JP6596662B2 - Liquid ejection device - Google Patents

Description

  The present invention relates to a liquid ejection device that ejects liquid by pressurizing liquid in a storage chamber.

  In various technical fields such as the electronic device manufacturing field, liquid discharge devices that discharge liquids such as adhesives and cream solder in the form of droplets are widely used. Since many liquids to be ejected have a high viscosity, a configuration for ejecting from the ejection holes by pressurizing the liquid stored in the storage chamber is known as a liquid ejecting apparatus for ejecting this type of liquid. (For example, refer to Patent Document 1). In the prior art shown in this patent document example, a first member (pressurizing member) that is movably inserted into an opening formed in the 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 in which liquid is stored is formed by a second member (discharge nozzle) provided with holes, and a gap between the first member and the opening is sealed by a seal member. With this configuration, air can be prevented from being sucked into the storage chamber from the outside when the liquid is discharged, and stable liquid discharge can be maintained.

JP 2014-501080 A

  There are various uses of the liquid ejection device, and various liquids having different physical properties are to be ejected depending on the usage. Therefore, the liquid ejection device is also required to have a configuration in consideration of such physical properties. For example, in the case of targeting liquids having different volumetric elastic modulus, which is an index indicating the compressibility of the liquid to be discharged, the rated volume of the storage chamber to which the liquid is pressurized corresponds to the volumetric elastic modulus of the target liquid. It is desirable to set the optimum value. In a specific example, in the case of a highly compressible liquid, it is desirable to reduce the rated volume of the storage chamber in order to reduce the influence on the discharge response due to compression during pressurization.

  However, in the above-described prior art, it has not been configured to be able to adjust the rated volume of the storage chamber. For this reason, the rated volume of the storage chamber is not necessarily an optimum value according to the physical properties such as the volume modulus of the liquid to be discharged, and it has been difficult to achieve a desired liquid discharge performance. As described above, in the conventional liquid ejection device, it is possible to achieve a desired liquid ejection performance for a plurality of types of liquids having different physical properties due to the fact that the rated volume of the storage chamber cannot be adjusted. There was a problem that it was difficult.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting apparatus capable of realizing a desired liquid ejecting performance using a plurality of types of liquids having different physical properties as ejection targets.

  A liquid discharge apparatus according to the present invention is a liquid discharge apparatus that discharges liquid by pressurizing liquid in a storage chamber, and is attached to a head main body portion and the head main body portion so as to be reciprocally movable, and one end portion of the liquid discharge device is A pressure member protruding in the reciprocating direction from the head main body and a plate-like member having a predetermined thickness that is detachable from the head main body and surrounds one end of the pressure member protruding from the head main body In addition, a spacer having an opening serving as the storage chamber, an introduction flow path that is attached to the head main body through the spacer in a state of closing the opening, and introduces liquid into the storage chamber, and the storage A nozzle member having a discharge channel for discharging the liquid in the chamber to the outside, and a drive unit for discharging the liquid from the discharge channel by reciprocating the pressure member to change the volume of the storage chamber; in front A packing for preventing the liquid in the storage chamber from contacting the head main body, and the spacer is mounted on the first spacer and the first spacer mounted on the head main body. The first spacer is formed with a holding portion for holding the packing, and the rated volume of the storage chamber defined by design information is determined by the thickness of the second spacer. It was configured to make adjustments.

  A liquid discharge apparatus according to the present invention is a liquid discharge apparatus that discharges liquid by pressurizing liquid in a storage chamber, and is attached to a head main body portion and the head main body portion so as to be reciprocally movable, and one end portion of the liquid discharge device is A pressure member protruding in the reciprocating direction from the head main body and a plate-like member having a predetermined thickness that is detachable from the head main body and surrounds one end of the pressure member protruding from the head main body In addition, a spacer having an opening serving as the storage chamber, an introduction flow path that is attached to the head main body through the spacer in a state of closing the opening, and introduces liquid into the storage chamber, and the storage A nozzle member having a discharge channel for discharging the liquid in the chamber to the outside, and a drive unit for discharging the liquid from the discharge channel by reciprocating the pressure member to change the volume of the storage chamber; in front A packing for preventing the liquid in the storage chamber from contacting the head main body, and the spacer is mounted on the first spacer and the first spacer mounted on the head main body. The first spacer is formed with a holding portion for holding the packing, and the second spacer is selected based on the properties of the liquid to be ejected.

