Stopper assembly and stopper

Abstract

To provide a stopper assembly and a stopper contributing to improvement of workability about adjustment of projection length of an object to be gripped.SOLUTION: A stopper 200 is inserted into a sleeve 300 coupled to a collet chuck 20. The stopper 200 includes a shaft part 210, a large diameter part 220 and a support part 230 integrally configured. The shaft part 210 includes a guide part 211 which guides a pressing part 400 that moves the sleeve 300 to the stopper 200 with respect to an axial direction of the stopper 200. The large diameter part 220 is configured to enlarge the sleeve 300. The support part 230 is provided opposite the shaft part 210 relative to the large diameter part 220 with respect to the axial direction of the stopper 200 and includes a supporting surface 231 supporting the object to be gripped.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a stopper assembly and a stopper. [Background technology]

[0002] In one example, the processing device includes a collet chuck that grips an object to be gripped, such as a workpiece or a tool. Patent Document 1 describes an example of a collet chuck. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 61-20206 Summary of the Invention [Problem to be solved by the invention]

[0004] The object to be grasped by the collet chuck includes a grasp target portion disposed inside the collet chuck and a protruding portion disposed outside the collet chuck. The length of the protruding portion of the object to be grasped in the axial direction is referred to as the "protruding length of the object to be grasped." It is preferable that the protruding length of the object to be grasped can be easily adjusted. [Means for solving the problem]

[0005] The stopper of the present invention is a stopper that is inserted into a sleeve that is connected to a collet chuck, and includes a shaft portion, a large diameter portion, and a support portion that are integrally formed, the shaft portion includes a guide portion that guides a pressing portion that moves the sleeve relative to the stopper in the axial direction of the stopper, the large diameter portion is configured to expand and deform the sleeve, and the support portion is provided on the opposite side of the shaft portion with respect to the large diameter portion in the axial direction of the stopper, and includes a support surface that supports the object to be grasped.

[0006] The stopper, the sleeve and the pressing portion constitute a stopper assembly. The collet chuck and the stopper assembly constitute a chuck assembly. The stopper assembly is inserted into the collet chuck.

[0007] The collet chuck includes a gripping portion in which an object to be gripped is placed. The object to be gripped is inserted into the gripping portion of the collet chuck. The object to be gripped is supported by a support surface of the stopper.

[0008] The pressing portion is operated so as to move relative to the stopper in the axial direction of the stopper. The movement of the pressing portion moves the sleeve relative to the stopper in the axial direction of the stopper. The movement of the sleeve brings the sleeve into contact with the large diameter portion of the stopper.

[0009] The sleeve is expanded and deformed by contact between the sleeve and the large diameter portion. The sleeve is pressed against the collet chuck by the expansion and deformation of the sleeve. The position of the stopper relative to the collet chuck in the axial direction of the stopper is determined by the sleeve being pressed against the collet chuck.

[0010] By determining the position of the stopper, the position of the support surface relative to the collet chuck is determined, and by determining the position of the support surface, the protruding length of the object to be grasped is determined.

[0011] The above-mentioned configuration provides the following advantages, for example: Since the shaft portion, the large diameter portion, and the support portion are integrally configured, the position of the support surface relative to the collet chuck in the axial direction of the stopper can be changed by operating the pressing portion. It is expected that the workability in adjusting the protruding length of the object to be grasped will be improved.

[0012] In one example, the support portion includes a support shaft extending in the axial direction of the stopper, and the support shaft includes the support surface.

[0013] According to the above-mentioned configuration, for example, the following effects can be obtained: By disposing the support shaft in the gripping portion of the collet chuck, a small object to be gripped can be supported by the support surface.

[0014] In one example, the outer diameter of the support shaft is smaller than the outer diameter of the large diameter portion.

[0015] According to the above-mentioned configuration, for example, the following effects can be obtained: The support shaft can be more easily disposed in the gripping portion of the collet chuck, compared to a case in which the outer diameter of the support shaft is equal to or larger than the outer diameter of the large diameter portion.

[0016] In one example, the length of the support shaft in the axial direction of the stopper is equal to or greater than the length of the large diameter portion in the axial direction of the stopper.

[0017] According to the above-mentioned configuration, for example, the following effects can be obtained: The support surface is farther away from the large diameter portion than when the length of the support shaft in the axial direction of the stopper is shorter than the length of the large diameter portion in the axial direction of the stopper. The support surface can be brought closer to the opening of the gripping portion of the collet chuck.

[0018] In one example, the guide portion is configured to include a portion that is located outside the collet chuck when the stopper is inserted into the collet chuck.

[0019] According to the above-described configuration, for example, the following effects can be obtained: The operability of the pressing portion coupled to the guide portion is improved.

[0020] The stopper assembly according to the present invention includes the stopper, the sleeve, and the pressing portion.

[0021] According to the above-mentioned configuration, for example, the following effects can be obtained: It is expected that the workability in adjusting the protruding length of the object to be grasped will be improved. Effect of the Invention

[0022] According to the stopper assembly and the stopper of the present invention, it is expected that the workability in adjusting the protruding length of the object to be grasped will be improved. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a perspective view of a chuck assembly according to the first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the chuck assembly of the embodiment. [Diagram 3] FIG. 4 is an exploded perspective view of the stopper assembly of the embodiment. [Figure 4] FIG. 2 is a cross-sectional view (1) of the chuck assembly of the embodiment. [Diagram 5] FIG. 2 is a cross-sectional view of the chuck assembly of the embodiment. [Figure 6] FIG. 3 is a cross-sectional view of the chuck assembly of the same embodiment. [Figure 7] FIG. 4 is a cross-sectional view of the chuck assembly of the same embodiment. [Figure 8] FIG. 11 is a cross-sectional view of a chuck assembly according to a second embodiment. [Figure 9] FIG. 13 is an exploded perspective view of a stopper assembly according to a fourth embodiment. [Figure 10] FIG. 2 is an exploded perspective view of the stopper assembly of the embodiment. [Figure 11] FIG. 4 is a cross-sectional view of the stopper assembly of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] (First embodiment) Please refer to Figures 1 and 2. Figures 1 and 2 show an example of a chuck assembly 10. The configuration of the chuck assembly 10 can be selected arbitrarily. The configuration of the chuck assembly 10 is not limited to the illustrated configuration.

[0025] (Chuck Assembly 10) In one example, the chuck assembly 10 is incorporated into a processing device. In one example, the processing device is configured to perform a predetermined processing on a workpiece. Examples of the processing device include a lathe, a drilling machine, a boring machine, a cylindrical grinding machine, a milling machine, and the like. In one example, the processing device includes a processing device main body, a support table T (see FIG. 6), and the chuck assembly 10, and the like.

[0026] The support table T is provided on the processing apparatus body. The chuck assembly 10 is configured to be detachable from the support table T. In one example, the chuck assembly 10 includes a collet chuck 20 and a stopper assembly 100. In one example, the stopper assembly 100 is configured to be detachable from the collet chuck 20.

[0027] In one example, possible states of the chuck assembly 10 include an unbonded state and a bonded state. In the unbonded state of the chuck assembly 10, the stopper assembly 100 is not bonded to the collet chuck 20. In the bonded state of the chuck assembly 10, the stopper assembly 100 is bonded to the collet chuck 20.

[0028] (Collet chuck 20) In one example, the central axis of collet chuck 20 or the central axis of stopper assembly 100 defines the central axis of chuck assembly 10. In one example, in a combined chuck assembly 10, collet chuck 20 and stopper assembly 100 have the same central axis.

[0029] In one example, the axial direction relative to the central axis of the collet chuck 20 or the axial direction relative to the central axis of the stopper assembly 100 includes a first axial direction and a second axial direction.

[0030] The first axis direction is a direction from the object to be grasped W toward the stopper assembly 100 when the object to be grasped W is used as a reference. The second axis direction is a direction from the stopper assembly 100 toward the object to be grasped W when the stopper assembly 100 is used as a reference.

[0031] In one example, the radial direction with respect to the central axis of the collet chuck 20 or the radial direction with respect to the central axis of the stopper assembly 100 includes an outward direction and an inward direction.

