zipper

Abstract

To provide a chuck capable of improving work efficiency when machining a workpiece of an irregular shape. [Solution] The chuck 1 includes a chuck body 131, three sliding bodies 132 disposed in the chuck body 131 so as to be slidable along three imaginary axes J21, J22, and J23, and three arms 134 disposed so as to surround a central axis J1 of the chuck body 131, each having a gripping portion 1341 and a pivoted portion 1342 pivotally supported on the sliding body 132 so as to be rotatable. The three arms 134 are arranged such that the tip end of the gripping portion 1341 faces the central axis J1 side of the gripping portion 1341 of the adjacent arm 134, and the central axis J1 side of the adjacent sliding body 132 can abut against the sliding body 132 pivotally supporting the respective arm 134 on the side opposite to the central axis J1 side of the gripping portion 1341.

Description

[Technical Field]

[0001] The present invention relates to a chuck. [Background technology]

[0002] An NC processing device for bone members has been proposed, which is equipped with a bone member support part that supports bone members (see, for example, Patent Document 1). In surgery using this NC processing device for bone members, for example, bone harvested from a patient during surgery is shaped using this NC processing device for bone processing, and then transplanted into a site requiring treatment. Here, because bone harvesting is performed manually, the shape of the harvested bone is not stable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-173032 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, scroll chucks are often used in NC machining devices for bone components such as those described in Patent Document 1. However, most scroll chucks are designed to handle cylindrical workpieces, and the cross-sectional shape of the harvested bone is irregular depending on the state of the bone harvest, the patient's skeletal shape, and other factors. For this reason, scroll chucks may not be able to firmly grip the harvested bone. In this case, medical staff must use a cutting tool such as a chisel to process the harvested bone into a shape that can be firmly gripped by the scroll chuck, which may reduce work efficiency in the medical field.

[0005] The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a chuck that can improve the work efficiency when machining a workpiece of an irregular shape. [Means for solving the problem]

[0006] In order to achieve the above object, the chuck according to the present invention comprises: A chuck body; a plurality of sliding bodies arranged in the chuck body so as to be slidable along a plurality of imaginary axes extending radially from a central axis of the chuck body in a direction perpendicular to the central axis, the imaginary axes passing through a workpiece holding position where a workpiece to be held in the chuck body is placed; a plurality of arms each having a gripping portion that is arranged to surround the central axis of the chuck body and curved so as to be recessed toward the central axis, and a pivotally supported portion that is continuous with a base end of the gripping portion and pivotally supported on each of the plurality of sliding bodies so as to be rotatable; The plurality of arms include: In a state where the workpiece is gripped, The tip end of each of the gripping portions is located on the central axis side of the gripping portion of another arm adjacent to the other arm in one circumferential direction around the central axis. Aspects of and the central axis side of the sliding body and another sliding body adjacent in the circumferential direction, which pivotally supports the sliding body, abuts on the side opposite to the central axis side of the gripping portion. In this state Placed can . [Effects of the Invention]