  ADVANTAGE OF THE INVENTION According to this invention, desired liquid discharge performance can be implement | achieved by making multiple types of liquid from which a physical property differs into discharge object.

Structure explanatory drawing of the liquid discharge apparatus of one embodiment of this invention Sectional drawing of the discharge head of the liquid discharge apparatus of one embodiment of this invention Structure explanatory drawing of the storage chamber in the discharge head of the liquid discharge apparatus of one embodiment of this invention 1 is an exploded perspective view of a discharge nozzle in a liquid discharge apparatus according to an embodiment of the present invention. The perspective view of the discharge nozzle in the liquid discharge apparatus of one embodiment of this invention Explanatory drawing which shows the correlation with the physical property of the liquid used as the discharge object of the liquid discharge apparatus of one embodiment of this invention, and the height of a storage chamber Structure explanatory drawing of the discharge nozzle (modification 1) in the liquid discharge apparatus of one embodiment of this invention Structure explanatory drawing of the discharge nozzle (modification 2) in the liquid discharge apparatus of one embodiment of this invention Structure explanatory drawing of the discharge nozzle (modification 3) in the liquid discharge apparatus of one embodiment of this invention

  Next, embodiments 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 the liquid in a storage chamber, and includes a liquid supply unit 2 that supplies a liquid to be discharged and a discharge head that discharges 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 an air pressure supply source. The air compressor 6 supplies 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 pushed out by air pressure and 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 9 a and an upper opening, and a flat base portion 8 is mounted on the opening side of the discharge nozzle mounting portion 9. Yes. The base portion 8 and the discharge nozzle mounting portion 9 are a head main body portion 10 that constitutes the main body of the discharge head 3. A nozzle member 17 is mounted on the lower surface of the bottom plate portion 9 a of the discharge nozzle mounting portion 9 via a spacer 16. Here, the spacer 16 includes a first spacer 16 </ b> A and a second spacer 16 </ b> B, and the spacer 16 and the nozzle member 17 constitute a discharge nozzle 18 that discharges the liquid 5.

  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 feeding pipe 7 and the nozzle member 17. Are 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 the side plate portion 9d is extended upward from both side end portions of the flat bottom plate portion 9a, and the base portion 8 is fixedly mounted on the upper end portion of the side plate portion 9d. . A pressure member 11 is disposed on the lower surface of the actuator 12 whose upper surface is in contact with the lower surface of the base portion 8.

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

  A first spacer 16A is mounted on the mounting surface 9b of the discharge nozzle mounting portion 9 via a first gasket 20A, and a second spacer 16B is mounted on the lower surface of the first spacer 16A via a second gasket 20B. Is installed. The first spacer 16A and the second spacer 16B constituting the spacer 16 are both plate-like members that are detachably attached to the head main body 10 and have predetermined thicknesses tA and tB (see FIG. 3), respectively. The first spacer 16A and the second spacer 16B are provided with openings 16a having the same diameter as or slightly smaller in diameter than the openings 9c (see also FIG. 4). In a state where the pressure member 11 is mounted on the discharge nozzle mounting portion 9 of the head main body portion 10, the one end portion 11b of the pressure member 11 protruding downward from the discharge nozzle mounting portion 9 is the first spacer 16A, the second spacer 16A. The spacer 16B is surrounded by the opening 16a of the spacer 16.

  As shown in FIG. 3, a holding portion 16b for holding the first packing 19A is formed above the opening 16a of the first spacer 16A. By holding the first packing 19A on the holding portion 16b, the first packing 19A is positioned between the first spacer 16A and the side surface of the one end portion 11b of the pressing member 11. Thus, the liquid 5 in the storage chamber S is prevented from entering the gap between the side surface of the opening 9c and the side surface of the one end portion 11b. Thus, by providing the holding portion 16b for holding the first packing 19A on the upper portion of the opening portion 16a of the first spacer 16A, the processing for forming the holding portion 16b is facilitated and held. The liquid 5 and other foreign matters that have entered the portion 16b can be easily cleaned.