[0032] The outward direction is a direction away from the central axis of the collet chuck 20 or the central axis of the stopper assembly 100. The inward direction is a direction toward the central axis of the collet chuck 20 or the central axis of the stopper assembly 100.

[0033] (Stopper assembly 100) Please refer to Fig. 3. The configuration of the stopper assembly 100 can be selected arbitrarily. The configuration of the stopper assembly 100 is not limited to the illustrated configuration. In one example, the stopper assembly 100 is configured to determine the position of the object W to be grasped relative to the collet chuck 20 in the axial direction.

[0034] In one example, the stopper assembly 100 includes a stopper 200, a sleeve 300, and a pressing portion 400. In one example, the stopper 200 is inserted into the sleeve 300. In one example, the pressing portion 400 is coupled to the stopper 200.

[0035] (Collet chuck 20) Please refer to Figures 4 and 5. Figures 4 and 5 show a cross section of the chuck assembly 10 parallel to and passing through the central axis of the chuck assembly 10.

[0036] The configuration of the collet chuck 20 can be selected arbitrarily. The configuration of the collet chuck 20 is not limited to the exemplified configuration. In one example, the collet chuck 20 is configured to be able to grip the object W to be gripped.

[0037] A workpiece and a tool are examples of the grasped object W. Examples of the tool include a cutting tool, a drill, and a tap.

[0038] In one example, the graspable object W includes a first end W10 and a second end W20 in an axial direction. The first end W10 of the graspable object W is spaced apart in a first axial direction from a center of the graspable object W in the axial direction. The second end W20 of the graspable object W is spaced apart in a second axial direction from a center of the graspable object W in the axial direction.

[0039] In one example, possible states of the collet chuck 20 include a non-gripping state and a gripping state. In the non-gripping state, the collet chuck 20 does not grip the object W. In the gripping state, the collet chuck 20 grips the object W.

[0040] In one example, the collet chuck 20 includes a first axial end 20A and a second axial end 20B. The first end 20A is spaced apart in a first axial direction relative to a center of the collet chuck 20. The second end 20B is spaced apart in a second axial direction relative to the center of the collet chuck 20.

[0041] In one example, the collet chuck 20 includes an outer peripheral surface 20F. In one example, the outer peripheral surface 20F of the collet chuck 20 contacts a support table T of a processing device.

[0042] In one example, the collet chuck 20 includes an inner circumferential surface 20G. In one example, the inner circumferential surface 20G of the collet chuck 20 contacts the stopper assembly 100 or the object W to be grasped.

[0043] (Main body 30) In one example, the collet chuck 20 includes a body 30. In one example, the body 30 is a hollow shaft. In one example, the body 30 extends in an axial direction. In one example, the body 30 is configured to allow the stopper assembly 100 to be positioned within the body 30.

[0044] In one example, the main body 30 includes a coupling portion 31. In one example, the coupling portion 31 includes the first end 20A of the collet chuck 20. In one example, the coupling portion 31 is configured to be coupled to a support table T of a processing device. In one example, the coupling portion 31 includes a male thread 31A. The male thread 31A is coupled to a female thread provided on the support table T.

[0045] In one example, the main body 30 includes a general portion 32. In one example, the general portion 32 is provided on the second end 20B side of the collet chuck 20 relative to the coupling portion 31 in the axial direction.

[0046] In one example, the general portion 32 connects to the coupling portion 31. In one example, the general portion 32 does not include male threads. In one example, the outer peripheral surface 20F of the general portion 32 is a smooth curved surface.

[0047] In one example, the main body 30 includes a main body mounting portion 33. In one example, the main body mounting portion 33 includes an arrangement space 33A. In one example, the arrangement space 33A is formed so that the stopper assembly 100 can be disposed therein. In one example, the arrangement space 33A includes a hole extending in the axial direction. In one example, an inner circumferential surface 20G of the main body mounting portion 33 defines the arrangement space 33A.

[0048] (Grasping part 40) In one example, collet chuck 20 includes a gripping portion 40. In one example, gripping portion 40 is configured to grip a grasped object W. In one example, gripping portion 40 includes a second end 20B of collet chuck 20. In one example, gripping portion 40 extends in the axial direction. In one example, gripping portion 40 includes a gripping portion arrangement portion 41.

[0049] In one example, the grasping portion arrangement portion 41 includes an arrangement space 41A. In one example, the arrangement space 41A is formed so that the grasped object W can be arranged therein. In one example, the arrangement space 41A includes a hole extending in the axial direction.

[0050] In one example, the arrangement space 41A opens to the outside of the collet chuck 20 in the second axial direction. In one example, the opening of the arrangement space 41A corresponds to the opening of the gripping portion 40. In one example, the inner circumferential surface 20G of the gripping portion arrangement portion 41 defines the arrangement space 41A.

[0051] In one example, the gripping portion 40 includes a protrusion 42. In one example, the protrusion 42 is configured to protrude outward relative to the gripping portion arrangement portion 41 in the radial direction. In one example, the protrusion 42 includes an inclined surface 42A. In one example, the inclined surface 42A is configured such that the outer diameter of the protrusion 42 becomes smaller toward the first axial direction.

[0052] (Slit 50) In one example, collet chuck 20 includes a plurality of slits 50. In one example, the plurality of slits 50 are configured to facilitate contractive deformation of gripping portion 40. In one example, slits 50 extend in the axial direction. In one example, slits 50 are provided in gripping portion 40 and general portion 32.

[0053] In one example, the shrinking deformation of the collet chuck 20 includes deformation of the collet chuck 20 that narrows the width of the multiple slits 50. When the collet chuck 20 shrinks and deforms, a portion between one circumferentially adjacent slit 50 and the other slit 50 deforms radially inward. As the collet chuck 20 shrinks and deforms, the arrangement space 41A becomes smaller in the radial direction.

[0054] (Stopper 200) 4 and 5. The configuration of the stopper 200 can be selected arbitrarily. The configuration of the stopper 200 is not limited to the illustrated configuration. In one example, the stopper 200 is configured to support the grasped object W. In one example, the stopper 200 extends in the axial direction.

[0055] In one example, the stopper 200 includes a first axial end 200A and a second axial end 200B. The first end 200A is spaced apart in a first axial direction relative to a center of the stopper 200. The second end 200B is spaced apart in a second axial direction relative to a center of the stopper 200.

[0056] In one example, the stopper 200 includes an outer circumferential surface 200 F. In one example, the outer circumferential surface 200 F of the stopper 200 contacts an inner circumferential surface 300 G of the sleeve 300.

[0057] (Shaft portion 210) In one example, the stopper 200 includes a shaft portion 210. In one example, the shaft portion 210 includes a first end 200A of the stopper 200. In one example, the shaft portion 210 extends in an axial direction.

[0058] The configuration of the shaft portion 210 will be illustrated. In a first example, the shaft portion 210 includes a guide portion 211 and a general portion 212 (see FIGS. 4 and 5). In a second example, the shaft portion 210 includes the guide portion 211 and does not include the general portion 212.

[0059] In one example, the shaft portion 210 includes a guide portion 211. In one example, the guide portion 211 is configured to be able to be coupled to the pressing portion 400. In one example, the guide portion 211 is configured to be able to guide the pressing portion 400 in the axial direction in a state where the guide portion 211 is coupled to the pressing portion 400.

[0060] In one example, the guide portion 211 includes an external thread 211 A. In one example, the external thread 211 A is provided on the outer periphery of the guide portion 211.

[0061] In one example, the shaft portion 210 includes a general portion 212. In one example, the general portion 212 is provided on the second end 200B side of the stopper 200 with respect to the guide portion 211 in the axial direction.

[0062] In one example, the general portion 212 connects to the guide portion 211. In one example, the general portion 212 does not include male threads. In one example, the outer peripheral surface 200F of the general portion 212 is a smooth curved surface.

[0063] (Large diameter section 220) In one example, the stopper 200 includes an enlarged diameter portion 220. In one example, the enlarged diameter portion 220 is configured to facilitate expansive deformation of the sleeve 300. In one example, the enlarged diameter portion 220 extends axially.

