Fluid supply holder

Abstract

To prevent leakage of fluid from a fluid supply port even when fluid pressure increases.SOLUTION: A fluid supply holder 1 for supplying fluid, which is supplied from a fluid supply port 4 provided adjacent to a spindle 2 of a machining center, to a downstream device 8, comprises: a holder body part 10 that is attachable to and detachable from the spindle; and a fluid intake part 40 provided on a side surface of the holder body part. The fluid intake part comprises: a block body part 41 having a guide hole 60 and a block flow path 71 communicating with a bottom of the guide hole and allowing fluid to pass through, the block body part being provided on the side surface of the holder body part; a guide shaft 50 that is provided with a shaft flow path 53 for passing the fluid in an axial direction thereof, while being fitted into the guide hole and slidable in the guide hole, and one end 54 of which is connected to the fluid supply port; and a pressure chamber 72 for storing the fluid between the bottom surface of the guide hole and another end 55 of the guide shaft and pressing the guide shaft toward the fluid supply port by pressure of the fluid.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fluid supply holder that is attached to the spindle of a machining center and relays fluid supplied from a fluid supply port provided alongside the spindle to a downstream device. [Background technology]

[0002] Conventionally, as a device for taking in fluid supplied from a fluid supply port provided adjacent to the spindle of a machining center, for example, Japanese Patent Laid-Open Publication No. 8-257866 (Patent Document 1) discloses a workpiece inverting device that drives a workpiece gripper. In this workpiece inverting device, coupling pins 36A and 36B (referred to as "guide shafts" in the present invention) are biased by springs 37 in connection with the fluid supply port (see FIG. 3 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-257866 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a configuration in which the guide shaft is biased solely by a spring (elastic body), as in Patent Document 1, when a certain level of fluid pressure is applied, the end of the guide shaft floats away from the fluid supply port, resulting in fluid leakage. While it is possible to increase the repulsive force of the elastic body, doing so would require the elastic body itself to be larger, which could result in a larger device. Furthermore, if the repulsive force of the elastic body is too strong, a large force is required to connect the guide shaft to the fluid supply port, which could accelerate deterioration or damage to the fluid supply port or the O-ring used to seal it.

[0005] The present invention has been made in consideration of the above points, and aims to provide a fluid supply holder that does not leak even when the fluid pressure increases by using the pressure of the supplied fluid to press the guide shaft against the fluid supply port. [Means for solving the problem]

[0006] The fluid supply holder of the present invention comprises: A fluid supply holder that is attached to a spindle of a machining center and relays fluid supplied from a fluid supply port provided adjacent to the spindle to supply the fluid to a downstream device, a holder main body to which a shank is attached that is detachable from the spindle; a fluid intake portion provided on a side surface of the holder main body portion, The fluid intake portion is a block main body portion attached to the holder main body portion, the block main body portion including one or more guide holes provided on a side opposite the fluid supply port and a block flow passage communicating with a bottom of the guide hole and through which a fluid passes; a guide shaft that is fitted into the guide hole and is slidable within the guide hole, and that has a shaft flow passage that penetrates the guide hole in its axial direction and allows a fluid to pass through, and one end of the guide shaft is connected to the fluid supply port; a pressure chamber for storing the fluid supplied from the fluid supply port between the bottom surface of the guide hole and the other end of the guide shaft and for pressing the guide shaft against the fluid supply port by the pressure of the fluid; Equipped with.

[0007] According to the fluid supply holder of the present invention, fluid passing through the shaft flow passage is guided to the pressure chamber and presses the other end of the guide shaft. Therefore, the pressure of the fluid can press one end of the guide shaft against the fluid supply port. This prevents fluid from leaking from the fluid supply port even when the fluid pressure is high. Examples of fluids that can be used include air, oil, and coolant.

[0008] A preferred example of the fluid supply holder of the present invention is An elastic body is provided to bias the guide shaft toward the fluid supply port with a predetermined force.

[0009] According to a preferred example of the fluid supply holder of the present invention, the holder is provided with an elastic body that pre-biases the guide shaft toward the liquid supply port, so that one end of the guide shaft can be pressed against the fluid supply port even when one end of the guide shaft is connected to the fluid supply port and no fluid pressure is yet being applied.