  A nozzle member 17 is mounted on the lower surface side of the second spacer 16B via a third gasket 20C. The nozzle member 17 is mounted on the second spacer 16B while closing the opening 16a of the second spacer 16B. In this state, the nozzle member 17 is stored between the mounting surface 17a of the nozzle member 17 and the lower end surface 11c of the one end portion 11b. A chamber S is formed. In other words, the spacer 16 including the first spacer 16A and the second spacer 16B, which are plate-like members, surrounds the one end portion 11b of the pressure member 11 protruding downward from the discharge nozzle mounting portion 9, and the storage chamber S. An opening 16a is provided. In the present embodiment, the rated volume VR of the storage chamber S (the volume of the storage chamber S when the actuator 12 is in the contracted state and the pressure member 11 is located at the top dead center) is used as the first spacer. Adjustment is made by changing the total thickness t of the spacer 16 comprising 16A and the second spacer 16B.

  The rated volume VR of the storage chamber S is defined by design information indicating dimensions of each part of the discharge head 3. In this design information, since the diameter size of the pressure member 11 is normally fixed, as a method of adjusting the rated volume VR of the storage chamber S, the overall thickness t of the spacer 16 is determined according to the rated volume VR. . In the present embodiment, the spacer 16 is constituted by a first spacer 16A that is mounted on the discharge nozzle mounting portion 9 of the head body 10 and at least one second spacer 16B that is mounted on the first spacer 16A. Therefore, the following two methods can be used as a method of adjusting the total thickness t of the spacer 16.

  First, in the first method, a desired overall thickness t corresponding to the rated volume VR defined by the design information is realized by a combination of the first spacer 16A and the second spacer 16B. That is, a combination of the first spacer 16A and the second spacer 16B is selected such that the thickness obtained by adding the thickness of the second gasket 20B to the thicknesses tA and tB shown in FIG. In this case, as long as the desired overall thickness t is achieved, the first spacer 16A and the second spacer 16B in which the holding portion 16b is formed in the opening portion 16a have an arbitrary thickness. You can choose from what you have. That is, in the first method, the rated volume VR of the storage chamber S defined by the design information is adjusted by the combination of the first spacer 16A and the second spacer 16B.

  On the other hand, in the second method, as the first spacer 16A in which the holding portion 16b is formed in the opening portion 16a, one type having a fixed thickness tA is used in advance. When it is necessary to change the total thickness t in order to adjust the rated volume VR, the second spacer 16B having a thickness tB corresponding to the desired total thickness t is selected. That is, in the second method, the thickness tA of the first spacer 16A is fixedly set, and the rated volume VR of the storage chamber S defined by the design information is adjusted by the thickness tB of the second spacer 16B. Do.

  In both the first method and the second method described above, a plurality of second spacers 16B having different thicknesses tB are prepared. Then, one second spacer 16B selected based on the rated volume VR of the storage chamber S is mounted on the discharge nozzle mounting portion 9 of the head main body 10 together with the first spacer 16A.

  Here, the first gasket 20A is mounted on the upper surface of the first spacer 16A, the second gasket 20B is mounted between the first spacer 16A and the second spacer 16B, and the third gasket 20C is mounted on the lower surface of the second spacer 16B. However, the second gasket 20B and the third gasket 20C are not indispensable, and if the first gasket 20A is provided at least between the discharge nozzle mounting portion 9 of the head main body 10 and the first spacer 16A. Good. In particular, when the first spacer 16A is formed of a material that does not have a gasket function, it is necessary to mount the first gasket 20A.

  By providing the first gasket 20A in this manner, the cleaning liquid or the scattered liquid 5 enters from between the head main body 10 and the first spacer 16A, and the one end portion 11b and the bottom plate portion 9a of the pressure member 11 are inserted. Can be prevented from entering the gap. On the other hand, when the first spacer 16A is formed of a material having a gasket function such as rubber, the first gasket 20A and the second gasket 20B need not be specially provided.

  In FIG. 2, a joint 22 connected to the liquid feeding pipe 7 shown in FIG. The joint 22 is provided with an inlet portion 22a for receiving the liquid 5 (arrow a) fed through the liquid feed pipe 7 therein. The inlet portion 22 a communicates with an introduction flow path 23 that is provided inside the nozzle member 17 and introduces the liquid 5 into the storage chamber S. That is, the introduction flow path 23 communicates with the storage chamber S via an inlet portion 22a formed on the side surface of the nozzle member 17 and an outlet portion 23a opened on the mounting surface 17a of the nozzle member 17 (see FIG. 3). The outlet 23 a functions as a supply hole for supplying the liquid 5 to be discharged to the storage chamber S.