[0064] In one example, the large diameter portion 220 is provided on the second end 200B side of the stopper 200 with respect to the shaft portion 210 in the axial direction.

[0065] In one example, the larger diameter portion 220 is connected to the shank portion 210. In an example where the shank portion 210 includes a general portion 212, the larger diameter portion 220 is connected to the general portion 212. In an example where the shank portion 210 does not include a general portion 212, the larger diameter portion 220 is connected to the guide portion 211.

[0066] In one example, the large diameter portion 220 includes an end surface 220A. In one example, the end surface 220A of the large diameter portion 220 faces the second axial direction. In one example, the end surface 220A of the large diameter portion 220 is flat.

[0067] In one example, the large diameter portion 220 includes an inclined portion 221. In one example, the inclined portion 221 is provided on the second end 200B side of the stopper 200 with respect to the shaft portion 210 in the axial direction.

[0068] In one example, the angled portion 221 connects to the shank portion 210. In an example where the shank portion 210 includes a general portion 212, the angled portion 221 connects to the general portion 212. In an example where the shank portion 210 does not include a general portion 212, the angled portion 221 connects to the guide portion 211.

[0069] In one example, the inclined portion 221 includes a first end 221A and a second end 221B in the axial direction. The first end 221A of the inclined portion 221 is spaced away from the first end 200A side of the stopper 200 with respect to the center of the inclined portion 221 in the axial direction. The second end 221B of the inclined portion 221 is spaced away from the second end 200B side of the stopper 200 with respect to the center of the inclined portion 221 in the axial direction.

[0070] In one example, outer circumferential surface 200F of inclined portion 221 is tapered. In one example, an outer diameter of first end 221A of inclined portion 221 is equal to an outer diameter of shaft portion 210. In one example, the outer diameter of inclined portion 221 increases from first end 221A of inclined portion 221 toward second end 221B of inclined portion 221.

[0071] In one example, the large diameter portion 220 includes a cylindrical portion 222. In one example, the cylindrical portion 222 is provided on the second end 200B side of the stopper 200 with respect to the inclined portion 221 in the axial direction. In one example, the cylindrical portion 222 is connected to the inclined portion 221.

[0072] In one example, the cylindrical portion 222 includes an end surface 220A of the large diameter portion 220. In one example, the outer diameter of the cylindrical portion 222 is constant. In one example, the outer diameter of the cylindrical portion 222 is equal to the outer diameter of the second end 221B of the inclined portion 221.

[0073] (Support part 230) In one example, the stopper 200 includes a support portion 230. In one example, the support portion 230 is configured to support the grasped object W. In one example, the support portion 230 is provided on the second end portion 200B side of the stopper 200 with respect to the inclined portion 221 in the axial direction.

[0074] In one example, the support portion 230 includes a support surface 231. In one example, the support surface 231 supports the object to be grasped W by contacting the object to be grasped W. The stopper assembly 100 is configured so that the position of the support surface 231 relative to the collet chuck 20 in the axial direction can be changed.

[0075] In one example, the support portion 230 includes a support shaft 232. In one example, the support shaft 232 includes a first end 232A and a second end 232B. The first end 232A of the support shaft 232 is spaced apart in a first axial direction relative to a center of the support shaft 232 in the axial direction. The second end 232B of the support shaft 232 is spaced apart in a second axial direction relative to a center of the support shaft 232 in the axial direction.

[0076] In one example, a first end 232A of the support shaft 232 is connected to the large diameter portion 220. In one example, the first end 232A of the support shaft 232 is connected to the cylindrical portion 222. In one example, the support shaft 232 protrudes from an end surface 220A of the cylindrical portion 222 in the second axial direction.

[0077] In one example, second end 232B of support shaft 232 constitutes second end 200B of stopper 200. In one example, support surface 231 is provided on support shaft 232. In one example, an end face of second end 232B of support shaft 232 constitutes support surface 231.

[0078] (Surface treatment section 240) In one example, stopper 200 includes a surface treatment 240. In one example, surface treatment 240 is a processed portion to improve the wear resistance of stopper 200. In one example, surface treatment 240 includes a hard metal or ceramic bonded to the surface of stopper 200. In one example, the hard metal or ceramic is bonded to the surface of stopper 200 by brazing.

[0079] The locations where the surface treatment portion 240 is provided will be illustrated. In a first example, the surface treatment portion 240 is provided on a part or all of the support surface 231. In a second example, the surface treatment portion 240 is provided on a part or all of the outer circumferential surface 200F of the support shaft 232. In a third example, the surface treatment portion 240 is provided on both the first and second examples.

[0080] In a fourth example, the surface treatment portion 240 is provided on a part or all of the outer circumferential surface 200F of the inclined portion 221. In a fifth example, the surface treatment portion 240 is provided on a part or all of the outer circumferential surface 200F of the cylindrical portion 222. In a sixth example, the surface treatment portion 240 is provided on both the fourth and fifth examples.

[0081] In a seventh example, the surface treatment portion 240 is provided on a part or all of the outer circumferential surface 200F of the guide portion 211. In an eighth example, the surface treatment portion 240 is provided on a part or all of the outer circumferential surface 200F of the general portion 212. In a ninth example, the surface treatment portion 240 is provided on both the seventh and eighth examples.

[0082] In a tenth example, the surface treatment portion 240 is provided in at least two locations among the third, sixth, and ninth examples. In an eleventh example, the surface treatment portion 240 is provided in at least two locations among the first, second, fourth, fifth, seventh, and eighth examples. However, the eleventh example does not overlap with the third, sixth, ninth, and tenth examples.

[0083] (Stopper 200) In one example, the stopper 200 includes an integrally formed shaft portion 210, a large diameter portion 220, and a support portion 230. The configuration of the stopper 200 will be illustrated.

[0084] In the first example, the stopper 200 is formed by machining a single material. The shaft portion 210, the large diameter portion 220, and the support portion 230 are provided on the single material. The shaft portion 210, the large diameter portion 220, and the support portion 230 are integrally formed.

[0085] In the second example, the stopper 200 includes a plurality of stopper constituents that are individually constructed. The plurality of stopper constituents are joined together to construct the stopper 200. Examples of means for joining the plurality of stopper constituents include mechanical joining, chemical joining, and metallurgical joining.

[0086] The plurality of stopper structures are exemplified. In a first example, the plurality of stopper structures include a first stopper structure, a second stopper structure, and a third stopper structure. In a second example, the plurality of stopper structures include a first stopper structure and a second stopper structure.

[0087] The first example of the multiple stopper constituents includes the following components. The first stopper constituent includes a shaft portion 210. The second stopper constituent includes a large diameter portion 220. The third stopper constituent includes a support portion 230. The first stopper constituent and the third stopper constituent are joined to the second stopper constituent. The shaft portion 210, the large diameter portion 220, and the support portion 230 are integrally formed.

[0088] The second example multiple stopper structures include the following structures: A first stopper structure includes a portion of the stopper 200 including the first end 200A of the stopper 200. A second stopper structure includes another portion of the stopper 200 including the second end 200B of the stopper 200.

[0089] In one example, the first stopper constituent includes the guide portion 211 of the shaft portion 210 and a part of the general portion 212 of the shaft portion 210. In one example, the second stopper constituent includes another part of the general portion 212 of the shaft portion 210, the large diameter portion 220, and the support portion 230. The first stopper constituent and the second stopper constituent are joined. The shaft portion 210, the large diameter portion 220, and the support portion 230 are integrally formed.

[0090] (Sleeve 300) In one example, the sleeve 300 is configured to couple the stopper 200 to the collet chuck 20. In one example, the sleeve 300 extends axially.

[0091] In one example, the sleeve 300 includes a first axial end 300A and a second axial end 300B. The first end 300A of the sleeve 300 is spaced in a first axial direction relative to an axial center of the sleeve 300. The second end 300B of the sleeve 300 is spaced in a second axial direction relative to an axial center of the sleeve 300.