[0007] According to the present invention, each of the plurality of arms has a gripping portion disposed so as to surround the central axis of the chuck body and curved so as to be recessed toward the central axis, and a pivoted portion continuous with the base end of the gripping portion and pivotally supported on each of the plurality of sliding bodies so as to be rotatable. With the workpiece gripped, The tip of each gripping portion is located on the central axis side of the gripping portion of the other arm adjacent to it in the circumferential direction. Aspects of and the central axis side of another sliding body adjacent in the circumferential direction to the sliding body that pivotally supports each of them abuts on the side opposite to the central axis side of the gripping portion. In this state Placed canAs a result, as each of the multiple sliding bodies advances toward the central axis of the chuck body, the side of the gripping portion of the arm on which each of the multiple sliding bodies is pivoted, opposite the central axis, is pushed forward by the other sliding bodies adjacent in the circumferential direction, causing the multiple arms to rotate toward the central axis around the portion pivoted to the sliding body, similar to a so-called iris diaphragm mechanism. Therefore, the workpiece rotates and moves along the central axis side of the gripping portion of each of the multiple arms and is gripped in a state where it abuts at an optimal abutment position on the gripping portion of each of the multiple arms, allowing the workpiece to be firmly held regardless of the cross-sectional shape of the workpiece. Therefore, when machining an irregularly shaped workpiece, no workpiece machining operation is required to firmly hold each irregularly shaped workpiece in the chuck, thereby improving work efficiency when machining an irregularly shaped workpiece. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a chuck according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the chuck according to the first embodiment. [Figure 3] 3 is a cross-sectional view of the chuck according to the first embodiment taken along line AA in FIG. 2. [Figure 4] 1A and 1B show an arm according to a first embodiment, in which FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view. [Figure 5] 1A and 1B are a plan view of a part of the chuck showing the operation of the chuck according to the first embodiment, showing the state immediately before the chuck holds a workpiece, and FIG. 1B is a view showing an example of the workpiece. [Figure 6] 1A and 1B show the operation of the chuck according to the first embodiment, in which FIG. 1A is a plan view of a portion of the chuck showing a state in which a workpiece is held, and FIG. 1B is a plan view of a portion of the chuck showing a state in which another workpiece is held. [Figure 7] FIG. 10 is a perspective view of a chuck according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a cross-sectional view of a portion of a chuck according to a second embodiment. [Figure 9]FIG. 10 is a perspective view of a chuck and a chuck handle according to a third embodiment of the present invention. [Figure 10] 10A, 10B, and 10C show a chuck handle according to a third embodiment, in which (A) is a side view, (B) is a plan view, and (C) is a cross-sectional view. [Figure 11] FIG. 11 is a perspective view of a chuck and a positioning jig according to a third embodiment. [Figure 12] FIG. 11 is a side view of a chuck and a positioning jig according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment 1) A chuck according to an embodiment of the present invention will be described below with reference to the drawings. The chuck according to this embodiment includes a chuck body, a plurality of slides disposed on the chuck body so as to be slidable along a plurality of imaginary axes extending radially from a central axis of the chuck body, which passes through a workpiece holding position where a workpiece to be held is placed in the chuck body, in a direction perpendicular to the central axis, and a plurality of arms, each having a gripping portion disposed to surround the central axis of the chuck body and curved so as to be recessed toward the central axis, and a pivoted portion continuous with a base end of the gripping portion and pivotally supported on each of the slides so as to be rotatable. The plurality of arms are arranged so that a tip end of the gripping portion faces the central axis side of the gripping portion of an adjacent arm in the circumferential direction around the central axis, and the central axis side of the adjacent slide in the circumferential direction can abut on the side opposite the central axis side of the gripping portion.

[0010] 1 and 2, the chuck 1 according to this embodiment includes a chuck body 131, three sliding bodies 132, and three arms 134. The chuck body 131 is cylindrical with a bottom and includes a shell body 1311 having an opening 1311a in the bottom wall as shown in Fig. 3, and a disk-shaped rotating disk 1312 that is disposed inside the shell body 1311 and is rotatable relative to the shell body 1311. A spiral scroll groove 1312a centered on the central axis J1 of the chuck body 131 is formed on the +Z direction side of the rotating disk 1312.

[0011] The chuck body 131 also includes a support block 1314 that is inserted into an opening 1311a of the outer shell body 1311 and supports the turntable 1312 rotatably around the central axis J1 of the chuck body 131, a cover plate 1315 that is disposed so as to cover the +Z direction side of the turntable 1312 and is fixed to an end of the support block 1314 on the +Z direction side, and a rotating member 1313 that rotates in conjunction with the turntable 1312. The support block 1314 includes a base portion 13141 whose tip portion is inserted into the opening 1311a of the outer shell body 1311, and a support portion 13142 that has an outer flange portion 13142a that protrudes outward from the side wall perpendicular to the Z-axis direction and rotatably supports the turntable 1312 with the turntable 1312 placed on the +Z direction side of the outer flange portion 1314a. The base portion 13141 is provided with a screw hole 13141b into which a screw 1317 is threaded to fasten the support portion 13142 and the cover plate 1315 together to the base portion 13141. The support portion 13142 is also provided with a through hole 13142b that penetrates the support portion 13142 in the Z-axis direction and into which the screw 1317 is inserted. Here, with the base end of the support portion 13142 fixed to the tip portion of the base portion 13141, the outer periphery of the opening 1311a of the outer shell body 1311 is positioned opposite the -Z direction side of the outer flange portion 13142a. In addition, an outer flange portion 13141a is provided on the base end side of the base portion 13141, extending outward from the side wall perpendicular to the Z-axis direction, and a wave spring 1316 that supports the outer shell body 1311 is interposed between the outer periphery of the opening 1311a of the outer shell body 1311 and the outer flange portion 13141a.

