JP2002355705A - Tool holder installation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly clamp a tool holder on the side of a main spindle even when a position of a taper shank of the tool holder is slightly dislocated concerning a tool holder installation device to install the tool holder on an end of the main spindle of a machine tool of such as a machining center. SOLUTION: This tool holder installation device constitutes its characteristic feature that an engaging surface of a clamp click member is engaged with an engaging surface of the hollow taper shank after a head end part of the clamp click member is extended in diameter as a projection part of the clamp click member is guided to the rear side of a storage recessed part of a guide shaft member by movement of a lock rod in the drawing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder mounting device for mounting a tool holder on a spindle end of a machine tool such as a machining center.

[0002]

2. Description of the Related Art Generally, in the field of machine tools, automatic machine tools such as a machining center equipped with an automatic tool changer (ATC) are widely used. In an automatic machine tool such as a machining center, a plurality of tools suitable for a predetermined cutting process are mounted on a tool holder, respectively.
It is stored in the magazine of the automatic tool changer.

When the automatic tool change operation starts, the magazine rotates and a desired tool is selected, and the tool is replaced with a tool already mounted on the tip of the spindle. This tool change process is performed while the tool is mounted on the tool holder. The conventional tool holder has a taper shank having a 7/24 taper, and a tapered hole complementary to the taper shank is provided at the tip of the main shaft.

The machining center is configured to fit the taper shank into the tapered hole of the main shaft and draw the tool holder rearward with the draw bar, thereby clamping the tool holder to the tip of the main shaft. On the other hand, recently, with the increase in the speed of cutting, a so-called two-face constraint type tool holder is being used instead of a conventional 7/24 taper tool holder.

While the conventional tool holder is supported on the main shaft only by the tapered surface, the two-surface restraint type tool holder is configured to be supported on the end surface of the main shaft in addition to the tapered surface. Have been. Various types of tool holders of the two-sided constraint type have been proposed. Recently, HSK has been added to the DIN 69893 standard set by the German Standards Association.
The shank is prescribed.

[0006] In the DIN 69893 standard, only the shape and dimensions of the HSK shank are specified, and the mounting mechanism of the HSK shank to the main shaft is not defined. Therefore, various mounting mechanisms have been proposed. As such a mounting mechanism, a mechanism disclosed in, for example, Japanese Patent Application Laid-Open No. 2-503768 is known.

[0007] In the mounting mechanism of this publication, the function of locking the HSK shank and the boosting mechanism that generates a tightening force are configured to be achieved by the same structure.
The mechanism is simplified.

[0008]

However, such a conventional mounting mechanism has the following problems in use. (1) If the HSK shank of the tool holder is separated from the end face of the spindle by a certain amount or more, it cannot be clamped.

(2) In some cases, the clamp pawl cannot be completely closed, and the tool holder cannot be inserted. (3) At the time of clamping, the mechanism may operate without the clamp claw being opened, and the following operation may be performed as if the mechanism was clamped in spite of being not clamped.

(4) It is difficult to detect a misclamp. The inventor of the present invention has conducted intensive studies to solve such a conventional problem, and as a result, has found that such a problem is caused by simultaneous execution of the clamping operation and the retracting operation. That is, when the HSK shank of the tool holder conveyed by the ATC is inserted into the tapered hole of the main shaft, the operation of expanding the clamp claws radially outward and the operation of pulling in the HSK shank and clamping are performed simultaneously. Therefore, when the HSK shank is separated from the main shaft end face as in (1), the clamp pawl moves without being securely engaged with the engaging groove inside the HSK shank.

[0011] Such a problem is particularly likely to occur when a tool is changed at a high speed.
The phenomena as described in (2), (3) and (4) become obvious as problems in use. The present invention has been made to solve such a conventional problem. Even if the position of the taper shank of the tool holder is slightly displaced, the tool holder can reliably clamp the tool holder to the main shaft side. It is an object to provide a mounting device.

