprocating direction of the actuator 12. An annular spring 13 is interposed between the upper surface of the bottom plate 9a and the lower surface of the large-diameter portion 11a.

  A discharge nozzle 17 is detachably mounted on a mounting surface 9b of the discharge nozzle mounting portion 9 via a gasket 20 (see also FIG. 4). The discharge nozzle 17 is a rectangular member having an upper surface 17a mounted on the mounting surface 9b, a lower surface 17b where the discharge port 24 is opened, and a side surface 17c on which the joint 22 is planted. The upper surface 17a is provided with a concave portion 17d serving as a storage chamber S into which one end portion 11b of the pressing member 11 protruding from the discharge nozzle mounting portion 9 of the head main body portion 10 enters. That is, the recess 17d forms the storage chamber S facing the one end 11b of the pressing member 11.

  The provision of the gasket 20 prevents the cleaning liquid or the liquid 5 scattered and attached from entering between the head body 10 and the discharge nozzle 17 and entering the gap between the one end 11b of the pressure member 11 and the bottom plate 9a. can do. When the upper surface 17a of the upper surface 17a is formed with a film having a gasket function, the gasket 20 does not need to be specially provided.

  As shown in FIG. 3, the concave portion 17 d has a side wall 17 e, which is an inner peripheral surface having the same diameter or a slightly smaller diameter as the opening 9 c provided in the discharge nozzle mounting portion 9, and one end 11 b of the pressing member 11. A bottom surface 17f that forms the storage chamber S is opposed to the end surface 11c. A holding portion 17g for holding the first packing 19A is formed on the upper portion of the concave portion 17d. By holding the first packing 19A by the holding portion 17g, the first packing 19A is located between the side wall 17e of the concave portion 17d and the side surface 11d of the one end 11b of the pressing member 11. This prevents the liquid 5 in the storage chamber S from entering the gap between the side surface of the opening 9c and the side surface of the one end 11b.

  That is, in the present embodiment, the first packing 19A for preventing the liquid 5 from coming into contact with the ejection nozzle mounting portion 9 constituting the head main body 10 is provided. As described above, by providing the holding portion 17g for holding the first packing 19A on the upper portion of the concave portion 17d, the processing for forming the holding portion 17g is facilitated, and the liquid 5 that has entered the holding portion 17g is formed. And other foreign substances can be easily cleaned.

  2, a joint 22 connected to the liquid feed pipe 7 shown in FIG. 1 is provided on one side surface 17c of the discharge nozzle 17. The joint 22 is provided with an inlet 22a for receiving the liquid 5 (arrow a) fed through the liquid feed pipe 7 inside. The inlet 22 a is provided inside the discharge nozzle 17 and communicates with an introduction channel 23 that introduces the liquid 5 into the storage chamber S. That is, the introduction channel 23 communicates with the storage chamber S via the inlet 22a formed on the side surface 17c of the discharge nozzle 17 and the outlet 23a opened at the bottom of the recess 17d (see the bottom surface 17f shown in FIG. 3). I have. The outlet 23a functions as a supply hole for supplying the liquid 5 to be discharged to the storage chamber S.

  Here, an intermediate portion of the introduction flow path 23, that is, a flow path from the inlet 22a to the outlet 23a has a shape inclined from the inlet 22a toward the outlet 23a. As a result, the introduction flow path 23 is formed in the discharge nozzle 17 in a linear shape without a bent portion. Therefore, it is possible to provide a structure in which clogging due to the liquid 5 or foreign matter remaining inside the introduction flow channel 23 is unlikely to occur. Further, in maintenance work required at the time of liquid exchange or the like, a tool such as a cleaning pin can be inserted into the introduction flow path 23 to easily clean the inside of the introduction flow path 23.

  A discharge channel 24a is provided at the bottom of the recess 17d (see the bottom surface 17f shown in FIG. 3). The discharge channel 24a communicates with a discharge port 24 opened on the lower surface 17b of the discharge nozzle 17 to discharge the liquid 5 in the storage chamber S to the outside. The discharge channel 24a has a tapered hole shape in which the lower radial dimension is narrowed, and the diameter increases toward the storage chamber S side. Here, the position of the discharge flow path 24a is located away from the center position in the storage chamber S on the side opposite to the outlet 23a. With such an arrangement, the liquid 5 supplied into the storage chamber S from the outlet 23a in the liquid discharge that reciprocates the one end 11b in the storage chamber S forms an air pocket in the storage chamber S. Thus, it is possible to prevent the ejection failure due to the air pool remaining in the storage chamber S.