  Here, the introduction flow path 23 has a shape inclined from the inlet portion 22a opened on the side surface of the nozzle member 17 toward the outlet portion 23a. As a result, the introduction flow path 23 is formed in a linear shape without a bent portion inside the nozzle member 17. For this reason, it can be set as the structure where clogging by the liquid 5 remaining in the introduction flow path 23, a foreign material, etc. does not generate | occur | produce easily. Further, in the maintenance work required when the liquid is exchanged, it is possible to easily clean the inside of the introduction flow path 23 by inserting a tool such as a cleaning pin through the introduction flow path 23.

  The nozzle member 17 is provided with a discharge flow path 24 a that communicates from the storage chamber S to a discharge port 24 provided on the lower surface of the nozzle member 17 and discharges the liquid 5 in the storage chamber S to the outside. The discharge flow path 24a has a tapered hole shape with a reduced diameter in the lower part, and the diameter increases toward the storage chamber S side. Here, the position of the discharge port 24 is arranged so as to be separated from the center position in the storage chamber S on the side opposite to the outlet portion 23a. With such an arrangement, the liquid 5 supplied into the storage chamber S from the outlet 23a in the liquid discharge for reciprocating the one end portion 11b in the storage chamber S forms an air pool in the storage chamber S. The whole can be filled without any discharge failure due to the accumulation of air remaining in the storage chamber S.

  When the liquid 5 is discharged by the liquid discharge apparatus 1, first, the liquid 5 is supplied from the liquid supply unit 2 into the storage chamber S through the liquid supply pipe 7 and the introduction flow path 23. Next, the actuator 12 is charged by the actuator controller 14 and the pressure member 11 is extended by a predetermined stroke against the urging force of the annular spring 13. Thereby, the volume of the storage chamber S changes, and the liquid 5 is discharged from the discharge port 24 through the discharge flow path 24a.

  After discharging, the actuator 12 is discharged to return the extension of the actuator 12 and the pressure member 11 is pushed up by the urging force of the annular spring 13 so that the next liquid discharge is possible. That is, the actuator 12, the annular spring 13, and the actuator control unit 14 become the drive unit 15 that discharges the liquid 5 from the discharge flow path 24 a by changing the volume of the storage chamber S by reciprocating the pressure member 11. Yes.

  FIG. 4 is an exploded perspective view of components assembled to the mounting surface 9 b of the discharge nozzle mounting portion 9. That is, when assembling these components, the first packing 19 </ b> A is mounted on the one end portion 11 b of the pressure member 11 protruding from the mounting surface 9 b of the discharge nozzle mounting portion 9. Next, the first gasket 20A, the first spacer 16A, the second gasket 20B, the second spacer 16B, the third gasket 20C, and the nozzle member 17 are sequentially stacked. Then, the fastening bolts 25 are inserted into the fastening holes 17c provided in the discharge surface 17b of the nozzle member 17, and are screwed into the screw holes 9e formed in the mounting surface 9b to be screwed. As a result, as shown in FIG. 5, the discharge nozzle 18 in which the first spacer 16 </ b> A, the second spacer 16 </ b> B, and the nozzle member 17 are stacked on the mounting surface 9 b of the discharge nozzle mounting portion 9 is screwed by the fastening bolt 25. It will be in the state.

  Next, the relationship between the storage chamber height h of the storage chamber S and the physical properties of the liquid 5 in the discharge of the liquid 5 will be described with reference to FIG. The rated volume VR of the storage chamber S shown in FIG. 6A is a clearance between the mounting surface 17a of the nozzle member 17 and the lower end surface 11c of the one end portion 11b under the condition that the diameter size of the one end portion 11b is constant. It is proportional to the storage chamber height h. In other words, the rated volume VR and the storage chamber height h are technically equivalent under such conditions. In the liquid discharge apparatus 1 having the storage chamber S having such a configuration, the droplet discharge characteristics (here, the flying speed v of the droplet discharged from the discharge port 24) and the storage chamber height h are correlated, There is an optimum storage chamber height h that maximizes the flight speed v.