[0010] A preferred example of the fluid supply holder of the present invention is the guide shaft includes a cylindrical shaft portion that is a cylindrical member, and a shaft flange portion that is provided around the cylindrical shaft portion and against which an end of the elastic body abuts, the block main body includes a block lower portion attached to the holder main body portion, and a piston portion and a lid portion provided on a side of the block lower portion facing the fluid supply port, the lower part of the block has a block guide hole into which the cylindrical shaft part is inserted, the piston portion comprises a piston pillar portion which is a pillar-shaped member, a shaft accommodating chamber provided inside the piston pillar portion, allowing the shaft flange portion to move therein and accommodating the elastic body, a piston guide hole which communicates with the shaft accommodating chamber and is provided on the fluid supply port side, allowing only the shaft cylindrical portion to pass through, and a piston flange portion provided around the piston pillar portion, The lid portion has a piston accommodating chamber in which the piston flange is movable, and a lid hole portion that communicates with the piston accommodating chamber and is provided on the fluid supply port side and through which only the piston column portion can pass.

[0011] According to a preferred embodiment of the fluid supply holder of the present invention, the piston portion includes a shaft storage chamber, and the guide shaft is movable within the shaft storage chamber, so that the guide shaft can be pushed toward the lower portion of the block and moved. Therefore, for example, when there are multiple guide shafts and an external force is applied to some of the guide shafts, the guide shafts can be moved individually. Furthermore, since the lid portion includes a piston storage chamber and the piston portion is also movable, applying an external force to the piston portion can move multiple guide shafts simultaneously.

[0012] A preferred example of the fluid supply holder of the present invention is The area of one end of the guide shaft, which is connected to the fluid supply port, is larger than the area of the other end, which is disposed in the pressure chamber.

[0013] In a preferred embodiment of the fluid supply holder of the present invention, the area of the end of the guide shaft that is provided in the pressure chamber is larger than the area of the end that is connected to the liquid supply port. Therefore, even if fluid gets between the liquid supply port and one end of the guide shaft and pressure is applied to one end of the guide shaft, the force of the fluid pushing against the other end of the guide shaft in the pressure chamber is stronger. This ensures that the guide shaft is pressed against the liquid supply port, preventing fluid leakage.

[0014] A preferred example of the fluid supply holder of the present invention is The fluid flow path including the block flow path, the shaft flow path, and the pressure chamber includes a first flow path and a second flow path for driving a downstream device, as well as a spare third flow path.

[0015] According to a preferred embodiment of the fluid supply holder of the present invention, in addition to the first and second flow paths for driving downstream devices, a spare third flow path is provided, so that the supplied fluid can be used for purposes other than driving. [Effects of the Invention]

[0016] As described above, the fluid supply holder of the present invention can use the pressure of the supplied fluid to press the guide shaft against the fluid supply port, thereby preventing fluid leakage from the fluid supply port even if the fluid pressure becomes high. [Brief explanation of the drawings]

[0017] [Figure 1] 1A and 1B are diagrams illustrating a fluid supply holder according to an embodiment of the present invention. [Figure 2] FIG. 10 is a plan view of the fluid supply holder. [Figure 3] FIG. 10 is another view illustrating the fluid supply holder. [Figure 4] FIG. 2 is a diagram illustrating the configuration around a guide shaft. [Figure 5] 10A and 10B are diagrams illustrating another embodiment of the fluid supply holder. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a fluid supply holder 1 according to the present invention will be described in detail below with reference to the accompanying drawings. The fluid supply holder 1 of this embodiment is attached to the spindle 2 of a machining center and relays fluid supplied from a fluid supply port 4 provided in a fluid supply block 3 attached to the spindle 2 to supply the fluid to a downstream device 8. In this embodiment, compressed air is used as the fluid. Furthermore, the fluid supply holder 1 of this embodiment has three circulation paths, such as circulation passages and piping, through which the compressed air passes. Note that, although terms such as up and down are used in the following description, these refer to directions in the drawings; when the fluid supply holder 1 is actually attached to the spindle 2 of a machining center, the directions will change depending on the situation at the time.

[0019] As shown in Figures 1 to 4, the fluid supply holder 1 of this embodiment comprises a holder main body 10 that is detachably attached to the spindle 2 via a shank 11, and a fluid intake portion 40 that is provided on the side of the holder main body 10.

[0020] The holder main body 10 has a holder spacer 12 and a BT holder 13 on its upper part, and the shank 11 is attached to the BT holder 13. The holder main body 10 also has an outer circumferential portion 14 and a main shaft 20. The outer circumferential portion 14 is a substantially cylindrical member, and a part of its side surface protrudes to which a fluid intake portion 40 is attached. In addition, the outer circumferential portion 14 has three outer circumferential circulation passages 15, through which the fluid supplied from the fluid intake portion 40 passes, which are provided from the connection point with the fluid intake portion 40 to penetrate its inner circumferential surface. The heights and positions of the three outer circumferential circulation passages 15 in a plan view are different from each other.

