Flow path connection mechanism and ink jet recording apparatus

Abstract

The invention provides a flow path connection mechanism and an ink jet recording apparatus. The first coupling member has a first valve mechanism having a first valve housing, a hollow movable valve, a first urging member, and a strut, the second coupling member has a second valve mechanism having a second valve housing, a movable valve, and a second urging member, and in a connected state in which the first coupling member and the second coupling member are connected, the first urging member and the second urging member engage with each other. The hollow movable valve is displaced in a direction against the biasing force of the first biasing member by pressing the hollow movable valve by the second valve housing, and the movable valve is displaced in a direction against the biasing force of the second biasing member by pressing the movable valve by the pillar, one of the pillar and the movable valve has a valve convex portion, and the other has a valve concave portion. In the connected state, the valve convex part is embedded in the valve concave part.

Description

Technical Field

[0001] The present invention relates to a flow channel connecting mechanism for circulating liquid and an inkjet recording device. Background Art

[0002] The inkjet recording device uses ink as a liquid. In other words, the inkjet recording device circulates the ink within the device.

[0003] To facilitate ink circulation, an inkjet recording device includes a flow channel connection mechanism, which includes, for example, a coupling component connected to a tube. The flow channel connection mechanism includes, for example, a pair of coupled coupling components. Each of the pair of coupling components internally includes a force-applying component that exerts a force in a direction that separates the coupling components. With this structure, connecting the pair of coupling components requires pressing the coupling components in a direction that overcomes the force of the force-applying component. Therefore, if the force of the force-applying component is large, the workability of connecting the coupling components is poor. Summary of the Invention

[0004] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a flow path connection mechanism and an inkjet recording apparatus capable of improving the workability of connecting a coupling member.

[0005] In order to solve the above-mentioned problems, the flow channel connection mechanism of the first aspect of the present invention includes: a first connecting member, which is a cylindrical body with an axis extending in a predetermined direction as the central axis, and has a liquid flow path inside; and a second connecting member, which is a cylindrical body with the central axis as the center, connected to the first connecting member in the axial direction, has a liquid flow path inside, and allows the liquid to circulate in the axial direction together with the first connecting member. The first connecting member has a first valve mechanism on the radial inside. The second connecting member has a second valve mechanism on the radial inside. The first valve mechanism includes: a cylindrical first valve housing with the central axis as the center; a cylindrical hollow movable valve arranged radially inside the first valve housing, centered on the central axis; a first force applying member arranged radially inside the first valve housing, which applies force to the hollow movable valve toward the side connected to the second connecting member; and a support arranged radially inside the first valve housing so as to penetrate the hollow movable valve in the axial direction. The second valve mechanism comprises: a cylindrical second valve housing centered on a central axis; a columnar movable valve disposed radially inwardly of the second valve housing, centered on the central axis; and a second biasing member disposed radially inwardly of the second valve housing for biasing the movable valve toward the side connected to the first coupling member. When the first coupling member and the second coupling member are connected, the second valve housing is inserted into the interior of the first valve housing. The second valve housing presses the hollow movable valve, displacing it in a direction that overcomes the force of the first biasing member. Furthermore, the support presses the movable valve, displacing it in a direction that overcomes the force of the second biasing member. This allows liquid to flow between the first coupling member and the second coupling member. One of the support and the movable valve has an axially projecting valve protrusion, and the other has a valve recess into which the valve protrusion fits. In the connected state, the valve protrusion fits into the valve recess.

[0006] An inkjet recording device according to a second aspect of the present invention includes the above-described flow path connection mechanism, wherein the liquid is ink and printing is performed using the ink.

[0007] According to the structure of this invention, the workability of the connection operation of a coupling member can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of an inkjet recording apparatus according to one embodiment. Figure 2 This is a plan view of a recording unit of an inkjet recording apparatus according to one embodiment. Figure 3 It is a perspective view of a flow channel connecting mechanism according to an embodiment. Figure 4 This is a perspective view of a state in which the connection between the first coupling member and the second coupling member is released according to one embodiment. Figure 5 It is a cross-sectional view of a flow channel connecting mechanism according to an embodiment. Figure 6 This is an exploded perspective view of a first coupling member according to one embodiment. Figure 7 This is a cross-sectional view of a first coupling member according to one embodiment. Figure 8 This is an exploded perspective view of a second coupling member according to one embodiment. Figure 9 This is a cross-sectional view of a second coupling member according to one embodiment. Figure 10 This is a perspective view of a connecting member according to one embodiment. Figure 11 This is a perspective view showing the positional relationship between the connecting protrusion and the guide groove when the first coupling member is inserted into the inner side of the connecting member according to one embodiment. Figure 12 It is a plan view showing the positional relationship and dimensional relationship between the connecting protrusion and the connecting hole according to one embodiment. Figure 13 This is a cross-sectional view showing a state at the moment when the first coupling member and the second coupling member are separated according to one embodiment. Figure 14 This is a perspective view of a first valve housing according to one embodiment. Figure 15 It is a perspective view of the first valve housing of the first modified example. Figure 16 It is a perspective view of the first valve housing of the second modified example. Figure 17A These are diagrams for explaining the positional relationship between the connecting protrusion and the connecting hole when the first connecting member and the second connecting member are connected and disconnected according to one embodiment. Figure 17B These are diagrams for explaining the positional relationship between the connecting protrusion and the connecting hole when the first and second connecting members of the embodiment are connected and disconnected. Figure 17C These are diagrams for explaining the positional relationship between the connecting protrusion and the connecting hole when the first connecting member and the second connecting member are connected and disconnected according to one embodiment. Figure 18 This is a perspective view of the concavo-convex portion and the surrounding areas of each of the first and second coupling members according to one embodiment. Figure 19A This is a diagram for explaining the positional relationship between the concavo-convex portions of the first and second coupling members according to one embodiment. Figure 19B This is a diagram for explaining the positional relationship between the concavo-convex portions of the first and second coupling members according to one embodiment. Figure 20 This is an enlarged plan view of a concavo-convex portion according to one embodiment. Figure 21 This is a plan view of a connecting member according to one embodiment as viewed from the axial direction. Figure 22 This is an enlarged view of a protrusion of a connecting member according to one embodiment. Figure 23A This is a diagram for explaining circumferential play between a connecting protrusion and a guide groove according to one embodiment. Figure 23B This is a diagram for explaining circumferential play between a connecting protrusion and a guide groove according to one embodiment. Figure 24A This is a diagram for explaining circumferential play between an engaging region of a connecting protrusion and a connecting hole according to one embodiment. Figure 24B This is a diagram for explaining circumferential play between an engaging region of a connecting protrusion and a connecting hole according to one embodiment. DETAILED DESCRIPTION

[0009] <Structure of Inkjet Recording Apparatus> like Figure 1 As shown, the inkjet recording device 500 of this embodiment is an inkjet printer and includes a device body 510 , a paper supply unit 520 , a paper conveying unit 530 , a recording unit 540 , a drying unit 550 , a paper discharge unit 560 , and a control unit 570 .

[0010] The paper supply unit 520 accommodates paper P, which serves as a recording medium. The paper supply unit 520 delivers the paper P one sheet at a time. The paper conveying unit 530 conveys the paper P delivered from the paper supply unit 520. The paper P passes through the recording unit 540 and the drying unit 550 in sequence. Recording (in other words, image formation) is performed on the paper P in the recording unit 540. The image (i.e., ink) recorded on the paper P is dried in the drying unit 550. The paper conveying unit 530 then discharges the paper P to the paper discharge unit 560.

[0011] The paper conveying unit 530 includes a first belt conveying unit 531 and a second belt conveying unit 532. Each of the first and second belt conveying units 531 and 532 includes an endless belt stretched and arranged for circumferential rotation. The first and second belt conveying units 531 and 532 each hold the paper P by suction on its outer circumferential surface. The belts rotate in this state, thereby conveying the paper P.

[0012] In the case of double-sided printing, after printing on one side of the paper, the paper conveying unit 530 uses the branching unit 533 to distribute the paper P to the reversing conveying unit 534. The reversing conveying unit 534 switches the paper P back, returning it to the upstream side of the printing unit 540 in the paper conveying direction. This reverses the front and back sides of the paper P. The paper conveying unit 530 then conveys the reversed paper P again.

[0013] The recording unit 540 is located above the first belt transport unit 531 and faces the paper P transported by the first belt transport unit 531 (specifically, the belt) with a predetermined gap therebetween. The recording unit 540 includes a line inkjet recording head 541 .

[0014] like Figure 2 As shown, the recording head 541 includes recording heads 541B, 541C, 541M, and 541Y corresponding to the four colors of black, cyan, magenta, and yellow, respectively. There are multiple (e.g., three) recording heads 541B, 541C, 541M, and 541Y. The three recording heads 541 for each color are arranged alternately in the paper width direction Dw, which is perpendicular to the paper conveyance direction Dc.

[0015] The recording head 541 includes a plurality of ink nozzles 542 arranged in the paper width direction Dw. The recording unit 540 ejects ink from the recording heads 541B, 541C, 541M, and 541Y onto the paper P transported by the first belt transport unit 531. This records an image on the paper P.

[0016] In addition, if Figure 1 As shown, the drying unit 550 is arranged downstream of the recording unit 540 in the paper conveying direction. The second belt conveyor 532 conveys the paper P at the drying unit 550. The drying unit 550 dries the ink attached to the paper P while the second belt conveyor 532 is conveying the paper P.

[0017] Although not shown, the control unit 570 includes various electronic components, such as a processing circuit (e.g., a CPU) and memory (e.g., ROM and RAM). Based on a control program and control data, the control unit 570 controls the operation of each component included in the inkjet recording device 500. The paper supply unit 520, paper conveying unit 530, recording unit 540, and drying unit 550 each receive instructions from the control unit 570 and work in conjunction to record on paper P.

[0018] The inkjet recording device 500 also includes an ink supply unit 580. The ink supply unit 580 holds an ink container (not shown). The ink container contains ink. The ink supply unit 580 supplies ink from the ink container to the device body 510. The ink is supplied to the recording unit 540. The recording head 541 ejects the ink supplied from the ink container.

