Bonding method for member, and assembled body of member

Abstract

To provide a bonding method for members capable of reducing cost and enhancing reliability of bonding.SOLUTION: A bonding method for members includes the steps of: assembling a first member 7, a second member 9, and an elastic member 8 so that a first space 6a adjacent to the first member 7 and the second member 9, and a second space 6b spaced apart from the first space 6a are formed, and the elastic member 8 is accommodated in the first space 6a in a compressed state; and filling a molten resin 13 in the second space 6b to bond the first member 7 and the second member 9.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a method for joining members that join a plurality of members.

Background Art

[0002] As a component used in a liquid storage container or the like, an assembly is provided in which an elastic member is compressed by a plurality of members to join each member. For joining members in such an assembly, for example, a welding machine, an injection molding machine, or the like is used. As an example of a method for joining members, Patent Document 1 describes a method for manufacturing a cap using a mold. In this manufacturing method, using a first upper mold and a common lower mold, a lower frame portion having an inner wall for accommodating an elastic plug body, which is an elastic member, is formed. The elastic plug body is accommodated in the lower frame portion, the ring-shaped protrusion portion of the second upper mold is pressed against the peripheral edge portion of the elastic plug body, and molten resin is poured into the space formed by closing the second upper mold and the common lower mold to form an upper frame portion. Thereby, a cap in which the elastic plug body is accommodated in a compressed state between the lower frame portion and the upper frame portion is obtained.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the manufacturing method described in Patent Document 1, while compressing the elastic plug body with the second upper mold, the upper frame portion is directly formed on the elastic plug body. For this reason, it is necessary to use a material for the elastic plug body that can withstand the temperature and pressure during molding. In addition, when compressing the elastic plug body with the second upper mold, it is necessary to impose restrictions on the molding conditions so that the elastic plug body does not deform too much and molten resin does not leak. Such material limitations and forming condition restrictions not only increase the manufacturing cost but also may reduce the reliability of the joint.

[0005] An object of the present invention is to provide a method for joining members that can reduce costs and improve the reliability of the joint.

Means for Solving the Problems

[0006] To achieve the above object, according to one aspect of the present invention, A method for joining members that joins a plurality of members to each other, A step of assembling the first member, the second member, and the elastic member such that a first space and a second space separated from the first space are formed adjacent to the first member and the second member, and the elastic member is accommodated in a compressed state in the first space; A method for joining members is provided, including a step of filling the second space with a first molten resin to join the first member and the second member.

[0007] According to another aspect of the present invention, there is provided a method for joining members that forms and joins members using a first mold and a second mold, A step of forming a first member in the first mold and a second member in the second mold, including forming the first member and the second member such that a first space and a second space separated from the first space are formed adjacent to the first member and the second member when the second member is assembled to the first member; A step of relatively moving the second mold with respect to the first mold to assemble the second member to the first member, the step including forming the first space and the second space, and accommodating an elastic member in a compressed state in the first space; A step of filling the second space with molten resin to join the first member and the second member, and a method for joining members is provided.

Advantages of the Invention

[0008] According to the present invention, it is possible to provide a method for joining members that can reduce costs and improve the reliability of joining.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the embodiments are merely examples and are not intended to limit the scope of the present invention to those embodiments.

[0011] First, a liquid supply member to which the method for joining members of the present invention is applied will be described. This liquid supply member is an example of an assembly of members joined to each other and is used as a stopper member (or valve member) of a liquid storage container of an inkjet recording apparatus.

[0012] FIG. 1 is a schematic diagram showing the configuration of an inkjet recording apparatus. Referring to FIG. 1, the inkjet recording apparatus 1 includes a liquid ejection head 2, a liquid storage container 3, a tube 4, hollow needles 5a, 5b, a liquid supply member 6, and a container mounting portion 30. The liquid storage container 3 stores a liquid such as ink. The liquid storage container 3 is detachably mounted on the container mounting portion 30. A liquid supply member 6 is provided at a connection portion (opening portion) between the container mounting portion 30 of the liquid storage container 3. The liquid ejection head 2 is connected to the container mounting portion 30 via the tube 4.

[0013] The container mounting portion 30 includes a liquid storage portion 31, an air communication port 32, a flow path 33, and a mounting portion 34. The mounting portion 34 is a part of the side wall of the liquid storage portion 31, and two hollow needles 5a, 5b are provided so as to penetrate this side wall. The liquid storage container 3 is mounted on the mounting portion 34 so that the hollow needles 5a, 5b are inserted into the liquid supply member 6. In a state where the liquid storage container 3 is mounted on the mounting portion 34, the liquid storage portion 31 communicates with the inside of the liquid storage container 3 via the hollow needles 5a, 5b. The air communication port 32 communicates the inside of the liquid storage portion 31 with the atmosphere.

[0014] The hollow needle 5a is longer than the hollow needle 5b. The tip of the hollow needle 5a is inserted into the interior of the liquid storage container 3, and the rear end extends to near the bottom surface of the liquid reservoir 31. The liquid inside the liquid storage container 3 flows into the liquid reservoir 31 through the hollow needle 5a. The tip of the hollow needle 5b is inserted into the interior of the liquid storage container 3, and the rear end is disposed at a position higher than the liquid level of the liquid stored in the liquid reservoir 31. The space above the liquid level in the liquid reservoir 31 communicates with the atmosphere communication port 32. By opening the hollow needle 5b to the atmosphere, it is possible to efficiently flow the liquid from the liquid storage container 3 into the liquid reservoir 31. One end of the flow path 33 opens to the inner wall of the liquid reservoir 31, and one end of the tube 4 is connected to the other end of the flow path 33. The liquid stored in the liquid reservoir 31 is supplied to the liquid discharge head 2 through the flow path 33 and the tube 4. The liquid discharge head 2 discharges the liquid supplied from the tube 4.

