Work holding device

Abstract

The work holding device (1) comprises: a first cylindrical member (15) fixed to the base member (11) with its inner surface facing the outer peripheral surface of the first holding portion (123) via a first elastic member; a first swing regulating portion (21) that restricts movement of the first oscillating member (12) relative to the base member (11) by expanding the first elastic member and pressing the entire outer surface of the first elastic member against the inner surface of the first cylindrical member (15); a second cylindrical member (16) that is fixed to the first oscillating member (12) with its inner surface facing the outer peripheral surface of the second holding portion (133) via a second elastic member; and a second swing regulating portion (22) that restricts movement of the second oscillating member (13) relative to the first oscillating member (12) by expanding the second elastic member and pressing the entire outer surface of the second elastic member against the inner surface of the second cylindrical member (16).

Description

Technical Field

[0001] The present invention relates to a work holding device.

Background Art

[0002] There has been proposed a floating jig including a jig base, a first swing member having a first swing shaft extending in a first direction and supported by the jig base so as to swing about the first swing shaft, a second swing member having a second swing shaft extending in a second direction orthogonal to the first direction and supported by the first swing member so as to swing about the second swing shaft, and a work holder fixed to the second swing member for holding the work (see, for example, Patent Document 1). In this floating jig, a plurality of first actuators arranged so as to surround the first swing shaft and fixed to the jig base respectively press the first swing shaft in a direction toward the axis of the first swing shaft, thereby restricting the swing of the first swing shaft. Further, a plurality of second actuators arranged so as to surround the second swing shaft and fixed to the first swing member respectively press the second swing shaft in a direction toward the axis of the second swing shaft, thereby restricting the swing of the second swing shaft.

[0003] By the way, when an operation of fixing the posture of the first swing member is performed by a plurality of first actuators, if the pressing forces of the plurality of first actuators act on the first swing shaft in an unbalanced manner, there is a risk that the posture of the first swing member will be displaced. Further, when an operation of fixing the posture of the second swing member is performed by a plurality of second actuators, if the pressing forces of the plurality of second actuators act on the second swing shaft in an unbalanced manner, there is a risk that the posture of the second swing member will be displaced. Therefore, in the configuration described in Patent Document 1, load sensors are provided on the first swing shaft and the second swing shaft, and control is executed to reduce the imbalance of the pressing forces between the plurality of first actuators and between the plurality of second actuators based on the detection results of the load sensors.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-131345 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] However, the configuration described in Patent Document 1 requires load sensors to detect the pressing force of each of the multiple first actuators and multiple second actuators, and a control device that performs control to reduce the imbalance in pressing force between the multiple first actuators and between the multiple second actuators based on the detection results of the load sensors. As a result, the device configuration becomes complex, and there is a risk that the weight will increase due to the increase in the number of parts.

[0006] This invention has been made in view of the above reasons, and aims to provide a workpiece holding device that can be simplified in structure and made lighter. [Means for solving the problem]

[0007] To achieve the above objective, the workpiece holding device according to the present invention is Base member and A first oscillating member having: a first main body portion supported by the base member so as to be movable in at least one direction between a direction of oscillation around a first oscillating axis extending in a first direction and the direction of the first oscillating axis; and a first holding portion which is disc-shaped, fixed to the first main body portion in a position in which its central axis coincides with the first oscillating axis, and which holds an annular first elastic member on its entire outer surface; The second rocking member has a second main body portion that is supported by the first rocking member so as to be movable in at least one direction between the direction in which it rocks and the direction in which it moves in a second direction perpendicular to the first direction and the direction in which it moves in the second rocking axis, and a second holding portion that is disc-shaped and fixed to the second main body portion in a position in which its central axis coincides with the second rocking axis, and which holds an annular second elastic member on its entire outer surface, A work holder fixed to the second main body and holding the workpiece, A first cylindrical member is fixed to the base member such that it is cylindrical and has a circular cross-sectional shape at least perpendicular to the inner cylindrical axis, and its inner surface faces the outer circumferential surface of the first holding member via the first elastic member, A first oscillation restricting part restricts the movement of the first oscillation member relative to the base member by expanding the first elastic member and pressing the entire outer surface of the first elastic member against the inner surface of the first cylindrical member, A second cylindrical member is fixed to the first rocking member in a cylindrical shape, with a circular cross-sectional shape at least perpendicular to the inner cylindrical axis, and its inner surface faces the outer surface of the second holding member via the second elastic member. The device includes a second oscillation restricting portion that restricts the movement of the second oscillation member relative to the first oscillation member by expanding the second elastic member and pressing the entire outer surface of the second elastic member against the inner surface of the second cylindrical member. [Effects of the Invention]

[0008] According to the present invention, the first oscillation restricting part restricts the movement of the first oscillation member relative to the base member by expanding the first elastic member and pressing the entire outer surface of the first elastic member against the inner surface of the first cylindrical member. Similarly, the second oscillation restricting part restricts the movement of the second oscillation member relative to the first oscillation member by expanding the second elastic member and pressing the entire outer surface of the second elastic member against the inner surface of the second cylindrical member. As a result, the first holding portion of the first oscillation member is fixed to the first cylindrical member with uniform pressure over its entire circumferential direction, and the second holding portion of the second oscillation member is fixed to the second cylindrical member with uniform pressure over its entire circumferential direction. Therefore, it is possible to simplify the structure and reduce weight while suppressing displacement of the orientation of the first and second oscillation members. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view of a honing apparatus according to Embodiment 1 of the present invention. [Figure 2]This is a partially broken perspective view of the workpiece holding device according to Embodiment 1. [Figure 3A] This is a cross-sectional view of the workpiece holding device according to Embodiment 1, broken along line AA in Figure 2. [Figure 3B] This is a cross-sectional view of the workpiece holding device according to Embodiment 1, broken along the line BB in Figure 2. [Figure 4A] This is a partial cross-sectional view showing the workpiece holding device according to Embodiment 1 in a state where the workpiece holding has been released. [Figure 4B] This is a partial cross-sectional view showing a state in which a workpiece has been detached from the workpiece holding device according to Embodiment 1. [Figure 5A] This is a partial cross-sectional view showing the workpiece holding device according to Embodiment 1 in a state where it is not holding a workpiece. [Figure 5B] This is a partial cross-sectional view showing the workpiece holding device according to Embodiment 1 in a state where it is holding a workpiece. [Figure 6] This is a schematic diagram of the first oscillation restricting unit and the second oscillation restricting unit according to Embodiment 1. [Figure 7A] This is a partial cross-sectional view showing the swingable state of the workpiece holding device according to Embodiment 1. [Figure 7B] This is a partial cross-sectional view showing the vibration damping state of the workpiece holding device according to Embodiment 1. [Figure 8] This is a partially broken perspective view of the workpiece holding device according to Embodiment 2. [Figure 9A] This is a cross-sectional view of the workpiece holding device according to Embodiment 2, broken along the CC line in Figure 8. [Figure 9B] This is a cross-sectional view of the workpiece holding device according to Embodiment 2, broken along the line DD in Figure 8. [Figure 10] This is a schematic diagram of the first oscillation restricting unit and the second oscillation restricting unit according to Embodiment 1. [Figure 11A] This is a partial cross-sectional view showing the swingable state of the workpiece holding device according to Embodiment 2. [Figure 11B] This is a partial cross-sectional view showing the vibration damping state of the workpiece holding device according to Embodiment 2. [Figure 12]It is a schematic configuration diagram of a swing control unit according to a modified example.