[0021] The main shaft 20 is connected to the outer periphery 14 by a thrust bearing 21 and is rotatable relative to the outer periphery 14. A lock spacer 22 for connection to the thrust bearing 21 and a holder spacer 12 for connection to the BT holder 13 are provided on the upper part of the main shaft 20. The lock spacer 22 is provided with spacer claws 23 that are concave in plan view to prevent rotation of the main shaft 20 and to position it at its original position. Three fluid flow grooves 24 are provided on the outer periphery of the main shaft 20, offset vertically to correspond to the outer periphery flow passages 15. O-rings 25 are provided above and below each flow groove 24 for sealing. Three main shaft flow passages 26 are provided from each flow groove 24 toward the interior of the main shaft 20. These main shaft flow passages 26 continue to a conversion chuck spacer 30 provided below the main shaft 20.

[0022] As shown in FIG. 3 , the conversion chuck spacer 30 is provided below the main shaft 20. The conversion chuck spacer 30 is connected to the lower thrust bearing 21 to rotatably connect the outer periphery 14 to the main shaft 20, and also serves to mount downstream devices 8 such as a hand chuck 8. Three chuck flow passages 31 corresponding to the main shaft flow passage 26 are also provided inside the conversion chuck spacer 30. Two of the three chuck flow passages 31 are connected to two pipes, a first pipe 32 and a second pipe 33, for driving the hand chuck 8, and fluid for driving the hand chuck 8 is supplied through these pipes. A third pipe 34 is connected to the other chuck flow passage 31, and in this embodiment, this third pipe 34 is used for blowing air using an air nozzle 35. However, the use of the third pipe 34 is not limited to air blowing and can also be used for other purposes, such as workpiece detection.

[0023] Next, a description will be given of the configuration of the fluid intake section 40. The fluid intake section 40 includes a guide shaft 50, an elastic body 42, and a block main body 41.

[0024] The guide shaft 50 includes a tubular shaft portion 51, a shaft flange portion 52, and a shaft flow passage 53. The guide shaft 50 is configured to be movable up and down a predetermined distance while fitted into a guide hole 60. The tubular shaft portion 51 is a cylindrical member through which a shaft flow passage 53 for passing a fluid in the axial direction is provided. The shaft flange portion 52 is provided midway along the axial direction of the tubular shaft portion 51, and protrudes from the periphery of the tubular shaft portion 51 in a flange-like manner. One end 54 of the guide shaft 50 protrudes from the side of the block main body 41 facing the fluid supply port 4 to be connected to the fluid supply port 4. A dovetail-shaped recess 56 is provided in the one end 54 of the guide shaft 50 (enlarged view in the upper part of FIG. 4), and an O-ring 57 is fitted into this recess 56 for sealing. The other end 55 of the guide shaft 50 is fitted into a guide hole 60 provided in the block main body 41. As shown in the enlarged view at the bottom of FIG. 4, an O-ring 58 may also be attached to the side surface of the lower part of the guide shaft 50.

[0025] In this embodiment, a coil spring 42 is used as the elastic body 42. The coil spring 42 biases the guide shaft 50 toward the fluid supply port 4 with a predetermined force. The predetermined force is sufficient as long as it overcomes the weight of the guide shaft 50 itself and the sliding resistance between the guide shaft 50 and the guide hole 60, and is sufficient to hold one end 54 of the guide shaft 50 protruding from the block main body 41 and overcome the resistance generated when the periphery of the guide shaft 50 rubs against the inner periphery of the fluid supply port 4 when the one end 54 of the guide shaft 50 is inserted to connect it to the fluid supply port 4. The diameter of the coil spring 42 is such that the shaft tube portion 51 of the guide shaft 50 fits loosely and only abuts against the shaft flange portion 52, but does not pass through. Note that only one coil spring 42 is shown in FIGS. 1, 3, and 4 to clearly show the configuration of each part. The elastic body 42 is not limited to a coil spring; a rubber bushing or other spring may be used.

[0026] The block main body 41 includes a guide hole 60, a block lower portion 70, a piston portion 80, and a lid portion 84.