[0092] In one example, the sleeve 300 includes an outer circumferential surface 300F. In one example, the outer circumferential surface 300F of the sleeve 300 contacts the inner circumferential surface 20G of the collet chuck 20.

[0093] In one example, the sleeve 300 includes an inner circumferential surface 300G. In one example, the inner circumferential surface 300G of the sleeve 300 contacts the outer circumferential surface 200F of the stopper 200.

[0094] In one example, the sleeve 300 includes an arrangement space 301. In one example, the arrangement space 301 includes a hole that axially penetrates the sleeve 300. In one example, the arrangement space 301 is formed so that the stopper 200 can be disposed therein. In one example, an inner circumferential surface 300G of the sleeve 300 defines the arrangement space 301.

[0095] In one example, the sleeve 300 includes a base portion 310. In one example, the base portion 310 includes a first end 300A of the sleeve 300. In one example, the base portion 310 extends axially.

[0096] In one example, the sleeve 300 includes an enlarged portion 320. In one example, the enlarged portion 320 includes a second end 300B of the sleeve 300. In one example, the enlarged portion 320 is configured to expand and deform upon contact with the large diameter portion 220 of the stopper 200.

[0097] In one example, the expansion deformation of the expansion portion 320 includes a deformation of the expansion portion 320 that increases the width of the multiple slits 321. When the expansion deformation of the expansion portion 320 occurs, a portion between one slit 321 and the other slit 321 adjacent to each other in the circumferential direction deforms radially outward. As the expansion deformation of the expansion portion 320 occurs, the arrangement space 301 becomes larger in the radial direction.

[0098] The state of the sleeve 300 or the stopper assembly 100 in which the expansion portion 320 is not expanded and deformed is referred to as the "unexpanded state." The state of the sleeve 300 or the stopper assembly 100 in which the expansion portion 320 is expanded and deformed is referred to as the "expanded state."

[0099] The outer diameter of the enlarged portion 320 in the expanded sleeve 300 is greater than the outer diameter of the enlarged portion 320 in the unexpanded sleeve 300. The outer diameter of the enlarged portion 320 in the expanded sleeve 300 is determined so that the stopper 200 can be coupled to the collet chuck 20.

[0100] (Pressing section 400) In one example, the pressing portion 400 is configured to determine a position of the sleeve 300 relative to the stopper 200 in the axial direction. In one example, the pressing portion 400 is configured to be coupled to the stopper 200. In one example, the pressing portion 400 is configured to move axially relative to the stopper 200 in a state coupled to the stopper 200.

[0101] In one example, the pressing portion 400 is a nut. In one example, the pressing portion 400 includes an internal thread 401. The internal thread 401 is coupled to the external thread 211A of the guide portion 211.

[0102] In one example, the pressing portion 400 includes a pressing surface 402. In one example, the pressing surface 402 is a flat surface. When the stopper 200 is inserted into the sleeve 300 and the pressing portion 400 is coupled to the guide portion 211, the pressing surface 402 faces the first end portion 300A of the sleeve 300.

[0103] (Axial dimensions) In one example, the following dimensions are defined as the dimensions of the collet chuck 20 in the axial direction: The length of the main body 30 in the axial direction is referred to as the "main body length." The length of the gripping portion 40 in the axial direction is referred to as the "gripping portion length."

[0104] In one example, the following dimensions are defined as the dimensions of stopper 200 in the axial direction: The length of shaft portion 210 in the axial direction is referred to as the "shank length." The length of guide portion 211 in the axial direction is referred to as the "guide length." The length of general portion 212 in the axial direction is referred to as the "general portion length."

[0105] The length of large diameter portion 220 in the axial direction is referred to as the "large diameter portion length." The length of inclined portion 221 in the axial direction is referred to as the "inclined portion length." The length of cylindrical portion 222 in the axial direction is referred to as the "cylindrical portion length." The length of support portion 230 in the axial direction is referred to as the "support portion length."

[0106] The relationship between the shaft length and the body length can be set arbitrarily. In a first example, the shaft length is longer than the body length. In a second example, the shaft length is shorter than the body length. In a third example, the shaft length is equal to the body length.

[0107] The relationship between the length of the support portion and the length of the gripping portion can be set arbitrarily. In a first example, the length of the support portion is longer than the length of the gripping portion. In a second example, the length of the support portion is shorter than the length of the gripping portion. In a third example, the length of the support portion is equal to the length of the gripping portion.

[0108] The relationship between the shank length and the large diameter length can be set arbitrarily. In a first example, the shank length is longer than the large diameter length. In a second example, the shank length is shorter than the large diameter length. In a third example, the shank length is equal to the large diameter length.

[0109] The relationship between the shaft length and the inclined portion length can be set arbitrarily. In a first example, the shaft length is longer than the inclined portion length. In a second example, the shaft length is shorter than the inclined portion length. In a third example, the shaft length is equal to the inclined portion length.

[0110] The relationship between the shaft length and the cylindrical length can be set arbitrarily. In a first example, the shaft length is longer than the cylindrical length. In a second example, the shaft length is shorter than the cylindrical length. In a third example, the shaft length is equal to the cylindrical length.

[0111] The relationship between the shaft length and the support length can be set arbitrarily. In a first example, the shaft length is longer than the support length. In a second example, the shaft length is shorter than the support length. In a third example, the shaft length is equal to the support length.

[0112] The relationship between the length of the guide portion and the length of the general portion can be set arbitrarily. In a first example, the length of the guide portion is longer than the length of the general portion. In a second example, the length of the guide portion is shorter than the length of the general portion. In a third example, the length of the guide portion is equal to the length of the general portion.

[0113] The relationship between the large diameter portion length and the support portion length can be set arbitrarily. In a first example, the large diameter portion length is longer than the support portion length. In a second example, the large diameter portion length is shorter than the support portion length. In a third example, the large diameter portion length is equal to the support portion length.

[0114] The relationship between the length of the inclined portion and the length of the supporting portion can be set arbitrarily. In a first example, the length of the inclined portion is longer than the length of the supporting portion. In a second example, the length of the inclined portion is shorter than the length of the supporting portion. In a third example, the length of the inclined portion is equal to the length of the supporting portion.

[0115] The relationship between the length of the cylinder and the length of the support can be set arbitrarily. In a first example, the length of the cylinder is longer than the length of the support. In a second example, the length of the cylinder is shorter than the length of the support. In a third example, the length of the cylinder is equal to the length of the support.

[0116] The relationship between the length of the inclined portion and the length of the cylindrical portion can be set arbitrarily. In a first example, the length of the inclined portion is longer than the length of the cylindrical portion. In a second example, the length of the inclined portion is shorter than the length of the cylindrical portion. In a third example, the length of the inclined portion is equal to the length of the cylindrical portion.

[0117] (Radial dimensions) In one example, the following dimensions are defined as the radial dimensions of the collet chuck 20: The inner diameter of the arrangement space 33A of the main body 30 is referred to as the "main body inner diameter." The inner diameter of the arrangement space 41A of the gripping portion 40 is referred to as the "gripping portion inner diameter."

[0118] In one example, the main body inner diameter is defined by the smallest inner diameter of the arrangement space 33A of the main body 30. In one example, the gripping portion inner diameter is defined by the smallest inner diameter of the arrangement space 41A of the gripping portion 40.

[0119] In one example, the following dimensions are defined as the radial dimensions of stopper 200: The outer diameter of shaft portion 210 is referred to as the "shaft outer diameter." The outer diameter of large diameter portion 220 is referred to as the "large diameter portion outer diameter." The outer diameter of support portion 230 is referred to as the "support portion outer diameter."

[0120] The outer diameter of the sleeve 300 in an unexpanded state is referred to as the "sleeve outer diameter." The inner diameter of the arrangement space 301 of the sleeve 300 is referred to as the "sleeve inner diameter."

[0121] In one example, the shaft outer diameter is defined by the maximum outer diameter of shaft portion 210. In one example, the larger diameter portion outer diameter is defined by the maximum outer diameter of larger diameter portion 220. In one example, the support portion outer diameter is defined by the maximum outer diameter of support portion 230.