[0012]

According to a first aspect of the present invention, there is provided a tool holder mounting device, wherein a hollow taper shank of a tool holder is inserted into a taper hole on a main shaft side, and an outer surface of the hollow taper shank and an inner surface of the taper hole. And a tool holder mounting device for mounting the tool holder on the spindle side by contacting an end surface of the tool holder with an end surface on the spindle side, wherein the rear end portion is disposed in the spindle. A lock rod detachably attached to a driving means disposed in the main shaft, a support member disposed outside the lock rod and moved by the movement of the lock rod, and a rear end portion of the support member. A plurality of clamp pawl members which are swingably supported and have an engaging surface on the outer side of a distal end portion which is engaged with a locking surface provided on an inner surface of the hollow tapered shank; and tips of the plurality of clamp pawl members Biasing means for biasing the clamp claw in the diameter reducing direction, and a projection formed inside the plurality of clamp claw members and fixed to the main shaft side and formed inside the clamp claw member is a clamp claw. And a guide shaft member having a storage recess formed therein when the member is reduced in diameter. The protrusion of the clamp claw member is formed by the movement of the lock rod in the retracting direction. After the leading end of the clamp claw member is expanded in diameter by being guided rearward, the engaging surface of the clamp claw member is engaged with the locking surface of the hollow tapered shank.

According to a second aspect of the present invention, in the tool holder mounting device according to the first aspect, after the engaging surface of the clamp claw member is engaged with the locking surface of the hollow taper shank. And a booster for increasing the retraction force of the lock rod and transmitting the same to the support member. The tool holder mounting device according to claim 3 is the tool holder mounting device according to claim 2, wherein the booster includes a through hole formed in the support member, a sphere disposed in the through portion, and A concave portion formed on the outer periphery of the lock rod and in which a part of the sphere is located, and an inclined surface fixed to the main shaft side outside the support member and inclined from the front side of the sphere toward the sphere. A locking member having the locking rod, wherein the retraction of the lock rod causes the sphere to be pressed against the inclined surface of the clamping member to increase the retraction force of the lock rod.

According to a fourth aspect of the present invention, there is provided a tool holder mounting apparatus according to any one of the first to third aspects, wherein the tapered hole on the main spindle side is detachable from an end face of the main spindle body. The clamp member is fixed directly or indirectly to the spindle end body. According to a fifth aspect of the present invention, there is provided the tool holder mounting apparatus according to any one of the first to fourth aspects, wherein a through hole is formed at the center of the lock rod and the guide shaft member. The distal end of the lock rod is inserted into the rear end of the guide shaft member.

(Function) In the tool holder mounting device of the first aspect, when the lock rod is moved in the retraction direction, the support member is moved in the retraction direction, and the clamp claw member is moved in the retraction direction. Due to the movement of the clamp claw member in the retracting direction, the protrusion formed inside the clamp claw member is disengaged from the storage recess formed on the guide shaft member,
Guided to the rear side of the storage recess of the guide shaft member, the distal end of the clamp claw member expands in diameter against the urging force of the urging means.

[0016] Thereafter, the engaging surface of the clamp claw member is engaged with the engaging surface of the hollow taper shank by further moving the clamp claw member in the retracting direction. In the tool holder mounting device according to claim 2, the retraction force of the lock rod is increased by the booster means and transmitted to the support member,
The engagement surface of the clamp claw member is firmly engaged with the engagement surface of the hollow taper shank by the force transmitted to the support member.

According to the third aspect of the present invention, when the lock rod is further moved in the retracting direction after the engaging surface of the clamp claw member comes into contact with the engaging surface of the hollow taper shank, the sphere is moved in the radial direction. The ball is moved outward, and the sphere is pressed against the inclined surface of the clamp member.

The reaction force causes the support member to be pulled in with a higher pulling force than the locking rod. In the tool holder mounting device of the fourth aspect, the spindle end body having the tapered hole on the spindle side is detachably fixed to the end face of the spindle main body, and the clamp member is directly or indirectly fixed to the spindle end body. Is done.

Therefore, the tool holder mounting device can be easily and reliably incorporated into the main spindle body as a unit. In the tool holder mounting device according to claim 5, the coolant,
After the fluid such as compressed air and oil mist passes through the through hole of the lock rod, it is supplied to the tool holder through the through hole of the guide shaft member.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the tool holder mounting device of the present invention. In this embodiment, the tool holder mounting device of the present invention is mounted as a clamp unit 13 on the tip of a main shaft 11 of a machine tool.