[0027] The guide hole 60 is provided on the side of the block main body 41 facing the fluid supply port 4, and is a hole into which the guide shaft 50 is fitted. The guide hole 60 includes a block guide hole 61, a shaft storage chamber 62, and a piston guide hole 63. The configuration of each of these guide holes 60 will be described later in the description of the block lower part 70 and the piston part 80.

[0028] The block lower portion 70 is attached to the side surface of the outer peripheral portion 14 of the holder main body 10 and includes three block guide holes 61, a block flow passage 71, and a pressure chamber 72. The block guide hole 61 is configured to slidably receive the shaft tubular portion 51 of the guide shaft 50. The diameter of the block guide hole 61 is such that only the shaft tubular portion 51 can be inserted, and the shaft flange portion 52 and the elastic body 42 cannot. The block flow passages 71 are three passages that connect the bottom of the block guide hole 61 to the outer peripheral flow passage 15 provided in the outer peripheral portion 14, and allow fluid to pass through. Three pressure chambers 72 are provided, and are spaces provided between the bottom surface 5 of the block guide hole 61 and the other end 55 of the guide shaft 50. The pressure chambers 72 store the fluid supplied from the fluid supply port 4 and flowing through the shaft flow passage 53, and the fluid pressure presses the guide shaft 50 against the fluid supply port 4.

[0029] Here, with reference to FIG. 5 , another embodiment of the guide shaft 150 and the pressure chamber 172 will be described. As shown in FIG. 5 , the guide shaft 150 of this embodiment has an expanded diameter shaft portion 159 at the other end 155 on the side disposed in the pressure chamber 172. The pressure chamber 172 is also configured to have a larger diameter to match the expanded diameter shaft portion 159. Furthermore, a pressure release path 173 is provided in the pressure chamber 172 at a location above the expanded diameter shaft portion 159, for releasing pressure changes in the pressure chamber 172 caused by the up and down movement of the guide shaft 150 to the atmosphere or the like. With this configuration, the area ar2 of the other end 155 of the guide shaft 150 disposed in the pressure chamber 172 is larger than the area ar1 of the one end 154 connected to the fluid supply port 4. As a result, the fluid supplied from the fluid supply port 4 accumulates in the pressure chamber 172, and the resulting pressure presses the one end 154 of the guide shaft 150 strongly against the fluid supply port 4. In this embodiment, even if the elastic body 42 is not provided, fluid leakage will not occur.

[0030] 1 to 4 , the piston portion 80 includes a piston column portion 81, a shaft storage chamber 62, a piston guide hole 63, a piston flange portion 82, and a piston claw portion 83, and is configured to be able to move up and down a predetermined distance. The piston column portion 81 is a columnar member with its tip protruding from a lid portion 84. The shaft storage chamber 62 is a space provided inside the piston column portion 81, and the shaft flange portion 52 and the shaft tube portion 51 are configured to be able to move up and down therein. The coil spring 42, loosely fitted in the shaft tube portion 51, is also stored in the shaft storage chamber 62. One end 54 of the coil spring 42 abuts against the shaft flange portion 52, and the other end 55 abuts against the block lower portion 70. The piston guide hole 63 is provided on the fluid supply port 4 side of the shaft storage chamber 62, and is configured with a diameter that allows only the shaft tube portion 51 to pass through. 3 is in a free state, the shaft flange 52 abuts against the boundary between the shaft storage chamber 62 and the piston guide hole 63 and is prevented from moving any further upward. The piston flange 82 is a flange-shaped member configured around the lower part of the piston column 81 and has a diameter larger than that of the piston column 81. The piston claws 83 are convex in plan view, with the part of the piston flange 82 that protrudes further toward the holder main body 10, and are configured to fit between the spacer claws 23 of the lock spacer 22.

[0031] The lid portion 84 includes a piston storage chamber 85 and a lid hole 86, and is attached to the block lower portion 70. The piston storage chamber 85 is provided within the lid portion 84, and is a space within which the piston flange 82 and piston column 81 are able to move up and down. The lid hole 86 communicates with the piston storage chamber 85, is provided closer to the fluid supply port 4 than the piston storage chamber 85, and has a diameter that allows only the piston column 81 to pass through. Therefore, when the piston portion 80 is in a free state as shown in FIG. 3, the piston flange 82 abuts against the boundary between the piston storage chamber 85 and the lid hole, preventing it from moving further upward. In addition, a window (not shown) is provided in the lid portion 84 on the holder main body 10 side, through which the piston claw 83 protrudes.