[0015] FIG. 2 is a schematic diagram showing the configuration of the liquid storage container 3. FIG. 2(a) shows a state in which the liquid supply member 6 is attached, and FIG. 2(b) shows a state in which each member of the liquid supply member 6 is disassembled. As shown in FIGS. 2(a) and 2(b), the liquid supply member 6 includes a first member 7, an elastic member 8, a second member 9, and a third member 10. The elastic member 8 is held in a compressed state between the first member 7 and the second member 9. The first member 7, the second member 9, and the third member 10 can be formed, for example, by injection molding. Note that the forming method of these members is not limited to injection molding. For example, each member may be formed using a 3D printer.

[0016] Next, the configuration of the liquid supply member 6 will be specifically described. Figure 3 is an enlarged view of the liquid supply member 6 shown in Figure 1. As shown in Figure 3, the first member 7 has a first surface 7a, and a first recess 7b for accommodating the elastic member 8 is provided on the first surface 7a. Here, two first recesses 7b corresponding to the two hollow needles 5a and 5b are provided adjacent to each other, and the elastic members 8 are accommodated therein. A first through-hole 7c penetrating the first member 7 in the thickness direction (X direction) is provided at the center of each first recess 7b. The diameter of the first through-hole 7c is such that the hollow needle 5a (5b) can be inserted.

[0017] Since the portions where the hollow needle 5a is inserted and the portion where the hollow needle 5b is inserted have the same structure, hereinafter, in order to avoid duplication of description, only the structure of the portion where the hollow needle 5a is inserted will be described. The second member 9 has a second surface 9a, and a contact portion 9b that faces the first recess 7b and contacts the elastic member 8 is provided on the second surface 9a. The second member 9 includes a second through-hole 9c penetrating in the thickness direction (X direction). The diameter of the second through-hole 9c is such that the hollow needle 5a can be inserted. In a state where the second member 9 is assembled to the first member 7, the contact portion 9b and the first recess 7b form a first space 6a. The elastic member 8 has a slit 8a penetrating in the thickness direction (X direction). The elastic member 8 is accommodated in the first space 6a in a compressed state. The compressed elastic member 8 is deformed so as to close the slit 8a. In a state where the second member 9 is joined to the first member 7, the first through-hole 7c and the second through-hole 9c are arranged so as to be linearly aligned via the slit 8a.

[0018] The third member 10 has a third surface 10a. The third member 10 is provided with a third through-hole 10c penetrating in the thickness direction (X direction). The third member 10 is joined to the second member 9 such that the third surface 10a abuts against the surface of the second member 9 on the opposite side of the second surface 9a. In a state where the first member 7, the second member 9, and the third member 10 are joined to each other, the first through-hole 7c, the slit 8a, the second through-hole 9c, and the third through-hole 10c are linearly arranged in the thickness direction (X direction). Thereby, it is possible to insert the hollow needle 5a (5b) into the slit 8a of the elastic member 8.

[0019] FIG. 4 is a schematic view showing a state in which two hollow needles 5a and 5b are inserted into the liquid supply member 6 shown in FIG. 3. As shown in FIG. 4, the liquid storage container 3 is attached to the container attachment portion 30 by inserting the hollow needle 5a into the slit 8a of one elastic member 8 and inserting the hollow needle 5b into the slit 8a of the other elastic member 8. Sufficient adhesion is ensured between the hollow needle 5a (5b) inserted into the slit 8a and the elastic member 8 so that liquid does not leak. An opening 50 is provided at each tip of the hollow needles 5a and 5b. The liquid inside the liquid storage container 3 flows into the opening 50 of the hollow needle 5a, and air flows into the liquid storage container 3 from the opening 50 of the hollow needle 5b. Note that, instead of the hollow needle 5b or separately from the hollow needle 5b, a connection portion for inserting an air-open hollow needle may be provided in the liquid storage container 3. By using the hollow needle 5b and another air-open hollow needle in combination, the liquid inside the liquid storage container 3 can be supplied more efficiently.

[0020] Next, a method of joining the members constituting the liquid supply member 6 will be described. FIG. 5 is a schematic view showing the procedure for joining the members of the liquid supply member 6. First, as shown in FIG. 5(a), the first member 7, the second member 9, and the third member 10 are formed. Next, as shown in FIG. 5(b), the elastic member 8 is attached to the first member 7. Finally, as shown in FIG. 5(c), the first member 7, the elastic member 8, the second member 9, and the third member 10 are assembled and joined in order. The above is an explanation of the basic configuration of the liquid supply member 6 to which the member joining method of the present invention is applied.

[0021] Next, an embodiment of the member joining method of the present invention will be described by taking the members constituting the above-described liquid supply member 6 as an example. (First Embodiment) FIG. 6 is a diagram for explaining a member joining method according to a first embodiment of the present invention. FIGS. 6(a) and 6(b) are process diagrams. FIG. 6(c) is an enlarged view of part A in FIG. 6(b). FIG. 6(d) is a plan view of the first member 7 with the elastic member 8 accommodated in the first recess 7b. In FIG. 6, the vertical relationship (the direction in the X direction) between the first member 7 and the second member 9 is opposite to that in FIG. 3.