  The optimum storage chamber height h at which the flight speed v is maximized is not constant depending on the type of the liquid 5, and the optimum storage chamber height h is different for liquids 5 having different physical properties. Here, the physical property value of the liquid 5 may include a volume modulus of elasticity indicating the compression behavior of the liquid 5 when the liquid 5 is pressurized by the pressure member 11. Further, as a physical property value to be considered, a thixo ratio indicating the time dependence of the viscosity of the liquid 5 may be used in addition to the bulk modulus.

  FIG. 6B shows the change in the flight speed v when the storage chamber height h is changed for the two types of liquids 5 (liquids 5A and 5B) having different physical property values (volume modulus in this case). Are shown in graph A and graph B, respectively. That is, for the liquid 5A, the maximum flight speed v can be obtained with the storage chamber height h being the height h1. On the other hand, for the liquid 5B having different physical property values, it is shown that the maximum flight speed v can be obtained in a state where the storage chamber height h is higher than the height h2.

  When the liquid ejection apparatus 1 is operated and the liquid 5 is ejected from the ejection head 3, first, the optimum storage chamber height h that can obtain the maximum flight speed v corresponding to the physical properties of the liquid 5 to be ejected. Is selected from data such as the graph shown in FIG. Next, the first spacer 16A and the second spacer 16B having an overall thickness t that can realize such an optimal storage chamber height h are selected. Thus, by selecting the first spacer 16A and the second spacer 16B so that the optimum storage chamber height h is realized based on the physical properties of the liquid 5 to be discharged in the storage chamber S, the physical properties of the storage chamber S can be improved. Desirable liquid discharge performance can be realized by using different types of liquids 5 as discharge targets.

  As a method of adjusting the overall thickness t of the spacer 16 including the first spacer 16A and the second spacer 16B based on the physical properties of the liquid 5 to be ejected, it is the same as the adjustment of the rated volume VR defined by the design information described above. In addition, the following two methods can be used. First, in the first method, a desired overall thickness t is realized based on the physical properties of the liquid 5 to be ejected by the combination of the first spacer 16A and the second spacer 16B. That is, a combination of the first spacer 16A and the second spacer 16B is selected such that the thickness obtained by adding the thickness of the second gasket 20B to the thicknesses tA and tB shown in FIG.

  In this case, as long as the desired overall thickness t is achieved, the first spacer 16A and the second spacer 16B in which the holding portion 16b is formed in the opening portion 16a have an arbitrary thickness. You can choose from what you have. That is, in the first method, the combination of the first spacer 16A and the second spacer 16B is determined based on the physical properties of the liquid 5 to be ejected.

  On the other hand, in the second method, as the first spacer 16A in which the holding portion 16b is formed in the opening portion 16a, one type having a fixed thickness tA is used in advance. When it is necessary to change the overall thickness t based on the physical properties of the liquid 5 to be ejected, the second spacer 16B having a thickness tB corresponding to the desired overall thickness t is selected. That is, in the second method, the thickness tA of the first spacer 16A is fixedly set, and the second spacer 16B is selected based on the physical properties of the liquid 5 to be ejected.

  In both the first method and the second method described above, a plurality of second spacers 16B having different thicknesses tB are prepared. Then, one or a plurality of second spacers 16B selected based on the physical properties of the liquid 5 to be discharged are mounted on the discharge nozzle mounting portion 9 of the head body 10 together with the first spacer 16A. Yes.

  In addition, in the liquid discharge apparatus 1 shown in the present embodiment, as a method for adjusting the storage chamber height h of the storage chamber S in the discharge nozzle 18, a plurality of modifications as shown in FIGS. 7 to 9 are possible. The nozzle member 17 shown in FIGS. 7 to 9 has the same configuration and function as those in the basic examples shown in FIGS.

  In the first modification shown in FIG. 7, a first spacer 16A having a thickness tA and a plurality of first spacers 16A between the mounting surface 9b of the discharge nozzle mounting portion 9 and the mounting surface 17a of the nozzle member 17 are provided. A plurality of second spacers (here, the second spacers 16B1 and 16B2) are sandwiched. Each of the first spacer 16A and the second spacers 16B1 and 16B2 is formed with an opening 16a that forms the storage chamber S while being sandwiched between the mounting surfaces 17a. A holding portion 16b for holding the first packing 19A is formed in the first spacer 16A.