Embodiment for Implementing the Invention

[0010] (Embodiment 1) Hereinafter, a work holding device according to an embodiment of the present invention will be described with reference to the drawings. The work holding device according to this embodiment is a jig for holding a work during honing. This work holding device includes a base member, a first swing member, a second swing member, a work holder, a first cylindrical member, a first swing restricting portion, a second cylindrical member, and a second swing restricting portion. The first swing member is supported by the base member so as to be movable at least in one of a direction of swinging about a first swing axis extending in a first direction and a direction of the first swing axis. The first swing member includes a first main body portion and a first holding portion. The first main body portion is supported by the base member so as to be movable at least in one of a direction of swinging about a first swing axis extending in a first direction and a direction of the first swing axis. The first holding portion is disk-shaped and has a central axis that coincides with the first swing axis. The first holding portion is fixed to the first main body portion and holds a first elastic member in an annular shape over the entire outer peripheral surface. The second swing member includes a second main body portion and a second holding portion. The second main body portion is supported by the first swing member so as to be movable at least in one of a direction of swinging about a second swing axis extending in a second direction orthogonal to the first direction and a direction of the first swing axis. The second holding portion is disk-shaped and has a central axis that coincides with the second swing axis. The second holding portion is fixed to the second main body portion and holds a second elastic member in an annular shape over the entire outer peripheral surface. The work holder is fixed to the second main body portion of the second swing member and holds the work. The first cylindrical member is cylindrical and has a circular cross-sectional shape at least orthogonal to the inner cylindrical axis direction. The inner surface of the first cylindrical member is fixed to the base member in a state where it faces the outer peripheral surface of the first holding member via the first elastic member. The first swing restricting portion restricts the movement of the first swing member with respect to the base member by expanding the first elastic member and pressing the entire outer side of the first elastic member against the inner surface of the first cylindrical member. The second cylindrical member is cylindrical and has a circular cross-sectional shape at least orthogonal to the inner cylindrical axis direction. The inner surface of the second cylindrical member is fixed to the first swing member in a state where it faces the outer peripheral surface of the second holding member via the second elastic member. The second swing restricting portion restricts the movement of the second swing member with respect to the first swing member by expanding the second elastic member and pressing the entire outer side of the second elastic member against the inner surface of the second cylindrical member.

[0011] As shown in Figure 1, the honing apparatus according to this embodiment comprises a honing tool 90 and a workpiece holding device 1 positioned vertically below the honing tool 90. The honing apparatus also includes a drive mechanism (not shown) that moves the honing tool 90 up and down while rotating it along its longitudinal direction about its central axis J2. In Figure 1, the workpiece W is positioned such that the central axis J0 of its processed hole Wh coincides with the central axis J1 of the honing tool 90.

[0012] The honing tool 90 comprises a long cylindrical tool body 91 and a plurality of grinding wheels 92 provided at the -Z end of the tool body 91 so as to be expandable and contractible radially with respect to the tool body 91. The honing tool 90 also has a wedge portion (not shown) provided at the -Z end, and is positioned inside the tool body 91 with the wedge portion in contact with the inclined surface opposite to the grinding wheels 92 of a grinding wheel holder (not shown) to which the grinding wheels 92 are fixed. The wedge rod (not shown) is used to expand the grinding wheels 92 by moving relative to the tool body 91 in a vertical direction, and a biasing member (not shown) is used to bias the grinding wheels 92 in a contracting direction. As the wedge rod moves in the -Z direction, the grinding wheel holder and the grinding wheels 92 fixed to the grinding wheel holder are pressed against the wedge portion and move in the expansion direction. On the other hand, when the wedge rod moves in the +Z direction, the biasing force of the biasing member causes the grinding wheel holder and the grinding wheels 92 to move in the contraction direction. Furthermore, a ring spring, a ring-shaped rubber, or the like can be used as the biasing member.

[0013] Here, the honing apparatus inserts the honing tool 90 into the machining hole Wh of the workpiece W held by the workpiece holding device 1, and then expands and moves the grinding wheel 92 so that the grinding wheel 92 comes into contact with the inner wall of the machining hole Wh. With the grinding wheel 92 in contact with the inner wall of the machining hole Wh, the honing apparatus grinds the inner wall of the machining hole Wh of the workpiece W by rotating the honing tool 90 about its central axis J2 along its longitudinal direction.

[0014] The workpiece holding device 1 comprises a base member 11, a first oscillating member 12, a second oscillating member 13, a workpiece holder 14, a first cylindrical member 15, a second cylindrical member 16, a first elastic member 17, a second elastic member 18, and a spacer 19. The workpiece holding device 1 also comprises a first oscillating restricting part 21 that restricts the oscillating motion of the first oscillating member 12 relative to the base member 11 and its horizontal movement, and a second oscillating restricting part 22 that restricts the oscillating motion of the second oscillating member 13 relative to the first oscillating member 12 and its horizontal movement. The base member 11 comprises a frame-shaped main body portion 111, support columns 112 that extend in the -Z direction from multiple locations in the circumferential direction of the main body portion 111 and support the main body portion 111, and a base 113 that has a flat shape that is roughly rectangular in plan view and to which the ends of the multiple support columns 112 on the -Z direction side are fixed.