[0022] In the member joining method of the present embodiment, the elastic member 8 is held in a compressed state between the first member 7 and the second member 9, and a part of the first member 7 and a part of the second member 9 are joined. Specifically, first, as shown in FIG. 6(a), the first member 7, the second member 9, and the elastic member 8 are prepared, and the elastic member 8 is accommodated in the first recess 7b of the first member 7. Next, as shown in FIG. 6(b), the first member 7, the second member 9, and the elastic member 8 are assembled so that the elastic member 8 is accommodated in the first space 6a in a compressed state.

[0023] In this embodiment, as shown in FIGS. 6(a) and 6(d), a second recess 7d surrounding the first recess 7b is provided on the first surface 7a. On the second surface 9a, a convex portion 9d surrounding the convex contact portion 9b and facing the second recess 7d is provided. As shown in FIG. 6(c), the edge portion 7e of the second recess 7d includes a receiving portion into which the edge portion 9e of the tip of the convex portion 9d can be fitted. By fitting the edge portion 7e of the second recess 7d and the edge portion 9e of the tip of the convex portion 9d, a second space 6b separated from the first space 6a is formed. The first space 6a and the second space 6b are adjacent to the first member 7 and the second member 9. The second space 6b is filled with a molten resin 13 which is a first molten resin. The second member 9 includes a flow path 20 communicating with the second space 6b, and the molten resin 13 can be filled into the second space 6b using this flow path 20. As the molten resin 13, for example, a thermoplastic resin or a thermosetting resin typified by polypropylene can be used. Finally, by curing the filled molten resin 13, the second recess 7d which is a part of the first member 7 and the tip portion of the convex portion 9d which is a part of the second member 9 are joined.

[0024] According to the method of joining the members of this embodiment, since the second space 6b filled with the molten resin 13 is completely separated from the first space 6a that houses the elastic member 8, it is possible to prevent the molten resin 13 from coming into contact with the elastic member 8. For this reason, for example, when the first member 7 and the second member 9 are formed and joined by applying injection molding, it is possible to suppress the material limitations and formation condition constraints that occurred in the method described in Patent Document 1. Therefore, compared with the method described in Patent Document 1, cost reduction and improvement in the reliability of joining can be achieved.

[0025] Also, by fitting the edge portion 7e of the second recess 7d and the edge portion 9e of the tip of the convex portion 9d, the sealing property of the second space 6b is enhanced. In other words, the second space 6b is a sealed space. Thereby, it is possible to prevent the molten resin 13 filled in the second space 6b from leaking out, so that the reliability of joining the members can be further enhanced.

[0026] Note that, as shown in FIG. 6(a), the height h1 of the convex portion 9d from the second surface 9a and the height h2 of the contact portion 9b from the second surface 9a have a relationship of h1 > h2. Due to this relationship, when the edge portion 9e of the tip of the convex portion 9d is fitted with the edge portion 7e of the second concave portion 7d, it is possible to suppress unnecessary interference generated between the contact portion 9b of the second member 9 and the first surface 7a of the first member 7.

[0027] Further, a third member 10 may be disposed on the side opposite to the second surface 9a of the second member 9, and the third member 10 may be joined to the second member 9. For example, a part of the third member 10 and a part of the second member 9 form a third space separated from the first space 6a. The third space is adjacent to the third member 10 and the second member 9. The third space is filled with a molten resin 13 which is a second molten resin to join the third member 10 and the second member 9. FIG. 7 is a schematic diagram showing an example of a structure in which the third member 10 is joined to the second member 9. Referring to FIG. 7, the third member 10 has a third surface 10a, and a convex portion 10d is provided on the third surface 10a. A concave portion 9g is provided on the surface (rear surface) 9f opposite to the second surface 9a of the second member 9. The convex portion 10d and the concave portion 9g respectively correspond to the convex portion 9d of the second member 9 and the second concave portion 7d of the first member 7. By fitting the edge portion 10e of the tip of the convex portion 10d of the third member 10 and the edge portion 9h of the concave portion 9g of the second member 9, a third space 6c is formed. The third member 10 is provided with a flow path (not shown) communicating with the third space 6c, and the molten resin 13 can be filled into the third space 6c using this flow path. The third space 6c is filled with the molten resin 13 to join the second member 9 and the third member 10.

[0028] Further, according to the method of joining the members of the present embodiment, the following effects are also achieved as compared with the method of joining the members using a welding machine. (Comparative Example) FIG. 8 is a diagram for explaining a method of joining members of a comparative example. In the method of joining members of this comparative example, the first member 70 and the second member 90 are joined using a welding machine. The first member 70 is different from the first member 7 in that it does not have the second recess 7d, and has the same structure as the first member 7 otherwise. The second member 90 is different from the second member 9 in that it does not have the convex portion 9d, and has the same structure as the second member 9 otherwise.

[0029] In the method of joining members of the comparative example, as shown in FIG. 8(a), the first member 70, the second member 90, and the elastic member 8 are prepared. The elastic member 8 is accommodated in the first recess 7b of the first member 70. A welding rib 12 is provided in a region adjacent to the first recess 7b on the first surface 7a. Next, as shown in FIG. 8(b), after aligning the positions of the joint portion between the first member 70 and the second member 90, ultrasonic welding is performed while applying pressure so that the welding rib 12 provided on the first member 70 is pressed against the second surface 9a of the second member 90. The energy by the ultrasonic waves is concentrated on the welding rib 12, and welding is performed using the heat (such as frictional heat) generated by the expansion and contraction of the rib.

[0030] However, in ultrasonic welding in which ultrasonic waves are applied while applying pressure, deformation, inclination, and displacement of the members may occur, the pressure applied to the welding rib 12 during welding may decrease, and the welded portion may not be properly joined. Further, if variations occur in the shape (for example, the height of the triangular shape) of the welding rib 12 or temperature variations during welding, a desired joining force may not be obtained. In either case, a sufficient joining force cannot be ensured against the repulsive force of the elastic member 8 in the compressed state, the joint portion comes off, and the compression of the elastic member 8 becomes insufficient. As a result, the sealing performance of the contact portion (interface) between the elastic member 8 and the first recess 7b decreases, and the liquid inside the liquid storage container 3 may leak.