[0012] 1 and 2, three slits 1315a are formed in the cover plate 1315. The three slits 1315a extend along three imaginary axes J21, J22, and J23 that extend radially from the central axis J1 of the chuck body 131. As shown in Fig. 3, a slider 132 is inserted into each of the slits 1315a. The cover plate 1315 is also formed with a pin mounting hole 1315b into which a pin 137 is fitted. The pin 137 is fixed so that its end on the -Z direction side is fitted into the pin mounting hole 1315b and its end on the +Z direction side protrudes toward the +Z direction side of the cover plate 1315.

[0013] The rotating member 1313 has a cylindrical rotating member main body 13131 whose end on the -Z direction side is fixed to the periphery of the rotating plate 1312, and an inner flange portion 13132 that protrudes inward from the end on the +Z direction side of the rotating member main body 13131. The rotating member 1313 rises in the +Z direction from the entire outer periphery of the rotating plate 1312, and is arranged so that the end on the +Z direction side is exposed on the +Z direction side of the cover plate 1315.

[0014] 1 and 2, the three sliding bodies 132 are disposed in the chuck body 131 so as to be slidable along three imaginary axes J21, J22, and J23 extending radially in a direction perpendicular to the central axis J1 from a central axis J1 passing through a workpiece holding position Pos1 where a workpiece to be held is placed in the chuck body 131. Each of the three sliding bodies 132 has an arm support portion 1321 and a hinge pin 1323. The arm support portion 1321 pivotally supports the arm 134 via the hinge pin 1323 so as to be rotatable. Here, a hinge groove 1321a is formed in the arm support portion 1321 from a surface facing the central axis J1 to a surface on the circumferential direction AR1 side around the central axis J1, as indicated by the arrow AR1 in FIG. 2. The arm 134 is pivotally supported by the hinge pin 1323 with a portion of the arm 134 fitted in the hinge groove 1321a. The arm support portion 1321 is provided with a through-hole 1321b through which a screw 1324 is inserted, the screw 1324 passing through the arm support portion 1321 in the Z-axis direction and for fixing the arm support portion 1321 to a sliding body main body 1322 (described later). The hinge pin 1323 may be fixed to the arm support portion 1321 or may be detachable. When the hinge pin 1323 is detachable from the arm support portion 1321, the arm 134 can be detached from the arm support portion 1321 by detaching the hinge pin 1323 from the arm support portion 1321. The arm 134, the arm support portion 1321, and the hinge pin 1323 can be cleaned separately, which improves the workability of maintenance of these components.

[0015] 3, each of the three sliding bodies 132 has a sliding body main body 1322 on which teeth 1322a that screw into the scroll groove 1312a of the rotary disk 1312 are protruded in the −Z direction. A screw hole 1322b is formed in the sliding body main body 1322 to fix the arm support part 1321 to the sliding body main body 1322 with a screw 1324. The arm support part 1321 is fixed to the sliding body main body 1322 by threading the tip end of the screw 1324 inserted into the through hole 1321b of the arm support part 1321 into the screw hole 1322b of the sliding body main body 1322.

[0016] 1 and 2, each of the three arms 134 has a gripping portion 1341 that is disposed so as to surround the central axis J1 of the chuck body 131 and curved so as to be recessed toward the central axis J1, and a pivoted portion 1342 that is continuous with a base end of the gripping portion 1341 and is rotatably supported on each of the plurality of sliding bodies 132. Here, each of the three arms 134 is disposed so that a tip end of the gripping portion 1341 faces the central axis J1 side of the gripping portion 1341 of the adjacent arm 134 in a circumferential direction AR1 around the central axis J1. When viewed from the Z-axis direction, each of the three arms 134 is pivotally supported by a hinge pin 1323 at a portion of the sliding body 132 that is located on the circumferential direction AR1 side of the imaginary axes J21, J22, and J23. As a result, the three arms 134 can abut on the side of the central axis J1 of the sliding body 132 that pivotally supports each of them and the other sliding body 132 adjacent to it in the circumferential direction AR1 on the side opposite to the central axis J1 side of the gripping portion 1341.

