WO2020241643A1 - Mount-type centering device and electric tool - Google Patents

Abstract

[Problem] The purpose of the present invention is to provide: a mount-type centering device that is capable of preventing decentering of a rotary fixture during rotation, by centering a base shaft held by a base shaft holder; and an electric driver in which the mount-type centering device is mounted on the base shaft holder. [Solution] The present invention is configured to comprise: a centering bearing 50 that abuts and centers a base shaft 6 of a rotary fixture 5 that passes through a through-hole 40a; a mounting unit 80 in which the centering bearing 50 is mounted on a tip in a holder body 10 that constitutes a base shaft holder 1 for holding the base shaft 6 inserted from an axial tip side Lf; and an assembly ring 81 the position of which is adjusted so as to cause the axial direction L of the centering bearing 50 to coincide with the axial direction L of the holder body 10, wherein the relative position of the assembly ring 81 and a ring magnet 83 in the axial direction L can be adjusted by the assembly ring 81 and an assembly adjustment ring 82.

Description

Mountable centering device and power tools

According to the present invention, for example, a mounting type centering device that is attached to a base shaft holder that inserts and holds a base shaft of a rotating jig such as a driver bit or a drill bit to align the base shaft, and a base shaft holder that is mounted on the base shaft holder. Regarding the electric screwdriver to which is installed.

Conventionally, as a base shaft holder to be placed at the tip of an electric screwdriver or the like, a base shaft holder has been proposed in which the base shaft of a held rotary jig does not come out carelessly (see Patent Document 1).
This base shaft holder has a base shaft insertion hole into which the base shaft of the rotary jig can be detachably inserted and a through hole for movably arranging a steel ball to be locked in a locking groove formed on the outer surface of the base shaft. A steel ball to be placed in the through hole, a tubular outer fitting member slidably fitted to the holder body, and a spring for urging the outer fitting member toward the base end side of the holder body. Has been done.

When the base shaft is inserted into the base shaft insertion hole of the base shaft holder, the outer fitting member causes the steel ball to appear and disappear from the inner peripheral surface of the base shaft insertion hole to lock the base shaft with the locking groove, and the base shaft inserted into the base shaft holder becomes It can be held so that it will not come out carelessly.

However, since the base shaft insertion hole into which such a base shaft can be inserted is formed to be slightly larger than the base shaft, the insertion position and the insertion direction of the base shaft are slightly deviated from the center of rotation during the attachment state and use. Then, so-called run-out, which is called core blurring, sometimes occurred.

Japanese Unexamined Patent Publication No. 2006-19875

Therefore, in the present invention, a mounting type centering device capable of aligning the base shaft held by the base shaft holder to prevent center deviation (runout) during rotation of the rotating jig, and a mounting type centering device attached to the base shaft holder. The purpose is to provide an electric driver.

In the present invention, the centering means is provided at the tip of a holder body constituting a centering means that abuts and aligns the base shaft of a rotating jig that penetrates the through hole and a base shaft holder that holds the base shaft inserted from the tip side. The mounting member to be mounted, the position adjusting portion whose position is adjusted so that the axial direction of the centering means coincides with the axial direction of the holder body, and the relative position of the mounting member and the position adjusting portion in the axial direction. It is a mounting type centering device that is provided with a relative position adjusting means for adjusting the key shaft, is attached to the base shaft holder, and aligns the base shaft held by the base shaft holder.

The rotary jig can be a drill bit that rotates by being attached to a manual tool or an electric tool, a plus or minus driver bit, or the like, and the base shaft of the rotary jig is also called a tool shank.
Further, the basic axis includes various cross-sectional shapes such as a polygonal cross section such as a hexagonal cross section and a circular cross section.

The centering means may be a means that moves in the radial center direction and abuts on the outer surface of the base shaft, or a means that abuts on the outer surface of the base shaft by deformation such as extending in the radial center direction. Further, it may be a plurality of centering means for abutting and centering the base shaft at a plurality of points, and for example, an elastic ring that is externally fitted so as to urge the outer peripheral surface of the base shaft in the radial direction. It may be composed of one part.

The position adjusting portion abuts on a part of the inner diameter side or the outer diameter side near the tip of the holder body, and the position is adjusted so that the axial direction of the centering means coincides with the axial direction of the holder body. Is.

According to the present invention, it is possible to reliably align the base shaft held by the base shaft holder and prevent center deviation during rotation of the rotating jig.
More specifically, by attaching the mounting type centering device to the base shaft holder that holds the base shaft, the base shaft held by the base shaft holder can be reliably centered by the centering means, and the rotation jig can be rotated. It is possible to prevent core shake at the time.

Further, depending on the shape of the holder body to be mounted, the position adjusting portion may or may not be positioned with respect to the mounting member. On the other hand, since the relative position adjusting means for adjusting the relative position of the mounting member and the position adjusting portion in the axial direction is provided, the relative position adjusting means adjusts the position of the mounting member with respect to the mounting member. The part can be adjusted to a position where the position can be adjusted reliably. Therefore, the base shaft held by the base shaft holder can be reliably centered by the centering means, and the center deviation during rotation of the rotating jig can be prevented.

As an aspect of the present invention, the mounting member is provided with a first screw portion, and the relative position adjusting means is provided with an operation portion for performing an adjustment operation and a second screw for screwing with the first screw portion. A portion is provided, and the operating portion is operated to screw in and out the first screwed portion and the second screwed portion to adjust the relative position of the mounting member and the position adjusting portion in the axial direction. You may.
INDUSTRIAL APPLICABILITY According to the present invention, the base shaft held by the base shaft holder can be centered with high accuracy by the centering means to prevent the centering deviation during rotation of the rotating jig.

More specifically, by operating the operation unit, the first screwed portion of the mounting member and the second screwed portion of the relative position adjusting means screwed in and out. By this screwing in and out, the relative position of the mounting member and the position adjusting portion in the axial direction can be accurately adjusted, and the alignment can be performed with high accuracy. Therefore, it is possible to prevent the core shake during rotation of the rotating jig.

Further, as an aspect of the present invention, the position adjusting portion may be adjusted by a tip tapered surface formed at the tip of the base shaft insertion hole in the holder body and having a diameter expanded toward the tip.
The position adjusting portion is a single tapered surface whose position can be adjusted so that the axial direction of the centering means coincides with the axial direction of the holder body by, for example, a tip tapered surface, or a plurality of tapered surfaces separated by a predetermined interval. It may be a member which abuts on the tip tapered surface at a plurality of places.

According to the present invention, the mountable centering device can be easily mounted so that the axial direction coincides with the holder body.
More specifically, by aligning the position adjusting portion provided on the base end side inclined member with the tip tapered surface formed at the tip of the base shaft insertion hole in the holder body, the holder body can be attached in the axial direction. The position is adjusted so that the axial directions of the type centering device match, and the mounting type centering device can be easily mounted so that the axial directions match with respect to the holder body. Therefore, the base shaft can be centered with high accuracy with respect to the base shaft holder.

Further, as an aspect of the present invention, the mounting member may be provided with a magnet that is magnetically attached to the holder body, which is a magnetic metal.
The above-mentioned magnet is provided by means that the mounting member itself may be composed of a magnet, a mode in which only a part of the mounting member is magnetized, or a magnet which is a separate component may be provided. It may be assembled by assembling to a constituent member.

According to the present invention, the mountable centering device can be easily attached to the holder body which is a magnetic metal so as to be removable.
More specifically, for example, at least a part of the mounting member is formed as compared with the case where the mounting member of the mountable centering device is provided with a screwing means such as a screw thread and screwed to and detached from the holder body. The mountable centering device can be easily attached to the holder body by the magnetic force of the magnet, and can be easily removed. That is, the mountable centering device can be easily attached to and detached from the holder body.

Further, as described above, the mounting member of the mountable centering device is provided with a screwing means such as a screw thread so that it can be detachably screwed to the holder body, but is screwed to the holder body of the base shaft holder being used. If there is no fitting means, it is necessary to provide a screwing means in the holder body. On the other hand, since the mounting type centering device can be easily mounted on the holder body by the magnetic force of the magnet provided in the mounting member, if the holder body is a magnetic metal, the base shaft holder used without any processing is used. The mountable centering device can be easily attached and detached.

Further, by magnetically adhering the mounting member to the holder body with a magnet provided on the mounting member, the mountable centering device can be easily attached to the holder body so as to be removable. Further, the magnetic circuit can be formed by the mounting member, the holder body, and the magnet, and the mounting member can be firmly mounted on the holder body as compared with the mounting by simple magnetism.
Further, since the magnetic circuit is composed of the mounting member, the holder body, and the magnet, the handleability can be improved without inadvertently adsorbing the base shaft made of magnetic metal.

Further, as an aspect of the present invention, the position adjusting portion is provided with an arrangement space for arranging the centering means, and the centering means abuts on the base shaft inserted into the through hole from at least three directions. A tangent portion and an urging means for urging the tangent portion toward the base axis may be provided.

The above-mentioned contact from at least three directions on the basic axis is a mode of contacting a plurality of equally spaced three or more directions in the circumferential direction of the circular cross section, a hexagon constituting the basic axis of the hexagonal cross section in the circumferential direction, and the like. A mode of contacting at least 12 or at least 6 points or multiples of these at least 12 or at least 6 points that straddle the corners in six or three directions, or three faces that are evenly spaced in the circumferential direction among the six faces that make up the hexagonal cross section. , It may be in a mode of contacting with six or four surfaces.
It should be noted that the contact points on the base shaft that come into contact with each other from at least three directions may be displaced or coincide with each other in the axial direction.

The urging means is such that the abutting portion is urged toward the center of the base shaft, the two adjacent abutting portions are urged so as to be pulled together, and the adjacent abutting portions are pressed so as to be close to each other. It may be an aspect of urging.
The urging means and the contact portion may be formed separately or integrally.

According to the present invention, since the urging means urges the contact portion that comes into contact with the base shaft inserted into the base shaft insertion hole in the holder body from at least three directions toward the base shaft, the holder body is inserted into the base shaft insertion hole. The basic axis can be reliably aligned.

Further, as an aspect of the present invention, the contact portion is composed of a spherical body, and the urging means has a housing portion for accommodating the spherical body at a predetermined position, and at least the spherical body moved in the circumferential direction. It may be composed of an elastic container having elasticity to restore the original position.
The sphere may be a steel sphere or a sphere made of strong engineering plastic or the like.

According to the present invention, a spherical body housed in a housing portion of an elastic housing body can be brought into contact with a base shaft and centered with high accuracy.
More specifically, in order to accommodate a spherical body having a low sliding resistance with respect to the surface of the basic axis in the accommodating portion of the elastic accommodating body, when the basic axis is inserted into the basic axis insertion hole, it hits the contact portion composed of the spherical body. It can be inserted smoothly even if it is in contact.