[0031] Note that by increasing the rigidity of the portion supporting the back surface of the welding rib 12, a decrease in the pressure on the rib during welding can be suppressed. However, in this case, a shape constraint of increasing the rigidity of the supporting portion occurs. In addition, by increasing the size of the welding rib 12 or increasing its number, the joint area can be increased, and the reliability of the joint can be enhanced. However, increasing the size of the welding rib 12 increases the energy required to melt the rib. When the number of welding ribs 12 is increased, the problem of shape constraints for enhancing the rigidity of the support portion becomes even more significant.

[0032] In contrast, in the member joining method of the present embodiment, as shown in FIG. 6, the first member 7 and the second member 9 are joined by filling the second space 6b with the molten resin 13. According to this joining method, a sufficient joining force can be ensured against the repulsive force of the elastic member 8 in the compressed state as compared with the joining method of the comparative example. In particular, when injection molding is applied, the alignment of the joining portion can be accurately performed using a mold, and deformation, inclination, and misalignment of the members are also less likely to occur. Therefore, an assembly with high reliability in member joining can be provided. Further, in the elastic member 8 in the compressed state, since the pressure applied to the side surface of the hollow needle 5a (5b) inserted into the slit 8a is stabilized over the entire outer circumference, the adhesion between the side surface of the hollow needle 5a (5b) and the elastic member 8 is also stabilized. As a result, the user can easily insert and remove the hollow needle 5a (5b).

[0033] Furthermore, by expanding the second space 6b or increasing its number, the joint area can be increased, and the joining force can be further enhanced. Here, the joint area is equal to the area of the inner wall of the second space 6b. When expanding the second space 6b, for example, the widths of the second recess 7d and the first surface convex portion 9d are increased. When increasing the number of the second spaces 6b, for example, on the first surface 7a, two second recesses 7d are provided on the inner and outer sides, and on the second surface 9a, two first convex portions 9d are provided on the inner and outer sides. The inner second recess 7d and the inner first convex portion 9d form the second space 6b, and the outer second recess 7d and the outer first convex portion 9d form another second space 6b. In this way, it is possible to easily increase the size or number of the second spaces 6b.

[0034] In addition, when expanding the second space 6b, the resistance when the molten resin 13 flows in can be reduced, so that the molten resin 13 can be efficiently poured into the second space 6b. When the second space 6b is narrow, for example, due to an increase in pressure loss when filling the second space 6b with the molten resin 13, it may be difficult to pour the molten resin 13 into the entire second space 6b. In addition, the second recess 7d is groove-shaped, and the cross-sectional shape in the width direction of the bottom surface of the second recess 7d is a curved surface. Therefore, when filling the second space 6b with the molten resin 13, it is possible to easily pour the molten resin 13 in the longitudinal direction of the second recess 7d. Note that the cross-sectional shape of the bottom surface of the second recess 7d is not limited to a curved surface. As long as the molten resin 13 can flow, the cross-sectional shape of the bottom surface of the second recess 7d can be any shape.

[0035] Furthermore, the material of the molten resin 13 may be the same as or different from the materials of the first member 7 and the second member 9. When the material of the molten resin 13 is different from the materials of the first member 7 and the second member 9, the selection range of the material of the molten resin 13 is expanded. In this case, for example, as the molten resin 13, a material that can enhance the bonding strength can be used. Also, as the molten resin 13, a material that is easy to flow into the first space 6a can be used.

[0036] Furthermore, when the molten resin 13 touches the elastic member 8, the elastic member 8 may be deteriorated and deformed by heat, and the functions (such as repulsive force) required for the elastic member 8 may be reduced. When the molten resin 13 leaks from the second space 6b, means for preventing the inflow of the molten resin 13 may be provided on the first member 7 or the second member 9 so that the molten resin 13 does not reach the elastic member 8. For example, a fitting structure of the edge 7e of the second recess 7d and the edge 9e of the tip of the convex portion 9d shown in FIG. 6(c) may be applied to the first recess 7b of the first member 7 and the contact portion 9b of the second member 9. Also, on the first surface 7a of the first member 7, a wall or a groove may be provided so as to surround the first recess 7b. Further, on the second surface 9a of the second member 9, a wall or a groove may be provided so as to surround the contact portion 9b. In any case, it is possible to prevent the inflow of the molten resin 13 by the wall or the groove.

[0037] In the present embodiment, as shown in FIG. 6(c), the second recess 7d is provided in the first member 1 and the convex portion 9d is provided in the second member 9, but the present invention is not limited to this. The second recess 7d may be provided on the second surface 9a of the second member 9, and the convex portion 9d may be provided on the first surface 7a of the first member 7. Also, the shape of the fitting portion between the edge 7e of the second recess 7d and the edge 9e of the tip of the convex portion 9d is not limited to the shape shown in FIG. 6(c). As long as the leakage of the molten resin 13 can be suppressed, the fitting portion may have any shape.

[0038] (Second Embodiment) FIG. 9 is a diagram for explaining a method of joining members according to the second embodiment of the present invention. FIGS. 9(a) and 9(b) are process diagrams. FIG. 9(c) is a plan view of the first member 71 with the elastic member 8 accommodated in the first recess 7b. In FIG. 9(c), the square frame indicated by the broken line indicates the second member 91 shown in FIG. 9(a).