The main shaft portion 11 has a through hole 1 provided with a driving mechanism 15 (not shown in detail) which moves in the axial direction at the rear portion inside.
1a, and a clamp unit 13 is mounted on the opening end side of the through hole 11a. The clamp unit 13 includes a lock rod 17, a support cylinder 19, a clamp sleeve 21,
Clamp pawl holder 23, guide shaft 25, clamp pawl 2
7, steel ball 29 and ring spring 31 are main components.

The rear end of the lock rod 17 has a drive mechanism 1.
5, and is formed with a through-hole 17a through which a fluid flows along the central axis. A large diameter shaft portion 17b is formed at the center of the lock rod 17, and a concave portion 17c having an arc-shaped cross section is formed in the large diameter shaft portion 17b.

On the front side of the concave portion 17c, for example, a tapered surface 17 inclined at an angle of 50 degrees with respect to the axial length direction is provided.
d is formed. Large diameter shaft part 17 of lock rod 17
The front side of b is a small-diameter shaft portion 17e.
In e, seal members 33 and 35 are attached at intervals. A flange 17f is formed at the rear of the large-diameter shaft 17b of the lock rod 17.

A driving mechanism 1 is provided at the rear end of the large-diameter shaft portion 17b.
For example, an engaging means 17h composed of a bayonet joint, which is connected to the connecting member 5, is disposed. A fluid connection shaft 17i is formed behind the engaging means 17h, and a seal member 37 is mounted on the fluid connection shaft 17i. A support cylinder 19 that is moved by the movement of the lock rod 17 is disposed outside the lock rod 17.

The support cylinder 19 has a large diameter portion 19a fitted on the large diameter shaft portion 17b of the lock rod 17,
On the front side of the large-diameter portion 19a, a small-diameter portion 19b fitted to the small-diameter shaft portion 17e of the lock rod 17 is formed. A large diameter portion 19a of the support cylinder 19 has a pair of through holes 19 formed therein.
c are formed facing each other.

A steel ball 29 is fitted in these through holes 19c. Part of the steel ball 29 is accommodated in a concave portion 17c formed on the outer periphery of the lock rod 17. A clamp sleeve 21 is disposed outside the large diameter portion 19a of the support cylinder 19.

A seal member 39 is disposed between the front inner surface of the clamp sleeve 21 and the support cylinder 19.
A seal member 41 is arranged between the outer surface of the clamp sleeve 21 and the hole 11b of the main shaft portion 11.
In the center of the clamp sleeve 21, a first inclined surface 21a and a second inclined surface 21b which are inclined toward the steel ball 29 from the front side of the steel ball 29 are formed.

The first inclined surface 21a is inclined at an angle of, for example, 30 degrees with respect to the axial direction, and the second inclined surface 2a is inclined.
1b is inclined at an angle of, for example, 45 degrees with respect to the axial direction. Then, the steel ball 2 placed on the support cylinder 19
9 and the clamp sleeve 21, the lock rod 1
A booster mechanism 43 is configured to increase the pull-in force of the lever 7 and transmit the same to the support cylinder 19.

On the front side of the support cylinder 19, a guide shaft 25 is arranged. In the axial length direction of the guide shaft body 25,
A through hole 25a is formed. The tip of the lock rod 17 is inserted into a hole 25b formed at the rear end of the guide shaft 25. A seal member 45 is disposed in a hole 25 c formed at the tip of the guide shaft 25.

The seal member 45 includes a tool holder 47.
Is inserted into the center of the inner surface of the hollow taper shank 47a. A storage recess 25d is formed substantially at the center of the guide shaft 25, and a guide shaft 25e is formed behind the storage recess 25d. Outside the guide shaft 25, four clamp claws 27 are arranged concentrically.

At the rear end of the clamp claw 27, a protrusion 27
The projection 27a is swingably engaged with an outer circumferential groove 19d formed in the support cylinder 19. A projection 27b protruding inward is formed substantially inside the center of the clamp claw 27.

When the diameter of the clamp claw 27 is reduced, the protrusion 27b is formed in the storage recess 2 formed on the outer periphery of the guide shaft 25.
5d. Projection 27 of clamp sleeve 21
A recess 27c is formed inside the front side of b. The concave portion 27c is provided with a shaft portion 25f formed on the front side of the housing concave portion 25d of the guide shaft body 25 when the diameter of the clamp claw 27 is reduced.
Contacted.