[0015] The first oscillating member 12 is supported by the base member 11 so as to be movable in a direction in which it oscillates around a first oscillating axis Jx that extends in the X-axis direction and in the direction of the first oscillating axis Jx. The first oscillating member 12 has a frame-shaped main body portion 121 having a hexagonal shape in plan view, a long shaft 122 with one end in the longitudinal direction fixed to the first main body portion 121, and a disc-shaped first holding portion 123 fixed to the other end of the shaft 122 and holding the first elastic member 17. The first elastic member 17 is annular and is made of an elastic material such as rubber or elastomer. The main body portion 121 is supported by the base member 11 so as to be movable in a direction in which it oscillates around a first oscillating axis Jx that extends in the X-axis direction and in the direction of the first oscillating axis Jx via the shaft 122. The shaft 122 is fixed to the main body portion 111 of the base member 11 via a bearing 125. The first holding portion 123 is fixed to the main body portion 121 in a position where its central axis along its thickness direction coincides with the first pivot axis Jx, and holds the first elastic member 17 with its entire outer surface. Here, the first holding portion 123 is formed in a continuous and integral manner with the shaft 122 and is fixed to the main body portion 121 via the shaft 122.

[0016] Furthermore, as shown in Figure 3A, a flow channel 122a is formed inside the shaft 122, extending along the longitudinal direction of the shaft 122, i.e., along the X-axis direction. A connector 124 is provided on the portion of the shaft 122 that is fixed to the main body 121, and a flow channel 124a is formed therein, which communicates with the inside of the flow channel 122a from the +Z direction side of the main body 121 and introduces air into the flow channel 122a. In addition, the first retaining portion 123 has a first groove 123a formed over the entire circumferential direction on its outer surface into which the first elastic member 17 is fitted. The first retaining portion 123 is provided with a flow channel 123b that communicates with a first region formed between the first elastic member 17 and the inside of the first groove 123a when the first elastic member 17 is fitted into the first groove 123a.

[0017] As shown in Figure 2, the second oscillating member 13 is supported by the first oscillating member 12 so as to be movable in a direction that allows it to oscillate around the second oscillating axis Jy, which extends in the Y-axis direction, and in the direction of the second oscillating axis Jy. The second oscillating member 13 has a main body portion 131, a long shaft 132 with one end in the longitudinal direction fixed to the main body portion 131, and a disc-shaped second holding portion 133 fixed to the other end of the shaft 132 for holding the second elastic member 18. A guide roller 32 for guiding the rotational movement of the spacer lock plate 144, which will be described later, is also fixed to the second oscillating member 13. The second elastic member 18, like the first elastic member 17, is annular in shape and is made of an elastic material such as rubber or elastomer. The main body portion 131 has a plate-shaped main piece 1311 and two retaining pieces 1312 that extend from both ends of the main piece 1311 in the Y-axis direction in the same direction along the thickness direction of the main piece 1311 and hold the main piece 1311 from the +Z direction side. The main piece 1311 has a through hole 131a that penetrates in its thickness direction and into which a work holder 14 is positioned. In addition, a stepped portion 131b is formed on the inner wall of the through hole 131a, into which a part of the work holder 14 is locked from the -Z direction side. The shaft 132 is fixed to the main body portion 121 of the first oscillating member 12 via a bearing 135, and one end in the longitudinal direction is fixed to the retaining piece 1312 of the main body portion 131. In this way, the main body 131 is supported by the first oscillating member 12 so as to be movable in a direction that oscillates around a second oscillating axis Jy extending in the Y-axis direction via the shaft 132, and in the direction of the second oscillating axis Jy. The second holding portion 133 is fixed to the main body 131 in a position where its central axis along its thickness direction coincides with the second oscillating axis Jy, and holds the second elastic member 18 with its entire outer surface. Here, the second holding portion 133 is formed continuously and integrally with the shaft 132 and is fixed to the main body 131 via the shaft 132.

[0018] Furthermore, as shown in Figure 3B, a flow channel 132a is formed inside the shaft 132, extending along the longitudinal direction of the shaft 122, i.e., along the Y-axis direction. A connector 134 is provided on the portion of the shaft 132 that is fixed to the main body 131, and a flow channel 134a is formed therein, which communicates with the inside of the flow channel 132a from the +Z direction side of the main body 131 and introduces air into the flow channel 132a. In addition, the second retaining portion 133 has a second groove 133a formed over the entire circumferential direction on its outer surface into which the second elastic member 18 is fitted. The second retaining portion 133 is provided with a flow channel 133b that communicates with a second region formed between the second elastic member 18 and the inside of the second groove 133a when the second elastic member 18 is fitted into the second groove 133a.

[0019] As shown in Figures 2, 3A, and 3B, the work holder 14 includes a cylindrical holder body 141, a cylindrical work support portion 142 positioned on the +Z side of the holder body 141 and supporting the workpiece W from the -Z side, a biasing member 143, and two spacer lock plates 144. The holder body 141 has a cylindrical main portion 1411 with a stepped portion 141a formed on the inside for locking the biasing member 143 which is fitted in from the +Z side, an outer flange portion 1412 protruding outward from the +Z side end of the main portion 1411, and a lock plate support portion 1413 that pivotably supports the spacer lock plates 144. The lock plate support portion 1413 has a cylindrical support body 1413a that is fitted onto the main portion 1411 and is slidable vertically relative to the main portion 1411, two protrusions 1413b that protrude away from each other from two opposing locations in the X-axis direction of the support body 1413a, and shaft portions 1413c provided at the tips of each of the two protrusions 1413b that pivotally support the -Z side end of the spacer lock plate 144. A coil spring 145 is positioned between the outer flange portion 1412 and the lock plate support portion 1413, and when the lock plate support portion 1413 moves toward the +Z direction relative to the main portion 1411, the restoring force of the coil spring 145 biases the lock plate support portion 1413 toward the -Z direction. In addition, a guide pin 31 for guiding the rotational movement of the spacer lock plate 144 is fixed to the holder body 141.