[0039] In the method for joining members of this embodiment, as shown in Fig. 9(a), a first member 71, an elastic member 8, and a second member 91 are prepared. The first member 71 is different from the first member 7 in that it does not have the second recess 7d, and has the same structure as the first member 7 otherwise. The second member 91 is different from the second member 9 in that it does not have the convex portion 9d, and has basically the same structure as the second member 9 otherwise. However, the size of the outer periphery of the side surface of the second member 91 is smaller than the size of the outer periphery of the side surface of the first member 71. Specifically, as shown in Fig. 9(c), the width w21 in the longitudinal direction (Y direction) of the second member 9 is smaller than the width w11 in the longitudinal direction (Y direction) of the first member 71. The width w22 in the short-side direction (Z direction) of the second member 9 is smaller than the width w12 in the short-side direction (Z direction) of the first member 71.

[0040] Also, as shown in Figs. 9(a) and 9(c), the first surface 7a of the first member 71 includes a first region 7d surrounding the first recess 7b. As shown in Fig. 9(b), in a state where the second surface 9a of the second member 91 is in contact with the first surface 7a of the first member 71, the first region 7f is adjacent to the side surface 9f of the second member 91. In this embodiment, a second space 6b for filling the molten resin 13 is formed using the first region 7f of the first member 71, the side surface 9f of the second member 91, and another member 14. The other member 14 is a member having resistance to the molten resin 13, and is, for example, a mold. For filling the molten resin 13 into the second space 6b, for example, the second member 91 or the other member 14 can be used. In this case, the second member 91 or the other member 14 is provided with a flow path communicating with the second space 6b, and the molten resin 13 is filled into the second space 6b using this flow path.

[0041] In the method for joining members of the present embodiment, first, as shown in FIG. 9(a), the elastic member 8 is housed in the first concave portion 7b of the first member 71. Next, as shown in FIG. 9(b), the first member 71, the second member 91, and the other member 14 are assembled so that the first space 6a and the second space 6b are formed and the elastic member 8 is housed in the first space 6a in a compressed state. The first region 7f and the side surface 9f form at least a part of the inner wall of the second space 6b. Finally, the molten resin 13 is filled into the second space 6b and the molten resin 13 is cured, thereby joining the first region 7f which is a part of the first member 71 and the side surface 9f which is a part of the second member 91. After the molten resin 13 is cured, the other member 14 is removed.

[0042] Also in the method for joining members of the present embodiment, the same operational effects as those of the method for joining members of the first embodiment are achieved. Further, according to the method for joining members of the present embodiment, compared with the first embodiment, the joint area of the joint portion between the first member 71 and the second member 91 (the sum of the area of the first region 7f and the area of the side surface 9f) can be increased, so that the joint force can be further enhanced. Therefore, the reliability of the joining of the members is further improved. Furthermore, as shown in FIG. 9(b), the outer size of the side surface of the portion including the molten resin 13 and the second member 91 is the same as the outer size of the side surface of the first member 71. In other words, the second member 91 is joined to the first member 71 in accordance with the outer size of the side surface of the first member 71. Thereby, the outer size of the side surface of the liquid supply member 6 can be made constant regardless of the joint portion. Therefore, for example, complication of the attachment structure to the connection portion (opening portion) of the liquid storage container 3 shown in FIG. 1 can be suppressed.

[0043] In the present embodiment, the relationship between the widths of the first member 71 and the second member 91 is set as w21 < w11 and w22 < w12, but it is not limited thereto. If the first member 71 and the second member 91 can be appropriately joined, the relationship of w21 < w11 and w22 = w12, or the relationship of w21 = w11 and w22 < w12 may be used.

[0044] (Third Embodiment) FIG. 10 is a diagram for explaining a method of joining members according to the third embodiment of the present invention. FIGS. 10(a) and 10(b) are process diagrams. In the method of joining members of the present embodiment, as shown in FIG. 10(a), a first member 71, an elastic member 8, a second member 91, and a third member 10 are prepared. Both the first member 71 and the second member 91 are the same as those used in the second embodiment. The size of the outer periphery of the side surface of the third member 10 is substantially the same as the size of the outer periphery of the side surface of the first member 71.

[0045] As shown in FIG. 10(b), the third surface 10a of the third member 10 has a second region 10b that faces the first region 7f of the first surface 7a of the first member 71. With the second surface 9a of the second member 91 in contact with the first surface 7a of the first member 71, the first region 7f is adjacent to the side surface 9f of the second member 91. With the third surface 10a of the third member 10 in contact with the surface on the opposite side of the second surface 9a of the second member 9, the second region 10b is adjacent to the side surface 9f of the second member 91. In the present embodiment, a second space 6b for filling the molten resin 13 is formed using the first region 7f of the first member 71, the side surface 9f of the second member 91, the second region 10b of the third member 10, and another member 14 (for example, a mold). For filling the molten resin 13 into the second space 6b, for example, the third member 10 or another member 14 can be used. In this case, the third member 10 or another member 14 is provided with a flow path communicating with the second space 6b, and the molten resin 13 is filled into the second space 6b using this flow path.

[0046] In the method for joining members of the present embodiment, first, as shown in FIG. 10(a), the elastic member 8 is housed in the first concave portion 7b of the first member 71. Next, as shown in FIG. 10(b), the first member 71, the second member 91, the third member 10, and the other member 14 are assembled so that the first space 6a and the second space 6b are formed and the elastic member 8 is housed in the first space 6a in a compressed state. The first region 7f, the side surface 9f, and the second region 10b form at least a part of the inner wall of the second space 6b. Finally, the molten resin 13 is filled into the second space 6b and the molten resin 13 is cured, thereby joining the first region 7f which is a part of the first member 71, the side surface 9f which is a part of the second member 91, and the second region 10b which is a part of the third member 10. After the molten resin 13 is cured, the other member 14 is removed.

