JPH1148012A - Chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform centering work of holding claws by easily position- adjusting the holding claws in the radial direction of a chuck in relation to claw supporting bodies. SOLUTION: Three claw supporting bodies 2 are provided in a chuck body 1, and holding claws 7 are amounted to the front faces of the respective supporting bodies 2 so that they can oscillate around supporting shafts 13, respectively. The supporting shaft 13 is provided at the claw supporting body 2 in parallel with the axis of the chuck, and a fitting hole 19 the diameter of which is larger than that of the supporting shaft 14, is formed in the holding claws 7. Then, an eccentric collar 20 is turnably interposed between the fitting hole 19 and the supporting shaft 13, and a flange part 21 is fixed by selectively screwing set screws 22 into plural screw holes 23. The eccentric collar 20 is turned to position-adjust the holding claws 7 in the radial direction of the chuck in relation to the claw supporting body 2, and thus to positively bring a pair of holding parts 8 of the holding claws 7 into contact with the scroll part Wa of a work W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck having a work centering function.

[0002]

2. Description of the Related Art When processing a workpiece having a non-circular outer diameter, such as a scroll-type workpiece or a cast workpiece, the chuck needs to have a centering function. For example, in the conventional chuck shown in FIG. 5, three gripping claws 52 are swingably attached to a chuck body 51 by a shaft 53, and two gripping pieces 54 are provided on each gripping nail 52, so that a total of six gripping claws 52 are provided. Piece 5
4, the work W is centered and gripped.
However, there is a case where the workpiece W cannot be accurately centered only by the swinging movement of the gripping claws 52. Therefore, each gripping claw 52 is provided with a spacer 55 for finely adjusting the gripping piece 54 in the chuck radial direction. .

[0003]

However, according to the conventional chuck, since the centering function is complemented by the spacer 55, it is necessary to prepare a number of types of spacers 55 and to attach and detach them to a number of places. Therefore, there is a problem that the centering work is troublesome.

Accordingly, an object of the present invention is to provide a chuck that can easily perform a centering operation.

[0005]

In order to solve the above-mentioned problems, a chuck according to the present invention is provided with a plurality of jaw supports movably in the chuck radial direction on a chuck body, and a work is provided on the front surface of each jaw support. Attach the gripping claw to grip, provide a support shaft parallel to the chuck axis on either the claw support or the gripping claw, form a fitting hole with a larger diameter than the support shaft on the other, and An eccentric collar is rotatably interposed between the support shaft and the eccentric collar is rotatably operated to adjust the position of the gripping claw with respect to the claw support in the chuck radial direction (claim 1).

Further, in order to securely grip a deformed workpiece and prevent interference between the workpiece and the gripping claws at the time of mounting, the chuck according to the present invention has a plurality of gripping portions formed on the gripping claws. It is provided so as to be swingable around the axis of the support shaft, and is provided with a member for adjusting the swing range of the gripping claw.

Here, particularly in the case of a scroll-type work, the grip portions are arranged along a spiral curve in order to reliably grip each portion in the circumferential direction (claim 3).

Further, in the chuck according to the present invention, the member for positioning the work around the chuck axis can be adjusted on the front surface of the chuck body so that the centering operation of the gripping claws can be omitted in the continuous processing of the same work. (Claim 4).

In the chuck of the present invention, a member for receiving the work in a plane perpendicular to the chuck axis is provided on the front surface of the gripping claw so that the work can be mounted at an accurate position in the chuck axis direction. 5).

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a chuck used for processing a scroll type work (for example, a fixed scroll member of a compressor for an air conditioner). In this chuck, three jaw supports 2 are provided on a chuck body 1 so as to be movable in the chuck radial direction. The claw support 2 has a base jaw 4 assembled to the front surface of the master jaw 3 with bolts 5 and is opened and closed by a draw bar (each not shown) via a wedge member engaging with the master jaw 3.

A gripping claw 7 for gripping the scroll portion Wa of the work W is attached to the front surface of the base jaw 4. Each gripping claw 7 is provided with a high place 7a and a low place 7b.
A pair of grips 8 are formed on the inner peripheral side of b. A total of six gripping portions 8 are arranged along the spiral curve of the scroll portion Wa, so that the scroll-type workpiece W can be reliably gripped at different positions in the chuck radial direction. Note that a balancer 6 for correcting imbalance due to the difference in the mass of each gripping claw 7 is attached to the front surface of the chuck body 1.

In order to receive the work W in a plane orthogonal to the chuck axis, receiving members 10A to 10C each having a stopper 9 are attached to each gripping claw 7 with bolts 11. The stoppers 9 of the receiving members 10A, 10B, 10C abut on the rear end face of the flange portion (flange) Wb of the work W. Therefore, the work W can be mounted at an accurate position in the chuck axis direction by these stoppers 9.

Next, the mounting structure of the gripping claws 7 will be described in detail. Each gripping claw 7 is swingably attached to the claw support 2 by a support shaft 13. A groove 15 is formed in the back of the gripping claw 7 to be loosely fitted to the rail 14 of the base jaw 4 (FIG. 3).
Reference), the swing of the gripping claws 7 at the time of clamping is allowed, and the two gripping parts 8 can both contact the peripheral surface of the scroll part Wa.

An adjusting bolt 16 for adjusting the swing range is screwed onto the gripping claw 7 so as to protrude into the groove 15, and is loosened by a nut 17. Therefore, there is no possibility that the gripping claws 7 are largely tilted by their own weight in the unclamped state, and the work W can be mounted smoothly without interference with the gripping claws 7.

