JPH0691411A - Chuck with clamping device - Google Patents

Abstract

PURPOSE:To simply replace a rotational tool mounted in a chuck fixed to the main spindle of a machine tool. CONSTITUTION:A clutch with a clamping device is composed of a shaft 4 provided with a tapered shank 2 formed on the one end and a thin walled tool- mounting 3 formed on the other end, a clamping ring 6 fitted to a tapered side formed on the periphery of the tool mounting 3 via a needle bearing 5, a worm wheel 8 and a bearing part arranged on the extension 7 of the clamping ring 6 in the circumferential direction, a worm holder ring 10 concentrically fitted to the extension 7 and a member 13 for checking the rotation of the worm holder ring 10. And the chuck provided with a clamping device is equipped with a worm screw 11 which is supported on the worm holder ring 10 engaging with a worm wheel 8 and is designed so as to rotate the clamping ring 6 by means of worm screw 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck provided with a tightening device, which has a taper shank on one side of a chuck body and a holder part on the other side, has a taper collet at a fastening part, and is fixed to a spindle of a machine tool. It is intended to provide a chuck in which a rotary tool can be easily replaced in a state.

[0002]

2. Description of the Related Art A chuck for supporting a rotary tool such as a drill or an end mill has a taper shank for attaching to a spindle of a machine tool on one side of a chuck body, and a holder portion is formed on the other side of the extension line of the taper shank. It is a thing. Various types of chucks have been proposed. For example, a method in which the inner surface of the holder part is formed into a tapered surface, a collet with a tapered surface that matches this tapered surface is inserted, and the collet holder nut is screwed into the screw part formed on the outer periphery of the holder part and tightened. Of the chuck or the outer peripheral surface of the holder part is formed with a lower tapered surface, the needle cover is placed on the outer periphery of the needle bearing through the needle bearing, and the cover is rotated to move the cover forward to move the holder part. There is a needle chuck or the like whose diameter is slightly changed to grip a rotary tool.

[0003]

In the chuck having the above structure, it is necessary to rotate the collet holder nut and the needle bearing cover (hereinafter referred to as a tightening ring) when the rotary tool is attached and detached, and the tightening ring is rotated. In this case, it is necessary to apply a wrench to the tightening ring and apply a very large force to tighten and release it. Therefore, in order to perform such work, the chuck is fixed to the main shaft of the machine tool or the main shaft of the presetter in advance, and the main shaft is rotated at a low speed, or is fixed to the chuck fixing tool and the tightening ring body is attached to the tool. Had to use and rotate.

In particular, when exchanging a rotary tool of a chuck fixed to a spindle of a machine tool, a brake is applied to a gear mechanism which constitutes a drive mechanism of the spindle or a motor which drives the gear mechanism. It is necessary to fix the main shaft, loosen this chuck by operating the tightening ring of the chuck with a spanner or the like, and replace the rotating tool. However, this chuck is tightened with a considerably large force, and in many cases, it is firmly tightened by receiving a cutting torque during machining, so that it is difficult to easily rotate the tightening ring.

Changing rotating tools on a machine tool is extremely dangerous. That is, the rotary tool is often arranged at a position where it is easy to cut the work, and this place is often inconvenient for operating the chuck. Therefore, it is necessary to operate the chuck in an unreasonable posture to replace the rotary tool, and the chuck and the rotary tool held by the chuck are covered with oil, and the hands for operating the tightly tightened chuck must be operated. There are many accidents in which the hand is slipped and the hand is cut with the attached rotary tool. The main cause of this accident is that it is difficult to stop the spindle by some method and easily rotate the chuck attached to the spindle with a rotary tool.

The present invention has been made to solve the drawbacks of the above-mentioned conventional chucks, and enables the chucks to be easily released or tightened with a small torque without fixing the main shaft. To provide a chuck with a fastening device capable of

[0007]

A chuck with a tightening device according to the present invention for achieving the above object comprises a shaft 4 having a tapered shank 2 at one end and a thin tool supporting portion 3 at the other end, and the tool. A tightening ring 6 fitted on a tapered surface formed on the outer periphery of the support part 3 via a needle bearing 5, a worm wheel 8 and a bearing part 9a circumferentially formed on an extension part 7 of the tightening ring 6, A worm holder ring 10 fitted concentrically with the extension 7,
The worm screw 11 supported by the worm holder ring 10 is engaged with the worm wheel 8 and the tightening ring 6 is rotated by the rotation of the worm screw 11. Is configured.

[0008]

[Operation] By rotating the worm screw 11 supported by the worm holder ring 10, the tightening ring 6 can be easily rotated with a small torque to tighten and release the tool support 3.

[0009]

EXAMPLES Examples of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a chuck in which a main part is cut. The chuck 1 has a taper shank 2 at a rear part, a tool support part 3 (collet having a taper shank formed on a front part and a tapered outer surface). The needle roller bearing 5 is provided on the outer surface of the tool support 3 of the shaft 4 having the support.
A tightening ring 6 having an inner surface formed into a taper is fitted in through.

The tightening ring 6 has a structure particularly adopted in the present invention, and the extension portion 7 is extended, and the extension portion 7 is provided with a worm wheel 8. A worm holder ring 10 is supported on the extension portion 7 via a needle roller bearing 9. A worm screw 11 is provided on the worm holder ring 10.

A member 13 for stopping the rotation of the worm holder ring 10 is provided behind the worm holder ring 10 and in front of the fitting portion 12 with a screw 14.
A bearing 15 provided on the tip of an arm 13a fixed to the shaft 4 and extended forward of the member 13 is fitted in a groove 10a provided in the worm holder ring 10. FIG. 2 is a side view of the tightening ring 6, in which a knurl 6a is engraved on the outer surface of the front part, and an extension 7 has a worm wheel 8 and an inner race 9a for receiving a needle roller bearing 9, and a stopper ring 16. A groove portion 16a into which is inserted is formed.