[0017] As shown in Fig. 4(A), the gripping portion 1341 is in the shape of a curved plate, and has a shape in which the thickness decreases from the base end to the tip end. The tip end of the gripping portion 1341 has a rounded shape when viewed from the Z-axis direction. As shown in Fig. 4(B), the pivotally supported portion 1342 is provided with a through-hole 1342a that is circular in plan view, and a hinge pin 1323 is inserted into the through-hole 1342a. Here, the sliding body 132 is provided with a biasing member 136 formed from an elastic wire. The biasing member 136 has a winding portion 1361 wound spirally around the hinge pin 1323, an arm fixing portion 1362 that is continuous with one end of the winding portion 1361 and has an L-shaped bent tip portion fixed to the arm 134, and an extending portion 1363 that extends from the other end of the winding portion 1361 and is arranged to abut against a bottom surface 1321c of the hinge groove 1321a of the arm support portion 1321. When the arm 134 rotates so that the opening angle formed between the central axis J3 of the hinge pin 1323 and the tip end Po2 of the arm 134 becomes an angle different from a preset reference angle θ1, the biasing member 136 applies a biasing force to the arm 134 by its restoring force in a direction that rotates the arm 134 so that the opening angle returns to the reference angle θ1.

[0018] Next, the operation of the chuck according to this embodiment will be described. First, as shown in FIG. 5(A), it is assumed that the workpiece W1 is placed in an area surrounded by three arms 134A, 134B, and 134C with a corner Pw11 of the workpiece W1 abutting against the arc portion of the gripping portion 1341 of one arm 134 on the central axis J1 side. Note that the workpiece W1 may also be placed in an abutting state with the arc portion of the gripping portion 1341 of either of the other two arms 134 on the central axis J1 side. Here, the workpiece W1 has a long rectangular column shape and has a first surface W1a and a second surface W1b along the longitudinal direction as shown in FIG. 5(B). At this time, the workpiece W1 is slidable relative to the chuck body 131 within the area surrounded by the three arms 134, as indicated by the rectangular dashed line in FIG. 5(A). Next, when the three sliding bodies 132 slide in a direction approaching the central axis J1 of the chuck body 131, the area surrounded by the three arms 134A, 134B, and 134C gradually shrinks. Then, as shown in Fig. 6(A), a tip end portion Po134a of the arm 134B that is adjacent in the circumferential direction to the arm 134A that is in contact with the corner portion Pw11 of the workpiece W1 comes into contact with the first surface W1a of the workpiece W1, and a tip end portion Po134b of the arm 134C that is adjacent in the circumferential direction to the arm 134B comes into contact with the second surface W1b of the workpiece W1. At this time, a resultant force F23 of a force F21 pressing the workpiece W1 by the arm 134A and a force F22 pressing the workpiece W1 by the arm 134C is engaged with a force pressing the workpiece W1 by the arm 134B, and the workpiece W1 is gripped by the three arms 134A, 134B, and 134C with its corner Pw11 fixed at one point on the arc portion on the central axis J1 side of the gripping portion 1341 of the arm 134A. Here, the gripping state of the workpiece W1 by the three arms 134A, 134B, and 134C is maintained as long as the aforementioned turntable 1312 of the chuck body 131 is not rotated in the direction opposite to the rotation direction when the three sliding bodies 132 slide in the direction approaching the central axis J1.

[0019] The chuck 1 according to this embodiment can also firmly grip a workpiece W2 having a cross-sectional shape as shown in Fig. 6(B) . Here, the workpiece W2 has two corners Pw21 and PW22, of which the corner Pw21 abuts against the arm 134A, the other corner Pw22 abuts against the tip end Po134a of the arm 134B that is adjacent to the arm 134A in the circumferential direction, and the tip end Po134b of the arm 134C that is adjacent to the arm 134B in the circumferential direction abuts against the curved surface W2a of the workpiece W2. At this time, the resultant force F33 of the force F31 pressing the workpiece W1 by arm 134A and the force F32 pressing the workpiece W2 by arm 134C is balanced with the force pressing the workpiece W2 by arm 134B, and the workpiece W2 is gripped by the three arms 134A, 134B, and 134C with its corner Pw11 fixed at one point in the arc portion on the central axis J1 side of the gripping portion 1341 of arm 134A.