The support shaft 13 is a stepped set screw for tightening the base jaw 4 and is screwed to the claw support 2 in a direction parallel to the chuck axis. A fitting hole 19 having a larger diameter than the support shaft 13 is formed in the lower portion 7b of the gripping claw 7, and an eccentric collar 20 is provided between the fitting hole 19 and the support shaft 13.
Are rotatably interposed. And the eccentric collar 20
It is configured that the gripping claw 7 can be adjusted in position in the chuck radial direction with respect to the claw support 2 by the turning operation of.

A flange 21 is provided at the front end of the eccentric collar 20.
This flange portion 21 is selectively fixed to five screw holes 23 of the gripping claw 7 with a set screw 22, and the fitting hole 1 is formed.
9 is fixed to the board. For example, as shown in FIG.
When the eccentric collar 20 is rotated by 180 ° from the screw hole 23a at one end to the screw hole 23b at the other end, the grip 8 approaches the chuck center by a distance L. Therefore, the three gripping claws 7 can be centered in a short time in accordance with the outer diameter shape of the scroll portion Wa by a simple operation of simply turning the eccentric collar 20 and fixing it with the set screw 22.

On the other hand, a Y-shaped positioning member 25 is mounted on the front surface of the chuck body 1 with bolts 26, and a recess 27 is formed in one of the positioning members. In the recess 27, a block 28 is swingably supported by a bolt 29 on the center side of the chuck. A free end of the block 28 is provided with a projection 30 that abuts on the edge of the scroll portion Wa.

The work W can be positioned around the chuck axis by finely adjusting the position of the projection 30 in the chuck circumferential direction with the adjusting bolt 31 and fixing the position with the fixing bolt 32. Therefore, when each workpiece W is mounted on the basis of the protrusion 30 in the continuous processing of the same workpiece, the relative distance between the scroll portion Wa and the three gripping claws 7 can be always kept constant, and the center of the gripping claws 7 can be maintained. There is an advantage that the feeding operation can be omitted.

The present invention is not limited to the above embodiment, but may be carried out by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention as exemplified below. It is possible. (1) In the above embodiment, the support shaft 13 is provided on the claw support 2 side, but the support shaft may be provided on the gripper claw side. In this case, a fitting hole in which the support shaft fits is formed on the claw support side, and an eccentric collar is rotatably interposed between the fitting hole and the support shaft. (2) In the above embodiment, the position of the gripping pawl 7 is adjusted in five steps by intermittent rotation operation of the eccentric collar 20, but the position of the gripping pawl is steplessly adjusted using a screw-in eccentric collar. You may comprise so that it can be performed. (3) In the above embodiment, the scroll type work W is illustrated, but the present invention can also be applied to a chuck used for processing various types of irregularly shaped works, such as cams and cast products, whose outer diameter portions are not perfect circles. .

[0020]

As described above, according to the first aspect of the present invention, the position of the gripping claw can be adjusted in the radial direction of the chuck by a simple operation of simply rotating the eccentric collar, so that the centering operation can be performed. This has the effect of being easier.

According to the second aspect of the present invention, since the gripping claws are swingably provided, the plurality of gripping portions of the gripping claws can be reliably brought into contact with the outer peripheral surface of the deformed work. Adjusting the swing range of the gripping claws has an effect of preventing interference between the workpiece and the gripping claws.

According to the third aspect of the present invention, since the gripping portions are arranged on the spiral curve, there is an effect that the scroll-type work can be reliably gripped by each portion in the circumferential direction.

According to the fourth aspect of the present invention, since the member for positioning the work around the chuck axis is provided, there is an effect that the centering operation of the gripping claws can be omitted in the continuous processing of the same work.

According to the fifth aspect of the present invention, the member for receiving the work in a plane perpendicular to the chuck axis is provided.
There is an effect that the work can be mounted at an accurate position in the chuck axis direction.

[Brief description of the drawings]

FIG. 1 is a front view of a chuck showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an explanatory view showing a centering action of a gripping claw in the chuck of FIG. 1;

FIG. 5 is a front view showing a conventional chuck.

[Explanation of symbols]

1. Chuck body, 2. Claw support, 7. Grip claw,
8 ·· Grip, 9 ·· Stopper, 10 ·· Receiving member, 1
3 ··· Support shaft, 16 ··· Adjust bolt, 19 · · · Fitting hole, 20 · · · Eccentric collar, 25 · · · Positioning member, 28
Block, 30 Projection, 31 Adjust bolt, W Work, Wa Scroll part.

Claims (5)

[Claims] 1. A chuck in which a plurality of claw supports are provided on a chuck main body so as to be movable in a radial direction of a chuck, and grippers for gripping a work are attached to a front surface of each claw support. Providing a support shaft parallel to the chuck axis on one of them, forming a fitting hole with a larger diameter than the support shaft on the other, and rotatively interposing an eccentric collar between the fitting hole and the support shaft, A chuck in which the position of the gripping claw can be adjusted in the chuck radial direction with respect to the claw support by rotating the eccentric collar. 2. The chuck according to claim 1, wherein a plurality of grip portions are formed on the grip claw, the grip claw is provided so as to be swingable around the axis of the support shaft, and a member for adjusting a swing range of the grip claw is provided. . 3. The chuck according to claim 2, wherein the grips are arranged along a spiral curve. 4. The chuck according to claim 1, wherein a member for positioning the work around the chuck axis is provided on the front surface of the chuck body so as to be adjustable. 5. The chuck according to claim 1, wherein a member for receiving the workpiece in a plane perpendicular to the chuck axis is provided on a front surface of the gripping claw.