  The first gasket 20A is provided between the mounting surface 9b and the first spacer 16A, the second gasket 20B is provided between the first spacer 16A and the second spacer 16B1, and the second spacer 16B1 and the second spacer 16B1 are provided. The third gasket 20C is sandwiched between the two spacers 16B2, and the fourth gasket 20D is sandwiched between the second spacer 16B2 and the mounting surface 17a. In Modification 1, the total thickness obtained by adding the thickness tB of the second spacers 16B1 and 16B2 and the thicknesses of the second gasket 20B and the third gasket 20C to the thickness tA of the first spacer 16A is shown in FIG. This corresponds to the total thickness t in the basic example.

  Next, Modification 2 shown in FIG. 8 is a gasket type in which a material such as rubber or resin that functions as a gasket is used instead of the first spacer 16A and the second spacer 16B in the basic example shown in FIG. The first spacer 16A * and the second spacer 16B * are employed. That is, the first spacer 16A * having a thickness tA * and the second spacer 16B * having a thickness tB * are sandwiched between the mounting surface 9b of the discharge nozzle mounting portion 9 and the mounting surface 17a of the nozzle member 17. The first spacer 16A * and the second spacer 16B * are formed with an opening 16a that forms the storage chamber S in a state of being sandwiched by the mounting surface 17a. Further, a holding portion 16b for holding the first packing 19A is formed in the upper first spacer 16A *.

  In this example, since the first spacer 16A * and the second spacer 16B * themselves have a gasket function, gaskets such as the first gasket 20A, the second gasket 20B, and the third gasket 20C are not required. Accordingly, the total thickness (tA * + tB *) in this case is obtained by adding the thicknesses of the first gasket 20A and the third gasket 20C to the total thickness t in the basic example shown in FIG.

  Further, in the modification 3 shown in FIG. 9, a single second spacer 16B * is used together with the first spacer 16A * in the example shown in FIG. 8, whereas a plurality of (here, two) gaskets are used. In this example, the second spacer 16B1 * (thickness tB1 *) and the second spacer 16B2 * (thickness tB2 *) are used. The first spacer 16A *, the second spacer 16B1 *, and 16B2 * are formed with an opening 16a that forms the storage chamber S while being sandwiched between the mounting surfaces 17a. The spacer 16A * is formed with a holding portion 16b for holding the first packing 19A.

  Similarly, in this example, since the first spacer 16A * and the second spacers 16B1 * and 16B2 * themselves have a gasket function, gaskets such as the first gasket 20A to the fourth gasket 20D are not required. Accordingly, the thicknesses tA * and tB1 are set so that the total thickness (tA * + tB1 * + tB2 *) matches the thickness obtained by adding the thicknesses of the first gasket 20A and the third gasket 20C to the total thickness t in the basic example shown in FIG. *, TB2 * are set.

  In the examples shown in FIGS. 8 and 9, the first spacer 16A and the second spacer 16B * are made of a material that functions as a gasket. However, the first spacer 16A and the second spacer 16A are used. You may make it use the raw material which functions as a gasket only in any one of 16B. That is, in the present embodiment, a material that functions as a gasket is used for the first spacer 16A * or the second spacer 16B *.

  As described above, in the present embodiment, the pressure member 11 that is removably mounted on the discharge nozzle mounting portion 9 of the head main body 10 and the predetermined thickness that is detachable from the discharge nozzle mounting portion 9 are provided. A spacer 16 provided with an opening 16a serving as a storage chamber S, which is a plate-like member, an introduction channel 23 that is attached to the spacer 16 so as to close the opening 16a, and introduces the liquid 5 into the storage chamber S, and storage And a nozzle member 17 having a discharge flow path 24a for discharging the liquid 5 in the chamber S to the outside, and a liquid discharge device configured to discharge the liquid 5 by pressurizing the liquid 5 in the storage chamber S by the pressurizing member 11. 1, the spacer 16 includes a first spacer 16 </ b> A attached to the discharge nozzle attaching portion 9 and a second spacer 16 </ b> B attached to the first spacer 16 </ b> A.