[0122] In one example, the sleeve outer diameter is defined by the maximum outer diameter of the sleeve 300. In one example, the sleeve inner diameter is defined by the minimum inner diameter of the arrangement space 301 of the sleeve 300.

[0123] In one example, the relationship between the radial dimensions of the collet chuck 20 and the stopper 200 is set as follows.

[0124] The inner diameter of the gripping portion is smaller than the inner diameter of the main body. The outer diameter of the shank is smaller than the inner diameter of the main body. The outer diameter of the shank is larger than the inner diameter of the gripping portion. The outer diameter of the large diameter portion is smaller than the inner diameter of the main body. The outer diameter of the large diameter portion is larger than the inner diameter of the gripping portion. The outer diameter of the large diameter portion is larger than the outer diameter of the shank.

[0125] The outer diameter of the support portion is smaller than the inner diameter of the grip portion. The outer diameter of the support portion is smaller than the outer diameter of the shaft portion. The outer diameter of the support portion is smaller than the outer diameter of the large diameter portion.

[0126] The outer diameter of the sleeve is smaller than the inner diameter of the main body. The outer diameter of the sleeve is larger than the inner diameter of the gripping portion. The inner diameter of the sleeve is larger than the outer diameter of the shaft portion. The inner diameter of the sleeve is smaller than the outer diameter of the large diameter portion.

[0127] In one example, the difference between the sleeve outer diameter and the body inner diameter is determined to reduce wobbling of the sleeve 300. The smaller the difference between the sleeve outer diameter and the body inner diameter, the less likely the sleeve 300 will wobble.

[0128] In one example, the difference between the inner diameter of the sleeve and the outer diameter of the shaft is determined to suppress rattling of the sleeve 300. The smaller the difference between the inner diameter of the sleeve and the outer diameter of the shaft, the less likely rattling of the sleeve 300 occurs.

[0129] In one example, the difference between the support portion outer diameter and the gripping portion inner diameter is determined so that the gripping force of the gripping portion 40 falls within a predetermined range. When the gripping force of the gripping portion 40 falls within the predetermined range, the gripping object W is properly gripped by the gripping portion 40.

[0130] (Stopper assembly 100) 4 and 5. In one example, possible states of the stopper assembly 100 include an uncoupled state and a coupled state. In the uncoupled state of the stopper assembly 100, the sleeve 300 and the pressing portion 400 are not coupled to the stopper 200. In the coupled state of the stopper assembly 100, the sleeve 300 and the pressing portion 400 are coupled to the stopper 200.

[0131] In one example, the central axis of the stopper 200 or the central axis of the sleeve 300 defines the central axis of the stopper assembly 100. In one example, in the stopper assembly 100 in a combined state, the stopper 200, the sleeve 300, and the pressing portion 400 have the same central axis.

[0132] In one example, the stopper assembly 100 in the coupled state includes the following relationship: The stopper 200 is disposed in the arrangement space 301 of the sleeve 300. The pressing portion 400 is coupled to the guide portion 211. The pressing surface 402 contacts the first end 300A of the sleeve 300.

[0133] With respect to the stopper assembly 100 in a coupled state, the position of the sleeve 300 relative to the stopper 200 in the axial direction is referred to as the “sleeve position.” In one example, the range for the sleeve position is divided into a first range and a second range.

[0134] When the sleeve position is within the first range, the state of the sleeve 300 is the non-expanded state. Fig. 4 shows an example of a case when the sleeve position is within the first range.

[0135] When the sleeve position is within the second range, the state of the sleeve 300 is the expanded state. Figure 5 shows an example of a case when the sleeve position is within the second range.

[0136] (How to use) 4 to 7. In one example, the collet chuck 20 and the stopper assembly 100 are combined as follows: In one example, the object to be grasped W is a workpiece. In one example, the workpiece is a shaft.

[0137] In one example, the graspable object W includes a first end surface W11 and a second end surface W21. The first end surface W11 is provided at a first end W10 of the graspable object W. In one example, the first end surface W11 is a flat surface. The second end surface W21 is provided at a second end W20 of the graspable object W. In one example, the second end surface W21 is a flat surface.

[0138] The stopper assembly 100 in a coupled and unexpanded state is placed in the arrangement space 33A of the collet chuck 20. The object to be grasped W is placed in the arrangement space 41A of the collet chuck 20. The first end surface W11 of the object to be grasped W contacts the support surface 231 of the support portion 230 of the stopper 200.

[0139] The object to be grasped W includes a grasp target portion W30 and a protrusion portion W40. The grasp target portion W30 is a portion of the object to be grasped W that is arranged in the arrangement space 41A. The protrusion portion W40 is a portion of the object to be grasped W that is arranged outside the collet chuck 20.

[0140] The length of the gripping portion W30 in the axial direction and the protruding length, which is the length of the protruding portion W40 in the axial direction, change depending on the position of the object to be gripped W relative to the collet chuck 20 in the axial direction.

[0141] The position of the object to be grasped W relative to the collet chuck 20 in the axial direction changes depending on the position of the support surface 231 relative to the collet chuck 20 in the axial direction.

[0142] The position of the support surface 231 relative to the collet chuck 20 in the axial direction is determined so that the protruding length of the object to be grasped W becomes a target length.

[0143] Fig. 6 shows an example of a state in which the protruding length of the grasped object W is set to a first target length. Fig. 7 shows an example of a state in which the protruding length of the grasped object W is set to a second target length that is longer than the first target length.

[0144] The position of the pressing portion 400 relative to the stopper 200 in the axial direction is changed so that the state of the sleeve 300 changes from a non-expanded state to an expanded state. The pressing portion 400 moves in the second axial direction relative to the stopper 200, whereby the sleeve 300 moves in the second axial direction relative to the stopper 200.

[0145] As the sleeve 300 moves, the expanded portion 320 of the sleeve 300 comes into contact with the large diameter portion 220 of the stopper 200, and the expanded portion 320 is expanded and deformed. The state of the sleeve 300 changes from the non-expanded state to the expanded state.

[0146] As a result of the sleeve 300 being in the expanded state, the outer circumferential surface 300F of the sleeve 300 is pressed against the inner circumferential surface 20G of the collet chuck 20. The expanded portion 320 of the sleeve 300 is sandwiched between the main body 30 of the collet chuck 20 and the large diameter portion 220 of the stopper 200.

[0147] The position of the stopper assembly 100 in the axial direction relative to the collet chuck 20 is fixed. The state of the chuck assembly 10 changes from the uncoupled state to the coupled state.

[0148] The coupled chuck assembly 10 is inserted into the support base T. In one example, the support base T includes a tapered portion TA. In one example, the tapered portion TA is configured to promote contractive deformation of the gripping portion 40 of the collet chuck 20. In one example, the inner diameter of the tapered portion TA becomes smaller toward the first axial direction.

[0149] Axial movement of the chuck assembly 10 relative to the support base T brings the inclined surface 42A of the collet chuck 20 into contact with the tapered portion TA. The contact between the inclined surface 42A of the collet chuck 20 and the tapered portion TA causes the gripping portion 40 to shrink and deform.

[0150] The shrinking deformation of the gripping portion 40 causes the inner circumferential surface 20G of the gripping portion 40 to be pressed against the outer circumferential surface WF of the object to be gripped W. The object to be gripped W is gripped by the gripping portion 40 due to contact between the inner circumferential surface 20G of the gripping portion 40 and the outer circumferential surface WF of the object to be gripped W. The state of the collet chuck 20 changes from a non-gripped state to a gripped state.

[0151] When the object to be grasped W is a workpiece, the object to be grasped W is machined while being gripped by the collet chuck 20. When the object to be grasped W is a tool, the object to be grasped W is machined by the tool while being gripped by the collet chuck 20.

[0152] (Work process) In one example, the work steps related to the processing device include a first step, a second step, a third step, a fourth step, and a fifth step.

[0153] The first step includes attaching the chuck assembly 10 in a coupled and gripped state to a support table T. In one example, a workpiece or a tool to be gripped W is gripped by the collet chuck 20 so that the protruding length is a first target length (see FIG. 6).