[0020] A tapered portion 142b is formed on the inner wall of the workpiece support portion 142, extending from approximately the center in the Z-axis direction to the end on the +Z direction side, with the diameter increasing towards the +Z direction. Furthermore, a stepped portion 142a is formed on the -Z direction end face of the workpiece support portion 142 to engage with the +Z direction end of the biasing member 143. In addition, an outer flange portion 142c is provided on the -Z direction end of the workpiece support portion 142, which protrudes outward. The biasing member 143 is a coil spring, and is positioned inside the main portion 1411 of the holder body 141 with its -Z direction end engaged with the stepped portion 141a of the holder body 141 and its +Z direction end engaged with the stepped portion 142a of the workpiece support portion 142. Each of the two spacer lock plates 144 is elongated, and at one end in the longitudinal direction, a through hole 144d is provided that penetrates through the thickness direction of the spacer lock plate 144, through which the shaft portion 1413c of the lock support portion 1413 of the holder body 141 is inserted. At the other end of each spacer lock plate 144, a hook 144a is provided to lock the spacer 19 from the +Z direction side when the spacer 19 is placed on the main body portion 131 of the second swinging member 13. The spacer lock plate 144 also has a projection 144c that protrudes on the side opposite to the holder body 141, and a tapered portion 144b that slopes away from the holder body 141 from the end through which the through hole 144d is provided to the other end. Then, as shown in Figure 3A, with the spacer lock plate 144 locked to the spacer 19, the aforementioned guide pin 31 comes into contact with the top of the projection 144c, restricting the rotation of the spacer lock plate 144. Then, from the state shown in Figure 3A, as shown by arrow AR31 in Figure 4A, when the lock support portion 1413 is slid toward the +Z direction relative to the holder body 141, the coil spring 145 is compressed, and the position of the tapered portion 144b of the spacer lock plate 144 that comes into contact with the aforementioned guide roller 32 moves toward the end of the tapered portion 144b through which the through hole 144d is provided. Consequently, as shown by arrow AR32, the spacer lock plate 144 rotates in a direction in which the other end separates from the spacer 19. As a result, as shown by arrow AR33 in Figure 4B, the workpiece W and the spacer 19 can be removed toward the +Z direction.

[0021] Here, as shown in Figure 5A, when the workpiece support portion 142 is not holding the workpiece W, the outer flange portion 142c abuts against the stepped portion 131b inside the through hole 131a in the main piece 1311 of the second oscillating member 13 from the -Z direction side and is pressed against the main piece 1311 by the biasing member 143. Then, as shown by arrow AR11 in Figure 5B, when the workpiece W is inserted from the +Z direction side, the -Z direction end of the workpiece W abuts against the tapered portion 142b of the workpiece support portion 142, and the workpiece support portion 142 moves in the -Z direction side. At this time, the workpiece support portion 142 is pressed against the -Z direction end of the workpiece W by the biasing force of the biasing member 143, and the -Z direction end of the workpiece W moves in the XY direction along the tapered portion 142b, thereby aligning the central axis J0 of the workpiece W to coincide with the central axis J2 of the workpiece support portion 142.

[0022] The spacer 19 is disc-shaped and has an opening 19a that penetrates through its center in the thickness direction, through which the workpiece W is inserted. The spacer 19 is placed on the main piece 1311 of the main body 131 of the second oscillating member 13, and is fixed to the second oscillating member 13 by the upper surface of its periphery being locked to the hook 144a of the spacer lock plate 144 of the workpiece holder 14, while the workpiece W, inserted through the opening 19a, is held by the workpiece holder 14.

[0023] As shown in Figures 2 and 3A, the two first cylindrical members 15 are each bottomed cylindrical, having a cylindrical portion 151 and a bottom wall 152 that closes one end of the cylindrical portion 151 in the direction of the cylindrical axis, and at least the cross-sectional shape perpendicular to the inner cylindrical axis is circular. The inner surface of the cylindrical portion 151 of the first cylindrical member 15 is fixed to the base member 11 in a state where it faces the outer circumferential surface of the first holding portion 123 of the first oscillating member 12 via the first elastic member 17. The two second cylindrical members 16 are each bottomed cylindrical, as shown in Figures 2 and 3B, having a cylindrical portion 161 and a bottom wall 162 that closes one end of the cylindrical portion 161 in the direction of the cylindrical axis, and at least the cross-sectional shape perpendicular to the inner cylindrical axis is circular. The inner surface of the cylindrical portion 161 of the second cylindrical member 16 is fixed to the first oscillating member 12 in a state where it faces the outer surface of the second holding portion 133 of the second oscillating member 13 via the second elastic member 18.

[0024] As shown in Figure 6, the first oscillation restricting unit 21 includes an air source 211 that outputs compressed air, a tube 212 connected to the connector 124 of the first oscillation member 12, a connector 215 provided at the tip of the tube 212, a pressure control valve 213 interposed between the air source 211 and the tube 212 to adjust the air pressure inside the tube 212, and a pressure control unit 214. With the connector 215 connected to the connector 124 of the first oscillation member 12, the pressure control unit 214 controls the pressure control valve 213 to adjust the pressure of the air supplied from the air source 211 to the connector 124, thereby restricting the movement of the first oscillation member 12 relative to the base member 11. Furthermore, the second oscillation restricting unit 22 includes an air source 211, a tube 222 connected to the connector 134 of the second oscillation member 13, a connector 225 provided at the tip of the tube 222, a pressure control valve 223 interposed between the air source 211 and the tube 222 for adjusting the air pressure inside the tube 222, and a pressure control unit 214. With the connector 225 connected to the connector 134 of the second oscillation member 13, the pressure control unit 214 controls the pressure control valve 223 to adjust the pressure of the air supplied from the air source 211 to the connector 134, thereby restricting the movement of the second oscillation member 13 relative to the first oscillation member 12.

[0025] For example, as shown in Figure 7A, when the second elastic member 18 is not in contact with the inner surface 161a of the cylindrical portion 161 of the second cylindrical member 16, the second oscillating member 13 is able to swing freely relative to the first oscillating member 12 and move horizontally. When the second oscillating restricting unit 22 restricts the movement of the second oscillating member 13 relative to the first oscillating member 12, it supplies air from the connector 134 through the flow paths 134a, 132a, and 133b to the second region S2 formed between the second elastic member 18 and the inside of the second groove 133a. As a result, as shown by arrow AR12 in Figure 7B, the second elastic member 18 expands, and the entire outer surface of the second elastic member 18 is pressed against the inner surface 161a of the cylindrical portion 161 of the second cylindrical member 16, thereby restricting the movement of the second oscillating member 13 relative to the first oscillating member 12. Furthermore, when the first elastic member 17 is not in contact with the inner surface of the cylindrical portion 151 of the first cylindrical member 15, the first swinging member 12 is swingable relative to the base member 11 and is also movable horizontally. When the first swing restricting unit 21 restricts the movement of the first swinging member 12 relative to the base member 11, it supplies air from the connector 124 shown in Figure 3A through the flow paths 124a, 122a, and 123b to the first region formed between the first elastic member 17 and the inside of the first groove 123a. As a result, the first elastic member 17 expands, and the entire outer surface of the first elastic member 17 is pressed against the inner surface of the cylindrical portion 151 of the first cylindrical member 15, thereby restricting the movement of the first swinging member 12 relative to the base member 11.

[0026] Furthermore, the pressure control unit 214 can change the pressure of the air supplied to the connectors 124 and 134 in stages or continuously by controlling the pressure control valves 213 and 223. This allows the braking force on the base member 11 and the first oscillating member 12 of the first oscillating member 13, respectively, to be adjusted in stages or continuously.