[0020] As described above, according to the chuck 1 of this embodiment, the three arms 134 each have a gripping portion 1341 that is arranged to surround the central axis J1 of the chuck body 131 and curved so as to be recessed toward the central axis J1, and a pivoted portion 1342 that is continuous with the base end of the gripping portion 1341 and is rotatably supported on each of the three sliding bodies 132. The three arms 134 are arranged such that the tip end of the gripping portion 1341 faces the central axis J1 side of the gripping portion 1341 of the other arm 134 adjacent to it in the circumferential direction. The three arms 134 are also arranged so that the central axis J1 side of the other sliding body 132 adjacent to the sliding body 132 that pivotally supports each arm 134 can abut on the side opposite to the central axis J1 side of the gripping portion 1341. As a result, as each of the three sliding bodies 132 advances toward the central axis J1 of the chuck body 131, the opposite side of the central axis J1 of the gripping portions 1341 of the arms 134 on which each of the three sliding bodies 132 is pivoted is pushed forward by the other sliding bodies 132 adjacent in the circumferential direction, causing each of the three arms 134 to move toward the central axis J1 around the portion pivoted to the sliding body 132, similar to a so-called iris diaphragm mechanism. Therefore, the workpiece W1 rotates or moves along the central axis J1 side of the gripping portions 1341 of each of the three arms 134 and is gripped in a state in which it abuts on the optimal abutting positions of the gripping portions 1341 of each of the three arms 134, so that the workpiece W1 can be firmly held regardless of the cross-sectional shape of the workpiece W1. Therefore, when machining an irregularly shaped workpiece W1, there is no need to perform a machining operation to shape the workpiece W1 in advance in order to firmly hold each irregularly shaped workpiece W1 in the chuck 1, which increases the work efficiency when machining the irregularly shaped workpiece W1.

[0021] Conventionally, so-called scroll chucks with self-aligning functions have been used as chucks for gripping workpieces. These scroll chucks are classified as three-jaw chucks, four-jaw chucks, or six-jaw chucks depending on the number of jaws that grip the workpiece. While these chucks are used for various purposes, they are all designed to grip workpieces that are cylindrical. Therefore, these chucks may not be able to grip non-cylindrical workpieces, such as workpieces with square, rectangular, trapezoidal, semicircular, or fan-shaped cross sections, firmly enough. Therefore, when gripping such workpieces, it has been common to use a dedicated fixture for the workpiece to match its cross-sectional shape or a special chuck with multiple jaws that slide independently. However, this requires the use of multiple types of fixtures or special chucks for each type of workpiece, which can reduce work efficiency and increase the preparation burden. Furthermore, in the medical field, for example, when treating avulsion fractures, bone set surgery may be performed using screws made of metals such as titanium or materials with high affinity for biological tissue. In bone-synthesis surgery, bone from the patient with good bone fusion is harvested during surgery, and screws of an optimal size for bone fusion are machined and used. This eliminates the need for a second surgery to remove the screws after bone fusion, thereby reducing the burden on the patient. In this case, the shape of the bone material harvested from the patient is not limited to cylindrical, depending on the patient's bone condition and skeletal shape. For this reason, it may be difficult to firmly grip the bone material using the conventional chuck described above. In contrast, the chuck 1 according to the present embodiment can firmly grip workpieces of various cross-sectional shapes using the same operation as a conventional scroll chuck, without using a dedicated workpiece fixing jig or separately preparing the jaws. Therefore, for example, the time required to process the bone material harvested from the patient during bone-synthesis surgery can be shortened, thereby reducing the burden on the surgeon and ultimately reducing the overall time required for the bone-synthesis surgery, thereby reducing the burden on the patient.

[0022] (Embodiment 2) The chuck according to this embodiment differs from the chuck according to the first embodiment in that a plurality of arms are pivotally supported on one sliding body so as to be freely rotatable.

[0023] As shown in FIG. 7, a chuck 2001 according to this embodiment includes a chuck main body 131, three sliding bodies 2132, three arms 134, and three sub-arms 2134. In FIG. 7, the same components as those in FIG. 1 are denoted by the same reference numerals. Each of the three sliding bodies 2132 includes an arm support portion 21321 and a hinge pin 1323. The arm support portion 21321 pivotally supports the arm 134 and the sub-arm 2134 via the hinge pin 1323. The arm support portion 21321 is provided with two hinge grooves 21321a that are parallel to each other in the Z-axis direction and extend from a surface facing the central axis J1 to a surface facing the circumferential direction AR1 around the central axis J1, as indicated by the arrow AR1. The arm 134 is pivotally supported by the hinge pin 1323 with a portion thereof fitted into one of the two hinge grooves 21321a located on the -Z direction side. The sub-arm 2134 is pivotally supported by the hinge pin 1323 with a portion thereof fitted into the other of the two hinge grooves 21321a located on the +Z direction side.