Further, since the contact portion composed of the spherical body is accommodated in the accommodating portion of the elastic accommodating body, the spherical body itself can be arranged at an appropriate position. Further, since the accommodating portion for accommodating the sphere is configured as an elastic accommodating body, when the sphere moves due to the insertion of the proximal shaft into the axial insertion hole, the accommodating portion accommodating the sphere also deforms. The spherical body can be urged with respect to the base axis by the restoring force against the deformation of the elastic accommodating body. As described above, the elastic accommodating body having the accommodating portion for accommodating the spherical body functions as a regulating body for regulating the position of the spherical body as the contact portion, and is an urging means for urging the spherical body with respect to the base axis. It is also possible to bring the spherical body housed in the housing part of the elastic housing body into contact with the base shaft and align it with high accuracy.

Further, as an aspect of the present invention, a pressurizing means for pressurizing the elastic accommodating body arranged in the arrangement space may be provided.
According to the present invention, the base shaft inserted into the base shaft insertion hole can be centered with higher accuracy.

More specifically, the internal stress of the elastic accommodating body is obtained by pressurizing the elastic accommodating body that urges the spherical body against the base shaft inserted into the base shaft insertion hole in the holder body and brings them into contact with each other from at least three directions. It is possible to increase the urging force for urging the spherical body with respect to the basic axis, and it is possible to align the basic axis with higher accuracy.

Further, as an aspect of the present invention, a deformation regulating means may be provided which is attached to a part of the outer diameter of the elastic accommodating body to regulate the deformation of the outer diameter of the elastic accommodating body.
According to the present invention, the deformation of the outer diameter of the elastic accommodating body can be suppressed by the pressurization by the pressurizing means, the internal stress of the elastic accommodating body is further increased, and the pressing force by the pressurizing means is adjusted by the spherical body in contact with the base shaft. It can act as an urging force in the direction of centering, and the base axis can be aligned with higher accuracy.

Further, as an aspect of the present invention, the pressurizing means is provided with an insertion hole through which the base shaft can be inserted, and a screw-in / out means for screwing the pressurizing means and the position adjusting portion in and out in the axial direction, and the insertion hole. A pressurizing operation unit may be provided in which the screwing / removing means is operated by using the base shaft inserted into the shaft as a reaction force to move the pressurizing means in the axial direction with respect to the position adjusting unit.
According to the present invention, it is possible to apply a desired pressing force with the base shaft inserted to align the base shaft with higher accuracy.

More specifically, by operating the screw-in / out means in the pressurizing operation unit, the base shaft inserted into the insertion hole is used as a reaction force, that is, the base shaft is inserted into the insertion hole with respect to the base shaft. The pressurizing means in a state where the rotation is restricted can be moved in the axial direction with respect to the position adjusting portion to pressurize the elastic accommodating body by the pressurizing means with a desired pressing force.

Further, as an aspect of the present invention, the contact portion is brought into contact with the outer surface forming the three or all corner portions at equal intervals in the circumferential direction in the hexagonal cross-sectional shape with the corner portion sandwiched between them. It may be arranged.
In the hexagonal cross-sectional shape described above, contacting the outer surface forming the three directions evenly spaced in the circumferential direction or all the corners with the corners sandwiched means that the corners are equally spaced in the circumferential direction. In the case of a part, the contact is made at 6 points near the corners of the outer surface on both sides of the corner or at multiple points thereof, and in the case of all the corners, it is near the corners of the outer surface on both sides of the corner. It will come into contact at at least 12 places.

According to the present invention, the base shaft inserted into the base shaft insertion hole can be centered with high accuracy.
Since the abutting portion contacts the outer surface forming the three or all corner portions equally spaced in the circumferential direction in the hexagonal cross-sectional shape with the corner portion sandwiched, the contact portion abuts in the circumferential direction in the hexagonal cross-sectional shape. Since two or more abutting portions abut against one corner portion in three equally spaced directions or at all corner portions, the urging force of the urging means acting through the abutting portion is described above. It can be aligned with high accuracy toward the axial direction of the basic shaft inserted into the base shaft insertion hole.

When the elastic accommodating body in which the spheres constituting the contact portion are accommodated in the accommodating portion is arranged in the arrangement space, at least two spheres on both sides of one corner portion and the accommodating portion accommodating the spheres are the basic axes. By inserting the base shaft into the insertion hole, the two spheres move in the direction of separation along the inner surface of the cylinder outside the diameter of the sphere, so that the two spheres act as an urging force in the direction in which they approach each other, that is, the corners of the two spheres It acts as an urging force in the direction of sandwiching the shaft, and can align the base shaft inserted into the base shaft insertion hole with higher accuracy.

Further, as an aspect of the present invention, among the abutting portions arranged on both sides with respect to the plurality of corner portions, the abutting portion on one side and the abutting portion on the other side when viewed from the axial direction are in the axial direction. The position may be different.
Of the contact portions arranged on both sides with respect to the plurality of corner portions, the contact portion on one side when viewed from the axial direction and the contact portion on the other side are clockwise when viewed from the axial direction. When the front side is one side, the other side is the clockwise rear side when viewed from the axial direction.

According to the present invention, when at least two spheres on both sides of one corner and the accommodating portion accommodating the spheres move in a direction away from each other by inserting the base into the base insertion hole, the axial direction at one corner. The contact portion on one side of the view and the contact portion on the other side in the axial view at the adjacent corners are close to each other. On the other hand, among the abutting portions arranged on both sides with respect to the plurality of corner portions, the abutting portion on one side and the abutting portion on the other side are different in the axial direction when viewed from the axial direction. As a result, the contact portion on one side in the axial view at one corner and the contact portion on the other side in the axial view at the adjacent corner do not interfere with each other in close proximity. Therefore, it is possible to reliably apply the urging force to align the base shaft inserted into the base shaft insertion hole with high accuracy and reliably.

Further, the present invention is an electric tool provided with a drive device and a rotation transmission means for transmitting the rotational force of the drive device on the axis, and the above-mentioned mounting type centering device is assembled to the base shaft holder. It is characterized by that.

According to the present invention, the base shaft is aligned and the rotating jig can be rotated without misalignment.
The power tool may be any power tool that can rotate the rotary jig such as an electric driver or an impact driver as long as a rotary jig such as a driver bit or a drill bit can be attached.

According to the present invention, a mounting type centering device capable of aligning the base shaft held by the base shaft holder to prevent center deviation during rotation of the rotating jig, and an electric motor in which the mounting type centering device is attached to the base shaft holder. A driver can be provided.

Front view of a power tool with a centering adapter attached to the base shaft holder. A perspective view of the base shaft holder with the centering adapter attached. Perspective view of the base shaft holder before mounting the centering adapter. An exploded explanatory view showing each component of the alignment adapter, the front surface and the back surface of the base shaft holder, and the side surface and the cross section. An exploded perspective view of each component of the alignment adapter from the front side. An exploded perspective view of each component of the alignment adapter from the rear side. Perspective view of the alignment bearing. Vertical cross-sectional view of the base shaft holder to which the alignment adapter is attached. Explanatory drawing about mounting of alignment adapter to base shaft holder. Cross-sectional view of the pivot holder to which the centering adapter is attached. Explanatory drawing about alignment by alignment adapter. Explanatory drawing about realignment by alignment adapter. A perspective view of a centering bearing of another embodiment. Explanatory drawing about the additional alignment by the alignment adapter of another embodiment.

An embodiment of the present invention will be described in detail below with reference to the drawings.
The centering adapter 40, the base shaft holder 1 to which the centering adapter 40 is attached, and the power tool K will be described together with FIGS. 1 to 12.

FIG. 1 shows a front view of the power tool K in which the centering adapter 40 is attached to the base shaft holder 1, FIG. 2 shows a perspective view of the base shaft holder 1 in a state where the centering adapter 40 is attached, and FIG. 3 shows a centering adapter. The perspective view of the base shaft holder 1 before mounting 40 is shown.

Further, FIG. 4 shows an exploded explanatory view showing each component of the centering adapter 40, the front surface and the back surface of the base shaft holder 1, and the side surface and the cross section.
Specifically, in FIG. 4, the base shaft holder 1, the mounting ring 81, the mounting adjustment ring 82, the ring magnet 83, the retainer 52, the base end side retainer cover 54, and the pressure ring 70 show a vertical sectional view and a front view. Further, in FIG. 4, the tip side retainer cover 53 and the tip cap 60 show a vertical sectional view and a rear view, and the alignment ball 51 shows a side view and a front view.

Further, FIG. 5 shows an exploded perspective view of each component of the centering adapter 40 from the front side, FIG. 6 shows an exploded perspective view of each component of the centering adapter 40 from the back side, and FIG. 7 shows an exploded perspective view of each component of the centering adapter 40. The explanatory view by the perspective view of the core bearing 50 is shown. Specifically, FIG. 7A is a perspective view of the centering bearing 50 with a part of the front side in the circumferential direction cut out. FIG. 7B is a perspective view in which a part of the front side in the circumferential direction is cut out in a state where the front end side retainer cover 53 and the base end side retainer cover 54 are separated from the retainer 52 to which the alignment ball 51 is assembled. ..

FIG. 8 shows a vertical cross-sectional view of the base shaft holder 1 to which the centering adapter 40 is attached, and FIG. 9 shows an explanatory view of mounting of the centering adapter 40 to the base shaft holder 1. Specifically, FIG. 9A shows a vertical cross-sectional view of the state before the alignment adapter 40 is attached to the base shaft holder 1. FIG. 9B shows an enlarged view of part a in FIG. 8 in a state where the centering adapter 40 is attached to the base shaft holder 1. FIG. 9C shows an enlarged view of part a in FIG. 8 in a state where the centering adapter 40 is attached in a state where the ring magnet 83 is not magnetized. FIG. 9D shows an enlarged view of part a in FIG. 8 in a mounted state of the alignment adapter 40 in a state where the position adjusting tapered surface 814 is not in contact with the alignment inclined surface 191.

FIG. 10 shows an explanatory view of the base shaft holder 1 to which the centering adapter 40 is attached. Specifically, FIG. 10A shows an arrow view of aa in FIG. 10D, which shows a side view of the base shaft holder 1 to which the centering adapter 40 is attached. Further, FIG. 10 (b) shows a view taken along the line bb in FIG. 10 (d), and FIG. 10 (c) shows a view taken along the line cc in FIG. 10 (d).

FIG. 11 shows an explanatory diagram of the alignment by the alignment adapter 40, and in detail, FIG. 11A shows a- in FIG. 10D in the alignment state by the alignment adapter 40 mounted on the base shaft holder 1. The arrow view is shown, and FIG. 11 (b) shows the bb arrow view of FIG. 10 (d) in the same state.

FIG. 12 shows an explanatory diagram of the alignment center by the alignment adapter 40. Specifically, FIG. 12A shows a vertical cross-sectional view of the base shaft holder 1 to which the centering adapter 40 with the base shaft 6 inserted is attached. FIG. 12 (b) shows an enlarged view of part b in FIG. 12 (a). FIG. 12C shows an enlarged view of part b in a state of being realigned by the tip cap 60.