[0027] As described above, in the workpiece holding device 1 according to this embodiment, the first oscillation restricting part 21 restricts the movement of the first oscillation member 12 relative to the base member 11 by expanding the first elastic member 17 and pressing the entire outer surface of the first elastic member 17 against the inner surface of the cylindrical portion 151 of the first cylindrical member 15. In addition, the second oscillation restricting part 22 restricts the movement of the second oscillation member 13 relative to the first oscillation member 12 by expanding the second elastic member 18 and pressing the entire outer surface of the second elastic member 18 against the inner surface 161a of the cylindrical portion 161 of the second cylindrical member 16. As a result, the first holding portion 123 of the first oscillation member 12 is fixed to the first cylindrical member 15 with uniform pressure over its entire circumferential direction, and the second holding portion 133 of the second oscillation member 13 is fixed to the second cylindrical member 16 with uniform pressure over its entire circumferential direction. Therefore, it is possible to simplify the structure and reduce weight while suppressing the displacement of the orientation of the first oscillating member 12 and the second oscillating member 13.

[0028] Furthermore, in the workpiece holding device 1 according to this embodiment, the pressure control valves 213 and 223 can be controlled separately to adjust the pressure applied to the connectors 124 and 125 to different pressures. This makes it possible, for example, to compare the oscillation amplitude and horizontal movement amplitude of the first oscillating member 12 and the second oscillating member 13, and adjust the pressure applied to the connector 124 and 125 provided on the side with the larger amplitude to be greater than the pressure on the other side.

[0029] Incidentally, there is a need to improve production efficiency through so-called continuous processing, in which multiple workpiece holding devices 1 are placed on a conveyor and processed while sequentially arranging them vertically below the honing tool 90. In this case, in the honing machine described in Patent Document 1, if the control unit is located on the machine body side, the control unit must be configured to control multiple first actuators and multiple second actuators, for example, by wireless communication, which complicates the configuration of the honing machine. In contrast, in the workpiece holding device 1 according to this embodiment, the workpiece holding device 1 positioned vertically below the honing tool 90 can be replaced simply by connecting the connectors 124 and 134 to and detaching them from the connectors 215 and 225 provided at the ends of the tubes 212 and 222 of the first and second oscillation restricting units 21 and 222, respectively. Therefore, if the workpiece holding device 1 is configured to be replaced automatically, it is only necessary to provide a mechanism for automatically attaching and detaching connectors 215 and 225 to connectors 124 and 134, thus simplifying the configuration of the honing apparatus or conveyor equipped with the honing tool 90.

[0030] Furthermore, in the workpiece holding device 1 according to this embodiment, the first oscillating member 12 and the second oscillating member 13 are equipped with a braking mechanism for the first oscillating member 12 and the second oscillating member 13, respectively, using a first elastic member 17 and a second elastic member 18 at both ends in the X-axis and Y-axis directions. As a result, the braking mechanism can be made compact and lightweight, making it possible to perform honing while rotating the honing tool 90 at high speed.

[0031] Furthermore, the first oscillation restricting unit 21 according to this embodiment introduces air into a first region formed between the first elastic member 17 and the inside of the first groove 123a of the first holding part 123 of the first oscillation member 12 through a flow path 123b formed in the first holding part 123 of the first oscillation member 12, thereby expanding the first elastic member 17 in a direction perpendicular to the first oscillation axis Jx and away from the first oscillation axis Jx with air pressure. Furthermore, the second oscillation restricting unit 22 introduces air into a second region S2 formed between the second elastic member 18 and the inside of the second groove 133a of the second holding part 133 of the second oscillation member 13 through a flow path 133b formed in the second holding part 133 of the second oscillation member 13, thereby expanding the second elastic member 18 in a direction perpendicular to the second oscillation axis Jy and away from the second oscillation axis Jy with air pressure. This allows air pressure to be applied uniformly to the first elastic member 17 and the second elastic member 18, thereby enabling them to expand uniformly and without bias in their circumferential directions.

[0032] Furthermore, the work holder 14 according to this embodiment includes a holder body 141 in which a workpiece W is placed inside, a work support portion 142 that supports the workpiece W in contact with the workpiece W from the insertion direction side of the workpiece W relative to the holder body 141, i.e., the -Z direction side, and a biasing member 143 fixed to the holder body 141 and biasing the work support portion 142 in the +Z direction. As a result, the work support portion 142 is pressed against the -Z direction end of the workpiece W by the biasing force of the biasing member 143, and the -Z direction end of the workpiece W moves in the XY direction along the tapered portion 142b, thereby aligning the central axis J0 of the workpiece W to coincide with the central axis J2 of the work support portion 142. Therefore, the positional variation of the machining hole Wh of the workpiece W when setting the workpiece W in the work holder 14 can be reduced. In particular, it is possible to suppress positional variations in the machined holes Wh of the workpiece W that exceed the movement limits of the first oscillating member 12 and the second oscillating member 13, and to ensure that the movable distance of the first oscillating member 12 and the second oscillating member 13 is secured, thereby improving machining accuracy.

[0033] (Embodiment 2) The workpiece holding device according to this embodiment differs from Embodiment 1 in that it comprises a first holding member which is cylindrical and has a circular cross-sectional shape perpendicular to at least the inner cylindrical axis direction, and which holds an annular first elastic member on the inside, and a second holding member which is cylindrical and has a circular cross-sectional shape perpendicular to at least the inner cylindrical axis direction, and which holds an annular second elastic member on the inside.

[0034] As shown in Figure 8, the workpiece holding device 2 according to this embodiment comprises a base member 11, a first oscillating member 2012, a second oscillating member 2013, a workpiece holder 14, a first holding member 2015, a second holding member 2016, first elastic members 17 and 18, and a spacer 19. In Figure 8, components similar to those in Embodiment 1 are denoted by the same reference numerals as in Figure 2. The workpiece holding device 2 also comprises a first oscillating restricting unit 2021 that restricts the oscillating and horizontal movement of the first oscillating member 2012 relative to the base member 11, and a second oscillating restricting unit 2022 that restricts the oscillating and horizontal movement of the second oscillating member 2013 relative to the first oscillating member 2012.