[0024] Each of the three sub arms 2134 has a gripping portion 1341 that is disposed so as to surround the central axis J1 of the chuck body 131 and curved so as to be recessed toward the central axis J1, and a pivoted portion 21342 that is continuous with a base end of the gripping portion 1341 and is rotatably supported on each of the plurality of sliding bodies 2132. Here, each of the three sub arms 2134 is disposed so that a tip end of the gripping portion 1341 faces the central axis J1 side of the gripping portion 1341 of the adjacent other sub arm 2134 in the circumferential direction AR1 around the central axis J1. Furthermore, when viewed from the Z-axis direction, each of the three sub arms 2134 is pivoted by a hinge pin 1323 at a portion that is located one circumferential direction AR1 side of the imaginary axes J21, J22, and J23 described in the embodiment of the sliding body 2132, similar to the arm 134. As a result, the three sub-arms 2134 can abut on the side of the central axis J1 of the sliding body 2132 that pivots around each of them and another sliding body 2132 adjacent to them in one circumferential direction AR1 on the side opposite to the central axis J1 side of the gripping portion 1341.

[0025] 8, an elongated hole 21342a is formed through the pivotally supported portion 1342 of the sub arm 2134, and a hinge pin 1323 is inserted into the elongated hole 21342a so as to be movable along the longitudinal direction of the elongated hole. As a result, when the three sliding bodies 2132 are slid in a direction approaching the central axis J1 of the chuck body 131 and the three arms 134 are brought into contact with the workpiece W3, the sub arm 2134 is allowed to move differently from the arm 134. Therefore, even if the cross-sectional shape of the portion of the workpiece W3 facing the three sub arms 2134 is different from the cross-sectional shape of the portion gripped by the three arms 134, all three sub arms 2134 can be brought into contact with the workpiece W3.

[0026] As described above, the chuck 2001 according to this embodiment can grip the workpiece W3 at multiple locations in the Z-axis direction, and therefore can grip the workpiece W3 more firmly.

[0027] (Embodiment 3) The chuck of this embodiment differs from embodiment 1 in that the chuck body has a rotating member having a cylindrical rotating member body with one end in the axial direction of the cylinder fixed to the periphery of a rotating disk, and an inner flange portion that extends inward from the entire other end in the axial direction of the cylinder of the rotating member body and has multiple teeth formed over the entire tip portion.

[0028] As shown in FIG. 9, the chuck 3001 according to this embodiment includes a chuck body 3131 having a rotating member 31313. Note that in FIG. 9, components similar to those in the first embodiment are denoted by the same reference numerals as in FIG. 1. The rotating member 31313 includes a cylindrical rotating member body 313131 having a -Z direction end fixed to the periphery of a rotating disk (not shown), and an inner flange 313132 extending inward from the +Z direction end of the rotating member body 313131. As described in the first embodiment, the rotating disk is disk-shaped and disposed inside the outer shell body 1311, allowing it to rotate relative to the outer shell body 1311. Furthermore, a plurality of teeth 313132a are formed over the entire tip of the inner flange 313132. Similarly to the first embodiment, the rotating member 31313 is disposed so that it extends upward in the +Z direction from the entire outer periphery of the rotating disk, with its +Z direction end exposed on the +Z direction side of the cover plate 1315.

[0029] The rotating member 31313 of the chuck 3001 according to this embodiment can be rotated using a chuck handle 3005 and a rotation transmitting member 3006. The rotation transmitting member 3006 has a long shaft 3061, a gear 3062 provided at one end in the longitudinal direction of the shaft 3061, and a protrusion 3063 having a hexagonal cross section provided at the other end of the shaft 3061. When the gear 3062 is rotatably fitted to the tip of the pin 137 disposed in the chuck body 3131, the gear 3062 meshes with the teeth 313132a of the rotating member 31313 of the chuck body 3131.