[0019] Here, in order to supply ink from the ink supply unit 580 to the apparatus main body 510, a tube TU (see Figure 5 ). Ink is supplied from the ink supply unit 580 to the apparatus main body 510 via the tube TU. In other words, the tube TU allows ink to circulate.

[0020] The tube TU is divided in the middle. The flow channel connection mechanism 1000 (see Figures 3 to 5 The flow channel connection mechanism 1000 connects the divided parts of the tube TU, allowing the ink to flow through the divided parts of the tube TU. In this structure, the ink is equivalent to "liquid".

[0021] <Structure of flow channel connection mechanism> The inkjet recording device 500 includes Figures 3 to 5 The flow path connection mechanism 1000 shown in FIG. The flow path connection mechanism 1000 includes a first connection member 1 and a second connection member 2 .

[0022] The first and second coupling members 1 and 2 are each cylindrical bodies having an axis extending in a predetermined direction as the central axis CA. In the following description, the direction in which the central axis CA extends (i.e., the direction corresponding to the "predetermined direction") is referred to as the "axial direction," the circumferential direction centered on the central axis CA is referred to as the "circumferential direction," and the direction orthogonal to the central axis CA is referred to as the "radial direction." Within the radial direction, directions approaching the central axis CA are referred to as the "radially inward direction," and directions away from the central axis CA are referred to as the "radially outward direction."

[0023] The first and second coupling members 1 and 2 are each connected to the tube TU. The interior of the tube TU (i.e., the interior of the tubular body) serves as an ink flow path, allowing the ink to circulate in the axial direction. Specifically, the first and second coupling members 1 and 2 are tubular bodies with the ink's flow direction as their axial direction.

[0024] The first coupling member 1 and the second coupling member 2 are axially connectable. By connecting the first coupling member 1 and the second coupling member 2, the flow paths of the first coupling member 1 and the second coupling member 2 are axially connected, allowing ink to circulate in the axial direction. Furthermore, the connection between the first coupling member 1 and the second coupling member 2 can be disconnected.

[0025] Figure 3 It shows a state where the first coupling member 1 and the second coupling member 2 are connected. Figure 4 This shows a state in which the connection between the first coupling member 1 and the second coupling member 2 is released. Figure 5 It is a cross-sectional view showing a state in which the first coupling member 1 and the second coupling member 2 are connected. Figure 5 The cross section shown corresponds to a cross section taken along a plane including the central axis CA.

[0026] <Structure of the First Connecting Member> like Figure 6 As shown, the first coupling member 1 includes a first member 11 and a second member 12. The first member 11 and the second member 12 are fixed to each other. By fixing the first member 11 and the second member 12 to each other, the first member 11 and the second member 12 are connected to each other in the axial direction. Figure 7 2 is a cross-sectional view showing a state in which the first member 11 and the second member 12 are fixed to each other (a cross-sectional view of a single body of the first coupling member 1 ). Figure 7 The cross section shown corresponds to a cross section taken along a plane including the central axis CA.

[0027] Tube TU is connected to the first component 11. The second coupling component 2 (i.e., another coupling component) is connected to the second component 12. In the following description, of the two axial sides of the first coupling component 1, the side connected to tube TU is referred to as the first axial side of the first coupling component 1, and the side connected to the second coupling component 2 is referred to as the other axial side of the first coupling component 1. Furthermore, within the first coupling component 1, ink can flow from one axial side to the other, and from the other axial side to the first axial side.

[0028] The first component 11 has a tube connection portion 111. The tube connection portion 111 is cylindrical and centered on the central axis CA. The tube connection portion 111 is located on one side of the first component 11 in the axial direction. The tube TU is connected to the first component 11 by inserting the tube TU through the tube connection portion 111.

[0029] Furthermore, the first member 11 has an outer fitting portion 110. The outer fitting portion 110 is disposed on the other axial side of the first member 11. The outer fitting portion 110 has a cylindrical shape centered on the central axis CA.

[0030] The second member 12 has a cylindrical shape centered on the central axis CA. Ink flows inside the second member 12 .

[0031] The second component 12 holds the first valve mechanism V1 within it. Specifically, the first coupling component 1 includes the first valve mechanism V1 radially inward. The first valve mechanism V1 is arranged radially inward of the second component 12. The first valve mechanism V1 includes a hollow movable valve 101, a compression coil spring 102, and a support column 103. Both the hollow movable valve 101 and the support column 103 are resin molded products. The compression coil spring 102 serves as the "first biasing member."

[0032] The first valve mechanism V1 includes a first valve housing. The second member 12 corresponds to the "first valve housing." That is, the first valve housing has a cylindrical shape centered on the central axis CA.

[0033] The hollow movable valve 101 is disposed radially inward of the second member 12. The hollow movable valve 101 is cylindrical centered on the central axis CA. Ink flows axially through the hollow movable valve 101. In other words, ink flows through the second member 12.

[0034] The hollow movable valve 101 has a sealing portion 1011 on its outer circumferential surface. The sealing portion 1011 is provided with a sealing member Or. The sealing member Or of the sealing portion 1011 is an O-ring formed from an elastomer such as rubber. The sealing member Or is embedded in the outer circumferential surface of the hollow movable valve 101, forming the sealing portion 1011. The outer circumference of the sealing member Or of the sealing portion 1011 is in close contact with the inner circumferential surface of the second component 12. This restricts the axial flow of ink radially outward from the hollow movable valve 101.

[0035] The compression coil spring 102 is positioned radially inward of the second member 12. The compression coil spring 102 generates an axial biasing force. This biases the hollow movable valve 101 toward the other axial direction. In other words, the compression coil spring 102 biases the hollow movable valve 101 toward the side connected to the second coupling member 2.

[0036] However, in the disconnected state ( Figure 7 In the state shown in FIG, the hollow movable valve 101 is restricted from moving to the other side in the axial direction. Therefore, the hollow movable valve 101 will not fall off from the radial inner side of the second component 12 to the outside of the second component 12.

[0037] Furthermore, the compression coil spring 102 urges the first component 11 toward one side in the axial direction. Specifically, the compression coil spring 102 urges the first component 11 away from the second component 12. However, the first component 11 and the second component 12 are fixed to each other. Therefore, the first component 11 does not separate from the second component 12.

[0038] The support column 103 extends axially. The support column 103 is arranged radially inward of the second component 12 so as to axially penetrate the hollow movable valve 101. In other words, the support column 103 is arranged radially inward of the hollow movable valve 101. Furthermore, the support column 103 axially penetrates the compression coil spring 102 radially inward of the second component 12. The support column 103 does not displace axially relative to the second component 12.

[0039] The support column 103 has a first seal portion 100 on its outer circumferential surface. Specifically, the first coupling member 1 has the first seal portion 100 radially inward. The first seal portion 100 is the portion of the support column 103 where an annular seal Or is mounted. In the following description, the seal Or mounted on the support column 103 is referred to as the first seal Or1. Furthermore, the support column 103 has an annular first seal groove (reference numeral omitted) extending continuously in the circumferential direction. The first seal Or1 is disposed in this first seal groove.

[0040] The first seal member Or1 is an O-ring formed from an elastic material such as rubber. The first seal member Or1 is embedded in the outer circumference of the support 103, forming the first seal portion 100. The outer circumference of the first seal member Or1 is capable of close contact with the inner circumference of the hollow movable valve 101. In other words, the first seal portion 100 is capable of close contact with the inner circumference of the hollow movable valve 101 (specifically, the first protrusion 1012 described below).

[0041] The first sealing portion 100 restricts the flow of ink inside the second member 12 by closely contacting the inner peripheral surface of the hollow movable valve 101. That is, the first sealing portion 100 restricts the flow of ink inside the first coupling member 1.

[0042] The hollow movable valve 101 has a first protrusion 1012 on its inner circumferential surface that protrudes radially inward, serving as a portion that closely contacts the first sealing portion 100. The first protrusion 1012 extends continuously in the circumferential direction, forming a ring-shaped projection. In other words, the first protrusion 1012 is a circumferentially annular protrusion. The first protrusion 1012 has an inner diameter smaller than that of the rest of the hollow movable valve 101.

[0043] The second member 12 also includes an inner fitting portion 120. The inner fitting portion 120 is disposed on one axial side of the second member 12. Specifically, the inner fitting portion 120 is formed on one axial side of the cylindrical body of the second member 12.

[0044] The outer fitting portion 110 of the first component 11 and the inner fitting portion 120 of the second component 12 are fitted together. Specifically, the inner fitting portion 120 fits inside the outer fitting portion 110. In other words, the inner fitting portion 120 is inserted inside the outer fitting portion 110. In this state, at least a portion of the inner circumferential surface 1100 of the outer fitting portion 110 and the outer circumferential surface 1200 of the inner fitting portion 120 are in contact with each other.

[0045] The first component 11 and the second component 12 are fixed to each other with the outer fitting portion 110 and the inner fitting portion 120 interlocked. Laser welding is used to secure the first and second components 111 and 12. Specifically, while the outer fitting portion 110 and the inner fitting portion 120 are interlocked, laser light is irradiated from the radially outer side of the outer fitting portion 110 onto the interlocking portion between the outer fitting portion 110 and the inner fitting portion 120. As a result, the respective resins are welded together at the interface between the outer fitting portion 110 and the inner fitting portion 120. In other words, the first component 11 and the second component 12 are secured to each other at their interlocking portion.

[0046] In the first coupling component 1 of this embodiment, to precisely secure the first component 11 and the second component 12, the inner circumferential surface 1100 of the outer fitting portion 110 and the outer circumferential surface 1200 of the inner fitting portion 120 are each tapered, expanding from one axial side toward the other in a direction away from the central axis CA. In other words, the inner diameter of the outer fitting portion 110 gradually increases from one axial side toward the other, while the outer diameter of the inner fitting portion 120 gradually increases from one axial side toward the other.