On the outer side of the tip of the clamp claw 27, there is formed an engaging surface 27d which is engaged with a locking surface 47d provided on the inner surface of the hollow portion 47c of the hollow taper shank 47a. That is, a concave portion 47e is formed on the inner surface of the hollow portion 47c of the hollow taper shank 47a of the tool holder 47, and a locking surface 47d is formed in the concave portion 47e.
A recess 27e is formed at the tip of each of the four clamp claws 27, and a ring spring 31 for urging the four clamp claws 27 in the radially-reducing direction is arranged in the recess 27e.

In this embodiment, a spindle end body 49 is detachably fixed to the end face of the spindle section 11, and the spindle end body 49 is formed with a tapered hole 49a on the spindle side.
The tapered hole 49a has a shape corresponding to the tapered surface 47f on the outer periphery of the hollow tapered shank 47a (HSK shank) of the tool holder 47. The clamp sleeve 21 is fixed to the spindle end body 49 via the clamp pawl 23.

The clamp claw holder 23 has a cylindrical shape, and a flange portion 23 a is fixed to a rear surface of the spindle end body 49 via a bolt 51. On the front surface of the flange portion 23a,
An annular protrusion 23b is formed, and the annular protrusion 23b is formed.
Is fitted into the hole 49b of the spindle end body 49. The outer periphery of an arc-shaped projection 27 f projecting from the outer periphery of the rear end of the clamp claw 27 is in contact with the inner periphery of the clamp claw holder 23.

The clamp sleeve 21 is connected to the rear surface of the clamp pawl 23 via a pin 53 for positioning. FIG. 3 is a front view of the clamp unit 13 shown in FIG.
FIG. 4 is a perspective view showing a clamp claw holder 23, a guide shaft 25, and a clamp claw 27.

In these figures, four clamp claws 2
7 are arranged concentrically outside the guide shaft body 25. At the rear end of the guide shaft 25, a base 25h is formed in a cross shape. The base 25h is fitted into a cutout groove 23c of an annular projection 23b formed at the tip of the clamp claw holder 23.

The clamp unit 13 configured as described above is fixed to the main shaft portion 11 via a main shaft end body 49. That is, members constituting the clamp unit 13, such as the clamp claw holder 23, the clamp sleeve 21, the support cylinder 19, the lock rod 17, the guide shaft 25, and the clamp claw 27, are previously assembled to the spindle end body 49. .

Then, the spindle end body 49 is connected to the lock rod 17.
The lock rod 1 is inserted into the main shaft 11 from the rear end side.
7 is engaged with the driving mechanism 15 by a rotation operation or the like.
Linked to Although not shown, the spindle end body 4
9 is fixed to the main shaft portion 11 with bolts or the like, thereby completing the attachment.

The operation of the clamp unit 13 will be described below. First, as shown in FIG. 1, the hollow tapered shank 47 a of the tool holder 47 is inserted into the tapered hole 49 a of the spindle end body 49.

At this time, since the four clamp claws 27 are in the unclamped state, their diameters are reduced by the ring spring 31, and the projections 27 b of the clamp claws 27 are
In the storage recess 25d. Then, the hollow tapered shank 47a is inserted into the tapered hole 49a of the spindle end body 49 until the tip of the clamp claw 27 contacts the bottom surface of the hollow portion 47c of the hollow tapered shank 47a.

Next, in this state, the drive mechanism 15 is moved rightward in the drawing (hereinafter referred to as the retracting direction), and the lock rod 17 is moved in the retracting direction. By the movement of the lock rod 17, the support cylinder 19 is moved in the retracting direction via the steel ball 29, and the clamp claw 27 is moved in the retracting direction. The protrusion 27 formed inside the clamp claw 27 by the movement of the clamp claw 27 in the retraction direction.
b comes off the storage recess 25d formed in the guide shaft 25 and rides on the guide shaft 25e on the rear side of the storage recess 25d of the guide shaft 25.

By this operation, the tip of the clamp claw 27 is moved to the protrusion 27a formed at the rear end of the clamp claw 27.
With the projection 27f as a fulcrum, the diameter is expanded against the urging force of the ring spring 31. The engagement surface 27d formed on the outside of the clamp claw 27 is
The diameter is increased to the concave portion 47e formed on the inner surface of 7a.