  In discharging the liquid 5 by the liquid discharge device 1, first, the liquid 5 is supplied from the liquid supply unit 2 into the storage chamber S via the liquid feed pipe 7 and the introduction flow path 23. Next, the actuator 12 is charged by the actuator control unit 14, and the pressing member 11 is extended by a predetermined stroke against the urging force of the annular spring 13. As a result, the volume of the storage chamber S changes, and the liquid 5 is discharged from the discharge port 24 at one end of the discharge flow path 24a.

  After the ejection, the actuator 12 is discharged to discharge the actuator 12 so that the expansion of the actuator 12 is returned to the original state. The urging force of the annular spring 13 pushes up the pressing member 11, so that the next liquid ejection can be performed. That is, the actuator 12, the annular spring 13, and the actuator control unit 14 change the volume of the storage chamber S by reciprocating the pressurizing member 11 to thereby drive the drive unit 15 that discharges the liquid 5 from one end of the discharge flow path 24 a. Has become.

  FIG. 4 is an exploded perspective view of components assembled on the mounting surface 9b of the discharge nozzle mounting section 9. That is, when assembling these components, the first packing 19A is attached to one end 11b of the pressing member 11 protruding from the attachment surface 9b of the discharge nozzle attachment portion 9. Next, the gasket 20 and the discharge nozzle 17 are overlapped, the fastening bolt 25 is inserted into the fastening hole 17i provided on the lower surface 17b of the discharge nozzle 17, and screwed into the screw hole 9e formed on the mounting surface 9b. To conclude.

  The hatched portion on the lower surface 17b indicates a peripheral portion 17b * pressed against the mounting surface 9b by the fastening bolt 25 in the discharge nozzle 17. That is, in the example shown in FIG. 4, the fastening bolt 25 presses the peripheral portion 17b * of the discharge nozzle 17 against the mounting surface 9b of the head main body 10 so that the upper surface 17a of the discharge nozzle 17 is in close contact with the head main body 10. It functions as a mounting member to be mounted. As a result, as shown in FIG. 5, the discharge nozzle 17 is mounted on the mounting surface 9 b of the discharge nozzle mounting section 9 by screw fastening with the fastening bolt 25.

  Here, the thickness of the discharge nozzle 17 in the recess 17d will be described with reference to FIGS. In the liquid ejection device 1 shown in the present embodiment, the deflection of the ejection nozzle 17 can be allowed while reducing the volume of the storage chamber S for the purpose of ensuring good ejection performance for the high-viscosity liquid 5. The dimensions of each part of the discharge nozzle 17 are set so as to be able to be reduced within the range. That is, the thickness T2 (the thickness between the bottom surface 17f and the lower surface 17b) of the recess 17d of the discharge nozzle 17 shown in FIG. 3 is changed to the thickness T1 (the thickness between the upper surface 17a and the lower surface 17b) of the peripheral portion 17b * shown in FIG. (Same as the thickness T1 between them).

  By adopting such dimensional settings, the thickness of the concave portion 17d can be reduced while increasing the thickness of the peripheral portion 17b * and securing the rigidity of the entire discharge nozzle 17. This makes it possible to reduce the volume of the discharge flow path 24a provided in the concave portion 17d, thereby making it possible to miniaturize the droplet to be applied.

  Preferably, the thickness T2 of the recess 17d of the discharge nozzle 17 is set to be not more than 1/3 of the thickness T1 of the peripheral portion 17b * shown in FIG. In this case, the lower end surface 11c of the one end 11b of the pressing member 11 is inserted into the recess 17d to a position at least half the thickness T1 of the peripheral portion 17b *. That is, the dimensions are set such that the penetration depth D of the one end portion 11b shown in FIG. 3 is equal to or more than の of the thickness T1 of the peripheral portion 17b *.