The centering adapter 40 of the present invention is attached to the base shaft holder 1 provided at the tip of the power tool K, and aligns the rotary jig 5 held by the base shaft holder 1. For example, the power tool K includes a housing 2 provided with a handle portion 2a gripped by a user during use, a motor M capable of forward / reverse rotation arranged inside the housing 2, and a rotation transmission mechanism (not shown). ing.

Then, the base shaft holder 1 is arranged in front of the housing 2 and holds the base shaft 6 of the rotary jig 5. By operating the trigger 2b arranged on the handle portion 2a, the rotational driving force of the motor M that can rotate in the forward and reverse directions installed inside the housing is transmitted by the rotation transmission mechanism, and the base shaft holder 1 rotates. is there.

Before explaining the base shaft holder 1, the rotary jig 5 held by the base shaft holder 1 will be described. As shown in FIGS. 2, 5 and 6, the base shaft 6 of the axially tip side Lf of the rotating jig 5 such as a driver bit or a drill bit has a hexagonal cross section and is an arcuate groove in the vertical cross section. The groove 7 is formed in the circumferential direction. Further, the base end inclined portion 8 of the base end side Lb in the axial direction of the base shaft 6 projects toward the rear end side in a tapered substantially conical shape.

The planar outer surface formed on the base shaft 6 in a hexagonal cross section is an outer plane 6a, and the space between the outer planes 6a is a corner portion 6b. Further, the end portion of the axially proximal end side Lb of the proximal end inclined portion 8 is defined as the top portion 8a. Further, the locking groove 7 is formed in a circular arc shape having a diameter slightly larger than the diameter of the retaining ball 21, which will be described later.

As shown in FIG. 4, the base shaft holder 1 mounted on the power tool K described above includes the holder body 10, the retaining ball 21, the sleeve 30, the sleeve spring 22, the fixing ring 23, and the grip ring 24, which are the main parts. It is assembled and configured.

The base shaft holder 1 is a generally used base shaft holder, and if the alignment inclined surface 191 and the tip surface 192 are formed on the tip surface of the small diameter front body portion 12 of the holder body 10, the above will be described. It is not limited to the configuration.

Further, in the present embodiment, the alignment inclined surface 191 is described based on the function so that the axial direction L of the alignment adapter 40 and the axial direction L of the base shaft holder 1 are matched as described later. , An inclined surface for guiding the insertion of the base shaft 6 into the base shaft insertion hole 11.

In FIG. 3, the holder body 10 side in the axial direction L passing through the center of the elements constituting the basic shaft holder 1 is the axial base end side Lb, and the side on which the alignment inclined surface 191 is formed is the axial tip side. It is Lf.

The holder body 10 has a substantially cylindrical shape in which a base shaft insertion hole 11 in the axial direction L from the axial tip side Lf to the axial base end side Lb is formed inside, and has a small-diameter front body portion 12 and a large-diameter rear body. It is composed of a part 13.

The small-diameter front body portion 12 is arranged at the axial tip side Lf of the holder body 10. The large-diameter rear body portion 13 is arranged on the axially proximal end side Lb from the small-diameter front body portion 12, and a flange 14 extending in two directions toward the outer diameter is provided on the axial proximal end side Lb.

The axial insertion hole 11 in the axial direction L from the axial tip side Lf to the axial proximal end side Lb of the holder body 10 is a space having a hexagonal left side view axis extending in the axial direction L. A taper space 111 whose diameter is tapered toward the axial base end side Lb is provided at the base end portion (right end portion in FIG. 4) of the base shaft insertion hole 11.

Further, in the axially proximal end side Lb of the small-diameter front body portion 12, the outside of the holder body 10 and the proximal shaft insertion hole 11 described later are communicated in the radial direction, and a retaining ball 21 described later is accommodated in the retaining hole. 17 are provided at two places at equal intervals in the circumferential direction.

The retaining hole 17 is a radial through hole that accommodates the retaining ball 21, which will be described later, so as to be movable in the radial direction, and communicates the outer diameter of the holder body 10 with the base shaft insertion hole 11, and faces each other in the circumferential direction. Although it was provided at two places, for example, three places may be provided at equal intervals in the circumferential direction. The holder body 10 is made of magnetic metal.

The retaining hole 17 is formed to have a diameter slightly larger than that of the retaining ball 21 to be accommodated, so that the retaining ball 21 accommodated does not fall into the pivot insertion hole 11 inside the diameter of the retaining hole 17. Is provided with a stopper (not shown). Further, the retaining hole 17 is formed with a groove depth shorter than the diameter of the retaining ball 21 to be accommodated, and the inside diameter of the retaining ball 21 to be accommodated is exposed to the pivot insertion hole 11.

Further, an engaging groove 18 in the circumferential direction in which the grip ring 24 described later is engaged is formed on the outer peripheral surface of the holder body 10 near the tip of the small diameter front body portion 12.
Further, on the inner surface of the tip of the small-diameter front body portion 12, a positioning inclined surface 191 that expands in a trumpet shape from the tip side Lf in the axial direction toward the base end side Lb in the axial direction is formed, and outside the diameter, in the axial direction L. The tip surface 192 in the orthogonal direction is formed.

The sleeve 30 has a substantially cylindrical shape that is externally fitted to the small-diameter front body portion 12 of the holder body 10 from the axial tip side Lf. Specifically, in the sleeve 30, the front body portion 30a and the rear body portion 30b having a diameter smaller than that of the front body portion 30a are arranged and integrated in this order from the axial tip side Lf along the axial direction L. Then, a penetrating space penetrating in the axial direction L is formed inside.

The front body portion 30a has an inner diameter slightly larger than the outer diameter of the small diameter front body portion 12.
Further, on the inner surface between the front body portion 30a and the rear body portion 30b, a protrusion restricting portion 32 is provided so as to project radially inward and axially to the tip side Lf in the vertical cross section.

The sleeve spring 22 is a so-called coil spring that is urged in the axial direction L, and is externally fitted to the small-diameter front body portion 12 of the holder body 10 and is between the sleeve spring 22 and the inner surface of the front body portion 30a constituting the sleeve 30 in the mounted state. It is formed with a diameter arranged in.

The fixing ring 23 is a plate-shaped ring body that is externally fitted to the small diameter front body portion 12. The grip ring 24 is a spring ring that is formed of a linear spring with a partially open circular shape and that fits outside into an engaging groove 18 provided on the outer peripheral surface of the small-diameter front body portion 12. The grip ring 24 has a diameter cross section longer than the depth of the engaging groove 18 to be fitted. In the assembled state, the fixing ring 23 is configured to close the axial tip side Lf of the accommodation space of the sleeve 30.

In the base shaft holder 1 in which each element is configured in this way, the sleeve 30 is externally fitted to the small-diameter front body portion 12 in a state of being housed in the retaining ball 21 in the retaining hole 17, and the sleeve is fitted from the axial tip side Lf thereof. Insert the spring 22. At this time, the sleeve spring 22 is arranged between the small diameter front body portion 12 and the sleeve 30. Then, the fixing ring 23 is further mounted from the front, and the grip ring 24 is engaged with the engaging groove 18.

As described above, by engaging the grip ring 24 with the engaging groove 18, the movement of the axially tip side Lf of the fixing ring 23 that is externally fitted to the small diameter front body portion 12 is restricted, and the fixing ring 23 is a sleeve spring. It is a reaction force of Lf on the tip side in the axial direction of 22. Therefore, the sleeve 30 is assembled in a state of being urged to the axial base end side Lb by the sleeve spring 22 using the fixing ring 23 as a reaction force.

In the base shaft holder 1 in which each element is assembled in this way, the protrusion restricting portion 32 of the sleeve 30 is arranged outside the diameter of the retaining ball 21 housed in the retaining hole 17, so that the diameter of the retaining ball 21 is External movement can be regulated. Therefore, in order to insert the base shaft 6 of the rotary jig 5 into the base shaft insertion hole 11 and hold the base shaft 6 with the base shaft holder 1, the base shaft 6 is inserted into the base shaft insertion hole 11 from the axial tip side Lf, but the base shaft 6 is inserted. The retaining ball 21 exposed to the insertion hole 11 comes into contact with the base end inclined portion 8 and cannot be inserted.

Here, once the sleeve 30 is moved to the axial tip side Lf against the urging force of the sleeve spring 22, the protrusion restricting portion 32 located outside the diameter of the retaining ball 21 is also axially tip side Lf. It becomes possible to move the retaining ball 21 to the outside of the diameter by the protrusion restricting portion 32.

In this state, when the base shaft 6 is further moved to the base end side Lb in the axial direction, the base end inclined portion 8 of the base shaft 6 can move the retaining ball 21 outward in diameter and insert it. Here, when the force for moving the axial tip side Lf of the sleeve 30 is eliminated, the sleeve 30 tries to move to the axial base end side Lb due to the urging force of the sleeve spring 22, but the retaining ball 21 is attached to the base shaft 6. Since it slides on the outer plane 6a, the sleeve 30 cannot move to the axial base end side Lb.

Further, when the base shaft 6 is moved to the axial base end side Lb and the locking groove 7 is at the position corresponding to the retaining ball 21, the retaining ball 21 moves inward in diameter and the retaining ball 21 is locked in the locking groove. Fit into 7. As the retaining ball 21 moves inward in diameter, the sleeve 30 moves to the axially proximal side Lb due to the urging force of the sleeve spring 22, and the protrusion restricting portion 32 restricts the movement of the retaining ball 21 outside the diameter. Will be done. Therefore, as shown in FIG. 8, the base shaft 6 in which the retaining ball 21 is locked in the locking groove 7 can be prevented from coming out of the base shaft holder 1.

Further, in the holding state of the base shaft 6 by the base shaft holder 1 in which the retaining ball 21 is locked in the locking groove 7, the base end inclined portion 8 of the base end side Lb of the base shaft 6 in the axial direction is the base shaft insertion hole 11. It is in contact with the tapered space 111 of.

Specifically, the proximal end inclined portion 8 projecting to the axial proximal end side Lb abuts on the peripheral wall of the tapered space 111, which is a tapered space tapered to the axial proximal end side Lb, whereby the axial holder It is possible to align the base end inclined portion 8 which is the end portion of the axial direction base end side Lb of the base shaft 6 with respect to the central axis of the axial direction L of 1.

By using the rotary jig 5, when the force of the axial proximal end side Lb acts on the rotary jig 5 (base shaft 6), the proximal end inclined portion 8 is pressed against the tapered space 111, so that the rotary jig 5 is pressed. The axial base end side Lb of 5 can be more centered with respect to the base holder 1.