Then, the clamp claw 27 is moved to the guide shaft 25e.
Is further moved in the retraction direction along the engagement surface 27d.
Is in contact with the locking surface 47d of the hollow tapered shank 47a. Thereby, the tapered surface 47 f of the hollow tapered shank 47 a of the tool holder 47 is firmly fitted into the tapered hole 49 a of the spindle end body 49. Next, in this embodiment, the pull-in force of the lock rod 17 is increased by the force-intensifying mechanism 43 and transmitted to the support cylinder 19, and the force transmitted to the support cylinder 19 causes the engagement surface of the clamp claw 27 to engage. 2
7d is firmly engaged with the locking surface 47d of the hollow tapered shank 47a.

The operation of the booster 43 will be described below. In the unclamped state shown in FIG.
The radial position is regulated by the concave portion 17c of the lock rod 17 and the inclined surfaces 21a and 21b of the clamp sleeve 21. Then, when the locking operation is started and the lock rod 17 is moved in the retracting direction, the steel ball 29 moves together with the concave portion 17c of the lock rod 17.

At this time, the support cylinder 19 is also pushed by the steel ball 29 and moves in the retraction direction. When the steel ball 29 moves in the retracting direction, the clamp sleeve 21 is fixed to the spindle end body 49 via the clamp claw 27, so that the clamp ball 21 is located between the inclined surfaces 21 a and 21 b of the clamp sleeve 21 and the steel ball 29. Gaps occur. In the initial stage, the steel ball 29 abuts on the first inclined surface 21a having a gentle inclination, and thereby the steel ball 2
The amount by which the lock rod 9 is pushed out in the radial direction is reduced, and the movement stroke of the lock rod 17 in the retraction direction can be efficiently used for the movement of the clamp claw 27.

When the engaging surface 27d of the clamp claw 27 comes into contact with the locking surface 47d of the hollow taper shank 47a, the clamp claw 27 and the support cylinder 19 cannot move.
When the lock rod 17 is further moved in the retracting direction from this state, the steel ball 29 is pushed radially outward by the second inclined surface 21b, and the steel ball 29 is
The first second inclined surface 21b is strongly pressed.

By this reaction force, the support cylinder 19 is pulled in with a pulling force higher than the pulling force of the lock rod 17, for example, about twice as much. In this embodiment, it has been confirmed that when the pulling force for pulling the lock rod 17 is 9500 N (Newton) at the maximum, the force for pulling the tool holder 47 is approximately doubled to 18000 N.

The increase ratio is determined by the angle of the tapered surface 17d of the lock rod 17 or the angle of the clamp sleeve 2.
It can be easily adjusted by changing the angle of the first second inclined surface 21b. In the above-described clamp unit 13, when removing the tool holder 47, the driving mechanism 15 is moved in the direction opposite to the pull-in direction, so that the operation opposite to the above-described mounting operation is performed. The diameter is reduced inward from the concave portion 47e of the hollow taper shank 47a by the elastic force of the ring spring 31, and again,
In the state shown in FIG. 1, the tool holder 47 is pushed out by the tip of the clamp claw 27, so that the tool holder 47 can be taken out and the tool can be replaced.

In the above description, the case where the tool holder 47 is manually changed is shown. However, in actuality, in a machine tool such as a machining center, automatic tool change is performed under automatic control. It is performed by the device. In the tool holder mounting device described above, the protrusion 27b of the clamp claw 27 is guided to the rear side of the storage recess 25d of the guide shaft 25 by the movement of the lock rod 17 in the retracting direction, and the tip of the clamp claw 27 is moved. After the diameter is enlarged, the engagement surface 27d of the clamp claw 27 is fixed to the engagement surface 47d of the hollow taper shank 47a.
Therefore, even if the position of the hollow taper shank 47a of the tool holder 47 is slightly shifted, the tool holder 47 can be reliably clamped to the main shaft side.

That is, in the above-described tool holder mounting device, a time difference is provided between the diameter increasing function and the retracting function of the clamp claw 27, and the clamp claw 27 is securely connected to the locking surface 47d of the hollow taper shank 47a. Since the retracting action starts after the diameter is increased to the position where it is located, it is possible to securely clamp, and it is possible to securely attach and detach even at the time of high-speed replacement.