  By adopting such a dimension setting, the rigidity required of the discharge nozzle 17 with respect to the pressing force by the pressurizing member 11 required for favorably discharging the high-viscosity liquid 5 is secured, and It is possible to set the storage chamber S to an appropriate volume suitable for discharging the high-viscosity liquid 5 while avoiding an increase in the viscous resistance at the time of discharging the liquid 5 by excessively reducing the diameter of the storage chamber S. it can.

  In the liquid ejection device 1 according to the present embodiment, the configuration of the introduction flow path for introducing the liquid 5 into the storage chamber S in the ejection nozzle 17 (FIGS. 6 and 7), and the ejection nozzle 17 is attached to the ejection nozzle 17 A plurality of modifications are possible in the form of the mounting member (FIGS. 8 to 10) mounted on the mounting surface 9b of the part 9.

  First, a first modification (FIG. 6) and a second modification (FIG. 7) of the introduction flow channel in the discharge nozzle 17 will be described with reference to FIGS. 6 and 7, a joint 22 similar to that of FIG. 3 is implanted on the side surface 17c of the discharge nozzle 17. The inlet 22 a provided inside the joint 22 communicates with an introduction flow path 123 that is horizontally guided inside the discharge nozzle 17. The introduction flow path 123 opens to the side wall 17e of the recess 17d to introduce the liquid 5 into the storage chamber S. That is, the introduction flow passage 123 communicates with the storage chamber S via the inlet 22a formed on the side surface 17c of the discharge nozzle 17 and the outlet 123a opened on the side wall 17e of the recess 17d. By guiding the introduction flow path 123 horizontally inside the discharge nozzle 17 in this manner, processing for forming the introduction flow path 123 can be facilitated.

  In the first modification shown in FIG. 6, a cutout portion 11e in which the side surface 11d is partially cutout is provided at a position facing the outlet portion 123a on the side surface 11d of the one end portion 11b. That is, in Modification 1 shown here, the pressing member 11 has a form having a cutout portion 11e extending from the side surface 11d facing the outlet portion 123a in the direction of the bottom surface 17f of the concave portion 17d. The liquid 5 introduced from the introduction channel 123 and supplied from the outlet 123a is introduced into the storage chamber S via the cutout 11e. Thereby, clogging in the flow path from the outlet 123a to the storage chamber S can be prevented.

  Further, in Modification Example 2 shown in FIG. 7, a cutout portion 17h in which the side wall 17e is partially cutout is provided at a position where the outlet portion 123a is opened in the side wall 17e of the concave portion 17d. That is, in the modified example 2 shown here, the discharge nozzle 17 has a form in which a notch 17h extending from the outlet 123a in the direction of the bottom surface 17f of the recess 17d is provided on the side wall 17e of the recess 17d. The liquid 5 introduced from the introduction channel 123 and supplied from the outlet 123a is introduced into the storage chamber S via the notch 17h. Thus, similarly, clogging in the flow path from the outlet 123a to the storage chamber S can be prevented.

  Next, a modification (modification 3) of the form of the mounting member will be described with reference to FIGS. In the basic example shown in FIG. 4, the discharge nozzle 17 is mounted on the mounting surface 9b of the discharge nozzle mounting portion 9 by directly attaching the discharge nozzle 17 to the mounting surface 9b of the discharge nozzle mounting portion 9 by a fastening bolt 25 as a mounting member. It is designed to be fastened with screws. On the other hand, in the modified example 3 shown in FIGS. 8 to 10, the discharge nozzle 117 is connected to the mounting surface 9 b of the discharge nozzle mounting portion 9 via a pair of separate members (fasteners 26) screwed to the mounting surface 9 b. It is designed to be attached to. That is, in the third modification, the fastening bolt 25 and the fastener 26 are the mounting members.

  8, the discharge nozzle 117 has an upper surface 117a, a lower surface 117b, and a side surface 117c, similarly to the discharge nozzle 17 in FIG. The upper surface 117a (the lower surface in FIG. 8) is provided with a recess 117d having the same function as the recess 17d shown in FIGS. 2 and 3, and a storage chamber S (see FIG. 10). The lower surface 117b (the upper surface in FIG. 8) has an opening 24 in communication with the recess 117d, and a joint 22 for supplying the liquid 5 is provided on the side surface 117c.