[0035] The first oscillating member 2012 is supported by the base member 11 so as to be movable in a direction that allows it to oscillate around a first oscillating axis Jx extending in the X-axis direction and in the direction of the first oscillating axis Jx. The first oscillating member 2012 has a frame-shaped main body portion 121, a long shaft 2122 with one end in the longitudinal direction fixed to the main body portion 121, and a disc-shaped first disc-shaped portion 2123 fixed to the other end of the shaft 2122. The shaft 2122 is fixed to the main body portion 111 of the base member 11 via a bearing 125. The first disc-shaped portion 2123 is fixed to the main body portion 121 in a position where its central axis coincides with the first oscillating axis Jx. Here, as shown in Figure 9A, the first disc-shaped portion 2123 is formed continuously and integrally with the shaft 2122 and is fixed to the main body portion 121 via the shaft 2122.

[0036] As shown in Figure 8, the second oscillating member 2013 is supported by the first oscillating member 2012 so as to be movable in a direction that allows it to oscillate around a second oscillating axis Jy extending in the Y-axis direction and in the direction of the second oscillating axis Jy. The second oscillating member 2013 has a main body portion 131, a long shaft 2132 with one end in the longitudinal direction fixed to the main body portion 131, and a disc-shaped second disc-shaped portion 2133 fixed to the other end of the shaft 2132. As shown in Figure 9B, the shaft 2132 is fixed to the main body portion 121 of the first oscillating member 2012 via a bearing 135, and the aforementioned one end in the longitudinal direction is fixed to a retaining piece 1312 of the main body portion 131. In this way, the main body 131 is supported by the first oscillating member 2012 so as to be movable in a direction that oscillates around a second oscillating axis Jy extending in the Y-axis direction via the shaft 2132, and in the direction of the second oscillating axis Jy. The second disc-shaped portion 2133 is fixed to the main body 131 in a position in which its central axis along its thickness direction coincides with the second oscillating axis Jy. Here, the second disc-shaped portion 2133 is formed in a continuous and integral manner with the shaft 2132 and is fixed to the main body 131 via the shaft 2132.

[0037] As shown in Figure 8, the two first retaining members 2015 are each bottomed cylindrical, having a cylindrical portion 2151, a bottom wall 152, and a connector 2153, and at least the cross-sectional shape perpendicular to the inner cylindrical axis is circular. The first retaining member 2015 holds the first elastic member 17 inside the cylindrical portion 2151, and is fixed to the base member 11 with its inner surface facing the outer circumferential surface of the first disc-shaped portion 2123 of the first oscillating member 2012 via the first elastic member 17. Furthermore, as shown in Figure 9A, the cylindrical portion 2151 has a first groove 2151a formed on its inner circumferential surface, into which the first elastic member 17 is fitted. Furthermore, a flow channel 2151b is provided at the top of the cylindrical portion 2151 on the +Z direction side, which penetrates the thickness direction of the cylindrical portion 2151 and communicates with a first region formed between the first elastic member 17 and the inside of the first groove 2151a when the first elastic member 17 is fitted into the first groove 2151a. The connector 2153 is disposed on the outside of the portion of the cylindrical portion 2151 in which the flow channel 2151b is formed.

[0038] Returning to Figure 8, the two second retaining members 2016 are each bottomed cylindrical, having a cylindrical portion 2161, a bottom wall 162, and a connector 2163, and their cross-sectional shape is circular, at least perpendicular to the inner cylindrical axis. The second retaining member 2016 holds the second elastic member 18 inside the cylindrical portion 2161, and is fixed to the first oscillating member 2012 with its inner surface facing the outer circumferential surface of the second disc-shaped portion 2133 of the second oscillating member 2013 via the second elastic member 18. Also, as shown in Figure 9B, the cylindrical portion 2161 has a second groove 2161a formed on its inner circumferential surface, into which the second elastic member 18 is fitted. Furthermore, a channel 2161b is provided at the top of the cylindrical portion 2161 on the +Z direction side, which penetrates the thickness direction of the cylindrical portion 2161 and communicates with a second region formed between the second elastic member 18 and the inside of the second groove 2161a when the second elastic member 18 is fitted into the second groove 2161a. The connector 2163 is disposed on the outside of the portion of the cylindrical portion 2161 in which the channel 2161b is formed.

[0039] As shown in Figure 10, the first oscillation restricting unit 2021 includes an air source 211, a tube 212 connected to the connector 2153 of the first holding member 2015, a connector 215, a pressure control valve 213, and a pressure control unit 214. In Figure 10, components similar to those in Embodiment 1 are denoted by the same reference numerals as in Figure 6. With the connector 215 connected to the connector 2153 of the first holding member 2015, the pressure control unit 214 controls the pressure control valve 213 to adjust the pressure of the air supplied from the air source 211 to the connector 2153, thereby restricting the movement of the first oscillation member 2012 relative to the base member 11. The second oscillation restricting unit 22 includes an air source 211, a tube 222 connected to the connector 2163 of the second holding member 2016, a connector 225, a pressure control valve 223, and a pressure control unit 214. Then, with the connector 225 connected to the connector 2163 of the second holding member 2016, the pressure control unit 214 controls the pressure control valve 223 to adjust the pressure of the air supplied from the air source 211 to the connector 2163, thereby restricting the movement of the second oscillating member 2013 relative to the first oscillating member 2012.

[0040] For example, as shown in Figure 11A, when the second elastic member 18 is not in contact with the outer peripheral surface 2133a of the second disc-shaped portion 2133 of the second oscillating member 2013, the second oscillating member 13 is able to swing freely relative to the first oscillating member 12 and move freely in the horizontal direction. When the second oscillation restricting unit 2022 restricts the oscillation and horizontal movement of the second oscillating member 2013 relative to the first oscillating member 2012, it supplies air from the connector 2163 through the flow path 2161b to the second region S2002 formed between the second elastic member 18 and the inside of the second groove 2161a. As a result, as shown by arrow AR2 in Figure 11B, the second elastic member 18 contracts, and the entire inner surface of the second elastic member 18 is pressed against the outer circumferential surface 2133a of the second disc-shaped portion 2133 of the second oscillating member 2013, thereby restricting the oscillation and horizontal movement of the second oscillating member 2013 relative to the first oscillating member 2012. Furthermore, when the first elastic member 17 is not in contact with the outer circumferential surface of the second disc-shaped portion 2133 of the second oscillating member 2013, the first oscillating member 2012 is able to swing freely relative to the base member 11 and move freely in the horizontal direction. When the first oscillation restricting unit 2021 restricts the oscillation and horizontal movement of the first oscillating member 12 relative to the base member 11, it supplies air from the connector 2153 shown in Figure 9A through the flow path 2151b to the first region formed between the first elastic member 17 and the inside of the first groove 2151a. As a result, the first elastic member 17 contracts, and the entire inner surface of the first elastic member 17 is pressed against the outer circumferential surface of the first disc-shaped portion 2123 of the first rocking member 2012, thereby restricting the rocking and horizontal movement of the first rocking member 2012 relative to the base member 11.