The base shaft insertion hole 11 is formed slightly larger than the base shaft 6 so that the base shaft 6 can be inserted. Therefore, although the base end inclined portion 8 is centered by the taper space 111, there is a possibility that the insertion position and the insertion direction of the base shaft 6 may be slightly deviated from the center of rotation in the attachment state or in use. When the insertion position and the insertion direction of the base shaft 6 are slightly deviated from the center of rotation in this way, a so-called runout, which is called runout, may occur.

The centering adapter 40 attached to the tip of the base shaft holder 1 and centered so that the base shaft 6 held by the base shaft holder 1 which may cause the center shake does not move will be described below.
The alignment adapter 40 is configured by assembling a tip cap 60, a pressure ring 70, a alignment bearing 50, and a mounting unit 80.

The alignment bearing 50 constituting the alignment adapter 40 includes a plurality of alignment balls 51, a retainer 52 that accommodates the alignment balls 51 and holds a position in the circumferential direction, an axial tip side Lf, and an axial base. It is composed of retainer covers 53 and 54 that cover the retainer 52 from the end side Lb.

The alignment ball 51 constituting the centering bearing 50 is a steel ball that abuts on both outer planes 6a straddling the corner portion 6b of the base shaft 6. In the present embodiment in which the base shaft 6 has a hexagonal cross section, the alignment ball 51 is in the circumferential direction. Eighteen alignment balls 51 are provided in order to arrange six in three rows.

The retainer 52 that accommodates a plurality of alignment balls 51 and holds their respective positions is composed of a substantially cylindrical main body portion in a sleeping position, and has an axial penetration space 521 that penetrates in the axial direction L. There is.
The tubular main body forms accommodating portions 522 arranged at equal intervals in the circumferential direction at the center of the axial direction L in the cross section, and is inclined with respect to the axial direction L on both sides of the accommodating portion 522 in the axial direction L. A first inclined surface 523 and a second inclined surface 524 are formed.

Specifically, one cross section of the retainer 52 has a first inclined surface 523 that inclines inward toward the axial tip side Lf and a second inclined surface 524 that inclines inward toward the axial base end side Lb. As a result, the width of both legs is narrowed to the outside of the diameter. Further, between the first inclined surface 523 and the second inclined surface 524, three rows of accommodating portions 522 arranged at equal intervals in the circumferential direction are provided in the axial direction L at predetermined intervals. Six accommodating portions 522 are provided in each row at intervals of 60 degrees in the circumferential direction in accordance with the base axis 6 of the hexagonal cross section.

Further, among the three rows of accommodating portions 522, six accommodating portions 522a and 522c are provided at the axial tip side Lf and the axial base end side Lb, respectively, and the positions in the circumferential direction are the same. Further, of the three rows of accommodating portions 522, the six accommodating portions 522b in the center of the axial direction L are displaced in the circumferential direction from the accommodating portions 522a and 522c of the axial tip side Lf and the axial base end side Lb. Specifically, the accommodating portion 522b is arranged at a position deviated in the circumferential direction with respect to the accommodating portions 522a and 522c so as to straddle the corner portion on the base axis 6 of the hexagonal cross section.

The tip-side retainer cover 53 that covers the retainer 52 from the axial tip-side Lf is inclined inward in diameter toward the axial tip-side Lf along the first inclined surface 523, and has a ring-shaped portion extending to the axial base-end side Lb. ing. The distal end side retainer cover 53 is a ring-shaped metal cover that covers the outer diameter of the accommodating portion 522a and covers the axially distal end side Lf from the accommodating portion 522b of the retainer 52.

The base end side retainer cover 54 that covers the retainer 52 from the axial base end side Lb is a ring-shaped portion that is inclined inward in diameter along the second inclined surface 524 toward the axial base end side Lb and extends to the axial tip side Lf. It has. The base end side retainer cover 54 is a ring-shaped metal cover that covers the outer diameter of the accommodating portion 522c and covers the axially proximal end side Lb from the accommodating portion 522b in the retainer 52.

As described above, the distal end side retainer cover 53 and the proximal end side retainer cover 54 have the same shape and are arranged symmetrically with respect to the direction orthogonal to the axial direction L. When the retainer covers 53 and 54 are assembled to the retainer 52, a slight distance in the axial direction L is opened between the ring-shaped portion of the distal end side retainer cover 53 and the ring-shaped portion of the proximal end side retainer cover 54.

Inside the substantially cylindrical tubular main body of the retainer 52, the axial through space 521 penetrating in the axial direction L is formed in a hexagonal shape when viewed from the front, and constitutes a part of the through hole 40a described later. Will be done.

The accommodating portion 522 is a columnar through hole penetrating the tubular main body portion in the radial direction, and is formed with a diameter corresponding to the diameter of the alignment ball 51 accommodating, and the alignment ball 51 accommodating inside the diameter falls off. A stopper (not shown) is provided to prevent the problem.

The retainer 52 configured in this way is made of rubber, for example, which can be deformed together with the accommodating portion 522 by the action of an external force on the alignment ball 51 accommodated in the accommodating portion 522.
The pressurizing ring 70 is a substantially ring having a front view hexagonal through hole 71 penetrating in the axial direction L, which is attached to the axial tip side Lf of the tip side retainer cover 53 of the centering bearing 50 in the centering adapter 40. It is a shape.

Specifically, the pressure ring 70 includes a main body cylinder portion 72 that constitutes a ring-shaped main body. A screw thread 73 that is screwed with a screw groove 815 on the tip end side of the mounting ring 81, which will be described later, is formed on the outer diameter of the axial base end side Lb of the main body cylinder portion 72. Further, an in-diameter convex portion 74 is formed so as to project inward to about half of the axial direction L at the axial tip side Lf of the main body tubular portion 72.

The in-diameter convex portion 74 is formed with a guide tapered surface 75 that expands in a trumpet shape toward the tip side Lf in the axial direction. Further, on the axial proximal end side Lb of the pressure ring 70, a tapered proximal end side tapered surface 76 having a diameter larger than that of the guide tapered surface 75 and expanding in a trumpet shape toward the axial proximal end side Lb is formed. ing.
Further, the base end side tapered surface 76 is formed in an inclined shape along the tip side retainer cover 53 of the above-mentioned alignment bearing 50.

As shown in FIGS. 4 to 8, the tip cap 60 is a tubular body that is externally fitted to the tubular main body 811 of the mounting ring 81 of the mounting unit 80, which will be described later, and is integrated with the mounting ring 81. The tip cap 60 is a bottomed tubular body having a sleeping position in a cross section having an opening 62a communicating with an internal penetrating space 61 penetrating in the axial direction L at the tip of the axial tip side Lf.

The opening 62a is formed by the inner diameter regulating convex portion 62 protruding inward in diameter. Further, a retaining ring (not shown) is fitted to the axial base end side Lb of the tip cap 60 in a state of being assembled with the mounting adjustment ring 82 which is externally fitted to the tip side tubular portion 821 of the mounting adjustment ring 82. An extraction prevention groove 63 is provided to prevent extraction in the axial direction L.

The mounting unit 80 for mounting the centering adapter 40 to the tip of the small-diameter front body portion 12 of the base shaft holder 1 is a ring magnet 83 formed in a ring shape from the axial base end side Lb and a substantially cylindrical mounting adjustment. It is composed of a ring 82 and a mounting ring 81.

The mounting adjustment ring 82 has a configuration in which the ring magnet 83 is mounted inside the diameter of the axially proximal end side Lb and is externally fitted to the mounting ring 81 described later. The mounting ring 81 is configured to accommodate the centering bearing 50 inside.

The ring magnet 83 is a ring-shaped magnet having a substantially square cross section in which magnetic poles are generated on both sides in the axial direction L, and has a contact plane 831 facing the tip surface 192 of the small-diameter front body portion 12.
The mounting adjustment ring 82 has a ring shape that is externally fitted to the axial base end side Lb of the mounting ring 81, and is a shaft in a state of being assembled with the mounting ring 81 on the outer peripheral surface of the tip side tubular portion 821 of the axial tip side Lf. A pull-out prevention groove 822 is provided to which a pull-out prevention ring (not shown) for preventing slip-out in the direction L is fitted.

Further, a position adjusting screw groove 823 that is screwed with the position adjusting screw thread 816 of the mounting ring 81 is formed on the inner surface of the tip side tubular portion 821 of the mounting adjusting ring 82. An in-diameter projecting portion 824 is provided on the axially proximal end side Lb of the position adjusting screw groove 823 so that the axially tip end side Lf is inclined and projects inward in diameter. Further, a magnet fitting groove 825 into which the ring magnet 83 is fitted is formed on the axially proximal end side Lb of the in-diameter protrusion 824.
The mounting adjustment ring 82 is made of magnetic metal.

The mounting ring 81 is composed of a tubular main body 811 which is a substantially tubular body having a centering bearing 50 inside and a penetrating accommodation space 812 penetrating in the axial direction L in the center of the front view. A diameter-reduced tapered portion 813 is formed in which the diameter of the tubular main body portion 811 is gradually reduced toward the axial base end side Lb in the penetration accommodation space 812.

Further, a position adjusting tapered surface 814 is formed on the axially proximal end side Lb of the reduced diameter tapered portion 813 in the mounting ring 81. The position-adjusting tapered surface 814 has a peripheral portion of the penetration accommodation space 812 protruding toward the axially proximal end side Lb, and its outer diameter is tapered. The position adjusting tapered surface 814 can adjust the axial direction L of the alignment adapter 40 with respect to the axial direction L of the basic shaft holder 1 by the alignment inclined surface 191 of the basic shaft holder 1.

The position adjusting tapered surface 814 faces the alignment inclined surface 191 formed on the inner surface side of the tip of the small diameter front body portion 12 in the mounted state on the base shaft holder 1. The position adjustment tapered surface 814 is a tapered convex portion for adjusting the position in the direction in which the axial direction L is aligned by the alignment inclined surface 191, and is composed of a tapered surface having substantially the same inclination angle as the alignment inclined surface 191. ing.

Further, a tip side screw groove 815 is formed on the inner surface of the axial tip side Lf of the tubular main body 811, and a position adjusting screw thread 816 is formed on the outer surface of the axial base end side Lb of the tubular main body 811. It is formed.

The tip side screw groove 815 is screwed with the screw screw 73 formed in the outer diameter of the axial base end side Lb of the main body cylinder portion 72 in the pressure ring 70. The position adjusting screw thread 816 is screwed with the position adjusting screw groove 823 formed on the inner surface of the tip side tubular portion 821 of the mounting adjustment ring 82.

The alignment adapter 40 having each element configured in this way is assembled as described in detail below.
Specifically, first, the alignment ball 51 is accommodated in the accommodating portion 522 provided in the retainer 52. The alignment ball 51 is covered with the tip side retainer cover 53 from the axial tip side Lf of the retainer 52 housed in the accommodating portion 522, and the base end side retainer cover 54 is covered with the axial base end side Lb to assemble the alignment bearing 50.