[0047] With this structure, the radial gap between the inner circumferential surface 1100 of the outer fitting portion 110 and the outer circumferential surface 1200 of the inner fitting portion 120 can be minimized. This reduced gap suppresses looseness between the first component 11 and the second component 12. Furthermore, the coaxiality between the first component 11 and the second component 12 is improved. This allows for precise fixing of the first component 11 and the second component 12. Consequently, ink leakage from the connection between the first component 11 and the second component 12 can be suppressed. In other words, liquid leakage from the first connecting component 1 can be suppressed.

[0048] Furthermore, the radial gap between the inner circumferential surface 1100 of the outer fitting portion 110 and the outer circumferential surface 1200 of the inner fitting portion 120 (hereinafter referred to as the gap) is 0.1 mm or less. This allows the first component 11 and the second component 12 to be fixed with greater precision.

[0049] Here, in a structure where the inner fitting portion 120 is fitted inside the outer fitting portion 110 , the dimensions of the components need to be set so that the inner diameter of the outer fitting portion 110 is larger than the outer diameter of the inner fitting portion 120 .

[0050] Assuming that neither the inner circumferential surface 1100 of the outer fitting portion 110 nor the outer circumferential surface 1200 of the inner fitting portion 120 is tapered, if the clearance is too small, inserting the inner fitting portion 120 into the inner side of the outer fitting portion 110 becomes difficult. Therefore, the dimensions of each component are set to take into account the operability of the insertion operation when the inner diameter of the outer fitting portion 110 is at the minimum value of the tolerance range and the outer diameter of the inner fitting portion 120 is at the maximum value of the tolerance range. For example, when the tolerance is 0.03mm, the inner diameter of the outer fitting portion 110 is set to 10.04mm, and the outer diameter of the inner fitting portion 120 is set to 9.96mm. In this case, since the maximum inner diameter of the outer fitting portion 110 is 10.07mm and the minimum outer diameter of the inner fitting portion 120 is 9.93mm, the maximum clearance is 0.14mm.

[0051] On the other hand, when both the inner circumferential surface 1100 of the outer fitting portion 110 and the outer circumferential surface 1200 of the inner fitting portion 120 are tapered (as in this embodiment), even with a small clearance, it is possible to prevent the fitting of the inner fitting portion 120 into the inner side of the outer fitting portion 110 from becoming difficult. Therefore, for example, if the tolerance is 0.03 mm, the inner diameter of the outer fitting portion 110 is set to 10.01 mm, and the outer diameter of the inner fitting portion 120 is set to 9.98 mm. In this case, since the maximum inner diameter of the outer fitting portion 110 is 10.04 mm and the minimum outer diameter of the inner fitting portion 120 is 9.95 mm, the maximum clearance is 0.09 mm (i.e., less than 0.1 mm).

[0052] Furthermore, in the first coupling member 1 of this embodiment, the light absorption rate of the outer fitting portion 110 is lower than the light absorption rate of the inner fitting portion 120. Furthermore, the outer fitting portion 110 is part of the first member 11, and the inner fitting portion 120 is part of the second member 12. In other words, the light absorption rates of the materials constituting the first member 11 and the second member 12 are different from each other.

[0053] Because the optical absorption rate of the outer fitting portion 110 is lower than that of the inner fitting portion 120, when laser light is irradiated from the radially outer side of the outer fitting portion 110, the laser light efficiently transmits through the outer fitting portion 110 and is absorbed by the inner fitting portion 120. This allows the first component 11 and the second component 12 to be fixed together by laser welding. As a result, although the first component 11 and the second component 12 are separate components, the first coupling component 1 composed of the first component 11 and the second component 12 can be easily obtained.

[0054] When laser welding is used, compared to using two-color molding to manufacture the first connecting member 1 composed of the first member 11 and the second member 12, it is possible to achieve cost reduction in manufacturing the first connecting member 1 (i.e., it is possible to reduce parts costs). Furthermore, when laser welding is used, since adhesives are not required for securing the first and second members 11, 12, reliability degradation due to uneven adhesive application or adhesive degradation does not occur.

[0055] In the first coupling member 1 of this embodiment, the outer fitting portion 110 includes an engagement hole 110a radially extending through the outer fitting portion 110. The inner fitting portion 120 includes an engagement protrusion 120a radially projecting outward from the inner fitting portion 120.

[0056] The engaging holes 110a and the engaging protrusions 120a are capable of engaging with each other. The engaging protrusions 120a are inserted into the engaging holes 110a, thereby engaging with each other. Furthermore, the outer fitting portion 110 includes a plurality of engaging holes 110a arranged in a point-symmetrical manner about the central axis CA. The inner fitting portion 120 includes a plurality of engaging protrusions 120a that engage by being inserted into the plurality of engaging holes 110a. In other words, the inner fitting portion 120 includes a plurality of engaging protrusions 120a arranged in a point-symmetrical manner about the central axis CA.

[0057] In the configuration in which the outer fitting portion 110 is provided with the engagement hole 110a and the inner fitting portion 120 is provided with the engagement protrusion 120a, when the outer fitting portion 110 and the inner fitting portion 120 are fixed by laser welding, the engagement hole 110a and the engagement protrusion 120a are engaged, thereby temporarily fixing the first component 11 and the second component 12. This improves the workability of the laser welding process.

[0058] Furthermore, when the engaging protrusion 120a is engaged with the engaging hole 110a to temporarily secure the first component 11 and the second component 12, the outer engaging portion 110 as a whole elastically deforms (specifically, deforms into an elliptical shape), thereby facilitating the engagement of the engaging protrusion 120a with the engaging hole 110a. Consequently, the first component 11 and the second component 12 can be easily temporarily secured without damaging the outer engaging portion 110 and the inner engaging portion 120.

[0059] In addition, after the first component 11 and the second component 12 are fixed by laser welding, if the engagement of the engaging protrusion 120a relative to the engaging hole 110a is maintained, stress is easily generated at the engaging portion between the engaging hole 110a and the engaging protrusion 120a, which may cause damage to the engaging portion between the engaging hole 110a and the engaging protrusion 120a and its surrounding areas.

[0060] Therefore, in the first coupling member 1 of the present embodiment, in a state where the first member 11 and the second member 12 are fixed, a gap G1 is provided between the engagement hole 110a and the engagement protrusion 120a in the axial direction (see Figure 7 ). This can suppress the generation of stress at the engagement portion between the engagement hole 110a and the engagement protrusion 120a.

[0061] <Structure of the Second Connecting Member> like Figure 8 As shown, the second coupling member 2 includes a first member 21 and a second member 22. The first member 21 and the second member 22 are fixed to each other. By fixing the first member 21 and the second member 22 to each other, the first member 21 and the second member 22 are connected to each other in the axial direction. Figure 9 2 is a cross-sectional view showing a state in which the first member 21 and the second member 22 are fixed to each other (a cross-sectional view of a single body of the second coupling member 2 ). Figure 9 The cross section shown corresponds to a cross section taken along a plane including the central axis CA.

[0062] The tube TU is connected to the first component 21. The first coupling component 1 (i.e., another coupling component) is connected to the second component 22. In the following description, of the two axial sides of the second coupling component 2, the side connected to the tube TU is referred to as the first axial side of the second coupling component 2, and the side connected to the first coupling component 1 is referred to as the second axial side of the second coupling component 2. Furthermore, within the second coupling component 2, ink can flow from one axial side to the other, and from the other axial side to the first axial side.

[0063] The first component 21 has a tube connection portion 211. The tube connection portion 211 is cylindrical and centered on the central axis CA. The tube connection portion 211 is located on one side of the first component 21 in the axial direction. The tube TU is inserted through the tube connection portion 211, thereby connecting the tube TU to the first component 21.

[0064] Furthermore, the first member 21 has an outer fitting portion 210. The outer fitting portion 210 is disposed on the other axial side of the first member 21. The outer fitting portion 210 has a cylindrical shape centered on the central axis CA.

[0065] The second member 22 has a cylindrical shape centered on the central axis CA. Ink flows inside the second member 22 .

[0066] The second component 22 has a sealing portion 221 on its outer circumferential surface. The sealing portion 221 is a portion where a sealing member Or is disposed. The sealing member Or of the sealing portion 221 is an O-ring formed from an elastic body such as rubber. The sealing member Or is fitted onto the outer circumferential surface of the second component 22, forming the sealing portion 221.

[0067] In the connected state ( Figure 3 and Figure 5 In the state shown (see FIG2 ), the second component 22 of the second coupling component 2 is embedded inside the second component 12 of the first coupling component 1. In this state, the outer periphery of the seal member Or of the sealing portion 221 of the second coupling component 2 is in close contact with the inner periphery of the second component 12 of the first coupling component 1. Thus, when the second component 22 of the second coupling component 2 is embedded inside the second component 12 of the first coupling component 1 (i.e., in the connected state), the axial flow of ink radially outside the second component 22 of the second coupling component 2 is restricted.

[0068] The second component 22 holds the second valve mechanism V2 within it. Specifically, the second coupling component 2 includes the second valve mechanism V2 radially inward. The second valve mechanism V2 is arranged radially inward of the second component 22. The second valve mechanism V2 includes a movable valve 201 and a compression coil spring 202. The movable valve 201 is a resin molded product. The compression coil spring 202 serves as a "second biasing member."

[0069] The second valve mechanism V2 includes a second valve housing. The second member 22 corresponds to the "second valve housing." That is, the second valve housing has a cylindrical shape centered on the central axis CA.

[0070] The movable valve 201 is disposed radially inward of the second member 22. The movable valve 201 is cylindrical centered on the central axis CA. Ink flows axially between the second member 22 and the movable valve 201 in the radial direction. In other words, ink flows within the second member 22.

[0071] The movable valve 201 has a second sealing portion 200 on its outer circumferential surface. Specifically, the second coupling member 2 has the second sealing portion 200 radially inward. The second sealing portion 200 is the portion of the movable valve 201 where the annular seal Or is mounted. In the following description, the seal Or mounted on the movable valve 201 is referred to as the second seal Or2. Furthermore, the movable valve 201 has an annular second sealing groove (reference numeral omitted) extending continuously in the circumferential direction. The second seal Or2 is disposed in this second sealing groove.