[0154] The second step includes a step of machining the workpiece, which is the object to be grasped W, or a step of machining the workpiece by a tool, which is the object to be grasped W.

[0155] The third step includes the operations of interrupting the machining of the workpiece or the machining by the tool, removing the chuck assembly 10 from the support table T, and removing the object to be gripped W from the collet chuck 20. The chuck assembly 10 is maintained in the coupled state.

[0156] The fourth step includes a reattachment operation for the object to be grasped W and a reattachment operation for the chuck assembly 10.

[0157] The reattachment operation of the object to be grasped W includes the operation of attaching the object to be grasped W removed in the third step, or a different object to be grasped W in place of the object to be grasped W, to the collet chuck 20.

[0158] The reattachment operation of the chuck assembly 10 includes the operation of attaching the chuck assembly 10, which is maintained in a coupled and gripped state, to the support table T after the reattachment operation of the object to be gripped W.

[0159] When the protruding length of the object W to be grasped is set to the same length as the protruding length in the first step in the reattachment operation of the object W to be grasped, the object W is attached to the chuck assembly 10 removed from the support base T in the third step.

[0160] When the protruding length of the object to be grasped W is set to a length different from the protruding length in the first step during the reattachment operation of the object to be grasped W, the state of the chuck assembly 10 removed from the support base T in the third step is changed to an uncoupled state.

[0161] In one example, the position of the stopper assembly 100 relative to the collet chuck 20 in the axial direction is changed so that the protruding length of the object to be grasped W becomes the second target length (see FIG. 7). The state of the chuck assembly 10 is changed to the coupled state.

[0162] The fifth step includes a step of machining the workpiece, which is the object to be grasped W, or a step of machining the workpiece by a tool, which is the object to be grasped W.

[0163] Second embodiment Please refer to Fig. 8. The chuck assembly 10 of this embodiment is configured based on the first embodiment. The chuck assembly 10 of this embodiment includes configurations common to the premise embodiment. The chuck assembly 10 of this embodiment includes configurations different from the premise embodiment in the following respects.

[0164] In one example, the large diameter portion 220 includes a tapered portion 221. In one example, the large diameter portion 220 does not include the cylindrical portion 222 illustrated in the previous embodiment. In one example, the tapered portion 221 includes an end surface 220A of the large diameter portion 220.

[0165] In one example, support portion 230 of stopper 200 is provided at an end portion of inclined portion 221. In one example, support shaft 232 of support portion 230 protrudes from end surface 220A of inclined portion 221 in the second axial direction.

[0166] In one example, the stopper 200 includes an outer circumferential support portion 500. In one example, the outer circumferential support portion 500 is configured to contact an inner circumferential surface 300G of the sleeve 300, thereby suppressing rattling of the sleeve 300.

[0167] In one example, the outer peripheral support portion 500 is provided on the outer periphery of the guide portion 211 or the outer periphery of the general portion 212 of the shaft portion 210. In one example, the outer peripheral support portion 500 is provided on the end portion of the guide portion 211 or the end portion of the general portion 212.

[0168] The relationship between the outer periphery support part 500 and the shaft part 210 will be illustrated. In a first example, the outer periphery support part 500 is integrally formed with the shaft part 210. In a second example, the outer periphery support part 500 is configured so as to be detachable from the shaft part 210.

[0169] The outer diameter of the outer circumferential support portion 500 is referred to as the "outer diameter of the outer circumferential support portion." In one example, the outer diameter of the outer circumferential support portion is larger than the outer diameter of the shaft portion.

[0170] In one example, the difference between the inner diameter of the sleeve and the outer diameter of the outer circumferential support portion is determined to suppress rattling of the sleeve 300. The smaller the difference between the inner diameter of the sleeve and the outer diameter of the outer circumferential support portion, the less likely rattling of the sleeve 300 occurs.

[0171] Third embodiment The chuck assembly 10 of this embodiment is configured based on the first or second embodiment. The chuck assembly 10 of this embodiment includes configurations common to the prerequisite embodiment. The chuck assembly 10 of this embodiment includes configurations different from the prerequisite embodiment in the following respects.

[0172] In one example, the support portion 230 does not include the support shaft 232 illustrated in the above embodiment. In one example, the end surface 220A of the large diameter portion 220 constitutes the support surface 231 of the support portion 230.

[0173] (Fourth embodiment) Please refer to Figures 9 to 11. The chuck assembly 10 of this embodiment is configured based on one or more of the first to third embodiments. The chuck assembly 10 of this embodiment includes configurations in common with the underlying embodiments. The chuck assembly 10 of this embodiment includes configurations that differ from the underlying embodiments in the following respects.

[0174] (Stopper 200) In one example, the stopper 200 includes a plurality of stopper formations P. In one example, the plurality of stopper formations P includes a first stopper formation P1 and a second stopper formation P2.

[0175] The first stopper constituent body P1 and the second stopper constituent body P2 are joined to form the stopper 200. In a state in which the first stopper constituent body P1 and the second stopper constituent body P2 are joined, the shaft portion 210, the large diameter portion 220, and the support portion 230 are integrally formed.

[0176] In one example, a tool is used to join or separate the first stopper component P1 and the second stopper component P2. In one example, the tool includes a fixed tool and an operating tool. In one example, the fixed tool prevents the first stopper component P1 from rotating. In one example, the operating tool rotates the second stopper component P2 relative to the first stopper component P1.

[0177] (First stopper structure P1) In one example, the first stopper constituent body P1 includes a shaft portion 210 and a large diameter portion 220. In one example, the shaft portion 210 and the large diameter portion 220 are integrally formed.

[0178] (Large diameter section 220) In one example, the large diameter portion 220 includes a coupling portion 223. In one example, the coupling portion 223 is configured to couple with the second stopper member P2. In one example, the coupling portion 223 is provided so as to straddle the cylindrical portion 222 and the inclined portion 221.

[0179] In one example, the coupling portion 223 includes an arrangement space 223A. In one example, the arrangement space 223A opens to an end surface 220A of the large diameter portion 220. In one example, the arrangement space 223A is formed so that a part of the second stopper constituent P2 can be disposed therein. In one example, the arrangement space 223A includes a hole extending in the axial direction.

[0180] In one example, the coupling portion 223 includes an internal thread 223B. In one example, the internal thread 223B is provided on an inner circumferential surface of the coupling portion 223 that defines the arrangement space 223A. In one example, the internal thread 223B is coupled to the second stopper constituent P2.

[0181] (Second stopper structure P2) In one example, the second stopper structure P2 includes a support portion 230, a coupling portion 250, and a flange 260. In one example, the support portion 230, the coupling portion 250, and the flange 260 are integrally formed.

[0182] (Connection part 250) In one example, the coupling portion 250 is configured to couple with the first stopper constituent P1. In one example, the coupling portion 250 includes a coupling shaft 251. In one example, the coupling shaft 251 extends in the axial direction. In one example, the coupling shaft 251 is disposed in the arrangement space 223A of the large diameter portion 220.

[0183] In one example, the coupling shaft 251 includes an external thread 251A. The external thread 251A couples with the internal thread 223B of the large diameter portion 220. In one example, the external thread 251A of the coupling shaft 251 is a reverse thread.

[0184] (Flange 260) In one example, the flange 260 is provided at a portion of the second stopper structure P2 where the support portion 230 and the coupling portion 250 are coupled.

[0185] In one example, the flange 260 includes an end surface 261. In one example, the end surface 261 includes a first end surface 261A and a second end surface 261B.

[0186] In one example, the first end surface 261A is spaced in a first axial direction from a center of the flange 260 in the axial direction. In one example, the first end surface 261A faces in the first axial direction. In one example, the first end surface 261A is a plane perpendicular to the central axis of the stopper 200.

[0187] In one example, the coupling shaft 251 protrudes from a first end surface 261A of the flange 260 in a first axial direction.

[0188] In one example, the second end surface 261B is spaced in a second axial direction from the center of the axial flange 260. In one example, the second end surface 261B faces in the second axial direction. In one example, the second end surface 261B is a plane perpendicular to the central axis of the stopper 200.