[0041] As described above, in the workpiece holding device 1 according to this embodiment, no flow channels are formed inside the shaft 2122 and the first disc-shaped portion 2123 of the first oscillating member 2012, and inside the shaft 2132 and the second disc-shaped portion 2133 of the second oscillating member 2013. As a result, processing to form flow channels is unnecessary when manufacturing the first oscillating member 2012 and the second oscillating member 2013, which has the advantage of making the manufacturing of the workpiece holding device 2 easier.

[0042] Although various embodiments of the present invention have been described above, the present invention is not limited to the configurations of the embodiments described above. For example, there may be multiple instances of at least one of the first elastic member 17 and the second elastic member 18. For example, in the workpiece holding device 1 according to Embodiment 1, a plurality of first grooves 123a extending along the circumferential direction are formed on the outer circumferential surface of the first holding portion 123 of the first oscillating member 12, and an annular first elastic member 17 may be fitted into each of the plurality of first grooves 123a. Alternatively, a plurality of second grooves 133a extending along the circumferential direction are formed on the outer circumferential surface of the second holding portion 133 of the second oscillating member 13, and an annular second elastic member 18 may be fitted into each of the plurality of second grooves 133a.

[0043] Furthermore, in the workpiece holding device 2 according to Embodiment 2, a plurality of first grooves 2151a extending along the circumferential direction are formed on the inner surface of the cylindrical portion 2151 of the first holding member 2015, and an annular first elastic member 17 may be fitted into each of the plurality of first grooves 2151a. Alternatively, a plurality of second grooves 2161a extending along the circumferential direction are formed on the inner surface of the cylindrical portion 2161 of the second holding member 2016, and an annular second elastic member 18 may be fitted into each of the plurality of second grooves 2161a.

[0044] With this configuration, when restricting the oscillation and horizontal movement of the first oscillating members 12, 2012 relative to the base member 11, a plurality of first elastic members 17 can be pressed against the inner surface of the first cylindrical member 15 or the outer circumferential surface of the first disc-shaped portion 2123 of the first oscillating member 2012. Also, when restricting the oscillation and horizontal movement of the second oscillating members 13, 2013 relative to the first oscillating members 12, 2012, a plurality of second elastic members 18 can be pressed against the inner surface of the second cylindrical member 16 or the outer circumferential surface of the second disc-shaped portion 2133 of the second oscillating member 2013. This makes it possible to improve the braking force that restricts the oscillation and horizontal movement of the first oscillating members 12, 2012 relative to the base member 11, or the control force that restricts the oscillation and horizontal movement of the second oscillating members 13, 2013 relative to the first oscillating members 12, 2012.

[0045] In each embodiment, an example was described in which the workpiece support portion 142 is cylindrical, and a tapered portion 142b is formed on its inner wall from approximately the center in the Z-axis direction to the end on the +Z-axis side, with the diameter increasing towards the +Z-axis side. However, the shape of the workpiece support portion is not limited to a cylindrical shape, and may be rectangular or elliptical depending on the shape of the workpiece W. In this case, the workpiece holder may have a tapered portion formed on the inside, where the area of ​​the cross-section perpendicular to the cylindrical axis increases towards one end in the cylindrical axis direction.

[0046] In each embodiment, an example was described in which the first oscillation restricting units 21, 2021 and the second oscillation restricting units 22, 2022 each comprise separate pressure control valves 213, 223, and connectors 124, 134 or connectors 2153, 2163 are connected to these separate pressure control valves 213, 223. However, the invention is not limited to this, and for example, as shown in Figure 12, the oscillation restricting unit 3021 may comprise one pressure control valve 213, and connectors 124, 134 or connectors 2153, 2163 are connected to a common pressure control valve 213. In Figure 12, components similar to those in each embodiment are denoted by the same reference numerals as in Figures 6 and 10.

[0047] In each embodiment, an example was described in which the movement of the first oscillating members 12 and 2012 relative to the base member 11 is restricted by adjusting the pressure of the air supplied from the air source 211 to the connector 124 of the first oscillating member 12 and the connector 2153 of the first holding member 2015, and the movement of the second oscillating members 13 and 2013 relative to the first oscillating members 12 and 2012 is restricted by adjusting the pressure of the air supplied from the air source 211 to the connector 134 of the second oscillating member 13 and the connector 2163 of the second holding member 2016. However, the fluid supplied to the connectors 124, 134, 2153, and 2163 is not limited to air, but may be a liquid such as water or oil. Furthermore, a configuration in which a gas other than air, such as nitrogen or oxygen, is supplied to the connectors 124, 134, 2153, and 2163 is also possible.

[0048] Although embodiments and modifications of the present invention have been described above, the present invention can be implemented in various forms and modifications without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. In other words, the scope of the present invention is indicated not by the embodiments, but by the claims. Various modifications made within the scope of the claims and the equivalent scope of the meaning of the invention are considered to be within the scope of this invention. [Industrial applicability]

[0049] This invention is suitable for a honing apparatus used to process gears, injector parts, and the like used in transmissions. [Explanation of Symbols]

[0050] 1,2: Workpiece holding device, 11: Base member, 12,2012: First oscillating member, 13,2013: Second oscillating member, 14: Workpiece holder, 15: First cylindrical member, 16: Second cylindrical member, 17: First elastic member, 18: Second elastic member, 19: Spacer, 19a: Opening, 21,2021: First oscillating restricting part, 22,2022: Second oscillating restricting part, 90: Honing tool, 91: Tool body, 92: Grinding wheel, 111, 121,131: Main body, 112: Support column, 113: Base, 122,132,2122,2132: Shaft, 122a,123b,124a, 132a,133b,134a,2151b,2161b: Flow path, 123: First retaining part, 123a,2151a: First groove, 124,134,215,225,2153,2163: Connector, 125,135: Bearing, 131a: Through hole, 131b,141a,142 a: stepped section, 133: second holding section, 133a, 2161a: second groove, 141: holder body, 142: work support section, 142b, 144b: tapered section, 142c, 1412: outer flange section, 143: biasing member, 144: spacer lock plate, 144a: hook, 144c: projection, 144d: through hole, 151, 161, 2151, 2161: cylindrical section, 152, 162: bottom wall, 161a: inner surface, 211: air source, 212, 222: Tube, 213, 223: Pressure control valve, 214: Pressure control unit, 1311: Main piece, 1312: Retaining piece, 1411: Main part, 1413: Lock plate support part, 2015: First retaining member, 2016: Second retaining member, 2123: First disc-shaped part, 2133: Second disc-shaped part, 2133a: Outer surface, 3021: Swinging restricting part, J0, J1, J2: Central axis, Jx: First swing axis, Jy: Second swing axis, W: Workpiece, Wh: Machined hole