[0072] The second seal member Or2 is an O-ring formed from an elastic material such as rubber. The second seal member Or2 is fitted onto the outer circumferential surface of the movable valve 201, forming the second seal portion 200. The outer circumference of the second seal member Or2 is capable of close contact with the inner circumferential surface of the second component 22. In other words, the second seal portion 200 is capable of close contact with the inner circumferential surface of the second component 22 (specifically, the inclined surface 2220 of the second protrusion 222, described later).

[0073] The second sealing portion 200 restricts the flow of ink inside the second member 22 by being in close contact with the inner peripheral surface of the second member 22. That is, the second sealing portion 200 restricts the flow of ink inside the second coupling member 2.

[0074] The second component 22 has a second protrusion 222 on its inner circumferential surface that protrudes radially inward and serves as a portion for close contact with the second sealing portion 200. The second protrusion 222 extends continuously in the circumferential direction and forms an annular shape. In other words, the second protrusion 222 is a circumferentially annular protrusion. The second protrusion 222 has an inner diameter that is smaller than the inner diameter of the rest of the second component 22.

[0075] The compression coil spring 202 is positioned radially inward of the second member 22. The compression coil spring 202 generates an axial force. As a result, the compression coil spring 202 biases the movable valve 201 toward the other axial direction. In other words, the compression coil spring 202 biases the movable valve 201 toward the side connected to the first coupling member 1.

[0076] However, in the disconnected state ( Figure 9 In the state shown in FIG, the movable valve 201 is restricted from moving to the other side in the axial direction. Therefore, the movable valve 201 will not fall off from the radial inner side of the second component 22 to the outside of the second component 22.

[0077] Furthermore, the compression coil spring 202 urges the first component 21 toward one side in the axial direction. Specifically, the compression coil spring 202 urges the first component 21 away from the second component 22. However, the first component 21 and the second component 22 are fixed to each other. Therefore, the first component 21 does not separate from the second component 22.

[0078] The second member 22 has an inner fitting portion 220. The inner fitting portion 220 is disposed on one side in the axial direction of the second member 22. Specifically, the inner fitting portion 220 is formed at one side in the axial direction of the cylindrical body of the second member 22.

[0079] The outer fitting portion 210 of the first component 21 and the inner fitting portion 220 of the second component 22 are fitted together. Specifically, the inner fitting portion 220 fits inside the outer fitting portion 210. In other words, the inner fitting portion 220 is inserted inside the outer fitting portion 210. In this state, at least a portion of the inner circumferential surface 2100 of the outer fitting portion 210 and the outer circumferential surface 2200 of the inner fitting portion 220 are in contact with each other.

[0080] The first component 21 and the second component 22 are fixed to each other with the outer fitting portion 210 and the inner fitting portion 220 interlocked. Laser welding is used to secure the first and second components 21 and 22. Specifically, while the outer and inner fitting portions 210 and 220 are interlocked, laser light is irradiated from the radially outer side of the outer fitting portion 210 onto the interlocking portion between the outer and inner fitting portions 210 and 220. This causes the respective resins to fuse together at the interface between the outer and inner fitting portions 210 and 220. In other words, the first component 21 and the second component 22 are secured to each other at their interlocking portion.

[0081] In the second coupling component 2 of this embodiment, similar to the first coupling component 1, to precisely secure the first component 21 and the second component 22, the inner circumferential surface 2100 of the outer fitting portion 210 and the outer circumferential surface 2200 of the inner fitting portion 220 are each tapered, expanding from one axial side toward the other in a direction away from the central axis CA. Specifically, the inner diameter of the outer fitting portion 210 gradually increases from one axial side toward the other, while the outer diameter of the inner fitting portion 220 gradually increases from one axial side toward the other.

[0082] This structure suppresses play between the first and second members 21, 22 and improves coaxiality between the first and second members 21, 22, thereby accurately fixing the first and second members 21, 22. As a result, the second coupling member 2 can also suppress liquid leakage.

[0083] Furthermore, in the second coupling member 2 of the present embodiment, a clearance between the inner peripheral surface 2100 of the outer fitting portion 210 and the outer peripheral surface 2200 of the inner fitting portion 220 in the radial direction is 0.1 mm or less.

[0084] Furthermore, in the second coupling member 2 of the present embodiment, the light absorption rate of the outer fitting portion 210 is lower than the light absorption rate of the inner fitting portion 220 .

[0085] Furthermore, in the second coupling member 2 of this embodiment, the outer fitting portion 210 has an engagement hole 210a that radially penetrates the outer fitting portion 210. The inner fitting portion 220 has an engagement protrusion 220a that protrudes radially outward from the inner fitting portion 220. The outer fitting portion 210 has a plurality of engagement holes 210a arranged point-symmetrically about the central axis CA. The inner fitting portion 220 has a plurality of engagement protrusions 220a that engage by being inserted into the plurality of engagement holes 210a.

[0086] As a result, the manufacturing process of the second coupling member 2 can also achieve the same effects as the manufacturing process of the first coupling member 1. Specifically, the workability of the laser welding process can be improved. Furthermore, when the engaging protrusion 220a is engaged with the engaging hole 210a to temporarily secure the first and second members 21, 22, it is possible to prevent damage to at least one of the outer fitting portion 210 and the inner fitting portion 220.

[0087] In addition, in the second coupling member 2 of the present embodiment, a gap G2 is provided between the engagement hole 210a and the engagement protrusion 220a in the axial direction in a state where the first member 21 and the second member 22 are fixed (see FIG. Figure 9 ). This can suppress the generation of stress at the engagement portion between the engagement hole 210a and the engagement protrusion 220a.

[0088] <Connection Structure of First and Second Connecting Members> The flow channel connection mechanism 1000 has Figure 10 The connecting component 3 shown in FIG. Connecting component 3 connects the first connecting component 1 and the second connecting component 2. Connecting component 3 is mounted on the second connecting component 2. Connecting component 3 may also be a component of the second connecting component 2. With connecting component 3 mounted on the second connecting component 2, the first connecting component 1 and the second connecting component are connected.

[0089] The connecting member 3 has a cylindrical shape centered on the central axis CA. The connecting member 3 is arranged so that its inner peripheral surface radially faces the outer peripheral surface of the second connecting member 2. That is, the connecting member 3 covers the second connecting member 2 from the radial outside.

[0090] The connecting member 3 is rotatable about the central axis CA when it is attached to the second connecting member 2. In the disconnected state ( Figure 4 In the state shown), the connecting component 3 can be freely rotated manually.

[0091] The connecting member 3 has a plurality of protrusions 3a arranged at intervals in the circumferential direction on its inner peripheral surface in order to rotatably attach the connecting member 3 to the second coupling member 2. The plurality of protrusions 3a protrude radially inward from the inner peripheral surface of the connecting member 3.

[0092] The second coupling member 2 has an annular groove 2a extending continuously in the circumferential direction. The groove 2a is formed on the outer peripheral surface of the first member 21. That is, the first member 21 has the groove 2a on the outer peripheral surface.

[0093] The protrusion 3a of the connecting member 3 fits into the groove 2a of the second coupling member 2. This restricts axial movement of the connecting member 3 relative to the second coupling member 2. In other words, the connecting member 3 is prevented from axially moving relative to the second coupling member 2 and becoming detached from the second coupling member 2.

[0094] When the connecting member 3 is displaced in the circumferential direction, the protrusion 3a moves in the circumferential direction along the groove 2a. At this time, the circumferential movement of the protrusion 3a is guided by the groove 2a. As a result, the connecting member 3 rotates around the central axis CA.

[0095] The first coupling member 1 has a connection protrusion 10 (see FIG. Figure 11 The connecting protrusion 10 protrudes radially outward from the outer circumference of the first coupling member 1. The connecting protrusion 10 protrudes radially outward from the outer circumference of the second member 12. A plurality of connecting protrusions 10 are provided. The plurality of connecting protrusions 10 are spaced apart from each other in the circumferential direction.

[0096] The connecting component 3 has a connecting hole portion 30 that passes through in the radial direction. The connecting hole portion 30 is a hole portion for the connecting protrusion 10 to be inserted in the radial direction. In other words, the connecting hole portion 30 is a hole portion that can be engaged with the connecting protrusion 10. There are multiple connecting hole portions 30, which is the same number as the number of connecting protrusions 10. One connecting hole portion 30 is allocated to each of the multiple connecting protrusions 10. The multiple connecting protrusions 10 are respectively embedded in the corresponding connecting hole portions 30. The multiple connecting protrusions 10 are respectively engaged with the corresponding connecting hole portions 30. Thus, the first connecting component 1 and the second connecting component 2 are connected.

[0097] By inserting the first coupling member 1 (ie, the second member 12) into the inner side of the connecting member 3 in the axial direction, that is, inserting the first coupling member 1 into the inner side of the connecting member 3, the connecting protrusion 10 can be engaged with the connecting hole 30. Figure 11 The status of the insert job is shown in .

[0098] To facilitate insertion of the first coupling member 1 into the interior of the connecting member 3, the connecting member 3 has a guide groove 300 on its inner circumferential surface. The guide groove 300 is recessed radially outward from the inner circumferential surface of the connecting member 3 and extends axially. The guide groove 300 extends axially from the end surface of the connecting member 3 that connects to the first coupling member 1 (i.e., the axial end surface) to the connecting hole 30. One guide groove 300 is assigned to each of the multiple connecting holes 30. When the first coupling member 1 is inserted into or removed from the interior of the connecting member 3, the connecting protrusion 10 passes axially through the guide groove 300.

[0099] like Figure 12As shown, the connection hole portion 30 has a wide area 301 and a narrow area 302 having different opening widths in the axial direction. Figure 12 In FIG. 3 , W1 represents the axial opening width of the wide area 301 on the boundary side with the narrow area 302, and W2 represents the axial opening width of the narrow area 302. Figure 12 In FIG. 1 , W represents the axial width of the connecting protrusion 10 .

[0100] The opening width W1 of the wide region 301 is larger than the opening width W2 of the narrow region 302. Furthermore, the opening width W1 of the wide region 301 is larger than the width W of the connecting protrusion 10. On the other hand, the opening width W2 of the narrow region 302 is smaller than the width W of the connecting protrusion 10.