At the time of replacement work by the automatic tool changer, the hollow taper shank 47a of the tool holder 47 is inserted into the taper hole 49a on the main shaft side, and the hollow taper shank 4
Even if the end face of 7a is separated from the end face of the spindle end body 49, the diameter of the clamp claw 27 can be increased to ensure that the clamp claw 27
Of the hollow taper shank 47a, the end face of the hollow taper shank 47a is securely brought into close contact with the end face of the spindle end body 49. Can be clamped.

In the above-described tool holder mounting device,
Since the pull-in force of the lock rod 17 is increased and transmitted to the support cylinder 19 by the booster mechanism 43, the tool holder 47 can be firmly clamped to the main shaft side.
Since the steel ball 29 is moved outward by the retraction of the lock rod 17 and pressed against the inclined surface 21b of the clamp sleeve 21, the retraction force of the support cylinder 19 can be increased easily and reliably.

In the above-described tool holder mounting device,
Since the spindle end body 49 having the tapered hole 49a on the spindle side is detachably fixed to the end face of the spindle 11,
The tool holder mounting device can be easily and reliably incorporated into the spindle 11 as the clamp unit 13. Further, in the above-described tool holder mounting device, the lock rod 1
7 and through holes 17a, 25a at the center of the guide shaft 25.
And the front end of the lock rod 17 is inserted into the rear end of the guide shaft 25, so that fluid such as coolant, compressed air, oil mist, etc. can be easily and reliably supplied to the tool holder 47 side. Can be.

Also, the engagement surface 27d of the clamp claw 27
Since the abutment surface 47d of the hollow taper shank 47a is accurately brought into contact with the engagement surface 47d, wear of the engagement surface 27d and the engagement surface 47d can be reduced. That is, for example, in the case of a clamp claw of which the tip is opened in a swiveling manner or a type in which the diameter is enlarged in a parallel manner, it is difficult to hit the surface at a point other than a certain point.

In the above-described tool holder mounting device, the tip of the four clamp claws 27 is tapered, so that even if the ring spring 31 for reducing the diameter of the clamp claws 27 is broken, the tool holder is not attached. 47 hollow taper shank 4
Since it is forcibly closed and inserted into the hollow portion 47c of 7a, reliability can be improved. Note that, in the above-described embodiment, an example in which the clamp claw 27 is divided into four members has been described. However, the present invention is not limited to such an embodiment, and it is sufficient if the clamp claw 27 is divided into two or more.

In the above-described embodiment, the spindle 11
Although the example in which the spindle end body 49 is detachably fixed has been described above, the present invention is not limited to such an embodiment, and can be applied to a conventional and well-known integral type spindle structure for an HSK shank. . In this case, there is a limitation in the radial direction, and it is necessary to change the outer shape of the clamp claw holder 23 and the method of fixing the clamp claw holder 23 to the main shaft portion 11, but this can be done in the scope of design change.

Also, the mounting direction can be installed not from the front end side of the main shaft portion 11 but from the rear end side.
Can be changed according to the structure of the machine tool.

[0059]

As described above, in the tool holder mounting device according to the first aspect, the projection of the clamp claw member is guided to the rear side of the storage recess of the guide shaft member by the movement of the lock rod in the retracting direction. After the distal end portion of the clamp claw member is expanded, the engaging surface of the clamp claw member is engaged with the locking surface of the hollow taper shank, so that the position of the taper shank of the tool holder is slightly shifted. Also, the tool holder can be securely clamped to the main shaft.

In the tool holder mounting device according to the second aspect, the pull-in force of the lock rod is increased by the booster and transmitted to the support member, so that the tool holder can be firmly clamped to the main shaft side. it can. In the tool holder mounting device according to the third aspect, the sphere is moved outward by the retraction of the lock rod and pressed against the inclined surface of the clamp member, so that the retraction force of the support member can be easily and reliably increased. it can.

In the tool holder mounting device according to the fourth aspect, the spindle end body having the tapered hole on the main shaft side is detachably fixed to the end surface of the main spindle body. , Can be easily and reliably incorporated into the main spindle body. In the tool holder mounting device according to the fifth aspect, the through hole is formed at the center of the lock rod and the guide shaft member, and the front end of the lock rod is fitted into the rear end of the guide shaft member. Fluid such as oil mist can be easily and reliably supplied to the tool holder side.