  A peripheral portion 117b * (see a hatched portion) having the same technical significance as the peripheral portion 17b * in FIG. 4 is formed in the discharge nozzle 117 by cutting off both side edges of the lower surface 117b into a stepped shape. I have. The pair of fasteners 26 are provided with holding portions 26a whose upper portions project in opposite directions. When the discharge nozzle 117 is mounted on the discharge nozzle mounting portion 9, the fastener 26 is screw-fastened to the mounting surface 9 b by the fastening bolt 25 with the holding portion 26 a in contact with the peripheral portion 117 b *.

  That is, as shown in FIG. 8, first, the first packing 19A is mounted on the one end 11b, and then the gasket 20 and the discharge nozzle 117 are set on the mounting surface 9b in an overlapping manner. Then, with the holding portion 26a in contact with the peripheral portion 117b *, the fastening bolt 25 is inserted into the fastening hole 26b provided in the fastener 26, and the fastening bolt 25 is inserted into the screw hole 119e formed in the mounting surface 9b. Screw and fasten. As a result, as shown in FIG. 9, the discharge nozzle 117 is mounted on the mounting surface 9b of the discharge nozzle mounting portion 9 in a state where the peripheral portion 117b * is pressed by the pressing portions 26a of the pair of fasteners 26.

  Next, the thickness of the concave portion 117d of the discharge nozzle 117 according to the third modification will be described with reference to FIG. FIG. 10 shows a partial cross section in the direction A in FIG. Similarly to the basic examples shown in FIGS. 2 and 3, in the third modification, the discharge nozzle 117 is formed while reducing the volume of the storage chamber S in order to secure good discharge performance for the high-viscosity liquid 5. The dimensions of each part of the discharge nozzle 117 are set so that the deflection of the discharge nozzle 117 can be reduced within an allowable range. That is, the thickness T2 of the recess 117d of the discharge nozzle 117 shown in FIG. 10 is set to be equal to or less than half the thickness T1 of the peripheral portion 117b *.

  By adopting such a dimension setting, the thickness of the concave portion 117d can be reduced while the thickness of the peripheral portion 117b * is increased and the rigidity of the entire discharge nozzle 117 is secured. Thus, the volume of the discharge channel 24a provided in the concave portion 117d can be reduced, and the droplet to be applied can be miniaturized.

  Desirably, the thickness T2 of the recess 117d of the discharge nozzle 117 is set to be 1/3 or less of the thickness T1 of the peripheral portion 117b *. In this case, the lower end surface 11c of the one end 11b of the pressing member 11 is inserted into the recess 117d to a position at least half the thickness T1 of the peripheral portion 117b *. That is, the dimensions are set such that the penetration depth D of the one end 11b shown in FIG. 3 is equal to or more than １ ／ of the thickness T1 of the peripheral portion 117b *. By adopting such dimension setting, the same effect as in the basic example shown in FIGS. 2 and 3 can be obtained.

  As described above, in the present embodiment, the pressurizing member 11 that is reciprocally mounted on the discharge nozzle mounting portion 9 of the head main body 10 and has one end 11b protruding in the reciprocating direction and the pressing member 11 protruding. A concave portion 17d surrounding the one end 11b of the pressure member 11 and serving as the storage chamber S, an introduction flow path 23 for introducing the liquid 5 into the storage chamber S, and a discharge flow path 24a for discharging the liquid 5 in the storage chamber S to the outside. And a discharge nozzle 17 having a discharge nozzle 17 provided with a pressure source. The liquid discharge device 1 is configured to discharge the liquid 5 by pressurizing the liquid 5 in the storage chamber S. A first packing 19A for preventing the liquid 5 in the storage chamber S from coming into contact with the discharge nozzle mounting portion 9 is provided therebetween.

  Thus, the first packing 19A can seal the space between the one end 11b and the discharge nozzle mounting portion 9, thereby preventing the liquid 5 from entering the gap between the one end 11b and the discharge nozzle mounting portion 9. can do. At the same time, since the one end 11b of the pressurizing member 11 protrudes from the mounting surface 9b of the discharge nozzle mounting portion 9, cleaning of the discharge nozzle mounting portion 9 of the head main body 10 can be performed with good workability during maintenance. Maintenance work such as cleaning at the time of liquid exchange is facilitated.