[0101] In the connected state where the first connecting component 1 and the second connecting component 2 are connected, the connecting protrusion 10 is engaged with the edge of the wide area 301 in the connecting hole 30. Specifically, the wide area 301 has an engaging area 3011. The engaging area 3011 is an area in which the axial opening width of the wide area 301 is greater than that of other areas. The engaging area 3011 is an area in which the axial opening width of the wide area 301 is the largest. In addition, the engaging area 3011 is an area in which the circumferential width is greater than the circumferential width of the connecting protrusion 10. In the connected state where the first connecting component 1 and the second connecting component 2 are connected, the connecting protrusion 10 is embedded in the engaging area 3011 in the wide area 301, and the connecting protrusion 10 is engaged with the edge of the engaging area 3011. That is, in the connected state, it becomes Figure 12 The status shown.

[0102] When viewed from the radial direction, the connection hole portion 30 has Figure 12 The opening shape shown. When viewed radially, one edge of the connecting hole 30 on one axial side (herein, referred to as the one edge) extends straight in a direction perpendicular to the central axis CA. On the other hand, when viewed radially, one edge of the connecting hole 30 on the other axial side opposite to the one edge (herein, referred to as the other edge) extends in a stepped shape in a direction perpendicular to the central axis CA.

[0103] When the first and second coupling members 1 and 2 are connected, the forces of the compression coil springs 102 and 202 bias the first and second coupling members 1 and 2 toward separation. Since the connecting member 3 is attached to the second coupling member 2, axial displacement of the second coupling member 2 causes the connecting member 3 to displace axially along with the second coupling member 2. Consequently, the connecting protrusion 10 engages with the other edge of the engaging region 3011 (i.e., a portion of the edge extending into the stepped shape).

[0104] <State of the Valve Mechanism During Connection and Disconnection> In the following description, in order to easily distinguish the second component 12 of the first connecting component 1 from the second component 22 of the second connecting component 2, the second component 12 of the first connecting component 1 is referred to as the first valve housing 12, and the second component 22 of the second connecting component 2 is referred to as the second valve housing 22.

[0105] When connecting the first coupling member 1 and the second coupling member 2, the second valve housing 22 is axially inserted into the inner side of the first valve housing 12. As the second valve housing 22 is inserted into the inner side of the first valve housing 12, the second valve housing 22 axially contacts the hollow movable valve 101. As the second valve housing 22 is further inserted into the inner side of the first valve housing 12, the hollow movable valve 101 is pressed by the second valve housing 22 in a direction that overcomes the force of the compression coil spring 102.

[0106] As a result, the hollow movable valve 101 is displaced in a direction that overcomes the force of the compression coil spring 102. Specifically, the first protrusion 1012 is displaced to a position where it is not in close contact with the first sealing portion 100 (i.e., the first sealing member Or1). As a result, ink can flow into the interior of the first coupling member 1 (see Figure 5 ).

[0107] Furthermore, as the second valve housing 22 is inserted into the first valve housing 12, the support 103 axially contacts the movable valve 201. As the second valve housing 22 is further inserted into the first valve housing 12, the support 103 presses the movable valve 201 in a direction that overcomes the biasing force of the compression coil spring 202.

[0108] As a result, the movable valve 201 is displaced in a direction that overcomes the biasing force of the compression coil spring 202. Specifically, the second sealing portion 200 (i.e., the second sealing member Or2) is displaced to a position where it is not in close contact with the second protrusion 222. As a result, ink can flow through the interior of the second coupling member 2 (see Figure 5 ).

[0109] As a result, in the connected state where the first coupling member 1 and the second coupling member 2 are connected, that is, in the state where the second valve housing 22 is axially inserted into the inner side of the first valve housing 12, the ink flow paths of the first coupling member 1 and the second coupling member 2 are connected to each other. In this connected state, ink flows inside the hollow movable valve 101 and inside the second valve housing 22.

[0110] Furthermore, in the present embodiment, in the disconnected state where the connection between the first connecting member 1 and the second connecting member 2 is disconnected, that is, when the second valve housing 22 is removed from the inside of the first valve housing 12, the first protrusion 1012 is held in a position in close contact with the first sealing portion 100 by the force of the compression coil spring 102 (see FIG. Figure 7 ). This restricts the flow of ink inside the first coupling member 1 (specifically, inside the hollow movable valve 101). As a result, when the connection is released, ink leakage from the first coupling member 1 can be suppressed.

[0111] In addition, in the disconnected state, the second sealing portion 200 is maintained at a position in close contact with the second protrusion 222 by the force of the compression coil spring 202 (see Figure 9 ). This restricts the flow of ink inside the second coupling member 2 (specifically, inside the second valve housing 22). As a result, when the connection is released, leakage of ink from the second coupling member 2 can be suppressed.

[0112] When the connection state is changed to the disconnection state, that is, when the second valve housing 22 is removed from the inner side of the first valve housing 12, the first sealing portion 100 (i.e., the first sealing member Or1) is in close contact with the first protrusion 1012 and the second sealing portion 200 (i.e., the second sealing member Or2) is in close contact with the second protrusion 222 (hereinafter referred to as the sealed state). Figure 13 The middle portion shows a state (at the moment) when the second valve housing 22 is removed from the inside of the first valve housing 12 .

[0113] Furthermore, the second valve housing 22 is removed from the inside of the first valve housing 12 in a sealed state. That is, after the sealed state is achieved, the second valve housing 22 is separated from the hollow movable valve 101, and the support column 103 is separated from the movable valve 201. This prevents ink from splashing when the second valve housing 22 is removed from the inside of the first valve housing 12 (at that moment).

[0114] In addition, in this embodiment, the second protrusion 222 of the second valve housing 22 has an inclined surface 2220 (see Figure 9 The inclined surface 2220 is inclined toward the direction closer to the central axis CA on the side connected to the first coupling member 1. In other words, a portion of the inner circumferential surface of the second valve housing 22 is inclined toward the direction closer to the central axis CA on the side connected to the first coupling member 1. The inclined surface 2220 is located at the end of the second valve housing 22 on the side connected to the first coupling member 1 (i.e., the axial end).

[0115] Furthermore, in the disconnected state, where the connection between the first coupling member 1 and the second coupling member 2 is released, the force of the compression coil spring 202 biases the movable valve 201 toward the connection side with the first coupling member 1. Specifically, the force of the compression coil spring 202 biases the second sealing portion 200 toward the second protrusion 222. This allows the second sealing portion 200 (specifically, the second sealing member Or2) to closely contact the inclined surface 2220 of the second protrusion 222. As a result, the second coupling member 2 can be easily sealed to prevent ink leakage.

[0116] In this embodiment, the support 103 includes an axially protruding valve protrusion 1031. Furthermore, the movable valve 201 includes an axially recessed valve recess 2011. The valve protrusion 1031 protrudes axially into a cylindrical shape centered on the central axis CA. The valve recess 2011 has a circular opening centered on the central axis CA. When viewed axially, the diameter of the valve protrusion 1031 is smaller than the opening diameter of the valve recess 2011. Consequently, the valve protrusion 1031 can fit into the valve recess 2011.

[0117] In this embodiment, the second valve housing 22 is inserted into the first valve housing 12 while the valve protrusion 1031 is inserted into the valve recess 2011. In this state, as the second valve housing 22 continues to be inserted into the first valve housing 12, the support column 103 presses the movable valve 201, causing the movable valve 201 to shift in a direction that overcomes the biasing force of the compression coil spring 202. As a result, the first and second coupling members 1 and 2 are connected. Specifically, in this connected state, the valve protrusion 1031 is inserted into the valve recess 2011.

[0118] With this structure, the movable valve 201 maintains a stable posture. Therefore, when the first coupling member 1 and the second coupling member 2 are disconnected, tilting of the movable valve 201 relative to the axial direction is suppressed, and the movable valve 201 is smoothly urged in the axial direction by the biasing force of the compression coil spring 202. In other words, even when the spring load of the compression coil spring 202 is low, the movable valve 201 is smoothly displaced in the axial direction.

[0119] This reduces the spring load of the compression coil spring 202. By reducing the spring load of the compression coil spring 202, the connection between the first and second coupling members 1 and 2—that is, when the second valve housing 22 is inserted into the interior of the first valve housing 12 and the movable valve 201 is pressed by the support 103—can be performed with less force. This improves the workability of the connection operation. Furthermore, when disconnecting the first and second coupling members 1 and 2, the movable valve 201 smoothly shifts in the axial direction, improving the workability of the disconnection operation.

[0120] The support column 103 and the movable valve 201 are each molded from resin. The outer diameter of the support column 103 is smaller than the outer diameter of the movable valve 201. In other words, the radial thickness of the support column 103 is smaller than the radial thickness of the movable valve 201.

[0121] In the manufacture of resin molded products, the temperature difference between the surface and interior of the resin molded product causes dimensional errors in the finished product. The thicker the resin molded product, the greater the temperature difference, and the lower the dimensional accuracy of the resin molded product.

[0122] Therefore, in this embodiment, the support column 103 is provided with a valve protrusion 1031, and the movable valve 201 is provided with a valve recess 2011. Furthermore, the second seal portion 200 is provided in a portion that radially overlaps with the valve recess 2011. Specifically, a second seal groove (reference numeral omitted) is formed in a portion of the outer peripheral surface of the movable valve 201 that radially overlaps with the valve recess 2011.

[0123] With this structure, the second seal groove is formed in a thinner area. This allows the second seal groove to be formed with high precision. In other words, the mounting accuracy of the second seal member Or2 relative to the movable valve 201 is improved.

[0124] <Cleaning of connecting parts> The first coupling member 1 displaces the hollow movable valve 101 in the axial direction relative to the first valve housing 12 between a connected state in which the second coupling member 2 is connected and a disconnected state in which the second coupling member 2 is not connected. Thus, the first coupling member 1 allows ink to flow when in the connected state, but restricts ink flow when in the disconnected state.