[0030] 10(A) to 10(C), the chuck handle 3005 includes a long handle body 3052, a long grip portion 3051 to be gripped by a user, a hinge pin 3054 connecting the handle body 3052 and the grip portion 3051, and a long elastic member 3053. A through-hole 3052a having a hexagonal shape in a plan view is provided at the tip of the handle body 3052 and penetrating the handle body 3052. This through-hole 3052a can be fitted onto a protrusion 3063 of the rotation transmission member 3006. The elastic member 3053 is formed from an elastic metal such as β-titanium, and as shown in FIG. 10(C), one end in the longitudinal direction is fixed to the hinge pin 3054 and the other end is engaged by a stopper 3055 embedded in the handle body 3052.

[0031] Here, a method of using the chuck handle 3005 and the rotation transmission member 3006 will be described. First, the gear 3062 of the rotation transmission member 3006 is meshed with the teeth 313132a of the rotation member 31313 of the chuck body 3131. Next, the protrusion 3063 of the rotation transmission member 3006 is fitted into the through-hole 3052a of the chuck handle 3005. In this state, the gripping portion 3051 of the chuck handle 3005 is gripped and turned. At this time, the elastic member 3053 gradually deforms so as to be curved, and depending on the degree of deformation, the angle formed between the longitudinal direction of the handle body 3052 and the longitudinal direction of the gripping portion 3051 at the hinge pin 3054 deviates from 180 degrees. The handle body 3052 is provided with 19 graduations that reflect the difference angle between 180 degrees and the angle formed between the longitudinal direction of the handle body 3052 and the longitudinal direction of the gripping portion 3051. This allows the torque applied to the rotation transmission member 3006 by the chuck handle 3005 to be visually confirmed, making it easier to adjust the torque applied to the rotation transmission member 3006 to an appropriate torque.

[0032] The rotating member 31313 of the chuck 3001 according to this embodiment can also be rotated using the chuck handle 3005 while the position of the workpiece W3 is fixed using a positioning jig 4007, as shown in FIGS. 11 and 12 . The positioning jig 4007 includes two long support columns 4074, a long shaft 4071, a gear 4072 provided at one end of the shaft 4071 in the longitudinal direction, and a protrusion 4073 with a hexagonal cross section provided at the other end of the shaft 4071. The +Z direction ends of the two support columns 4074 are fitted to the tip portions of the pins 137 provided in the chuck body 3131. When the gear 4072 is rotatably fitted to the tip portion of the pin 137 provided in the chuck body 3131, it meshes with the teeth 313132a of the rotating member 31313 of the chuck body 3131. The positioning jig 4007 also has a plate 4075 that is supported by the ends of the two support columns 4074 on the +Z direction side and rotatably holds the shaft 4071. As shown in FIG. 12, a cone-shaped rivet 4075a that protrudes in the -Z direction is provided at the center of the plate 4075.

[0033] When the workpiece W3 is gripped by the chuck 3001, the tip of the rivet 4075a of the positioning jig 4007 is inserted into the end of the workpiece W3 on the +Z direction side, thereby holding the workpiece W3 without tilting.

[0034] Incidentally, particularly in the medical field, when cutting and processing bone material collected from a patient, the bone material may be gripped by a chuck. In this case, if the force gripping the bone material by the chuck is excessive, the bone material may be damaged. On the other hand, if the force gripping the bone material is too weak, the bone material may fall off the chuck during cutting and processing. In contrast, the chuck 3001 according to this embodiment allows the bone material to be gripped by the chuck 3001 using the chuck handle 3005 and the rotation transmission member 3006 described above. As described above, the chuck handle 3005 allows the torque applied to the rotation transmission member 3006 to be visually confirmed. Therefore, the bone material can be gripped by the chuck 3001 with a necessary and sufficient gripping force regardless of the user's sense, experience, etc., so that even an inexperienced user can properly grip the bone material in the chuck 3001.

[0035] Furthermore, by using the positioning jig 4007 according to this embodiment, it is possible to prevent the workpiece W3 from being gripped by the chuck 3001 in an unintentionally tilted state.

[0036] Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the above-described embodiments. For example, each embodiment may include four or more sliding bodies 132, 2132, arms 134, and sub-arms 2134.