Further, the mounting unit 80 is assembled by the mounting ring 81, the mounting adjustment ring 82, and the ring magnet 83.
Specifically, the ring magnet 83 is mounted in the magnet fitting groove 825 of the mounting adjustment ring 82, and the mounting adjustment ring 82 is mounted so as to be externally fitted from the axial base end side Lb of the mounting ring 81. At this time, the position adjusting screw groove 823 of the mounting adjustment ring 82 and the position adjusting screw thread 816 of the mounting ring 81 are screwed together.

The mounting unit 80 assembled in this way adjusts the screwing amount by screwing in and out the position adjusting screw groove 823 of the mounting adjusting ring 82 and the position adjusting screw thread 816 of the mounting ring 81. Thereby, the distance between the position adjusting tapered surface 814 of the mounting ring 81 and the contact plane 831 of the ring magnet 83 mounted in the magnet fitting groove 825 of the mounting adjusting ring 82 can be adjusted in the axial direction.

The alignment bearing 50 assembled from the axial tip side Lf is inserted into the penetration accommodation space 812 of the mounting ring 81 in the mounting unit 80 assembled as described above, and further from the axial tip side Lf. The pressure ring 70 is inserted. At this time, the screw 73 of the pressure ring 70 is screwed with the tip side screw groove 815 formed on the inner surface of the mounting ring 81.

In the centering bearing 50 and the pressure ring 70 assembled to the mounting unit 80 in this way, the inclined portion of the retainer cover 54 on the base end side of the centering bearing 50 is the inner surface of the reduced diameter tapered portion 813 of the mounting ring 81. The inclined surface faces the axially proximal end side Lb. Further, the inclined portion of the retainer cover 53 on the distal end side of the centering bearing 50 faces the tapered surface 76 on the proximal end side of the pressure ring 70 at the distal end side Lf in the axial direction.

Further, the tip cap 60 is fitted outward from the axial tip side Lf of the pressure ring 70 so as to straddle the pull-out prevention groove 63 of the tip cap 60 and the pull-out prevention groove 822 of the mounting adjustment ring 82 in the radial direction. The assembly of the centering adapter 40 is completed by attaching the retaining ring (not shown).

In the centering adapter 40 assembled in this way, the tip cap 60 is rotatable with respect to the mounting adjustment ring 82 and the pressure ring 70, but is rotationally fixed to the mounting ring 81.

Further, the centering adapter 40 assembled in this way can be attached to the tip of the base shaft holder 1 as described later.
Specifically, when the alignment adapter 40 is attached to the tip of the base shaft holder 1, as shown in FIG. 9B, the contact plane 831 of the axial base end side Lb of the ring magnet 83 has a small diameter front body portion. The alignment adapter 40 can be magnetically attached to the tip side of the small-diameter front body portion 12 by making surface contact with the tip surface 192 of the tip of the tip 12.

At this time, in the mounting ring 81 constituting the mounting unit 80 of the centering adapter 40, a tapered position adjusting tapered surface 814 protruding toward the axial base end side Lb is formed on the inner circumference of the tip of the small diameter front body portion 12. It is attached according to the alignment inclined surface 191 that spreads like a trumpet toward the tip side Lf in the axial direction.

When the position adjusting taper surface 814 is aligned with the alignment inclined surface 191 in this way, the axial direction L of the centering adapter 40 is aligned with the axial direction L of the base shaft holder 1 with respect to the base shaft holder 1. The position of the centering adapter 40 can be adjusted.

As shown in FIG. 9C, the positioning tapered surface 814 of the mounting ring 81 and the positioning inclined surface 191 of the small diameter front body portion 12 can be aligned. However, depending on the shape and dimensions of the tip side of the small diameter front body portion 12, the tip surface 192 and the contact plane 831 of the ring magnet 83 are separated from each other, and the centering adapter 40 is magnetically attached to the tip of the small diameter front body portion 12. It may not be possible.

As described above, when the tip surface 192 and the contact plane 831 of the ring magnet 83 are separated from each other and the centering adapter 40 cannot be magnetically attached to the tip of the small diameter front body portion 12, it is rotationally fixed to the mounting ring 81. The tip cap 60 is rotated. By rotating the tip cap 60, the amount of screwing between the position adjusting screw thread 816 of the mounting ring 81 and the position adjusting screw groove 823 of the mounting adjusting ring 82 is adjusted. When the screwing amount is adjusted, the position adjusting tapered surface 814 moves to the axial tip side Lf with respect to the ring magnet 83. When the position adjusting taper surface 814 of the mounting ring 81 moves to the tip side Lf in the axial direction, the position adjustment taper surface 814 and the alignment inclined surface 191 of the small diameter front body portion 12 are aligned. Then, the contact plane 831 of the ring magnet 83 can be brought into surface contact with the tip surface 192 of the small diameter front body portion 12, and the centering adapter 40 can be magnetically attached to the tip side of the small diameter front body portion 12.

As shown in FIG. 9D, the tip surface 192 and the contact plane 831 of the ring magnet 83 face each other, and the centering adapter 40 can be magnetically attached to the tip of the small diameter front body portion 12. However, conversely, depending on the shape and dimensions of the tip side of the small diameter front body portion 12, the position adjusting tapered surface 814 of the mounting ring 81 and the alignment inclined surface 191 of the small diameter front body portion 12 may be separated from each other, and the base shaft holder 1 may be separated. It may not be possible to match the axial direction of the centering adapter 40 with respect to the axial direction L.

As described above, when the position adjusting tapered surface 814 and the alignment inclined surface 191 are separated from each other and the axial direction of the alignment adapter 40 cannot be matched with the axial direction L of the base shaft holder 1, the mounting is performed. The tip cap 60 fixed to the ring 81 is rotated. By rotating the tip cap 60, the amount of screwing between the position adjusting screw thread 816 of the mounting ring 81 and the position adjusting screw groove 823 of the mounting adjusting ring 82 is adjusted. When the screwing amount is adjusted, the position adjusting tapered surface 814 is moved to the axial base end side Lb with respect to the ring magnet 83. When the position adjusting tapered surface 814 moves to the axial base end side Lb, the contact plane 831 of the ring magnet 83 is brought into surface contact with the tip surface 192 of the small diameter front body portion 12, and the centering adapter 40 is brought into surface contact with the small diameter front body portion 12. Magnetize on the tip side of. Then, the position adjusting taper surface 814 of the mounting ring 81 and the alignment inclined surface 191 of the small diameter front body portion 12 are aligned, and the axial direction of the centering adapter 40 is aligned with the axial direction L of the base shaft holder 1. Can be done.

In this way, the centering adapter 40 aligns the position adjusting tapered surface 814 of the mounting ring 81 and the positioning inclined surface 191 of the small diameter front body portion 12 with respect to the axial direction L of the base shaft holder 1. Align the axial directions of 40. Further, in the centering adapter 40, the contact plane 831 of the ring magnet 83 is brought into surface contact with the tip surface 192 of the small diameter front body portion 12, and the centering adapter 40 is securely magnetized to the tip side of the small diameter front body portion 12. can do.

As shown in FIG. 8, the through hole 40a of the alignment adapter 40 attached to the tip of the axially tip side Lf of the holder body 10 and the base shaft insertion hole 11 of the holder body 10 communicate with each other. Will be done.

Subsequently, attachment / detachment of the rotating jig 5 (base shaft 6) to the base shaft holder 1, alignment of the base shaft 6 and prevention of the rotating jig 5 (base shaft 6) from coming off from the base shaft insertion hole 11 will be described with reference to FIGS. 10 and 11. ..
As shown in FIG. 8, when the base shaft 6 is inserted into the base shaft holder 1 from the axial tip side Lf, the diameter of the alignment ball 51 housed in the base end inclined portion 8 of the base shaft 6 in the accommodating portion 522 of the alignment bearing 50. Abut on the inside.

Then, when the base shaft 6 is further inserted, a force in the direction of being pushed out of the diameter acts on the alignment ball 51 by the base end inclined portion 8 of the base shaft 6. At this time, since the outer diameter of the alignment ball 51 is regulated by the tip end side retainer cover 53 and the proximal end side retainer cover 54, the alignment ball 51 moves in a direction away from the corner portion 6b of the proximal shaft 6 as shown in FIG. ..

More specifically, the distance between the inner surface of the retainer covers 53 and 54 and the base shaft 6 is the narrowest at the corner 6b, and is wider toward the center of the outer plane 6a from the corner 6b. Therefore, when a force in the direction of pushing out the outer diameter acts on the alignment ball 51 whose outer diameter is regulated by the inner surface of the retainer covers 53 and 54, the center side of the outer plane 6a where the distance from the inner surface of the retainer covers 53 and 54 becomes wider. Moves along the inner surface of the retainer covers 53 and 54 toward.

Specifically, as shown in FIG. 11A, the alignment ball 51 housed in the housing portions 522a and 522c provided on the left side of the corner portion in the axial through space 521 is a retainer cover from the initial position indicated by the broken line. It moves further to the left along the inner and outer planes 6a of 53 and 54. Further, as shown in FIG. 11B, the alignment balls 51 housed in the housing section 522b provided on the right side of the corner portion in the axial through space 521 have the retainer covers 53 and 54 from the initial positions shown by the broken lines. It moves further to the right along the inner and outer planes 6a.

At this time, since the retainer 52 that accommodates the alignment ball 51 in the accommodating portion 522 is also elastically deformed, a restoring force that is accommodated in the accommodating portion 522 and abuts on the outer plane 6a acts to return to the original position. To do.

Specifically, as shown by an arrow in the enlarged view of part a in FIG. 11A, the space is accommodated in the accommodating portions 522a and 522c provided on the left side of the corner portion in the axial through space 521, and is accommodated on the outer plane 6a. A restoring force toward the right side acts on the alignment ball 51 that abuts. Further, as shown by an arrow in the enlarged view of the b portion in FIG. 11B, the alignment ball 51 is accommodated in the accommodating portion 522b provided on the right side of the corner portion in the axial through space 521 and abuts on the outer plane 6a. The restoring force toward the left side acts on.

Therefore, the restoring force of the retainer 52 acts on the outer planes 6a on both sides of the corner portion 6b of the base shaft 6 in the direction of being sandwiched from both sides by the alignment balls 51. Since the restoring force of the alignment ball 51 in the direction of sandwiching the corner portion 6b acts evenly on all the corner portions 6b at the six locations, the base shaft 6 can be centered with high accuracy.

As described above, when the base shaft 6 centered by the centering bearing 50 is further inserted, the base end inclined portion 8 comes into contact with the retaining ball 21 which is accommodated in the retaining hole 17 and exposed in the base shaft insertion hole 11. However, the outside diameter of the retaining ball 21 with which the base end inclined portion 8 is in contact is restricted by the protrusion restricting portion 32.