[0125] Furthermore, the first coupling member 1 has a shape that can suppress the hollow movable valve 101 from falling off from the first valve housing 12. Specifically, Figure 7 As shown, the hollow movable valve 101 has a flange portion 101a with a larger outer diameter than the rest of the hollow movable valve 101. The first valve housing 12 has a small-diameter portion (reference numerals omitted) with a smaller inner diameter and a large-diameter portion (reference numerals omitted) with a larger inner diameter. The first valve housing 12 also includes a step at the boundary between the small-diameter and large-diameter portions, serving as a disengagement prevention portion 12a. When disconnected, the flange portion 101a and the disengagement prevention portion 12a engage axially. This prevents the hollow movable valve 101 from falling out of the first valve housing 12.

[0126] In this structure, when the first coupling member 1 and the second coupling member 2 are connected, a gap G is generated between a predetermined portion of the hollow movable valve 101 and the first valve housing 12 in the radial direction (see FIG. Figure 5 The portion of the hollow movable valve 101 that is radially opposed to the large-diameter portion of the first valve housing 12 in the connected state is a predetermined portion.

[0127] For example, before the inkjet recording device 500 is shipped, the first coupling member 1 and the second coupling member 2 are connected to allow ink to circulate. Furthermore, when the inkjet recording device 500 is shipped, the ink circulation path is cleaned while the first coupling member 1 and the second coupling member 2 are connected.

[0128] Here, ink easily accumulates in the gap G between the hollow movable valve 101 and the first valve housing 12. If the ink in the gap G is not properly discharged, it becomes difficult to replace the ink with the storage liquid in the gap G. Therefore, the cleaning operation takes time.

[0129] Therefore, in this embodiment, if Figure 14 As shown, the hollow movable valve 101 has a flow opening 1010 in a predetermined portion (i.e., the portion radially opposite the large-diameter portion of the first valve housing 12 in the connected state). The flow opening 1010 radially penetrates the predetermined portion of the hollow movable valve 101. For example, the axial width of the flow opening 1010 is greater than the radial wall thickness of the hollow movable valve 101. Furthermore, there are multiple flow openings 1010 (e.g., two), evenly spaced circumferentially around the central axis CA.

[0130] In this embodiment, by providing the flow port 1010 in the hollow movable valve 101, ink accumulated in the gap G between the hollow movable valve 101 and the first valve housing 12 can be discharged through the flow port 1010. This facilitates cleaning of the first coupling member 1.

[0131] In addition, the shape of the flow port 1010 is not limited to Figure 14 The shape shown.

[0132] For example, the flow port 1010 may also be Figure 15 The shape shown. Figure 15 In the first modified example shown, the hollow movable valve 101 has multiple (e.g., two) flow ports 1010. The multiple flow ports 1010 extend circumferentially. Furthermore, the multiple flow ports 1010 are staggered circumferentially around the entire circumference of the hollow movable valve 101. With this configuration, the flow ports 1010 are provided throughout the entire circumference of the hollow movable valve 101. This allows ink accumulated in the gap G between the hollow movable valve 101 and the first valve housing 12 to be efficiently discharged.

[0133] In addition, the flow port 1010 can also be Figure 16 The shape shown. Figure 16In the second modified example shown, the hollow movable valve 101 has a single flow opening 1010. The flow opening 1010 extends in a spiral shape. Furthermore, the circumferential length of the flow opening 1010 is longer than the circumference of the hollow movable valve 101. In other words, the flow opening 1010 extends circumferentially around the hollow movable valve 101 for more than one revolution. With this structure, the flow opening 1010 is provided along the entire circumference of the hollow movable valve 101. This allows ink accumulated in the gap G between the hollow movable valve 101 and the first valve housing 12 to be effectively discharged.

[0134] In addition, Figure 15 and Figure 16 In the structure shown, a low rigidity portion is present, in which the end portion of the flow port 1010 is plural in the axial direction. Figure 15 and Figure 16 In the figure, the low rigidity portion is surrounded by a dotted line. Figure 15 In the structure shown, the low rigidity portion appears at least in two places. Figure 16 In the structure shown, the low rigidity portion appears only in one place. Figure 16 The structure shown is Figure 15 Compared with the structure shown, it is possible to suppress a decrease in the rigidity of the hollow movable valve 101 .

[0135] exist Figures 14 to 16 In the figure, the seal Or is omitted.

[0136] <Rotation Restriction by Concavo-Concave and Concave Shape of Connecting Member> When connecting the first coupling member 1 and the second coupling member 2, the second member 12 of the first coupling member is inserted into the inner side of the connecting member 3. In this state, the connecting member 3 is rotated in one direction relative to the first coupling member 1. This causes the connecting protrusion 10 to reach a position where it can axially engage with the connecting hole 30, and the connecting protrusion 10 and the connecting hole 30 are axially engaged. In other words, the first coupling member 1 and the connecting member 3 are axially engaged. As a result, the first coupling member 1 and the second coupling member 2 are connected.

[0137] Specifically, when the first coupling member 1 is inserted into the inner side of the connecting member 3 along the axial direction, the circumferential positions of the connecting protrusion 10 and the guide groove 300 are aligned (refer to FIG. Figure 11 In this state, the first coupling member 1 is inserted axially into the interior of the connecting member 3. In other words, when the first coupling member 1 is inserted into the interior of the connecting member 3, the connecting protrusion 10 passes axially through the guide groove 300. In other words, the first coupling member 1 is inserted so that the connecting protrusion 10 moves axially along the guide groove 300. As a result, the connecting protrusion 10 reaches the connecting hole 30.

[0138] Furthermore, the guide groove 300 is not connected to the wide area 301 of the connecting hole 30, but is connected to the narrow area 302. That is, during the insertion of the first connecting member 1, the connecting protrusion 10 is guided toward the narrow area 302 by the guide groove 300. Therefore, simply inserting the first connecting member 1 into the inner side of the connecting member 3 does not cause the connecting protrusion 10 to axially engage with the connecting hole 30.

[0139] In order to engage the connecting protrusion 10 with the connecting hole 30 in the axial direction, it is necessary to insert the first connecting member 1 into the inner side of the connecting member 3 and then rotate the connecting member 3 in one direction relative to the first connecting member 1. Specifically, it is necessary to insert the first connecting member 1 into the inner side of the connecting member 3 and then rotate the connecting member 3 in a direction relative to the first connecting member 1. Figure 17A status, Figure 17B Status and Figure 17C The state of the sequential migration is rotated. In addition, Figures 17A to 17C In each state, the left-right direction of the drawing corresponds to the axial direction, and the up-down direction of the drawing corresponds to the circumferential direction.

[0140] As the connecting member 3 rotates relative to the first coupling member 1, the circumferential position of the connecting protrusion 10 shifts relative to the connecting hole 30. This allows the connecting protrusion 10 to move from the narrow width region 302 to the wide width region 301 (specifically, the engagement region 3011). Consequently, the connecting protrusion 10 can be axially engaged with the connecting hole 30.

[0141] However, when the connecting member 3 is rotated relative to the first connecting member 1, if the first connecting member 1 rotates together with the connecting member 3, the connecting protrusion 10 cannot reach a position where it can axially engage with the connecting hole 30. In other words, even if the connecting member 3 is rotated in one direction, the connecting protrusion 10 cannot axially engage with the connecting hole 30.

[0142] In order to suppress this disadvantage, in this embodiment, Figure 18 As shown, a rotation limiting portion is provided on the first connecting member 1 and the second connecting member 2, respectively. The first connecting member 1 and the second connecting member 2 each have a concave-convex portion R that is concave and convex in the axial direction as a rotation limiting portion. The concave-convex portion R includes a plurality of convex portions arranged periodically in the circumferential direction. In other words, the concave-convex portion R includes a plurality of convex portions arranged at a predetermined periodic angle θ in the circumferential direction. The area between adjacent convex portions in the circumferential direction is a concave portion. Hereinafter, as needed, the concave-convex portion R of the first connecting member 1 is marked with the reference symbol R1, and the concave-convex portion R of the second connecting member 2 is marked with the reference symbol R2 to distinguish them.

[0143] The convex-concave portions R are provided at axially opposing portions of the first and second coupling components 1 and 2. Specifically, the convex-concave portion R1 is provided at the axial end of the second component 12 of the first coupling component 1. The convex-concave portion R2 is provided at the axial end of the second component 22 (i.e., the second valve housing 22) of the second coupling component 2. This allows the convex-concave portions R of the first and second coupling components 1 and 2 to engage with each other in the circumferential direction. By fitting the convex portion of the convex-concave portion R1 into the concave portion of the convex-concave portion R2, and the convex portion of the convex-concave portion R2 into the concave portion of the convex-concave portion R1, the convex-concave portions R of the first and second coupling components 1 and 2 can engage with each other in the circumferential direction. Inserting the first coupling component 1 into the interior of the connecting component 3 allows the convex-concave portions R of the first and second coupling components 1 and 2 to engage with each other in the circumferential direction.

[0144] With this structure, when the connecting member 3 is rotated relative to the first coupling member 1, the circumferential engagement of the concave-convex portions R of the first coupling member 1 and the second coupling member 2 prevents the first coupling member 1 from rotating together with the connecting member 3. This improves the workability of connecting the first coupling member 1 and the second coupling member 2. It also improves the workability of the disconnection operation (described in detail later) to disconnect the first coupling member 1 and the second coupling member 2. Furthermore, it prevents the tube TU connected to the first coupling member 1 from being accidentally twisted, eliminating the need to eliminate (or prevent) twisting of the tube TU.

[0145] Furthermore, in this embodiment, the first and second coupling members 1 and 2 each include a compression coil spring 102 and 202. When the first and second coupling members 1 and 2 are connected, the respective urging forces of the compression coil springs 102 and 202 bias the first and second coupling members 1 and 2 axially apart from each other.

[0146] At this time, since the connecting protrusion 10 is located in the wide area 301 (specifically, the engagement area 3011), Figure 17B Status Figure 17C Therefore, if Figure 19A and Figure 19B As shown, the first and second coupling members 1 and 2 are in a state where the concave-convex portions R are engaged with each other in the circumferential direction ( Figure 19A ), to a state in which the concavo-convex portions R of the first and second coupling members 1 and 2 are separated from each other in the axial direction ( Figure 19B That is, the engagement between the concave-convex portions R of the first coupling member 1 and the second coupling member 2 is released.