Claims

1. A base member; a first oscillating member including a first main body portion supported by the base member so as to be movable in at least one of a direction in which the first oscillating axis extends in a first direction and a direction of the first oscillating axis, and a first holding portion which is disk-shaped and fixed to the first main body portion with a central axis coinciding with the first oscillating axis, and which holds a first annular elastic member over the entire outer circumferential surface; a second swinging member having a second main body portion supported by the first swinging member so as to be movable in at least one of a direction in which the second swinging axis extends in a second direction perpendicular to the first direction and a direction of the second swinging axis, and a second holding portion which is disk-shaped and fixed to the second main body portion in an orientation in which its central axis coincides with the second swinging axis, and which holds a circular second elastic member over the entire outer circumferential surface; a work holder fixed to the second body portion and configured to hold a work; a first cylindrical member that is cylindrical and has at least an inner cross-sectional shape perpendicular to a cylindrical axis direction that is circular, and is fixed to the base member with an inner surface facing an outer circumferential surface of the first holding portion via the first elastic member; a first swing restriction portion that restricts the first swing member from moving relative to the base member by expanding the first elastic member and pressing the entire outer side of the first elastic member against the inner side surface of the first cylindrical member; a second cylindrical member that is cylindrical and has at least a circular cross-sectional shape perpendicular to the inner cylindrical axis direction, and is fixed to the first swing member with an inner surface facing an outer circumferential surface of the second holding portion via the second elastic member; a second swing restriction portion that restricts the second swing member from moving relative to the first swing member by expanding the second elastic member and pressing the entire outer side of the second elastic member against the inner side surface of the second cylindrical member, Work holding device.

2. the first holding portion has a first groove formed over the entire circumferential direction of the outer circumferential surface, into which the first elastic member is fitted, and a first flow passage is provided that communicates with a first region formed between the first elastic member and an inner side of the first groove in a state in which the first elastic member is fitted into the first groove, the first swing restriction portion introduces a fluid into the first region through the first flow path, and expands the first elastic member in a direction perpendicular to the first swing axis and away from the first swing axis by a pressure of the fluid, the second retaining portion has a second groove formed over the entire circumferential direction of the outer circumferential surface, into which the second elastic member is fitted, and a second flow passage is provided that communicates with a second region formed between the second elastic member and an inner side of the second groove in a state in which the second elastic member is fitted into the second groove, the second swing restriction portion introduces a fluid into the second region through the second flow path, and expands the second elastic member in a direction perpendicular to the second swing axis and away from the second swing axis with respect to the entire second elastic member due to a pressure of the fluid. The workpiece holding device according to claim 1 .

3. A base member; a first oscillating member having a first main body portion supported by the base member so as to be movable in at least one of a direction in which the first main body portion oscillates around a first oscillating axis extending in a first direction and a direction of the first oscillating axis; and a first disk-shaped portion that is disk-shaped and fixed to the first main body portion in a position in which the central axis of the first disk-shaped portion coincides with the first oscillating axis; a second oscillating member having a second main body portion supported by the first oscillating member so as to be movable in at least one of a direction in which the second oscillating axis extends in a second direction perpendicular to the first direction and a direction of the second oscillating axis, and a second disk-shaped portion that is disk-shaped and fixed to the second main body portion in a position in which a central axis of the second oscillating axis coincides with the second oscillating axis; a work holder fixed to the second swing member and configured to hold a work; a first holding member having a cylindrical shape and a cross-sectional shape perpendicular to at least the inner cylindrical axis direction being circular, holding an annular first elastic member on the inside, and being fixed to the base member with an inner surface facing an outer circumferential surface of the first disk-shaped portion via the first elastic member; a first swing restriction portion that restricts the first swing member from moving relative to the base member by contracting the first elastic member and pressing it against an outer circumferential surface of the first disk-shaped portion; a second holding member that is cylindrical and has at least a circular cross-sectional shape perpendicular to the inner cylindrical axis direction, holds an annular second elastic member on the inside, and is fixed to the first swinging member with an inner surface facing an outer circumferential surface of the second disk-shaped portion via the second elastic member; a second swing restriction portion that restricts the second swing member from moving relative to the first swing member by contracting the second elastic member and pressing it against the outer circumferential surface of the second disk-shaped portion, Work holding device.

4. the first retaining member has a first groove formed over the entire circumferential direction of the inner surface, into which the first elastic member is fitted, and a first flow passage is provided that communicates with a first region formed between the first elastic member and an inner side of the first groove in a state in which the first elastic member is fitted into the first groove, the first swing restriction portion introduces a fluid into the first region through the first flow path, and causes the first elastic member to contract in a direction perpendicular to the first swing axis and approaching the first swing axis with respect to the entire first elastic member due to a pressure of the fluid, the second retaining member has a second groove formed over the entire circumferential direction of the inner surface, into which the second elastic member is fitted, and a second flow passage is provided that communicates with a second region formed between the second elastic member and an inner side of the second groove in a state in which the second elastic member is fitted into the second groove, the second swing restriction portion introduces a fluid into the second region through the second flow path, and causes the second elastic member to contract in a direction perpendicular to the second swing axis and approaching the second swing axis with respect to the entire second elastic member due to a pressure of the fluid, The workpiece holding device according to claim 3.

5. At least one of the first elastic member and the second elastic member is present in plurality. The workpiece holding device according to any one of claims 1 to 4.

6. The work holder includes: a holder body in which the workpiece is placed; a work support portion having a cylindrical shape and a tapered portion formed on the inside thereof, the tapered portion having an area of ​​a cross section perpendicular to the cylindrical axis direction increasing toward one end side in the cylindrical axis direction, the work support portion supporting the work with the tapered portion abutting against the work from the insertion direction side of the work into the holder body; and a biasing member fixed to the holder body and biasing the work support portion in a direction opposite to the insertion direction. The workpiece holding device according to any one of claims 1 to 4.

7. The work holder, a holder body in which the workpiece is placed; a work support portion having a cylindrical shape and a tapered portion formed on the inside thereof, the tapered portion having an area of ​​a cross section perpendicular to the cylindrical axis direction increasing toward one end side in the cylindrical axis direction, the work support portion supporting the work with the tapered portion abutting against the work from the insertion direction side of the work into the holder body; and a biasing member fixed to the holder body and biasing the work support portion in a direction opposite to the insertion direction. The workpiece holding device according to claim 5.

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