Therefore, the sleeve 30 is moved to the axial tip side Lf against the urging force of the sleeve spring 22 toward the axial base end side Lb. Since the protrusion restricting portion 32 also moves forward with the forward movement of the sleeve 30, the restriction on the outside diameter of the retaining ball 21 by the protrusion restricting portion 32 is eliminated. Therefore, the retaining ball 21 whose outer diameter restriction is removed by the forward movement of the sleeve 30 moves to the outer diameter, and the base shaft 6 can be further inserted.

Then, when the base shaft 6 is inserted to the position where the locking groove 7 corresponds to the retaining hole 17, the retaining ball 21 moves toward the center of the diameter so as to engage with the locking groove 7, and the base shaft from the base shaft insertion hole 11 is inserted. It is possible to prevent the careless escape of No. 6. At this time, the top 8a of the base end inclined portion 8 on the base shaft 6 is accommodated in the taper space 111 of the base shaft insertion hole 11, and the base end inclined portion 8 which is the base end portion of the base shaft 6 is centered by the taper space 111. be able to.

Here, when the force for moving the sleeve 30 forward is eliminated, as shown in FIG. 12A, the sleeve 30 moves backward by the urging force toward the axial base end side Lb of the sleeve spring 22. Then, the sleeve 30 regulates the outside diameter of the retaining ball 21 engaged with the locking groove 7 by the protrusion restricting portion 32 to prevent the retaining ball 21 from being inadvertently ejected from the locking groove 7. it can.

In such insertion of the base shaft 6 into the base shaft insertion hole 11, the base shaft 6 is centered by the centering bearing 50, and the base end inclined portion 8 which is the base end portion of the base shaft 6 is centered by the tapered space 111. Therefore, the base shaft 6 can be aligned with high accuracy as a whole. Further, the retaining ball 21 that engages with the locking groove 7 can prevent the base shaft 6 from being inadvertently pulled out from the base shaft insertion hole 11.

To remove the base shaft 6 which has been centered and whose careless removal from the base shaft insertion hole 11 is restricted by the retaining ball 21, the sleeve 30 is moved forward. By moving the sleeve 30 forward, the protrusion restricting portion 32 that regulates the outer diameter of the retaining ball 21 that engages with the locking groove 7 is moved forward to eliminate the restriction on the outward movement of the retaining ball 21. Then, the base shaft 6 is moved to the tip side Lf in the axial direction and removed. At this time, due to the outer plane 6a, the retaining ball 21 is located at the non-locking position on the outer diameter of the retaining hole 17.

In this state, when the force for moving the sleeve 30 forward is eliminated, the sleeve 30 moves backward due to the urging force of the sleeve spring 22.
Due to the rearward movement of the sleeve 30, the retaining ball 21 located at the non-locking position on the outer diameter of the retaining hole 17 is moved rearward by the protrusion restricting portion 32 and is inclined toward the lateral proximal end side Lb toward the outer diameter. It is pressed against the inclined side surface 171.

Therefore, the retaining ball 21 is sandwiched from both sides in the axial direction L by the inclined side surface 171 inclined toward the axially proximal end side Lb toward the outer diameter and the protrusion restricting portion 32, and the retaining ball 21 is not outside the diameter. It can be held in the locked position. Therefore, when the base shaft 6 is inserted into the base shaft insertion hole 11 next time, it is possible to save the trouble of temporarily moving the sleeve 30 forward as described above.

When the power tool K is operated and the base shaft holder 1 is rotated in the above-mentioned mounted state of the base shaft 6, when a load acts on the base shaft 6, between the rotating base shaft holder 1 and the base shaft 6 on which the load acts. Slight differential rotation occurs.

At this time, the alignment ball 51 is in contact with the inner surface of the retainer covers 53 and 54 so as to be sandwiched between the outer plane 6a. Therefore, the alignment ball 51 on the rear side in the rotation direction in the differential rotation as described above moves toward the corner portion 6b where the distance between the inner surface and the outer plane 6a of the retainer covers 53 and 54 becomes narrower, and the adjustment of the base shaft 6 is performed by the wedge effect. The state of mind can be made more accurate.

Further, the additional alignment for further improving the alignment accuracy with respect to the base shaft 6 aligned with the alignment bearing 50 will be described below.
As described above, in the mounted state of the base shaft 6, the base shaft 6 is centered with respect to the base shaft holder 1 by the centering bearing 50 of the centering adapter 40, but the tip is further improved in order to further improve the centering accuracy. The cap 60 is rotated with respect to the base shaft 6 in the tightening direction.

More specifically, the base shaft 6 aligned with the base shaft holder 1 is rotation-regulated by the base shaft insertion hole 11 having a hexagonal cross section, and the pressure ring 70 through which the base shaft 6 is inserted through the through hole 71 having a hexagonal cross section. Is in a state where rotation is restricted with respect to the base shaft 6.

In this state, when the tip cap 60 is rotated, it rotates differentially with the pressure ring 70 whose rotation is regulated by the base shaft 6. When the tip side screw groove 815 and the screw thread 73 are screwed together and the tip cap 60 and the pressure ring 70 whose rotation is restricted with respect to the mounting ring 81 rotate differentially, the tip side screw groove 815 and the screw thread are screwed. 73 will be screwed in and out.

Therefore, by rotating the tip cap 60 in the tightening direction with respect to the base shaft 6, the position adjusting screw thread 816 and the screw 73 of the mounting ring 81 whose rotation is restricted to the tip cap 60 are screwed into the base shaft 6 as well. The pressure ring 70 whose rotation is restricted by the above moves to the axial proximal end side Lb.

The base end side tapered surface 76 of the pressure ring 70 that has moved to the axial base end side Lb by the rotation operation of the tip cap 60 in the tightening direction faces the tip side retainer cover 53 in the centering bearing 50. Therefore, the base end side tapered surface 76 presses the tip end side retainer cover 53 toward the axial base end side Lb (see FIG. 12C).

The proximal end side retainer cover 54 in the centering bearing 50 in which the distal end side retainer cover 53 is pressed against the axial proximal end side Lb by the proximal end side tapered surface 76 is regulated by the inner surface of the reduced diameter tapered portion 813 in the mounting ring 81. ing. Therefore, the rubber retainer 52 can be consolidated in the axial direction L between the tip end side retainer cover 53 and the proximal end side retainer cover 54, and the internal stress of the retainer 52 can be increased.

As described above, when the internal stress of the retainer 52 increases, the restoring force of the retainer 52 acting in the direction of sandwiching the outer planes 6a on both sides of the corner portion 6b of the base shaft 6 from both sides by the alignment balls 51 increases, so that the base shaft 6 can be aligned with higher accuracy.

In this way, the centering adapter 40 holds the centering bearing 50 that comes into contact with the base shaft 6 of the rotating jig 5 that penetrates the through hole 40a and aligns the base shaft 6, and the base shaft holder that holds the base shaft 6 inserted from the axial tip side Lf. Position adjustment of the mounting adjustment ring 82 having a ring magnet 83 for attaching the alignment bearing 50 to the tip of the holder body 10 constituting 1 and the axial direction L of the alignment bearing 50 so as to match the axial direction L of the holder body 10. A mounting ring 81 is provided.

Since the centering adapter 40 is configured so that the relative positions of the mounting ring 81 and the ring magnet 83 in the axial direction L can be adjusted by the mounting ring 81 and the mounting adjustment ring 82, the alignment adapter 40 is mounted on the base shaft holder 1. The core adapter 40 can reliably align the base shaft 6 held by the base shaft holder 1 to prevent the center shaft from being shaken during rotation of the rotating jig 5.

More specifically, by attaching the centering adapter 40 to the base shaft holder 1 that holds the base shaft 6, the base shaft 6 held by the base shaft holder 1 can be reliably centered by the centering bearing 50, and the rotary jig 5 can be used. It is possible to prevent core shake during rotation.

Depending on the shape of the holder body 10 to be mounted, the mounting ring 81 may not be positioned or mounted with respect to the ring magnet 83. On the other hand, since the relative position of the mounting ring 81 and the ring magnet 83 in the axial direction L can be adjusted by the mounting ring 81 and the mounting adjustment ring 82, the mounting ring 81 and the mounting adjustment ring 82 can be used with respect to the ring magnet 83. The mounting ring 81 can be reliably adjusted to a position where the position can be adjusted.

Further, the mounting adjustment ring 82 is provided with a position adjusting screw groove 823, and a tip cap 60 that is rotationally fixed to the mounting ring 81 to perform an adjustment operation and a position adjusting screw thread that is screwed into the position adjusting screw groove 823. 816 and are provided. Then, the tip cap 60 is operated to screw in and out the position adjusting screw groove 823 and the position adjusting screw thread 816, and adjust the relative positions of the mounting ring 81 and the ring magnet 83 in the axial direction L. As a result, the base shaft 6 held by the base shaft holder 1 can be centered with high accuracy by the centering bearing 50, and the centering deviation during rotation of the rotating jig 5 can be prevented.

More specifically, by operating the tip cap 60 that is rotationally fixed to the mounting ring 81, the position adjusting screw groove 823 of the mounting adjusting ring 82 and the position adjusting screw thread 816 of the mounting ring 81 to be screwed are screwed in and out. The relative positions of the mounting ring 81 and the ring magnet 83 in the axial direction L can be accurately adjusted to align with high accuracy, and the centering deviation during rotation of the rotating jig 5 can be prevented.

Further, since the position adjusting tapered surface 814 of the mounting ring 81 is formed at the tip of the base shaft insertion hole 11 in the holder body 10 and the position is adjusted by the alignment inclined surface 191 whose diameter is expanded toward the tip, the holder body. The centering adapter 40 can be easily attached so that the axial direction L coincides with that of 10.

More specifically, the holder body is formed by aligning the position adjusting tapered surface 814 of the mounting ring 81 provided on the base end side inclined member with the alignment inclined surface 191 formed at the tip of the base shaft insertion hole 11 in the holder body 10. The position is adjusted so that the axial direction L of the centering adapter 40 coincides with the axial direction L of 10, and the centering adapter 40 can be easily attached so that the axial direction L coincides with the holder body 10. .. Therefore, the base shaft 6 can be aligned with the base shaft holder 1 with high accuracy.

Further, since the mounting adjustment ring 82 is provided with a ring magnet 83 magnetically attached to the holder body 10 made of magnetic metal, the alignment adapter 40 can be easily attached to the holder body 10 made of magnetic metal so as to be detachable. be able to.

More specifically, for example, the magnetic force of the ring magnet 83 provided on the mounting adjustment ring 82 is compared with the case where the centering adapter 40 is provided with a screwing means such as a screw thread and screwed onto the holder body 10 for attachment / detachment. The alignment adapter 40 can be easily attached to the holder body 10 and can be easily removed. That is, the centering adapter 40 can be easily attached to and detached from the holder body 10.

Further, as described above, when the centering adapter is provided with a screwing means such as a screw thread and is configured to be detachably screwed to the holder body, it is screwed to the holder body of the base shaft holder 1 used. Without the means, it is necessary to provide a screwing means on the holder body. On the other hand, since the alignment adapter 40 can be easily attached to the holder body 10 by the magnetic force of the ring magnet 83 provided in the attachment adjustment ring 82, the holder body 10 which is a magnetic metal is used without any processing. The centering adapter 40 can be easily attached to and detached from the base shaft holder 1.