[0147] Since the concave-convex portions R of the first and second coupling members 1 and 2 are axially separated from each other, the first and second coupling members 1 and 2 can each rotate freely. Therefore, if twisting of the tube TU is detected after the first and second coupling members 1 and 2 are connected, the twisting of the tube TU can be eliminated while maintaining the connection between the first and second coupling members 1 and 2.

[0148] In addition, in this embodiment, the concavo-convex portion R has a Figure 20 In addition, Figure 20 In the figure, the double arrow Da indicates the axial direction. Figure 20 , the left-right direction of the drawing corresponds to the axial direction, and the up-down direction of the drawing corresponds to the circumferential direction.

[0149] The convex portion of the concavo-convex portion R is tapered from the base end toward the tip. This allows the convex portion of one concavo-convex portion R to be easily inserted into the concave portion of the other concavo-convex portion R, regardless of the circumferential positions of the first and second coupling members 1 and 2. In other words, the concavo-convex portions R of the first and second coupling members 1 and 2 can be easily engaged with each other.

[0150] Furthermore, in this embodiment, the first side surface S1 of the convex portion of the concavo-convex portion R, which faces the circumferential direction, is inclined at least 45° relative to the direction perpendicular to the central axis CA when viewed radially. That is, when viewed radially, the first side surface S1 is a surface having a first angle θ1 of at least 45°, where the first angle θ1 is the angle between the first side surface S1 and the direction perpendicular to the central axis CA. This makes it easier to fit the convex portion of one concavo-convex portion R into the concave portion of the other concavo-convex portion R.

[0151] Furthermore, in this embodiment, as viewed in the radial direction, a second side surface S2 of the convex portion of the concavo-convex portion R, which faces the circumferentially opposite side surface S1, is a surface having a second angle θ2 greater than the first angle θ1. The second angle θ2 is the angle between the second side surface S2 and a direction perpendicular to the central axis CA. For example, the first angle θ1 is approximately 45°, and the second angle θ2 is approximately 90°.

[0152] Furthermore, in this embodiment, the second side surfaces S2 of one concavo-convex portion R and the other concavo-convex portion R are circumferentially engaged with each other. This stabilizes the circumferential engagement between the one concavo-convex portion R and the other concavo-convex portion R.

[0153] <Shape of the Axial End Surface of the Connecting Component> When connecting the first connecting member 1 and the second connecting member 2, the connecting member 3 needs to be rotated. If the main body of the connecting member 3 can be grasped with the fingers, this operation is easier. However, sometimes the space for installing the flow path connection mechanism 1000 is limited. In this case, the main body of the connecting member 3 cannot be grasped with the fingers, making the rotation of the connecting member 3 difficult.

[0154] Therefore, in this embodiment, if Figure 21 and Figure 22 As shown, the connecting member 3 has an axially protruding protrusion 31 on its axial end face. The protrusion 31 protrudes axially from the end face of the connecting member 3 on the side opposite to the side connected to the first connecting member 1. The end face of the connecting member 3 on the side opposite to the side connected to the first connecting member 1 serves as the working surface that the operator's fingers come into contact with during the rotation operation of the connecting member 3. In the following description, for convenience, the end face of the connecting member 3 on the side opposite to the side connected to the first connecting member 1 is referred to as the working surface. The protrusion 31 functions as an anti-slip member that prevents fingers from sliding relative to the working surface of the connecting member 3.

[0155] With this structure, when rotating the connecting member 3, the fingertips press against the working surface of the connecting member 3, causing the fingers to hook onto the protrusion 31. In this state, moving the fingers in the circumferential direction rotates the connecting member 3. This eliminates the need to pinch the main body of the connecting member 3 with the fingers. As a result, even when the flow path connection mechanism 1000 is installed in a small space, rotating the connecting member 3 is easy. This improves the operability of connecting the first connecting member 1 and the second connecting member 2. Furthermore, the operability of the disconnection operation (described in detail later) of disconnecting the first connecting member 1 and the second connecting member 2 is also improved.

[0156] Furthermore, in this embodiment, the ink flow paths of the first and second coupling members 1 and 2 are connected in the axial direction by inserting the second coupling member 2 into the inner side of the first coupling member 1. In this structure, a seal for preventing liquid leakage is not required between the first and second coupling members 1 and 2 and the connecting member 3 in the radial direction.

[0157] Therefore, in this embodiment, the connecting member 3 is not slidable relative to the seal for preventing liquid leakage, but is rotatable. Thus, the connecting member 3 can be easily rotated by simply pressing the fingertips against the working surface of the connecting member 3 and moving them in the circumferential direction, without pinching the main body of the connecting member 3 with the fingers.

[0158] Furthermore, in this embodiment, there are multiple protrusions 31. Furthermore, the multiple protrusions 31 are evenly spaced at angles of 45° or less around the central axis CA. This allows the fingertips to be pressed against the portion of the connecting member 3 where the protrusions 31 are located, regardless of the circumferential position of the connecting member 3.

[0159] Furthermore, in this embodiment, the protrusion 31 protrudes axially from the working surface of the connecting member 3 in a hemispherical shape. Furthermore, the diameter φ of the protrusion 31, as viewed axially, is at least twice the protruding height H (i.e., the axial width) of the protrusion 31. This dimension ensures that the protrusion 31 functions reliably as an anti-slip feature. Furthermore, contact with the protrusion 31 by a finger does not cause pain.

[0160] <Disengagement of the Connecting Protrusion and the Connecting Hole> For example, for maintenance, the connection between the first connecting member 1 and the second connecting member 2 is released. To release the connection between the first connecting member 1 and the second connecting member 2, the engagement between the connecting protrusion 10 and the connecting hole 30 needs to be released.

[0161] When the engagement between the connecting protrusion 10 and the connecting hole 30 is released, the connecting member 3 is pressed. Figure 17C status, Figure 17B Status and Figure 17A The connection member 3 is rotated in a manner that sequentially transitions between the states. Specifically, by rotating the connection protrusion 10 from the state in which it is engaged with the wide area 301 (specifically, the engagement area 3011), the connection protrusion 10 is aligned with the circumferential position of the guide groove 300. This allows the first and second connection members 1 and 2 to separate axially from each other, releasing the engagement between the connection protrusion 10 and the connection hole 30.

[0162] If the connecting protrusion 10 axially hooks onto the edge of the connecting hole 30 when the first connecting member 1 and the second connecting member 2 are separated from each other, it will be difficult to separate the second connecting member 2 from the first connecting member 1. In this case, if the second connecting member 2 is forcibly separated from the first connecting member 1, it may cause a malfunction.

[0163] In order to suppress such an inconvenience, in the present embodiment, the axial opening width W2 of the narrow region 302 is set to be smaller than the axial width W of the connecting protrusion 10. In this structure, by rotating the connecting member 3 from the state in which the connecting protrusion 10 is engaged with the wide region 301 (i.e., the connected state in which the first connecting member 1 and the second connecting member 2 are connected) in the other direction opposite to one direction (i.e., the direction in which the connecting member 3 is rotated when the first connecting member 1 and the second connecting member 2 are connected), at least a portion of the connecting protrusion 10 enters the radially inner side of the outer edge portion of the narrow region 302 (see FIG. 2 ). Figure 17A ).

[0164] Furthermore, with at least a portion of the connecting protrusion 10 radially inward of the outer edge of the narrow region 302, the first and second connecting members 1 and 2 are axially separated from each other. This prevents the connecting protrusion 10 from snagging the edge of the connecting hole 30 in the axial direction. In other words, the second connecting member 2 can be smoothly separated from the first connecting member 1. This improves the workability of the disconnection operation between the first and second connecting members 1 and 2.

[0165] Furthermore, when at least a portion of the connecting protrusion 10 is radially inward of the outer edge of the narrow region 302, the connecting protrusion 10 and the guide groove 300 are aligned in the circumferential direction. Therefore, by ensuring that at least a portion of the connecting protrusion 10 is radially inward of the outer edge of the narrow region 302, the second coupling member 2 can be moved axially away from the first coupling member 1. At this time, since the connecting protrusion 10 passes through the guide groove 300, the connecting protrusion 10 does not contact the coupling member 3, thereby preventing the second coupling member 2 from moving in the axial direction.

[0166] Furthermore, in this embodiment, the boundary 30a between the wide region 301 and the narrow region 302 in the edge of the connecting hole 30 is tilted relative to a direction perpendicular to the central axis CA when viewed radially. This prevents the connecting protrusion 10 from catching on the boundary 30a between the wide region 301 and the narrow region 302, hindering the rotation of the connecting component 3, when the connecting component 3 is rotated and the connecting protrusion 10 enters the radially inner side of the outer edge of the narrow region 302. This prevents the connecting protrusion 10 from being caught on the boundary 30a between the wide region 301 and the narrow region 302, thereby preventing the connecting component 3 from rotating. In other words, the connecting protrusion 10 can smoothly move from the wide region 301 to the narrow region 302.

[0167] In a cross-sectional view taken along a plane perpendicular to the central axis CA, the connecting protrusion 10 has Figure 23A 、 Figure 23B 、 Figure 24A and Figure 24BThe shape shown. That is, the circumferential corners of the connecting protrusion 10 are rounded. However, the present invention is not limited to this, and the circumferential corners of the connecting protrusion 10 may also be chamfered. By rounding or chamfering the circumferential corners of the connecting protrusion 10, it is possible to further prevent the connecting protrusion 10 from catching on the boundary 30a between the wide area 301 and the narrow area 302, thereby hindering the rotation of the connecting component 3.

[0168] <Dimensions of the connecting protrusion> During the connection operation between the first and second coupling components 1 and 2, the connecting protrusion 10 is first inserted into the guide groove 300. In this state, the first coupling component 1 is then inserted into the inner side of the coupling component 3. Specifically, the connecting protrusion 10 passes through the guide groove 300 in the axial direction. At this point, the connecting protrusion 10 is guided by the guide groove 300 and moves in the axial direction. Therefore, the connecting protrusion 10 restricts rotation (i.e., circumferential displacement) of the coupling component 3.