[0037] In each embodiment, an example has been described in which the chuck body 131, 3131 is a so-called scroll chuck in which the sliders 132, 2132 are slid by the turntable 1312. However, the means for sliding the sliders 132, 2132 is not limited to having the turntable 1312. For example, the chuck body may have a linear actuator, an air cylinder, or the like that slides the sliders 132, 2132 along the imaginary axes J21, J22, and J23, respectively.

[0038] Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these. The present invention includes any combination of the embodiments and modifications, and any combination to which appropriate modifications have been made. [Industrial Applicability]

[0039] The present invention is suitable as a chuck used when cutting a workpiece of an irregular shape. [Explanation of symbols]

[0040] 1, 2001, 3001: chuck, 131, 3131: chuck body, 132, 2132: sliding body, 134, 134A, 134B, 134C: arm, 136: biasing member, 137: pin, 1311: outer shell body, 1311a: opening, 1312: rotating disk, 1312a: scroll groove, 1313: rotating member, 1314: support block, 1315: cover plate 1315a: slit, 1315b: pin mounting hole, 1316: wave spring, 1317, 1324: screw, 1321b, 1342a, 3052a, 13142b: through hole, 1321: arm support part, 1321c: bottom surface, 1322: sliding body main body, 1322a: tooth part, 1322b, 13141b: screw hole, 1323, 3054: hinge pin, 132 1a, 21321a: hinge groove, 1341, 3051: gripping portion, 1342, 21342: pivoted portion, 1361: winding portion, 1362: arm fixing portion, 1363: extension portion, 2134: sub-arm, 3005: chuck handle, 3006: rotation transmission member, 3052: handle body, 3053: elastic member, 3061, 4071: shaft, 3062, 4072: teeth Wheel, 3063, 4073: protrusion, 4007: positioning jig, 4074: support, 4075: plate, 4075a: rivet, 13131: rotating member body, 13132: inner flange, 13141: base, 13141a, 13142a: outer flange, 13142: support, 21342a: elongated hole, J1: central axis, J21, J22, J23: virtual axis, Pos1: workpiece holding position

Claims

1. A chuck body; a plurality of sliding bodies arranged in the chuck body so as to be slidable along a plurality of imaginary axes extending radially from a central axis of the chuck body in a direction perpendicular to the central axis, the imaginary axes passing through a workpiece holding position where a workpiece to be held in the chuck body is placed; a plurality of arms each having a gripping portion that is arranged to surround the central axis of the chuck body and curved so as to be recessed toward the central axis, and a pivotally supported portion that is continuous with a base end of the gripping portion and pivotally supported on each of the plurality of sliding bodies so as to be rotatable; The plurality of arms are arranged such that, in a state where the workpiece is gripped, a tip end of the gripping portion faces a side surface of the gripping portion of another arm adjacent to the arm in one circumferential direction around the central axis, and the central axis side of the sliding body pivotally supporting each arm and the other sliding body adjacent to the arm in the circumferential direction abuts on a side opposite to the central axis side of the gripping portion. Zipper.

2. The chuck body has a rotating disk having a spiral scroll groove disposed therein, The sliding bodies each have a tooth portion that is threadedly engaged with the scroll groove, and are capable of threadably advancing along the virtual axis as the rotary disk rotates.

2. The chuck of claim 1.

3. the sliding body pivotally supports the arm via a hinge pin so as to be freely rotatable; The arm and the hinge pin are detachable from the sliding body.

3. The chuck according to claim 1 or 2.

4. When viewed from the direction of the central axis, the arm is pivotally supported at a portion of the sliding body that is located on the circumferential side of the virtual axis.

3. The chuck according to claim 1 or 2.

5. The gripping portion is a curved plate-like member having a shape that becomes thinner from the base end to the tip end.

5. The chuck of claim 4.

6. The tip of the gripping portion has a rounded shape when viewed from a direction along the central axis.

3. The chuck according to claim 1 or 2.

7. The sliding body is detachable from the chuck body.

3. The chuck according to claim 1 or 2.

8. a plurality of sub arms each having a gripping portion disposed so as to surround the central axis of the chuck body and curved so as to be recessed toward the central axis, and a pivotally supported portion continuous with a base end of the gripping portion and pivotally supported on each of the plurality of sliding bodies so as to be rotatable, the sliding body pivotally supports the arm and at least one of the sub-arms via a hinge pin, a long hole through which the hinge pin is inserted is formed in the pivotally supported portion of the sub-arm; 3. The chuck according to claim 1 or 2.

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