[0189] In one example, the support shaft 232 protrudes from the second end surface 261B of the flange 260 in the second axial direction.

[0190] In one example, the flange 260 includes an outer circumferential surface 262. The outer circumferential surface 262 faces radially outward. In one example, the outer circumferential surface 262 is disposed between a first end surface 261A and a second end surface 261B.

[0191] (Second stopper structure P2) In one example, the second stopper constituent body P2 is divided into a first type second stopper constituent body P2 for which additional machining is planned to be performed and a second type second stopper constituent body P2 for which additional machining is not planned to be performed.

[0192] In one example, additional machining of the first type of second stopper structure P2 is performed with the chuck assembly 10 in a coupled state, with the chuck assembly 10 in a non-coupled state, or with the second stopper structure P2 alone.

[0193] In one example, the first type second stopper constituent P2 is made of a material having excellent workability. In one example, the material of the first type second stopper constituent P2 is a metal having excellent workability. Examples of metals having excellent workability include brass, carbon tool steel, copper, aluminum, and stainless steel. In one example, the material of the first type second stopper constituent P2 is a non-metal having excellent workability. Examples of non-metals having excellent workability include resin and wood.

[0194] In one example, in the first type second stopper structure P2, the surface treatment portion 240 is not provided at the first to third example locations exemplified in the first embodiment as locations where the surface treatment portion 240 is provided.

[0195] In one example, the additional work performed on the first type second stopper structure P2 includes one or more of a first additional work, a second additional work, and a third additional work.

[0196] In one example, the first additional machining is performed on the support surface 231 so as to improve the perpendicularity of the support surface 231 with respect to the central axis of the stopper 200. When the material of the second stopper constituent body P2 has excellent workability, the workability of the support surface 231 in the first additional machining is improved.

[0197] In one example, the second additional machining is performed on the support shaft 232 so that the outer diameter of the support portion becomes an outer diameter suitable for the outer diameter of the grasped object W. When the material of the second stopper constituent body P2 has excellent workability, the workability of the support shaft 232 in the second additional machining is improved.

[0198] In one example, the third additional processing is performed on the supporting surface 231 so that the shape of the supporting surface 231 becomes a shape suitable for the shape of the grasped object W. When the material of the second stopper constituent body P2 has excellent processability, the processability of the supporting surface 231 in the third additional processing is improved.

[0199] In one example, the end surface of the object W facing the support surface 231 includes a step. In one example, the end surface of the object W includes a first end surface and a second end surface separated by the step. The first end surface is closer to the support surface 231 than the second end surface in the axial direction.

[0200] In one example, the third additional processing is performed so that a portion that allows one of the first end face and the second end face of the object to be grasped W to be released is formed on the support surface 231. In one example, the support surface 231 to which the third additional processing has been performed includes a step. In one example, the support surface 231 includes a contact surface and a non-contact surface that are divided by the step.

[0201] In one example, the support portion 230 supports the object to be grasped W by contacting the contact surface of the support surface 231 with one of the first end surface and the second end surface of the object to be grasped W. The non-contact surface of the support surface 231 faces the other of the first end surface and the second end surface of the object to be grasped W with a gap therebetween and does not contact the object to be grasped W.

[0202] (Engagement portion 270) In one example, the stopper 200 includes an engagement portion 270. In one example, the engagement portion 270 is configured to engage with one or both of a fixing tool and an operating tool.

[0203] In one example, the engagement portion 270 includes a first engagement portion 271. In one example, the first engagement portion 271 is configured to engage with a stationary tool. In one example, the stationary tool is a wrench.

[0204] In one example, the first engagement portion 271 is provided on the first stopper formation P1. In one example, the first engagement portion 271 is provided on the shaft portion 210. In one example, the first engagement portion 271 is provided on the guide portion 211.

[0205] In one example, the first engagement portion 271 includes two flat surfaces 271A. In one example, the two flat surfaces 271A are configured as cut portions of the male thread 211A.

[0206] In one example, the two flat surfaces 271A have a point-symmetric relationship with respect to the central axis of the stopper 200. In one example, the two flat surfaces 271A engage with an engagement portion of a wrench.

[0207] In one example, the engagement portion 270 includes a second engagement portion 272. In one example, the second engagement portion 272 is configured to engage with an operating tool. In one example, the operating tool is a wrench.

[0208] In one example, the second engagement portion 272 is provided on the second stopper formation P2. In one example, the second engagement portion 272 is provided on the support portion 230. In one example, the second engagement portion 272 is provided on the flange 260.

[0209] In one example, the second engagement portion 272 includes two flat surfaces 272 A. In one example, the two flat surfaces 272 A are configured as portions of the outer circumferential surface 262 of the flange 260 that are cut.

[0210] In one example, the two flat surfaces 272A have a point-symmetric relationship with respect to the central axis of the stopper 200. In one example, the two flat surfaces 272A engage with an engagement portion of a wrench.

[0211] (Sleeve 300) In one example, the enlarged portion 320 of the sleeve 300 includes a sloped portion 322. In one example, the sloped portion 322 is provided in a portion including the second end 300B of the sleeve 300. In one example, the sloped portion 322 is configured such that the outer diameter of the sloped portion 322 decreases toward the end face of the second end 300B.

[0212] In a cross section parallel to the central axis of stopper 200, the angle formed between a straight line parallel to the central axis of stopper 200 and outer circumferential surface 300F of inclined portion 322 is referred to as the "inclination angle."

[0213] In one example, the inclination angle is determined so that outer circumferential surface 300F of inclined portion 322 and inner circumferential surface 20G of collet chuck 20 are parallel or approaching parallelism when sleeve 300 is in the expanded state.

[0214] (Pressing section 400) In one example, an operating tool is used to axially move the pressing portion 400 relative to the stopper 200. In one example, the operating tool rotates the pressing portion 400.

[0215] In one example, the pressing portion 400 includes an outer circumferential surface 403. The outer circumferential surface 403 faces radially outward. In one example, the pressing portion 400 includes an engagement portion 410. In one example, the engagement portion 410 is configured to engage with an operating tool. In one example, the operating tool is a wrench.

[0216] In one example, the engagement portion 410 includes two flat surfaces 410 A. In one example, the two flat surfaces 410 A are configured as portions obtained by cutting the outer circumferential surface 403 of the pressing portion 400.

[0217] In one example, the two flat surfaces 410A have a point-symmetric relationship with respect to the central axis of the pressing portion 400. In one example, the two flat surfaces 410A engage with an engagement portion of a wrench.

[0218] (effect) The following effects can be given as examples of effects obtained by the embodiment.

[0219] In one example, the stopper assembly 100 and the stopper 200 include the following configuration: The stopper 200 is inserted into a sleeve 300 that is coupled to the collet chuck 20. The stopper 200 includes a shaft portion 210, a large diameter portion 220, and a support portion 230 that are integrally formed.

[0220] The shaft portion 210 includes a guide portion 211 that guides a pressing portion 400 that moves the sleeve 300 relative to the stopper 200 in the axial direction of the stopper 200. The large diameter portion 220 is configured to expand and deform the sleeve 300.

[0221] The support portion 230 is provided on the opposite side of the large diameter portion 220 from the shaft portion 210 in the axial direction of the stopper 200, and includes a support surface 231 for supporting the object W to be grasped.

[0222] The stopper 200, the sleeve 300, and the pressing portion 400 constitute a stopper assembly 100. The collet chuck 20 and the stopper assembly 100 constitute a chuck assembly 10. The stopper assembly 100 is inserted into the collet chuck 20.

[0223] The collet chuck 20 includes a gripping portion 40 in which an object to be gripped W is placed. The object to be gripped W is inserted into the gripping portion 40 of the collet chuck 20. The object to be gripped W is supported by a support surface 231 of the stopper 200.

[0224] The pressing portion 400 is operated so as to move relative to the stopper 200 in the axial direction of the stopper 200. As the pressing portion 400 moves, the sleeve 300 moves relative to the stopper 200 in the axial direction of the stopper 200. As the sleeve 300 moves, the sleeve 300 comes into contact with the large diameter portion 220 of the stopper 200.