FIG. 3 is a front view of the worm holder ring 10 in which a main part is sectioned, FIG. 4 is a side view of the same, and FIG. 5 is a plan view of the same. A groove 10b is opened in one side of the worm holder ring 10, and the worm screw 11 is inserted in the groove 10b.
And the shaft 10d is inserted from one of the groove portions 10c formed on both sides of the groove portion 10b to the other to support the worm screw 11. The shaft 10d has a square groove (hexagonal groove) portion 10e on one side and a stopper 10f on the other side to prevent the shaft from coming off. A ring 10g made of synthetic resin is provided as a bearing material between the bearing portions arranged on both sides of the worm screw 11 and the square groove portion 10e and the stopper 10f. A groove is provided along the shaft 10d, and a key 10h is fitted into the groove to drive the worm screw 11.

In FIG. 4, 9b is a portion forming the outer race of the needle bearing 9, and the retainer 9 of the needle bearing 9 is located at the outermost portion of this portion 9b.
c is formed as a ridge. FIG. 6 is a front view of the member 13 for preventing rotation of the worm holder, and FIG. 7 is a side view of the same, showing the arm portion orthogonal to the ring portion 13a attached to the side portion of the fitting portion 12 formed on the shaft 4. 13b is extended, this arm
A bearing 15 is provided at the tip of 13b. The ring 13 is fixed by screwing a screw 14 inserted into a hole 13c provided in the ring portion 13a onto the shaft 4, and is engaged with the worm holder ring 10 via a bearing 15, and the worm screw 11 is operated. It serves to prevent the worm holder ring 10 from rotating when the tightening ring 6 is rotated.

The members shown in FIGS. 2 to 7 are assembled as shown in FIG. 1, but when a rotary tool such as a drill or an end mill is fixed to the tool support portion 3 of the chuck 1, the tool support portion 3 is used. Insert the collet fitted to the shank part of the rotary tool into the shaft 10d that supports the worm screw 11.
A wrench is fitted into the square groove 10e formed at the end of the worm and the worm screw 11 is gradually rotated. Then, the tightening ring 6 rotates via the worm wheel 8 meshing with the worm screw 11.

When the tightening ring 6 is rotated, a large number of needle roller bearings 5 supported by the tapered surface formed on the outer surface of the collet 3 are rolled on the tapered surface while drawing a spiral to move the tightening ring 6. As the tightening ring 6 moves toward the back and moves toward the large diameter side of the tapered surface via the needle roller bearing 5, the tool support 3 is gradually tightened to tighten the rotary tool.

When the tightening ring 6 rotates, the worm holder ring 10 tries to rotate by receiving a reaction force, but since this rotating force is stopped by the member 13, the tightening ring 6 smoothly rotates to support the tool. The rotary tool can be fixed to the chuck 1 by moving to the larger diameter side of the tapered surface of the portion 3 and tightening the tool support portion 3. In addition,
When the rotary tool is removed, the reverse operation to the above operation can be performed.

[0017]

The chuck with the tightening device according to the present invention,
Tapered shank 2 at one end and thin tool support 3 at the other end
Formed on the outer circumference of the tool support portion 3, a tightening ring 6 fitted through a needle bearing 5 on a tapered surface, and an extension portion 7 of the tightening ring 6 formed in the circumferential direction. Worm wheel 8 and bearing portion 9a
A worm holder ring 10 concentrically fitted to the extension portion 7 and a member 13 for preventing the worm holder ring 10 from rotating, and the worm screw 11 supported by the worm holder ring 10 is attached to the worm screw. The tightening ring 6 is rotated by meshing with the wheel 8 and rotating the worm screw 11.

Therefore, by rotating the worm screw 11 supported by the worm holder ring 10 provided adjacent to the tightening ring 6, the tightening ring 6 is lightly rotated with a small torque to be formed on the tip of the shaft 4. Since the tool supporting portion 3 that is attached can be tightened or released, a rotary tool such as a drill or an end mill can be easily attached and detached. Moreover, since the operation of rotating the tightening ring 6 only rotates the worm screw 11, the rotary tool can be easily attached and detached while the chuck 1 is attached to the spindle of the machine tool.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a main part of a chuck according to an embodiment of the present invention.

FIG. 2 is a side view of a tightening ring.

FIG. 3 is a front view of a worm holder ring showing a cross section of a main part.

FIG. 4 is a side view of the same.

FIG. 5 is a plan view of the worm holder ring.

FIG. 6 is a front view of the worm holder rotation preventing member.

FIG. 7 is a side view of the worm holder rotation preventing member.

[Explanation of symbols]

1 Chuck 2 Tapered Shank 3 Tool Support 4 Shaft 6 Tightening Ring 7 Extension 8 Worm Wheel 11 Worm Screw 12 Fitting 13 Rotation of Worm Holder Ring
13a Ring part 13b Arm part 15 Bearing

Claims (1)

[Claims] 1. A shaft 4 having a tapered shank 2 at one end and a thin tool supporting portion 3 at the other end, and a tapered surface formed on the outer periphery of the tool supporting portion 3 are fitted with needle bearings 5 interposed therebetween. Tightening ring 6 and this tightening ring 6
A circumferentially formed worm wheel 8 and a bearing portion 9a on the extension 7, a worm holder ring 10 fitted concentrically with the extension 7, and a member 13 for preventing the worm holder ring 10 from rotating. And a worm screw 11 supported by the worm holder ring 10.
A chuck with a tightening device in which the worm wheel 8 is engaged with the worm wheel 8 to rotate the tightening ring 6 by the rotation of the worm screw 11.