[0032] As explained above, the fluid supply holder 1 of this embodiment is configured such that the flow path including the block flow path 71, the shaft flow path 53, and the pressure chamber 72, etc., includes a first flow path 90 and a second flow path 91 for driving the downstream device 8, as well as a spare third flow path 92.

[0033] Next, the operation of the fluid supply holder 1 will be described with reference to FIGS. 1 to 4, taking into account the various components of the fluid supply holder 1 of this embodiment described above. The fluid supply holder 1 of this embodiment is stored in an automatic tool changer (ATC) of a machining center (not shown). It is removed from the ATC and attached to the main spindle 2 as needed. FIG. 3 shows the fluid supply holder 1 before it is attached to the main spindle 2. In this state, the coil spring 42 pushes up the shaft flange 52 of the guide shaft 50 with its biasing force, and the shaft flange 52 in turn pushes up the piston 80. As a result, the piston claws 83 are flush with the spacer claws 23, and the piston claws 83 fit into the recesses of the spacer claws 23. This maintains the rotational position of the main shaft 20 at its original position. The shank 11 is not shown in FIG. 3.

[0034] Next, as shown in Figure 1, when the fluid supply holder 1 is attached to the main spindle 2 of the machining center, the guide shaft 50 is pushed down by the fluid supply port 4. This causes one end 54 of the guide shaft 50 to abut against the fluid supply port 4. Furthermore, the piston portion 80 is also pushed down by the bottom surface 5 of the fluid supply block 3. This releases the engagement between the piston claw portion 83 and the spacer claw portion 23, allowing the main shaft 20 to rotate freely.

[0035] Next, fluid is supplied through the supply flow passage 7 from a fluid supply source (not shown) provided upstream of the fluid supply port 4. As shown in the enlarged view at the bottom of FIG. 4 , fluid pressure builds up in the pressure chamber 72, pushing up the other end 55 of the guide shaft 50. Then, as shown in the enlarged view at the top of FIG. 4 , one end 54 of the guide shaft 50 is pressed against the fluid supply port 4. Even if the guide shaft 50 were to descend and the one end 54 of the guide shaft 50 were to separate from the fluid supply port 4, there would be a slight gap s of about 0.5 mm between the guide shaft 50 and the inner circumferential wall 6 of the fluid supply port 4. Therefore, any leaked fluid would be discharged through the gap s and would not press against the one end 54 of the guide shaft 50. Even if there were no gap s and the leaked fluid pressed against the one end 54 of the guide shaft 50, a force from the pressure chamber 72 would be applied to the other end 55 of the guide shaft 50, and the force pushing against the guide shaft 50 would be balanced by the fluid pressure. When the biasing force of the coil spring 42 is applied to this, one end 54 of the guide shaft 50 is eventually pressed against the fluid supply port 4 .

[0036] As described above, with the fluid supply holder 1 of this embodiment, the one end 54 of the guide shaft 50 is pressed against the fluid supply port 4 by the fluid pressure, so fluid leakage does not occur even when the fluid pressure is increased. Furthermore, there is no need to use an elastic body 42 with particularly strong repulsive force. Therefore, the one end 54 of the guide shaft 50 can be connected to the fluid supply port 4 with a weak force. Furthermore, when the guide shaft 50 is pressed against the fluid supply port 4 by the fluid pressure, the one end 54 of the guide shaft 50 is already in contact with the fluid supply port 4, so it is not subjected to impacts such as those caused by hitting it with a hammer. These factors reduce wear and damage to the O-ring 57 attached to the guide shaft 50 and the fluid supply port 4. Furthermore, the principle of using the fluid pressure to press the guide shaft 50 against the fluid supply port 4 allows for a simple configuration, making the device less susceptible to breakdowns and requiring less frequent maintenance.

[0037] Furthermore, the guide shafts 50 are individually movable in the vertical direction, separately from the piston portion 80. Therefore, even if the depth dimension of the fluid supply port 4 is not strictly determined, the fluid supply port 4 and one end 54 of the guide shaft 50 can always be in contact with each other, and a good seal can be maintained between one end 54 of the guide shaft 50 and the fluid supply port 4. For example, the O-ring 57 provided at one end 54 of the guide shaft 50 deteriorates over time, causing changes in its dimensions and elasticity. Furthermore, the O-rings 57 of the three guide shafts 50 do not deteriorate in the same manner, resulting in individual differences. Even in such cases, because the guide shafts 50 are individually movable, a seal can always be maintained between one end 54 of the guide shaft 50 and the fluid supply port 4.