  In the liquid ejection apparatus 1 according to the present embodiment, the pressure member 11 is reciprocally attached to the ejection nozzle attachment portion 9 of the head body 10 and has one end 11b protruding in the reciprocation direction, and the side surface 17c. A lower surface 17b and an upper surface 17a, a concave portion 17d serving as a storage chamber S into which one end portion 11b of the pressurizing member 11 enters, and an introduction channel 23 for introducing the liquid 5 into the storage chamber S; A discharge nozzle 17 having a discharge flow path 24a for discharging the liquid 5 in the storage chamber S to the outside, and an upper surface 17a of the discharge nozzle 17 is pressed against the head body 10 by pressing a peripheral portion 17b * of the discharge nozzle 17 against the head body 10. And a mounting member that is mounted in a state in which the liquid 5 is ejected by pressurizing the liquid 5 in the storage chamber S. It is to be set to 1/2 or less of the peripheral portion 17b * of the wall thickness T1 of the thickness T2 in.

  Further, the discharge nozzle 17 mounted on the discharge nozzle mounting portion 9 is formed into a shape having an upper surface 17a, a lower surface 17b, and a side surface 17c, a concave portion 17d serving as a storage chamber S formed on the upper surface 17a, and an inlet formed on the side surface 17c. A liquid introduction passage 23 communicating from the portion 22a to the outlet 23a formed on the bottom surface 17f of the recess 17d, a discharge passage 24a penetrating from the bottom 17f of the recess 17d to the lower surface 17b, and a head body by a mounting member. And a peripheral portion 17b * pressed against the mounting surface 9b of the portion 10 so that the thickness T2 of the recess 17d of the discharge nozzle 17 is set to be equal to or less than 1/2 of the thickness T1 of the peripheral portion 17b *. I have.

  Accordingly, the thickness of the concave portion 17d can be reduced while the thickness of the peripheral portion 17b * is increased and the rigidity of the entire discharge nozzle 17 is secured, and excellent discharge can be achieved for the high-viscosity liquid 5. can do.

  The liquid ejecting apparatus of the present invention has an effect that a liquid ejecting apparatus that can easily perform maintenance work such as cleaning at the time of liquid replacement can be provided, and is useful in the field of ejecting a liquid by pressurizing the liquid. is there.

DESCRIPTION OF SYMBOLS 1 Liquid discharge device 2 Liquid supply part 3 Discharge head 4 Tank 5 Liquid 8 Base part 9 Discharge nozzle mounting part 9c Opening 10 Head main body part 11 Pressurization member 11b One end part 12 Actuator 13 Ring spring 14 Actuator control part 15 Drive part 17 , 117 Discharge nozzles 17a, 117a Upper surface 17b, 117b Lower surface 17b *, 117b * Peripheral portion 17c, 117c Side surface 17d, 117d Recess 19A First packing 19B Second packing 20 Gasket 22a Inlet 23,123 Introductory flow passage 23a, 123a Outlet 24a Discharge channel S Storage chamber

Claims (4)

A liquid ejection device that ejects a liquid by pressurizing the liquid,
A head body,
A pressure member mounted on the head body so as to be able to reciprocate, and one end of which protrudes from the head body in the reciprocation direction;
A recess forming a storage chamber that is detachable from the head main body and faces one end of a pressure member protruding from the head main body; an introduction flow path for introducing a liquid into the storage chamber; and a bottom of the recess. A discharge nozzle having a discharge flow path formed in
A driving unit that discharges liquid from one end of the discharge channel by changing the volume of the storage chamber by reciprocating the pressure member,
A liquid discharging apparatus comprising a packing between a side wall of the concave portion and a side surface of the pressure member for preventing the liquid in the storage chamber from contacting the head body. The liquid ejection device according to claim 1, wherein at least a part of the pressure member is located inside the head body. The head main body has a mounting surface to be mounted with the discharge nozzle,
  The liquid ejection device according to claim 1, wherein the mounting surface is located on a side of an outer periphery of the pressure member. 4. The liquid ejection device according to claim 1, wherein a holding portion that holds the packing is formed above the concave portion. 5.

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