[0047] Also in the method for joining members of the present embodiment, the same operational effects as those of the methods for joining members of the first and second embodiments are achieved. Further, according to the method for joining members of the present embodiment, the following effects can also be obtained as compared with the joining method using ultrasonic welding.

[0048] In the joining method using ultrasonic welding, the first member and the second member are joined by ultrasonic welding, and then the second member and the third member are joined by ultrasonic welding. Thus, it is necessary to perform the ultrasonic welding process twice. On the other hand, according to the method for joining members of the present embodiment, by filling the molten resin 13 into the second space 6b, the first member 71, the second member 91, and the third member 10 can be joined at once. Therefore, the number of joining steps can be reduced as compared with the joining method using ultrasonic welding.

[0049] In any of the methods for joining members of the first to third embodiments described above, injection molding can be applied. FIG. 11 is a schematic diagram showing an example of an injection molding machine. As shown in FIG. 11, the injection molding machine has a first mold 21 on the fixed side and a second mold 22 on the movable side. The first mold 21 and the second mold 22 are arranged to face each other. An injection nozzle 23 for injecting molten resin is attached to the second mold 22. The molten resin injected by the injection nozzle 23 is supplied to three cavities 22a to 22c through the flow path inside the second mold 22. A valve for controlling the inflow of molten resin is provided in each of the cavities 22a to 22c. For example, by adopting a hot runner system, it is possible to easily switch the supply of molten resin to the cavities 22a to 22c only by switching the valve.

[0050] Cavity 22a is used to form the first member 7 (71). Cavity 22b is used to form the second member 9 (91). Cavity 22c is used to assemble and join the second member 9 (91) to the first member 7 (71). Although not shown in FIG. 11, a mechanism for moving the second mold 22, a mechanism for moving the molded product in the mold, etc. are also provided. Using these mechanisms, the first member 7 (71) and the second member 9 (91) can be formed in the mold, and the second member 9 (91) can be assembled and joined to the first member 7 (71). Note that as the moving mechanism, in addition to a slide mechanism for sliding the member, a robot for moving the molded product, etc. may be used. Also, a rotating table may be used to move a plurality of molds. Further, an intermediate mold may be provided and the intermediate mold may be rotated to move the molded product to the position where the molten resin is poured.

[0051] FIG. 12 is a schematic diagram showing another example of an injection molding machine. The injection molding machine shown in FIG. 12 has the same configuration as the injection molding machine shown in FIG. 11, except that it has two injection nozzles 23a and 23b. The injection nozzle 23a communicates with each of the cavities 22a and 22b through a flow path. The injection nozzle 23b communicates with the cavity 22c through a flow path. The material of the molten resin used to join the first member 7 (71) and the second member 9 (91) is different from the material of the molten resin used to form the first member 7 (71) and the second member 9 (91).

[0052] The joining method of the members of the first or second embodiment can be implemented using the injection molding machine shown in FIG. 11 or FIG. 12. Further, by providing a cavity for forming a third member 10 in the second mold 22, the joining method of the members of the third embodiment can be implemented. When further increasing the number of members formed by injection molding, it is possible to cope by adding cavities for each member.

[0053] FIG. 13 is a diagram for explaining the procedure when implementing the joining method of the members of the first embodiment using the above injection molding machine. FIGS. 13(a) to 13(f) are process diagrams. First, as shown in FIGS. 13(a) and 13(b), the first member 7 is formed in the first mold 21, and the second member 9 is formed in the second mold 22. This step includes providing a first recess 7b and a second recess 7d on the first surface 7a, and providing a contact portion (first convex portion) 9b and a second convex portion 9d on the second surface 9a.

[0054] Next, as shown in FIG. 13(c), the elastic member 8 is accommodated in the first recess 7b of the first member 7. Next, as shown in FIGS. 13(d) and 13(e), the second mold 22 is moved relative to the first mold 21 to assemble the second member 9 to the first member 7. This step includes forming the first space 6a with the abutting portion (first convex portion) 9b and the first concave portion 7b, and accommodating the elastic member 8 in a compressed state in the first space 6a, and fitting the edge of the second concave portion 7b and the edge of the tip of the second convex portion 9d to form the second space 6b.

[0055] Finally, as shown in FIG. 13(f), the second space 6b is filled with molten resin to join the first member 7 and the second member 9. This joining step is performed in the cavity 22c shown in FIG. 11 or FIG. 12. The second member 9 is provided with a flow path 20 communicating with the second space 6b, and it is possible to pour molten resin into the second space 6b from the opening end of this flow path 20 (the opening of the second space 6b). In the cavity 22c, the opening end of the flow path 20 communicates with the supply port of the molten resin of the second mold. Thereby, the molten resin injected from the injection nozzle 23(23b) can be poured into the second space 6b. After joining, the mold is opened and the molded product is taken out.

[0056] The method of joining the members of the second embodiment can also be basically carried out according to the steps shown in FIGS. 13(a) to 13(f). In the steps of FIGS. 13(a) and 13(b), the first member 7 is formed on the first mold 21, and the second member 9 is formed on the second mold 22. A concave portion (first concave portion) 7b is provided on the first surface 7a, and an abutting portion 9b that abuts against the elastic member 8 is provided on the second surface 9a. In the step of FIG. 13(c), the elastic member 8 is accommodated in the concave portion (first concave portion) 7b of the first member 7.