[Brief description of the drawings]

FIG. 1 is a vertical front view showing a state of an embodiment of a tool holder mounting device of the present invention at the time of unclamping.

FIG. 2 is a longitudinal sectional view showing a state at the time of clamping of the tool holder mounting device of FIG. 1;

FIG. 3 is a front view showing the tool holder mounting device of FIG. 1 without a spindle end body.

FIG. 4 is a view showing a clamp claw press of the tool holder mounting device of FIG. 1;
It is a perspective view which shows a guide shaft member and a clamp claw member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main shaft part 13 Clamp unit 15 Drive mechanism 17 Lock rod 17c Depression 19 Support cylinder 19d Peripheral groove 21 Clamp sleeve 21a First inclined surface 21b Second inclined surface 23 Clamp claw holder 25 Guide shaft body 25d Storage recess 25e Guide shaft 27 Clamping Claw 27a Projection 27b Projection 27d Engagement Surface 29 Steel Ball 31 Ring Spring 43 Booster Mechanism 47 Tool Holder 47a Hollow Tapered Shank 47c Hollow 47d Locking Surface 49 Main Shaft End 49a Tapered Hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Sugimura 239 Shimohirama, Saiwai-ku, Kawasaki City, Kanagawa Prefecture Inside Kuroda Seiko Co., Ltd. (72) Inventor Masanao Kato 1-1-1, Asahimachi, Kariya City, Aichi Prefecture In-house (72) Inventor Koichi Sakai 1-1-1, Asahi-cho, Kariya-shi, Aichi Pref.

Claims (5)

[Claims] 1. A hollow taper shank of a tool holder is inserted into a taper hole on a main shaft side to bring an outer surface of the hollow taper shank into contact with an inner surface of the taper hole, and an end surface of the tool holder is connected to the main shaft. A tool holder mounting device for mounting the tool holder on the main spindle side by abutting against an end surface of the main shaft, wherein the rear end portion is disposed in the main spindle and a rear end portion is detachably mounted on driving means disposed in the main spindle. A lock rod, a support member disposed outside the lock rod and moved by the movement of the lock rod, a rear end portion of which is swingably supported by the support member, and the hollow taper outside a front end portion. A plurality of clamp claw members having an engagement surface engaged with a locking surface provided on the inner surface of the hollow portion of the shank; and a biasing member for biasing distal ends of the plurality of clamp claw members in a radially decreasing direction. Means A guide formed inside the plurality of clamp pawl members and fixedly disposed on the main shaft side, wherein a projection formed inside the clamp pawl member has a housing recess formed therein to be accommodated when the clamp pawl member is reduced in diameter. A shaft member; and the protrusion of the clamp claw member is guided to the rear side of the storage recess of the guide shaft member by the movement of the lock rod in the retracting direction, so that the distal end of the clamp claw member is moved. The tool holder mounting device, wherein after the diameter is enlarged, the engaging surface of the clamp claw member is engaged with the locking surface of the hollow taper shank. 2. The tool holder mounting device according to claim 1, wherein the retraction force of the lock rod is increased after the engagement surface of the clamp claw member is engaged with the engagement surface of the hollow taper shank. A tool holder mounting device, comprising: a booster for transmitting the force to the support member. 3. The tool holder mounting device according to claim 2, wherein the booster is formed on a periphery of the lock rod, a through hole formed in the support member, a sphere disposed in the penetrating portion. A recess in which a part of the sphere is located; and a clamp member fixedly disposed on the main shaft side outside the support member and having an inclined surface inclined from the front side of the sphere toward the sphere. A tool holder mounting device, wherein, by retracting the lock rod, the sphere is pressed against the inclined surface of the clamp member to increase a retracting force of the lock rod. 4. The tool holder mounting device according to claim 1, wherein the tapered hole on the spindle side is formed in a spindle end body detachably fixed to an end face of the spindle main body. A tool holder mounting device, wherein the clamp member is directly or indirectly fixed to the spindle end body. 5. The tool holder mounting device according to claim 1, wherein a through hole is formed at the center of the lock rod and the guide shaft member, and a tip end of the lock rod is formed. A tool holder mounting device, which is inserted into a rear end of the guide shaft member.