[0169] By continuing to insert the first connecting member 1 into the inner side of the connecting member 3, the concave-convex portions R of the first connecting member 1 and the second connecting member 2 begin to contact each other. At this time, the connecting protrusion 10 is still in the state of being inserted into the guide groove 300 ( Figure 17A That is, the connection member 3 is in a state where rotation is restricted by the connection protrusion 10.

[0170] When the concavo-convex portions R of the first and second coupling members 1 and 2 begin to contact each other, the convex portions of one and the other concavo-convex portions R may collide with each other. In this case, the convex portion of the other concavo-convex portion R is displaced in the circumferential direction relative to the convex portion of the first and second coupling members 1 and 2, so that the convex portion of the first and second concavo-convex portions R fit into the concave portion of the other concavo-convex portion R.

[0171] If the convex portion of the other concavo-convex portion R is not displaced in the circumferential direction relative to the convex portion of the one concavo-convex portion R, the convex portions of the one and other concavo-convex portions R will continue to collide with each other. In this case, the one and other concavo-convex portions R cannot be engaged with each other.

[0172] Therefore, an appropriate amount of play is provided between the connecting protrusion 10 and the guide groove 300 in the circumferential direction. This will be described in detail below. In the following description, the arrangement period angle of the plurality of convex portions of the concavo-convex portion R (i.e., the predetermined period angle θ) is referred to as the convex portion period angle.

[0173] In the following description, the rotation angle of the connecting member 3 until the connecting member 3 is rotated from the state in which the connecting protrusion 10 embedded in the guide groove 300 abuts against one side surface of the guide groove 300 to the state in which the connecting protrusion 10 abuts against the other side surface of the guide groove 300 is referred to as the first rotation angle. Figure 23B The angle θb shown is subtracted Figure 23A The angle obtained by adjusting the angle θa shown corresponds to the first rotation angle. Figure 23A The state where the connecting protrusion 10 abuts against one side surface of the guide groove 300 is shown. Figure 23B The state where the connecting protrusion 10 abuts against the other side surface of the guide groove 300 is shown.

[0174] In this embodiment, the first rotation angle is equal to or greater than ½ of the convex portion period angle. Thus, when the first coupling member 1 is inserted into the inner side of the connecting member 3, the convex portion of one concave-convex portion R can be smoothly inserted into the concave portion of the other concave-convex portion R. As a result, the workability of connecting the first coupling member 1 and the second coupling member 2 is improved.

[0175] Furthermore, during the disconnection operation between the first connecting member 1 and the second connecting member 2, it is also necessary to rotate the connecting member 3 relative to the first connecting member 1. Specifically, during the disconnection operation, the connecting member 3 is first pressed in the direction of overcoming the biasing force of the compression coil springs 102 and 202 (hereinafter referred to as the counter-biasing direction). As a result, the concave-convex portions R of the first connecting member 1 and the second connecting member 2 are engaged with each other in the circumferential direction. That is, Figure 19B Status Figure 19A state transition.

[0176] Next, the connecting member 3 is rotated in a direction opposite to the one direction (i.e., the direction in which the connecting member 3 is rotated when connecting the first and second connecting members 1 and 2). At this point, the concave-convex portions R of the first and second connecting members 1 and 2 engage circumferentially, allowing the connecting member 3 to rotate relative to the first connecting member 1. Specifically, the connecting hole 30 is displaced circumferentially relative to the connecting protrusion 10. As a result, the connecting protrusion 10 enters the radially inner side of the outer edge of the narrow region 302. As a result, the first connecting member 1 can be removed from the inner side of the connecting member 3.

[0177] Here, when the connecting member 3 is pressed in the counter-force direction, the convex portions of the concavo-convex portions R of the first and second connecting members 1 and 2 may collide with each other. In this case, it is necessary to displace the convex portion of one concavo-convex portion R in the circumferential direction relative to the convex portion of the other concavo-convex portion R, thereby fitting the convex portion of one concavo-convex portion R into the concave portion of the other concavo-convex portion R.

[0178] Therefore, in the connected state, there is also appropriate play between the connecting protrusion 10 and the connecting hole 30 in the circumferential direction. In other words, there is appropriate play between the engaging area 3011 of the connecting hole 30 and the connecting protrusion 10 in the circumferential direction. This will be described in detail below.

[0179] In the following description, the rotation angle of the connecting member 3 until the connecting protrusion 10 of the connecting member 3 is rotated from the state in which the connecting protrusion 10 embedded in the engaging area 3011 abuts against one inner edge of the circumference of the engaging area 3011 to the state in which the connecting protrusion 10 abuts against the other inner edge of the circumference of the engaging area 3011 is referred to as the second rotation angle. Figure 24B The angle θd shown is subtracted Figure 24A The angle obtained by adjusting the angle θc shown corresponds to the second rotation angle. Figure 24A The state in which the connecting protrusion 10 abuts against one inner edge of the engagement region 3011 is shown. Figure 24B The state where the connecting protrusion 10 abuts against the other inner edge of the engagement region 3011 is shown.

[0180] In this embodiment, the second rotation angle is equal to or greater than ½ of the convex portion period angle. Thus, when the connecting member 3 is pressed in the counter-force direction to release the connection between the first and second connecting members 1 and 2, the convex portion of one concave-convex portion R can be smoothly inserted into the concave portion of the other concave-convex portion R. As a result, the workability of releasing the connection between the first and second connecting members 1 and 2 is improved.

[0181] It should be understood that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the present invention is indicated not by the description of the embodiments above but by the claims, and includes all modifications within the meaning and scope of the claims as well as equivalents to the claims.

[0182] For example, in the above embodiment, an inkjet recording device that circulates ink within the device is described. However, the present invention is not limited to inkjet recording devices and can also be applied to devices that circulate liquids other than ink. In other words, the flow channel connection mechanism including the coupling member can also circulate liquids other than ink.

Claims

1. A flow channel connection mechanism, characterized in that: include: The first connecting member is a cylindrical body having an axis extending in a predetermined direction as a central axis and having a liquid flow path therein; as well as The second connecting member is a cylindrical body centered on the central axis, connected to the first connecting member in the axial direction, and has a flow path for the liquid inside, so as to circulate the liquid in the axial direction together with the first connecting member. The first coupling member has a first valve mechanism on the radially inner side. The second coupling member has a second valve mechanism on the radially inner side. The first valve mechanism comprises: a first valve housing having a cylindrical shape centered on the central axis; a cylindrical hollow movable valve disposed radially inwardly of the first valve housing and centered on the central axis; a first force applying member disposed radially inward of the first valve housing and applying force to the hollow movable valve toward the side connected to the second coupling member; as well as a support arranged radially inwardly of the first valve housing so as to penetrate the hollow movable valve in the axial direction; The second valve mechanism comprises: a second valve housing having a cylindrical shape centered on the central axis; a columnar movable valve disposed radially inward of the second valve housing and centered on the central axis; and The second biasing member is arranged radially inward of the second valve housing and biases the movable valve toward the side connected to the first coupling member. When the first coupling member and the second coupling member are in a connected state, the second valve housing is inserted into the inner side of the first valve housing, and the second valve housing presses the hollow movable valve, so that the hollow movable valve is displaced in the direction of overcoming the force of the first force-applying member. The support presses the movable valve, causing the movable valve to be displaced in the direction of overcoming the force of the second force-applying member, thereby allowing the liquid to flow between the first coupling member and the second coupling member. One of the support and the movable valve has a valve protrusion protruding in the axial direction, and the other has a valve recess into which the valve protrusion can be inserted. In the connected state, the valve protrusion is fitted into the valve recess.

2. The flow channel connection mechanism according to claim 1, characterized in that: The hollow movable valve has a first protrusion on its inner peripheral surface. The first protrusion protrudes radially inward and extends in a ring shape in the circumferential direction. The support has a first sealing portion on the outer peripheral surface. The first sealing portion is a portion where an annular sealing member is installed. The second valve housing is inserted into the inner side of the first valve housing, and the second valve housing presses the hollow movable valve in the axial direction, so that the first protrusion is displaced to a position where it is not in close contact with the first sealing portion, and the liquid can flow inside the first coupling member. In the disconnected state where the second valve housing is removed from the inside of the first valve housing, the first protrusion is held in close contact with the first sealing portion by the biasing force of the first biasing member, thereby restricting the flow of the liquid inside the first coupling member.

3. The flow channel connection mechanism according to claim 2, characterized in that: The second valve housing has a second protrusion on its inner circumferential surface. The second protrusion protrudes radially inward and extends in a ring shape in the circumferential direction. The movable valve has a second sealing portion on its outer peripheral surface. The second sealing portion is a portion where an annular seal is installed. By inserting the second valve housing into the first valve housing, the support presses the movable valve in the axial direction, thereby displacing the second sealing portion to a position where it is not in close contact with the second protrusion, and the liquid can flow into the interior of the second coupling member. In the disconnected state, the second sealing portion is maintained at a position in close contact with the second protrusion by the biasing force of the second biasing member, thereby restricting the flow of the liquid inside the second coupling member.

4. The flow channel connection mechanism according to claim 3, characterized in that: The second protrusion has an inclined surface that is inclined in a direction approaching the central axis toward the side connected to the first coupling member. In the disconnected state, the movable valve is urged toward the connection side with the first coupling member by the urging force of the second urging member, so that the second sealing portion comes into close contact with the inclined surface.

5. The flow channel connection mechanism according to claim 3 or 4, characterized in that: The support and the movable valve are respectively molded from resin. The valve protrusion is provided on the support column, The valve recess is provided on the movable valve. The second sealing portion is provided at a portion that radially overlaps with the valve recess.

6. The flow channel connection mechanism according to claim 3 or 4, characterized in that: When the second valve housing is removed from the inside of the first valve housing, the second valve housing is separated from the hollow movable valve, and the support is separated from the movable valve, starting from the state in which the first sealing portion is in close contact with the first protrusion and the second sealing portion is in close contact with the second protrusion.

7. An inkjet recording device, characterized in that A flow channel connecting mechanism according to any one of claims 1 to 6, The liquid is ink, Printing was performed using the ink.

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