[0057] In the steps of FIGS. 13(d) and 13(e), the second mold 22 is moved relative to the first mold 21 to assemble the second member 9 to the first member 7. The first space 6a is formed by the concave portion (first concave portion) 7b and the abutting portion 9b, and the elastic member 8 is accommodated in a compressed state in this first space 6a. In the step of Fig. 13(f), a second space 6b is formed by a first region 7f surrounding a recess (first recess) 7b in the first surface 7a, a side surface 9f of the second member 9, and a part of the second mold 22. The second space 6b is filled with molten resin to join the first member 7 and the second member 9.

[0058] The method for joining members of the third embodiment can also be basically carried out according to the steps shown in Figs. 13(a) to 13(f). In the steps of Figs. 13(a) and 13(b), a first member 7 is formed in a first mold 21, and a second member 9 and a third member 10 are formed in a second mold 22. A recess (first recess) 7b is provided in the first surface 7a, and a contact portion 9b that contacts the elastic member 8 is provided in the second surface 9a. In the step of Fig. 13(c), the elastic member 8 is accommodated in the recess (first recess) 7b of the first member 7.

[0059] In the steps of Figs. 13(d) and 13(e), the second mold 22 is moved to assemble the second member 9 and the third member 10 to the first member 7. A first space 6a is formed by the recess (first recess) 7b and the contact portion 9b, and the elastic member 8 is accommodated in this first space 6a in a compressed state. In the step of Fig. 13(f), a second space 6b is formed by a first region 7f surrounding a recess (first recess) 7b in the first surface 7a, a side surface 9f of the second member 9, a second region 10b (see Fig. 10) of the third member 10, and a part of the second mold 22. The second space 6b is filled with molten resin to join the first member 7, the second member 9, and the third member 10.

[0060] According to the method for joining members using the injection molding described above, the steps from the formation to the joining of the members can be carried out in an injection molding machine. Therefore, compared with the existing method of positioning and welding the injection-molded members with a welding machine, the equipment cost can be significantly reduced. Also, when compressing the elastic member 8, the clamping force of the injection molding machine can be utilized. Since the clamping force is much stronger than the pressurization of the welding machine, more stable compression of the elastic member 8 is possible.

[0061] In the above-described method for joining members using injection molding, the elastic member 8 is not formed by an injection molding machine. If a slit 8a is later formed in the elastic member 8, the molded product may be damaged. Therefore, when it is possible to injection-mold the elastic member 8 provided with the slit 8a, it is preferable to also mold the elastic member 8 with an injection molding machine.

[0062] The disclosure of this embodiment includes the following methods and configurations. (Method 1) A method for joining a plurality of members to each other, comprising: assembling the first member, the second member, and the elastic member such that a first space and a second space separated from the first space are formed adjacent to the first member and the second member, and the elastic member is accommodated in a compressed state in the first space; filling the second space with a first molten resin to join the first member and the second member. (Method 2) The method for joining members according to Method 1, wherein a part of the first member and a part of the second member form an inner wall of the second space. (Method 3) The first member has a first surface, and the first surface is provided with a first recess for accommodating the elastic member. The second member has a second surface, and the second surface is provided with a contact portion that faces the first recess and contacts the elastic member. The method for joining members according to Method 1 or 2, wherein the contact portion and the first recess form the first space. (Method 4) The method for joining members according to Method 3, wherein the contact portion is convex, and the first space is formed by fitting an edge portion of a tip of the contact portion and an edge portion of the first recess. (Method 5) The first member is provided with a second recess surrounding the first recess on the first surface. The second member includes a convex portion that faces the second concave portion and surrounds the contact portion on the second surface. The method for joining members according to method 3 or 4, wherein the second space is formed by fitting an edge portion of the second concave portion and an edge portion of a tip of the convex portion. (Method 6) The method for joining members according to method 5, wherein the second concave portion is groove-shaped and a cross-sectional shape in a width direction of a bottom surface of the second concave portion is a curved surface. (Method 7) The first surface of the first member includes a first region that surrounds the first concave portion. The second member has a side surface adjacent to the second surface. The method for joining members according to method 3 or 4, wherein the first region and the side surface form a part of an inner wall of the second space. (Method 8) The method for joining members according to method 7, wherein a size of an outer periphery of the side surface of the second member is smaller than a size of an outer periphery of the side surface of the first member. (Method 9) A step of assembling the third member to the second member so that a third space separated from the first space is formed adjacent to the third member and the second member; The method for joining members according to any one of methods 1 to 8, further including a step of filling the third space with a second molten resin to join the third member and the second member. (Method 10) The method for joining members according to method 2, wherein the third member, the first member, and the second member are assembled so that a part of the third member forms a part of an inner wall of the second space together with a part of the first member and a part of the second member, and the first molten resin is filled into the second space to join the third member, the first member, and the second member. (Method 11) The method for joining members according to any one of methods 1 to 10, wherein the first molten resin does not contact the elastic member. (Method 12) The method for joining members according to any one of Methods 1 to 11, wherein the plurality of members are formed by injection molding. (Method 13) The method for joining members according to Method 12, wherein the elastic member is compressed by mold clamping. (Method 14) The method for joining members according to Method 12 or 13, wherein the material of the first molten resin is different from the material of the molten resin for injection molding the plurality of members. (Method 15) A method for joining members, comprising forming and joining members using a first mold and a second mold, A step of forming a first member in the first mold and a second member in the second mold, wherein when the second member is assembled to the first member, a first space and a second space separated from the first space are formed adjacent to the first member and the second member, including forming the first member and the second member; A step of relatively moving the second mold with respect to the first mold to assemble the second member to the first member, including forming the first space and the second space, and accommodating an elastic member in a compressed state in the first space; A step of filling the second space with molten resin to join the first member and the second member. (Method 16) The method for joining members according to Method 15, wherein a part of the first member and a part of the second member form at least a part of the second space. (Method 17) The method for joining members according to Method 15, wherein the second member is provided with a flow path communicating with the second space, and the molten resin flows into the second space through the flow path. (Configuration 1) An assembly of members in which a plurality of members are joined to each other, It has a first member and a second member, and a first space and a second space separated from the first space are formed adjacent to the first member and the second member. An elastic member is accommodated in the first space in a compressed state. The second space is a sealed space filled with a resin, and the first member and the second member are joined by the resin. An assembly of members. (Configuration 2) The second member is in communication with the second space and includes a flow path for filling the second space with molten resin. The assembly of members according to Configuration 1. (Configuration 3) An assembly of members in which a plurality of members are joined to each other, having a first member having a first surface and a second member having a second surface, the outer periphery of the side surface being smaller than that of the first member, The first member has a recess on the first surface for accommodating an elastic member. The second member has a contact portion on the second surface that faces the recess and contacts the elastic member. The elastic member is accommodated in a compressed state in the space formed by the contact portion and the recess. An assembly of members having a joining portion made of resin that joins the region surrounding the recess on the first surface and the side surface of the second member.