  The rated volume VR of the storage chamber S defined by the design information is adjusted by the combination of the first spacer 16A and the second spacer 16B, and the first spacer 16A is based on the physical properties of the liquid 5 to be ejected. And the second spacer 16B are determined. Further, when the thickness tA of the first spacer 16A in which the holding portion 16b that holds the first packing 19A is formed is fixedly set, the storage defined by the design information by the thickness tB of the second spacer 16B. The rated volume VR of the chamber S is adjusted, and the second spacer 16B is selected based on the physical properties of the liquid 5 to be ejected.

  Thereby, the storage chamber height h that is technically equivalent to the rated volume VR of the storage chamber S can be appropriately set based on the physical properties of the liquid 5 to be discharged. Therefore, even when a plurality of types of liquids 5 having different physical properties are to be ejected, it is possible to achieve a desired liquid ejection performance.

  INDUSTRIAL APPLICABILITY The liquid ejection apparatus according to the present invention has an effect that a desired liquid ejection performance can be realized by using a plurality of types of liquids having different physical properties, and is useful in the technical field of ejecting liquid by pressurizing the liquid. It is.

DESCRIPTION OF SYMBOLS 1 Liquid discharge apparatus 2 Liquid supply part 3 Discharge head 4 Tank 5 Liquid 8 Base part 9 Discharge nozzle mounting part 9c Opening part 10 Head main-body part 11 Pressurization member 11b One end part 12 Actuator 13 Annular spring 14 Actuator control part 15 Drive part 16 Spacer 16A First spacer 16B Second spacer 16a Opening 17 Nozzle member 18 Discharge nozzle 23 Introduction flow path 24a Discharge flow path S Reservoir h Reservoir height

Claims (6)

A liquid ejection device that ejects liquid by pressurizing liquid in a storage chamber,
The head body,
A pressure member attached to the head body so as to be reciprocally movable, one end of which protrudes from the head body in the reciprocating direction;
A spacer having a predetermined thickness that is detachable from the head main body, and that surrounds one end of the pressure member protruding from the head main body and includes an opening serving as the storage chamber;
A nozzle that is mounted on the head main body through the spacer in a state of closing the opening, and has an introduction channel for introducing liquid into the storage chamber, and a discharge channel for discharging the liquid in the storage chamber to the outside. Members,
A drive unit for discharging liquid from the discharge flow path by reciprocating the pressure member to change the volume of the storage chamber;
A packing for preventing the liquid in the storage chamber from contacting the head main body,
The spacer includes a first spacer attached to the head main body and at least one second spacer attached to the first spacer, and the first spacer holds the packing. A liquid ejecting apparatus configured to adjust a rated volume of the storage chamber defined by design information according to a thickness of the second spacer.   A plurality of the second spacers having different thicknesses are prepared, and at least one spacer selected based on a rated volume of the storage chamber is attached to the head main body together with the first spacer. The liquid discharge apparatus according to 1.   The liquid ejection apparatus according to claim 1, wherein a material that functions as a gasket is used for the first spacer or the second spacer. A liquid ejection device that ejects liquid by pressurizing liquid in a storage chamber,
The head body,
A pressure member attached to the head body so as to be reciprocally movable, one end of which protrudes from the head body in the reciprocating direction;
A spacer having a predetermined thickness that is detachable from the head main body, and that surrounds one end of the pressure member protruding from the head main body and includes an opening serving as the storage chamber;
A nozzle that is mounted on the head main body through the spacer in a state of closing the opening, and has an introduction channel for introducing liquid into the storage chamber, and a discharge channel for discharging the liquid in the storage chamber to the outside. Members,
A drive unit for discharging liquid from the discharge flow path by reciprocating the pressure member to change the volume of the storage chamber;
A packing for preventing the liquid in the storage chamber from contacting the head main body,
The spacer includes a first spacer attached to the head main body and at least one second spacer attached to the first spacer, and the first spacer holds the packing. And a second spacer is selected based on the physical properties of the liquid to be ejected.   A plurality of the second spacers having different thicknesses are prepared, and at least one or a plurality selected based on the physical properties of the liquid to be ejected is attached to the head main body together with the first spacer. The liquid ejection apparatus according to claim 4.   The liquid ejecting apparatus according to claim 4, wherein a material that functions as a gasket is used for the first spacer or the second spacer.

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