Further, by magnetically attaching the mounting unit 80 to the holder body 10 by the ring magnet 83 provided on the mounting adjustment ring 82, the alignment adapter 40 can be easily attached to and detached from the holder body 10 and the mounting adjustment A magnetic circuit can be composed of a ring 82, a holder body 10 and a ring magnet 83. Therefore, the mounting unit 80 can be firmly mounted on the holder body 10 as compared with the mounting by simple magnetism.
Further, since the magnetic circuit is composed of the mounting unit 80, the holder body 10 and the ring magnet 83, the handleability can be improved without inadvertently adsorbing the base shaft 6 made of magnetic metal.

Further, the mounting ring 81 is provided with a penetration accommodation space 812 for arranging the alignment bearing 50, and the alignment bearing 50 is in contact with the alignment ball 51 in the base shaft 6 inserted into the through hole 40a from at least three directions. Since the retainer 52 for urging the alignment ball 51 toward the base axis 6 is provided, the alignment ball 51 that comes into contact with the base shaft 6 inserted into the base shaft insertion hole 11 in the holder body 10 from at least three directions is used as the base shaft. The retainer 52 is urged toward 6. Therefore, the base shaft 6 inserted into the base shaft insertion hole 11 can be reliably aligned.

Further, the alignment ball 51 is spherical, and the retainer 52 has an accommodating portion 522 for accommodating the alignment ball 51 at a predetermined position, and has elasticity to restore the alignment ball 51 moved at least in the circumferential direction to the original position. Since it is composed of the retainer 52, the alignment ball 51 housed in the accommodating portion 522 of the retainer 52 can be brought into contact with the base shaft 6 for accurate alignment.

More specifically, in order to accommodate the alignment ball 51, which is a spherical body having a low sliding resistance with respect to the outer plane 6a of the base shaft 6, in the accommodating portion 522 of the retainer 52, when the base shaft 6 is inserted into the base shaft insertion hole 11. Even if it is in contact with the alignment ball 51 made of a spherical body, it can be smoothly inserted.

Further, since the alignment ball 51 made of a spherical body is housed in the accommodating portion 522 of the retainer 52, the alignment ball 51 itself can be arranged at an appropriate position.
Further, since the accommodating portion 522 accommodating the alignment ball 51 is configured in the retainer 52, when the alignment ball 51 moves due to the insertion of the proximal shaft 6 into the proximal shaft insertion hole 11, the accommodating portion 522 accommodating the alignment ball 51 also , The retainer 52 is deformed and moved, and the alignment ball 51 can be urged against the base shaft 6 by the restoring force against the deformation of the retainer 52.

As described above, the retainer 52 having the accommodating portion 522 accommodating the alignment ball 51 functions as a regulator for regulating the position of the spherical alignment ball 51 and urges the alignment ball 51 with respect to the base axis 6. It can also function as a retainer 52, and the alignment ball 51 housed in the accommodating portion 522 of the retainer 52 can be brought into contact with the base shaft 6 for accurate alignment.

Further, since the pressure ring 70 for pressurizing the retainer 52 arranged in the penetration accommodation space 812 is provided, the base shaft 6 inserted in the base shaft insertion hole 11 can be centered more accurately.
More specifically, the retainer 52 is pressed by the pressure ring 70 to press the retainer 52 that urges the alignment ball 51 against the base shaft 6 inserted into the base shaft insertion hole 11 in the holder body 10 and brings it into contact with the base shaft 6 from at least three directions. The internal stress of the shaft 6 is increased, the urging force for urging the alignment ball 51 with respect to the base shaft 6 can be increased, and the base shaft 6 can be centered more accurately.

Further, since the retainer covers 53 and 54 that are attached to a part of the outer diameter of the retainer 52 and regulate the deformation of the outer diameter of the retainer 52 are provided, the deformation of the outer diameter of the retainer 52 is caused by the pressurization by the pressure ring 70. It can be suppressed and the internal stress of the retainer 52 is further increased. Therefore, the pressing force of the pressure ring 70 can be applied as an urging force in the direction in which the alignment ball 51 abuts on the base shaft 6 and is centered, so that the base shaft 6 can be centered with higher accuracy.

Further, the pressure ring 70 is provided with a through hole 71 through which the base shaft 6 can be inserted, and a screw thread 73 and a screw groove 815 on the tip side for screwing the pressure ring 70 and the mounting ring 81 in and out in the axial direction L. With the tip cap 60 that moves the pressure ring 70 in the axial direction L with respect to the mounting ring 81 by operating the screw 73 and the tip side screw groove 815 using the base shaft 6 inserted through the through hole 71 as a reaction force. Is provided, so that a desired pressing force can be applied with the base shaft 6 inserted to align the base shaft 6 with higher accuracy.

More specifically, by operating the screw 73 and the tip side screw groove 815 with the tip cap 60, the base shaft 6 inserted through the through hole 71 is used as a reaction force, that is, the base shaft 6 is inserted through the through hole 71. Then, the pressure ring 70 whose rotation is restricted with respect to the base shaft 6 is moved in the axial direction L with respect to the mounting ring 81. Then, the retainer 52 can be pressurized with a desired pressing force by the pressurizing ring 70.

Further, since the alignment ball 51 is arranged so as to abut the outer plane 6a forming all the corner portions 6b at equal intervals in the circumferential direction in the hexagonal cross-sectional shape with the corner portions 6b sandwiched, the base shaft The base shaft 6 inserted into the insertion hole 11 can be centered with high accuracy.

Because the alignment ball 51 abuts on the outer plane 6a forming all the corner portions 6b evenly spaced in the circumferential direction in the hexagonal cross-sectional shape, that is, in the circumferential direction in the hexagonal cross-sectional shape, etc. Since two or more alignment balls 51 are in contact with one corner 6b at all the spaced corners 6b so as to be sandwiched between them, the urging force of the retainer 52 acting through the alignment balls 51 is the base shaft insertion hole 11. It can be aligned with high accuracy toward the axial direction of the base shaft 6 inserted in.

When the retainer 52 in which the alignment ball 51 made of a spherical body is housed in the storage part 522 is arranged in the penetration storage space 812, at least two alignment balls 51 and the alignment ball 51 on both sides of one corner portion 6b are housed. The accommodating portion 522 moves in a direction in which the base shaft 6 is inserted into the base shaft insertion hole 11 so as to be separated from each other along the inner surfaces of the retainer covers 53 and 54 on the outer diameter of the alignment ball 51, so that the two alignment balls 51 are close to each other. It acts as an urging force in the direction of sandwiching the corner portion 6b between the two alignment balls 51, and can align the base shaft 6 inserted in the base shaft insertion hole 11 with higher accuracy.

Further, of the alignment balls 51 arranged on both sides of the plurality of corners 6b, the alignment ball 51 on one side and the alignment ball 51 on the other side when viewed from the axial direction L are different in position in the axial direction L. There is. Therefore, when at least two alignment balls 51 on both sides of one corner portion 6b and the accommodating portion 522 accommodating the alignment balls 51 move in a direction away from each other by inserting the base shaft 6 into the base shaft insertion hole 11, one corner The alignment ball 51 on one side of the axial L view in the portion 6b and the alignment ball 51 on the other side of the axial L view in the adjacent corner portion 6b are close to each other. However, of the alignment balls 51 arranged on both sides of the plurality of corners 6b, the alignment ball 51 on one side and the alignment ball 51 on the other side when viewed from the axial direction L are different in position in the axial direction L. Therefore, the alignment ball 51 on one side of the axial L-view at one corner 6b and the alignment ball 51 on the other side of the axial L-view at the adjacent corner 6b do not come close to each other and interfere with each other. By applying an urging force, the base shaft 6 inserted into the base shaft insertion hole 11 can be reliably aligned with high accuracy.

Further, the electric tool K provided with the motor M and a rotation transmission mechanism for transmitting the rotational force of the motor M on the axis, and the above-mentioned base shaft holder 1 rotatably provided by the rotation transmission mechanism is a base shaft holder. The base shaft 6 is centered by the centering adapter 40 attached to 1, and the rotating jig 5 can be rotated without misalignment.

In the above description, the centering bearing 50 is provided with the tip side retainer cover 53 and the base end side retainer cover 54, but as shown in FIGS. 13 and 14, the tip side retainer cover 53 is not provided and the axial tip side Lf is provided. The alignment bearing 50a may be provided with a base end side retainer cover 54a having a long ring-shaped portion extending from the bearing.

FIG. 13 shows a perspective view of the alignment bearing 50a of another embodiment, and FIG. 14 shows an explanatory diagram of alignment with the alignment adapter 40 of another embodiment. Specifically, FIG. 13A is a perspective view of the centering bearing 50a with a part of the front side in the circumferential direction cut out, and FIG. 13B is a perspective view of the retainer 52 to which the alignment ball 51 is assembled. It is a perspective view which cut out a part of the front side in the circumferential direction in the state where the base end side retainer cover 54a was separated.

FIG. 14 shows an explanatory view of the centering by the centering adapter 40, and FIG. 14A shows a vertical cross-sectional view of the base shaft holder 1 equipped with the centering adapter 40 with the base shaft 6 inserted. (B) shows an enlarged view of part b in FIG. 14 (a), and FIG. 14 (c) shows an enlarged view of part b in a state of being realigned by the tip cap 60.

As described above, the alignment bearing 50a shown in FIGS. 13 and 14 is configured by sandwiching the retainer 52 containing the alignment balls 51 from both sides in the axial direction L between the tip end side retainer cover 53 and the proximal end side retainer cover 54. Compared to the core bearing 50, as shown in FIG. 13, instead of not providing the tip-side retainer cover 53, a ring-shaped portion extending from the tilted portion of the retainer 52 facing the second inclined surface 524 to the axial tip-side Lf is provided. It is longer than the ring-shaped portion of the base end side retainer cover 54, extends beyond the accommodating portion 522b to the outside of the accommodating portion 522a, and by mounting the proximal end side retainer cover 54a from the axial proximal end side Lb of the retainer 52. The outer diameter of the alignment ball 51 housed in the housing portions 522a, 522b, and 522c can be integrally regulated.

As shown in FIG. 14, the alignment bearing 50a provided with the base end side retainer cover 54a configured in this way is also restricted to the tip cap 60 by rotating the tip cap 60 after inserting the base shaft 6. The position adjusting screw thread 816 and the screwing screw 73 of the mounting ring 81 are screwed in, and the pressure ring 70 whose rotation is restricted by the base shaft 6 moves to the axial base end side Lb.