Explanation of Reference Numerals

[0063] 6a First space 6b Second space 7 First member 8 Elastic member 9 Second member

Claims

1. A method for joining a plurality of members to each other, comprising the steps of: assembling the first member, the second member, and the elastic member such that a first space is formed adjacent to the first member and a second space is formed apart from the first space, and the elastic member is accommodated in the first space in a compressed state; and filling the second space with a first molten resin to join the first member and the second member.

2. The method for joining members according to claim 1 , wherein a portion of the first member and a portion of the second member form an inner wall of the second space.

3. the first member has a first surface, and the first surface is provided with a first recess for receiving the elastic member; the second member has a second surface, the second surface including a contact portion that faces the first recess and contacts the elastic member; The method for joining members according to claim 1 , wherein the abutting portion and the first recess form the first space.

4. The method for joining members according to claim 3 , wherein the contact portion is convex, and the first space is formed by fitting an edge portion of a tip of the contact portion into an edge portion of the first recess.

5. the first member includes a second recess on the first surface, the second recess surrounding the first recess; the second member includes a protrusion on the second surface, the protrusion facing the second recess and surrounding the contact portion; The method for joining members according to claim 3 , wherein the second space is formed by fitting an edge of the second recess into an edge of the tip of the protrusion.

6. The method for joining members according to claim 5 , wherein the second recess is groove-shaped, and a cross-sectional shape in the width direction of a bottom surface of the second recess is curved.

7. the first surface of the first member includes a first region surrounding the first recess; the second member has a side surface adjacent to the second surface; The method for joining members according to claim 3 , wherein the first region and the side surface form a part of an inner wall of the second space.

8. The method for joining members according to claim 7 , wherein a size of an outer periphery of the side surface of the second member is smaller than a size of an outer periphery of the side surface of the first member.

9. assembling the third member to the second member such that a third space is formed adjacent to the third member and the second member; The method for joining members according to claim 1 , further comprising the step of filling the third space with a second molten resin to join the third member and the second member together.

10. 3. The method for joining members according to claim 2, further comprising assembling the third member with the first member and the second member so that a portion of the third member forms a portion of an inner wall of the second space together with a portion of the first member and a portion of the second member, and filling the second space with the first molten resin to join the third member with the first member and the second member.

11. The method for joining members according to claim 1 , wherein the first molten resin does not come into contact with the elastic member.

12. The method for joining members according to claim 1 , wherein the plurality of members are formed by injection molding.

13. The method for joining members according to claim 12 , wherein the elastic member is compressed by clamping.

14. The method for joining members according to claim 12 , wherein a material of the first molten resin is different from a material of the molten resin used for injection molding the plurality of members.

15. A method for joining members, comprising forming and joining members using a first mold and a second mold, the method comprising the steps of: a step of forming a first member in the first mold and a second member in the second mold, the step including forming the first member and the second member such that, when the second member is assembled to the first member, a first space is formed adjacent to the first member and the second member and a second space is formed apart from the first space; a step of assembling the second member to the first member by moving the second mold relative to the first mold, the step including forming the first space and the second space and accommodating an elastic member in a compressed state in the first space; and filling the second space with molten resin to join the first member and the second member.

16. The method for joining members according to claim 15 , wherein a portion of the first member and a portion of the second member form at least a portion of the second space.

17. The method for joining members according to claim 15 , wherein the second member is provided with a flow path communicating with the second space, and the molten resin flows into the second space via the flow path.

18. An assembly of members in which a plurality of members are joined together, An assembly of members comprising a first member and a second member, a first space formed adjacent to the first member and the second member and a second space separated from the first space, an elastic member housed in a compressed state in the first space, the second space being a sealed space filled with resin, and the first member and the second member being joined by the resin.

19. 20. The assembly of members according to claim 18, wherein the second member is provided with a flow path communicating with the second space for filling the second space with molten resin.

20. An assembly of members in which a plurality of members are joined together, A first member having a first surface, and a second member having a second surface and a side surface having a smaller outer periphery than the first member, the first member has a recess in the first surface for accommodating an elastic member; the second member has, on the second surface, a contact portion that faces the recess and contacts the elastic member; The elastic member is accommodated in a compressed state in a space formed by the contact portion and the recessed portion, An assembly of members, comprising a joint made of resin that joins a region of the first surface surrounding the recess and the side surface of the second member.

Images