[0038] The above-described fluid supply holder is an example of the present invention, and its configuration can be appropriately changed without departing from the spirit of the invention. [Explanation of symbols]

[0039] 1 fluid supply holder, 2 spindle, 3 fluid supply block, 4 fluid supply port, 5 bottom surface, 6 inner peripheral wall, 7 supply flow passage, 8 downstream device (hand chuck), 10...Holder body portion, 11...Shank, 12...Holder spacer, 13...BT holder, 14...Outer periphery portion, 15...Outer periphery flow passage, 20 ·· Main shaft, 21 ·· Thrust bearing, 22 ·· Lock spacer, 23 ·· Spacer claw portion, 24 ·· Flow groove, 25 ·· O-ring, 26 ·· Main shaft flow passage, 30: Conversion chuck spacer; 31: Chuck flow passage; 32: First piping; 33: Second piping; 34: Third piping; 35: Air nozzle; 40: Fluid intake portion; 41, 141: Block main body; 42: Elastic body (coil spring); 50, 150··Guide shaft, 51··Shaft cylindrical portion, 52··Shaft flange portion, 53, 153··Shaft flow passage, 54, 154··One end portion, 55, 155··Other end portion, 56, 156··Recess, 57, 58, 157··O-ring, 159··Shaft enlarged diameter portion, 60,160··Guide hole, 61··Block guide hole, 62··Shaft storage chamber, 63··Piston guide hole, 70··Lower part of block, 71··Block flow passage, 72, 172··Pressure chamber, 173··Pressure release passage, 80 Piston portion, 81 Piston column portion, 82 Piston flange portion, 83 Piston claw portion, 84·· Lid portion, 85·· Piston storage chamber, 86·· Lid hole portion, 90··First distribution channel, 91··Second distribution channel, 92··Third distribution channel,

Claims

1. A fluid supply holder that is attached to a spindle of a machining center and relays fluid supplied from a fluid supply port provided adjacent to the spindle to supply the fluid to a downstream device, a holder main body to which a shank that is detachable from the spindle is attached; a fluid intake portion provided on a side surface of the holder main body portion, The fluid intake portion is a block body portion attached to the holder body portion, the block body portion including one or more guide holes provided on a side opposite the fluid supply port and a block flow passage communicating with a bottom of the guide hole and through which a fluid passes; a guide shaft that is fitted into the guide hole and is slidable within the guide hole, and that has a shaft flow passage that penetrates the guide hole in its axial direction and allows a fluid to pass through, and one end of the guide shaft is connected to the fluid supply port; a pressure chamber for storing the fluid supplied from the fluid supply port between the bottom surface of the guide hole and the other end of the guide shaft and for pressing the guide shaft against the fluid supply port by the pressure of the fluid; 1. A fluid supply holder comprising:

2. 2. The fluid supply holder according to claim 1, further comprising an elastic body that pre-biases the guide shaft toward the fluid supply port with a predetermined force.

3. the guide shaft includes a cylindrical shaft portion that is a cylindrical member, and a shaft flange portion that is provided around the cylindrical shaft portion and against which an end of the elastic body abuts, the block main body includes a block lower portion attached to the holder main body portion, and a piston portion and a lid portion provided on a side of the block lower portion facing the fluid supply port, the lower part of the block has a block guide hole into which the cylindrical shaft part is inserted, the piston portion comprises a piston pillar portion which is a pillar-shaped member, a shaft accommodating chamber provided inside the piston pillar portion, allowing the shaft flange portion to move therein and accommodating the elastic body, a piston guide hole which communicates with the shaft accommodating chamber and is provided on the fluid supply port side, allowing only the shaft cylindrical portion to pass through, and a piston flange portion provided around the piston pillar portion, 3. The fluid supply holder according to claim 2, wherein the lid portion comprises a piston storage chamber within which the piston flange is movable, and a lid hole portion that communicates with the piston storage chamber and is provided on the side of the fluid supply port, through which only the piston column portion can pass.

4. 2. The fluid supply holder according to claim 1, wherein the area of one end of the guide shaft, which is connected to the fluid supply port, is larger at the other end that is positioned in the pressure chamber.

5. 5. A fluid supply holder as described in any one of claims 1 to 4, wherein the fluid flow path including the block flow path, the shaft flow path, and the pressure chamber includes a first flow path and a second flow path for driving a downstream device, as well as a spare third flow path.

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