The base end side tapered surface 76 of the pressure ring 70 that has been moved to the axial base end side Lb by the rotational operation of the tip cap 60 in the tightening direction is formed on the first inclined surface 523 and the accommodating portion 522a of the retainer 52 in the centering bearing 50a. The alignment ball 51 facing the housed alignment ball 51 and the base end side tapered surface 76 presses the alignment ball 51 housed in the first inclined surface 523 of the retainer 52 and the housed portion 522a toward the axial base end side Lb. (See FIG. 14 (c)).

The base end side retainer cover 54a in the alignment bearing 50a in which the alignment ball 51 housed in the first inclined surface 523 of the retainer 52 and the accommodating portion 522a by the base end side tapered surface 76 is pressed against the axial base end side Lb The axial proximal end side Lb is regulated by the inner surface of the reduced diameter tapered portion 813 in the mounting ring 81. Therefore, the rubber retainer 52 can be consolidated in the axial direction L between the base end side tapered surface 76 and the base end side retainer cover 54, and the internal stress of the retainer 52 can be increased.

As described above, the alignment bearing 50a is sandwiched from both sides by the alignment balls 51 with respect to the outer planes 6a on both sides of the corner portion 6b of the base shaft 6 when the internal stress of the retainer 52 increases, similarly to the alignment bearing 50. The restoring force of the retainer 52 acting on is increased. As a result, the base shaft 6 can be aligned with higher accuracy.

In correspondence between the configuration of the present invention and the above-described embodiment, the through hole of the present invention corresponds to the through hole 40a.
Similarly below
The rotating jig corresponds to the rotating jig 5,
The base axis corresponds to the base axis 6,
The centering means corresponds to the centering bearings 50 and 50a,
The base shaft holder corresponds to the base shaft holder 1,
The holder body corresponds to the holder body 10
The mounting member corresponds to the mounting unit 80,
The position adjustment part corresponds to the mounting ring 81,
The axial direction corresponds to the axial direction L,
The relative position adjusting means corresponds to the mounting ring 81 and the mounting adjusting ring 82.
The mountable centering device is compatible with the centering adapter 40 and
The first screwed part corresponds to the position adjustment screw groove 823,
The operation unit corresponds to the mounting ring 81 and the tip cap 60 that is fixed by rotation.
The second screw part corresponds to the position adjustment screw thread 816,
The tip tapered surface corresponds to the alignment inclined surface 191 and
The magnet corresponds to the ring magnet 83,
The arrangement space corresponds to the penetration accommodation space 812,
The contact portion corresponds to the alignment ball 51 and
The urging means corresponds to the retainer 52,
The containment section corresponds to the containment section 522,
The elastic containment corresponds to the retainer 52 and
The pressurizing means corresponds to the pressurizing ring 70,
Deformation control means correspond to retainer covers 53, 54, 54a,
The insertion hole corresponds to the through hole 71,
The screwing in / out means corresponds to the screwing screw 73 and the tip side screw groove 815.
The pressurizing operation part corresponds to the tip cap 60,
The drive unit corresponds to the motor M,
The rotation transmission means corresponds to the rotation transmission mechanism,
Although the power tool corresponds to the power tool K, the present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.
For example, the above-mentioned base shaft holder 1 may be attached not only to the electric tool K but also to a rotating electric tool such as a vibration drill or an electric screwdriver, or as a tool not only electric but also manually or an internal combustion engine as a drive source. It may be attached.

The rotating jig 5 can be a rotating drill bit, a plus or minus driver bit, or the like, and the base 6 of the rotating jig 5 is also called a tool shank. The base shaft 6 can be reliably centered by the base shaft holder 1 even if it has a polygonal cross section such as a rectangle or a circular cross section other than the hexagonal cross section.

Instead of the alignment ball 51 that moves in the radial center direction and abuts on the outer plane 6a of the base shaft 6 to align, it may be used as a means of contacting the outer plane 6a of the base shaft 6 by deformation such as extending in the radial center direction. For example, it may be composed of one component such as an elastic ring that is externally fitted so as to urge the outer peripheral surface of the base shaft 6 in the inward direction.

For example, instead of the alignment ball 51, it has a rotating shaft orthogonal to the axial direction L, is provided with a plurality of rolling elements such as rollers that are rotatable in the axial direction L, and is configured to abut on the outer plane 6a of the base shaft 6. You may. Further, a rolling element such as a roller or an alignment ball 51 is arranged on a rubber ring, and a rolling element such as a roller or an alignment ball 51 is urged inward by the urging force of the rubber ring to align the base shaft 6. It may be configured as follows.

Further, in the above-mentioned base shaft holder 1, 18 alignment balls 51 are arranged at equal intervals in the circumferential direction and aligned with the outer plane 6a straddling the corner portion 6b of the base shaft 6 having a hexagonal cross section. On the other hand, the twelve alignment balls 51 accommodated in the accommodating portion 522a and the accommodating portion 522b may be brought into contact with each other for alignment. Further, the six or eight alignment balls 51 are brought into contact with the outer plane 6a straddling the three or four corners 6b at equal intervals in the circumferential direction among the six corners 6b on the base shaft 6. You may align.

In the above description, the taper space 111 is provided at the base end portion of the base shaft insertion hole 11, and the base end inclined portion 8 of the base shaft 6 is centered in the taper space 111. On the other hand, instead of the taper space 111, it may be composed of another component arranged at the base end portion of the hole base end of the base shaft insertion hole 11, and the center portion 8a of the base end inclined portion 8 or the vicinity of the top portion 8a is centered and supported. It may be configured to do so. Furthermore, the top portion 8a of the base end inclined portion 8 does not have to be centered and supported.

The retainer 52 exerted a restoring force so that the alignment ball 51 housed in the housing portion 522 was urged toward the center of the base shaft 6. On the other hand, the two adjacent alignment balls 51 straddling the corner portion 6b may be urged to pull each other, or the adjacent alignment balls 51 straddling the corner portion 6b may be pressed so as to be close to each other. You may be urged. Further, although the retainer 52 and the alignment ball 51 are formed separately, they may be formed integrally.

The position adjusting tapered surface 814 of the mounting ring 81 was a tapered surface whose position could be adjusted so that the axial direction L of the alignment bearing 50 coincided with the axial direction L of the holder body 10 by the alignment inclined surface 191. On the other hand, it may be configured by a plurality of tapered surfaces separated by a predetermined interval in the circumferential direction, or may be configured to abut on the alignment inclined surface 191 at a plurality of locations.
The above-mentioned ring magnet 83 is mounted in the magnet fitting groove 825 of the mounting adjustment ring 82, but the mounting adjustment ring 82 itself may be composed of a magnet, or only a part of the mounting adjustment ring 82 is magnetized. It may be.

Further, in the above description, the position adjusting tapered surface 814 of the mounting unit 80 in the centering adapter 40 abuts on the alignment inclined surface 191 formed on the inner diameter side of the tip of the small diameter front body portion 12 in the holder body 10. It is configured to function as a position adjusting unit for aligning the axial direction of the centering adapter 40 with the axial direction of the holder body 10. On the other hand, for example, a tapered portion is provided on the outer peripheral side of the tip of the small diameter front body portion 12 of the holder body 10, and the portion on the inner diameter side of the axial base end side Lb of the mounting unit 80 is the small diameter front body of the holder body 10. The tip of the portion 12 may be brought into contact with the tapered portion on the outer peripheral side so that the axial direction of the centering adapter 40 coincides with the axial direction of the holder body 10.

1 ... Base shaft holder 5 ... Rotating jig 6 ... Base shaft 10 ... Holder body 40 ... Alignment adapter 40a ... Through holes 50, 50a ... Alignment bearing 51 ... Alignment ball 52 ... Retainer 53, 54, 54a ... Retainer cover 60 ... Tip cap 70 ... Pressurizing ring 71 ... Through hole 73 ... Screw screw 80 ... Mounting unit 81 ... Mounting ring 82 ... Mounting adjustment ring 83 ... Ring magnet 191 ... Alignment inclined surface 522 ... Accommodation part 812 ... Through accommodation space 815 ... Tip side Thread groove 816 ... Position adjustment screw thread 823 ... Position adjustment screw groove L ... Axial direction M ... Motor K ... Power tool

Claims (10)

1. A centering means that contacts the base shaft of the rotating jig that penetrates the through hole and aligns it.
   A mounting member that attaches the centering means to the tip of the holder body constituting the base holder that holds the base shaft inserted from the tip side, and
   A position adjusting unit whose position is adjusted so that the axial direction of the centering means coincides with the axial direction of the holder body,
   A relative position adjusting means for adjusting the relative position of the mounting member and the position adjusting portion in the axial direction is provided.
   A mounting type centering device that is attached to the base shaft holder and holds the base shaft in the base shaft holder.
2. The mounting member is provided with a first screw portion and is provided with a first screw portion.
   The relative position adjusting means is provided with an operating portion for performing an adjusting operation and a second screwed portion for screwing with the first screwed portion.
   The first aspect of claim 1, wherein the operating portion is operated to screw in and out the first screwed portion and the second screwed portion to adjust the relative position of the mounting member and the position adjusting portion in the axial direction. Mountable centering device.
3. The position adjustment unit
   The mounting type centering device according to claim 1 or 2, which is formed at the tip of a base shaft insertion hole in the holder body and whose position is adjusted by a tip tapered surface whose diameter is expanded toward the tip.
4. The mounting type centering device according to any one of claims 1 to 3, wherein the mounting member is provided with a magnet magnetically attached to the holder body which is a magnetic metal.
5. The position adjusting unit is provided with an arrangement space for arranging the centering means, and also
   The centering means is
   A contact portion inserted into the through hole and abutting from at least three directions on the base shaft,
   The mounted centering device according to any one of claims 1 to 4, further comprising an urging means for urging the contact portion toward the base axis.
6. The contact portion is composed of a spherical body.
   5. The urging means is composed of an elastic accommodating body having an accommodating portion for accommodating the spherical body at a predetermined position and having elasticity to restore the spherical body moved at least in the circumferential direction to the original position. Mounted centering device described in.
7. The mounted centering device according to claim 6, wherein a pressurizing means for pressurizing the elastic accommodating body arranged in the arrangement space is provided.
8. The mountable centering device according to claim 7, wherein a deformation regulating means is provided which is attached to a part of the outer diameter of the elastic accommodating body and regulates the deformation of the outer diameter of the elastic accommodating body.
9. The pressurizing means is provided with an insertion hole through which the base shaft can be inserted.
   A screw-in / out means for screwing in / out the pressurizing means and the position adjusting portion in the axial direction,
   A pressurizing operation unit is provided in which the screwing / removing means is operated by using the base shaft inserted into the insertion hole as a reaction force to move the pressurizing means in the axial direction with respect to the position adjusting unit. The mountable centering device according to claim 7 or 8.
10. A drive device and a rotation transmission means for transmitting the rotational force of the drive device on the axis are provided, and the drive device is provided.
    An electric tool in which the mounting type centering device according to any one of claims 1 to 9 is assembled to the base shaft holder.

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