[0225] The sleeve 300 is expanded and deformed by contact between the sleeve 300 and the large diameter portion 220. The sleeve 300 is pressed against the collet chuck 20 by the expansion and deformation of the sleeve 300.

[0226] The sleeve 300 is pressed against the collet chuck 20, whereby the position of the stopper 200 relative to the collet chuck 20 in the axial direction of the stopper 200 is determined.

[0227] By determining the position of the stopper 200, the position of the support surface 231 relative to the collet chuck 20 is determined. By determining the position of the support surface 231, the protruding length of the object W to be grasped is determined.

[0228] The above-described configuration provides the following advantages, for example: Since the shaft portion 210, the large diameter portion 220, and the support portion 230 are integrally configured, the position of the support surface 231 relative to the collet chuck 20 in the axial direction of the stopper 200 can be adjusted by operating the pressing portion 400. It is expected that the workability in adjusting the protruding length of the object to be grasped W will be improved.

[0229] In one example, the support portion 230 includes a support shaft 232 extending in the axial direction of the stopper 200. The support shaft 232 includes a support surface 231.

[0230] According to the above-mentioned configuration, for example, the following effects can be obtained: By disposing the support shaft 232 in the gripping portion 40 of the collet chuck 20, a small-sized object to be grasped W can be supported by the support surface 231. In one example, the small-sized object to be grasped W has a shorter length in the axial direction or a smaller outer diameter than a standard-sized object to be grasped W.

[0231] In one example, the outer diameter of the support shaft 232 is smaller than the outer diameter of the large diameter portion 220 .

[0232] According to the above-mentioned configuration, for example, the following effects can be obtained: Compared to a case where the outer diameter of the support shaft 232 is larger than or equal to the outer diameter of the large diameter portion 220, the support shaft 232 is easier to arrange in the gripping portion 40 of the collet chuck 20.

[0233] In one example, the length of the support shaft 232 in the axial direction of the stopper 200 is equal to or greater than the length of the large diameter portion 220 in the axial direction of the stopper 200 .

[0234] The above configuration provides the following advantages, for example: The support surface 231 is spaced farther from the large diameter portion 220 than when the length of the support shaft 232 in the axial direction of the stopper 200 is less than the length of the large diameter portion 220 in the axial direction of the stopper 200. The support surface 231 can be easily brought closer to the opening of the arrangement space 33A of the collet chuck 20.

[0235] In one example, the guide portion 211 is configured to include a portion that is located outside the collet chuck 20 when the stopper 200 is inserted into the collet chuck 20 .

[0236] According to the above-mentioned configuration, for example, the following effects can be obtained: The operability of the pressing part 400 coupled to the guide part 211 is improved.

[0237] In one example, the stopper assembly 100 includes a stopper 200 , a sleeve 300 , and a pressing portion 400 .

[0238] According to the above-mentioned configuration, for example, the following effects can be obtained: It is expected that the workability in adjusting the protruding length of the object to be grasped W will be improved.

[0239] (Effect 2) The following effects can be given as examples of effects obtained by the embodiment.

[0240] In one example, the chuck assembly 10 includes a stopper 200 .

[0241] According to the above-mentioned configuration, for example, the following effects can be obtained: The accuracy of the operation of adjusting the protruding length of the object to be grasped W is improved; The workability of the reattachment operation of the object to be grasped W is improved.

[0242] In one example, the stopper 200 includes a shaft portion 210, a large diameter portion 220, and a support portion 230 that are integrally formed.

[0243] According to the above-mentioned configuration, for example, the following effects can be obtained: The configuration of the stopper 200 is simplified. The stopper 200 is easy to handle. The workability of the reattachment work for the object to be grasped W is improved.

[0244] In one example, the pressing portion 400 is a nut.

[0245] According to the above-mentioned configuration, for example, the following effects can be obtained: The pressing portion 400 can be easily operated.

[0246] In one example, the outer diameter of the support shaft 232 is smaller than the inner diameter of the gripping portion 40 of the collet chuck 20 .

[0247] According to the above-mentioned configuration, for example, the following effects can be obtained: The support shaft 232 can be easily disposed in the gripping portion 40 of the collet chuck 20.

[0248] In one example, the support portion 230 includes a surface treatment portion 240 .

[0249] According to the above-mentioned configuration, for example, the following effects can be obtained: The support portion 230 is less susceptible to wear.

[0250] In one example, the stopper 200 includes a peripheral support 500 .

[0251] According to the above-mentioned configuration, for example, the following effects can be obtained: The sleeve 300 is less likely to rattle.

[0252] (Effect 3) The following effects can be given as examples of effects obtained by the embodiment.

[0253] In one example, the stopper 200 includes a first stopper member P1 and a second stopper member P2 that can be joined or separated.

[0254] According to the above-mentioned configuration, for example, the following effects can be obtained: The second stopper forming body P2 can be replaced in accordance with the shape of the object to be grasped W, etc.

[0255] In one example, the second stopper structure P2 is made of a material that is easy to process.

[0256] According to the above-described configuration, for example, the following effects can be obtained. The workability is improved when additional machining is performed on the second stopper constituent body P2. When the first additional machining is performed on the second stopper constituent body P2, the accuracy of supporting the grasped object W by the supporting portion 230 is improved.

[0257] In one example, the sleeve 300 includes a sloped portion 322 .

[0258] According to the above configuration, for example, the following effects can be obtained: When sleeve 300 is in the expanded state, outer circumferential surface 300F of inclined portion 322 and inner circumferential surface 20G of collet chuck 20 are parallel or nearly parallel.

[0259] This increases the area of ​​contact between the outer circumferential surface 300F of the inclined portion 322 and the inner circumferential surface 20G of the collet chuck 20. This reduces the likelihood of the sleeve 300 rattling.

[0260] When the workpiece W to be grasped is machined by a lathe, the load on the workpiece W may be higher than when the workpiece W to be grasped is machined by, for example, a cylindrical grinding machine.

[0261] According to the stopper 200, the contact area between the outer circumferential surface 300F of the inclined portion 322 and the inner circumferential surface 20G of the collet chuck 20 is increased, so that the sleeve 300 is less likely to rattle even during processing in which the load on the object to be grasped W is high.

[0262] The possible forms of the stopper assembly and the stopper according to the present invention are not limited to the description in each of the above embodiments. The stopper assembly and the stopper according to the present invention may take forms different from those illustrated in each of the embodiments. Examples of such forms include forms in which a part of the configuration of each of the embodiments is replaced, changed, or omitted, or forms in which a new configuration is added to the embodiments. [Explanation of symbols]

[0263] 10: Chuck assembly 20: Collet chuck 200: Stopper 210: Shaft 211: Information Department 220: Large diameter section 230: Support part 231: Support surface 300:Sleeve 400: Pressing section W: object to be grasped

Claims

1. A stopper that is inserted into a sleeve that is coupled to a collet chuck, The stopper includes a shaft portion, a large diameter portion, and a support portion that are integrally formed, the shaft portion includes a guide portion that guides a pressing portion that moves the sleeve relative to the stopper in an axial direction of the stopper, The large diameter portion is configured to expand and deform the sleeve, The support portion is provided on the opposite side of the shaft portion with respect to the large diameter portion in the axial direction of the stopper, and includes a support surface for supporting an object to be grasped. Stopper.

2. The support portion includes a support shaft extending in an axial direction of the stopper, The support shaft includes the support surface. The stopper according to claim 1 .

3. The outer diameter of the support shaft is smaller than the outer diameter of the large diameter portion. The stopper according to claim 2 .

4. The length of the support shaft in the axial direction of the stopper is equal to or greater than the length of the large diameter portion in the axial direction of the stopper. The stopper according to claim 3.

5. The guide portion is configured to include a portion that is positioned outside the collet chuck when the stopper is inserted into the collet chuck. The stopper according to claim 1 .

6. A stopper according to any one of claims 1 to 5; The sleeve; The pressing portion Stopper assembly.

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