JPH11114706A - Chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically confirm the abnormal chucking of a chuck by means of simple structure utilizing a mechanism for confirming the seating of a work. SOLUTION: One end of an oval hole 29 is positioned to a bolt 3 screwed to a base plate 2, while a chuck main body l is installed in a prescribed phase around an axis of rotation. When the chuck main body 1 is installed in the prescribed phase, since an air passage 35 of the chuck main body l is communicated with a connecting port 38a of a supply passage, the air for confirming the proper seating of the work is led to an air discharging port 34 that is provided in front of the chuck main body 1. When the chuck main body 1 is installed in a phase deviated from the prescribed one, since the air for confirming the proper seating of the work leaks to the outside air through the oval hole 29, the proper seating of the work cannot be confirmed, so that the rotation of the chuck will not be allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck mounting structure used for turning.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a bolt 52 is screwed onto a base plate 51 fixed to a main shaft of a processing machine, and a long hole 54 is formed in a flange portion 53a of a chuck body 53. Is fitted to the bolt 52,
A technique is known in which the chuck body 53 is rotated to position one end 54b of the elongated hole 54 on the bolt 52, and the bolt 52 is tightened in this state to attach the chuck body 53 to the base plate 51 at a predetermined phase around the rotation axis. I have.

[0003]

However, according to the conventional chuck, the mounting phase of the chuck main body 53 is confirmed by the touch when one end 54b of the long hole 54 comes into contact with the bolt 52. The chuck body 53 may be mounted in an incorrect phase when the cutting chips are clogged, and in such a case, there is a possibility that the hook between the claw opening / closing member of the chuck and the connecting rod on the spindle side becomes insufficient. there were.

It is an object of the present invention to provide a chuck which can automatically confirm a mounting abnormality with a simple structure.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a chuck body by positioning one end of an elongated hole provided in a chuck body to a bolt screwed to a mounting portion on a processing machine side. In a chuck mounted in a predetermined phase around the rotation axis, when the chuck body is mounted in a predetermined phase, an air passage for guiding seating confirmation air supplied from the mounting portion side to a work joining portion on the chuck main body side, and the chuck main body includes: An outside air communication passage is provided to allow the seating confirmation air to escape to the outside air when attached at a phase shifted from a predetermined phase (claim 1). According to this configuration, it is possible to automatically confirm the chuck mounting abnormality with a simple structure using the work seating confirmation mechanism.

Further, the chuck according to the present invention has a seating confirmation when the chuck main body is mounted at a phase shifted from a predetermined phase so that a mounting abnormality can be more easily confirmed by using the slot for mounting the chuck. It is configured such that air is released from the long hole to the outside air (claim 2).

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a chuck of a type for gripping the inner diameter of a work, and FIGS. 2 to 4 show a mounting structure of the chuck. As shown in FIG. 1, the chuck body 1 is mounted on a base plate 2 as a mounting portion with bolts 3, and the base plate 2 is fixed to a main shaft 4 of a lathe as a turning machine with bolts 5. A centering member 7 that fits into the tapered recess 6 of the base plate 2 is connected to the rear surface of the chuck body 1 with bolts 8, and a seat plate 9 on which the workpiece W is seated is connected to the front surface of the chuck body 1 with bolts 10. I have.

At the center of the centering member 7, a centering cylinder 12 protrudes forward, and a plurality of gripping claws 13 for gripping the inner diameter of the work W are arranged on the outer circumference of the centering cylinder 12. The gripping claw 13 is composed of a gripping portion 13a at the front end, a flange portion 13b at the rear end, and an intermediate thin portion 13c, and the inner peripheral surface of the gripping portion 13a is engaged with the tapered end surface 14 of the centering cylinder 12. . On the rear side of the centering member 7, a claw opening / closing member 15 is disposed.
5 is a flange portion 13b of the gripping claw 13 via a bolt 16 and a spacer 17 penetrating the centering member 7 at three places.
It is connected to. A pair of front and rear shaft portions 19 and 20 project from the center of the claw opening and closing member 15, and the front shaft portion 19 is provided in the center hole 21 of the centering member 7, and the rear shaft portion 20 is provided in the center hole 22 of the base plate 2. Are slidably inserted into each of them.
The centering cylinder 12 and the gripping claws 13 constitute a known collet chuck.

A plurality of locking pieces 2 are provided on the inner periphery of the rear shaft portion 20.
The engaging piece 23 is engaged with the distal end 25 of a connecting rod 24 penetrating the main shaft 4, and the pawl opening / closing member 15 is connected to the rotating cylinder of the lathe through the rod 24.
(Not shown). Then, the claw opening / closing member 15 and the holding claw 13 are integrally retracted by the rotary cylinder, and the holding portion 13 a is expanded by the tapered surface 14 of the centering cylinder 12.
The work W is clamped to perform centering, the claw opening / closing member 15 and the gripping claw 13 are advanced, and the gripping portion 13a is closed by the elasticity of the thin portion 13c, thereby unclamping the work W. The centering member 7 and the claw opening / closing member 1
A spring 26 for urging the grip 13a in the expanding direction (work gripping direction) is interposed between the spring 5 and the spring 5.

As shown in FIG. 2, three arc-shaped long holes 29 are formed in the flange portion 28 of the chuck body 1 at equal angles. These long holes 29 include a wide portion 29A capable of accommodating the head of the bolt 3 and a bar-shaped narrow portion 29B, and the large-diameter end 29a of the narrow portion 29B is connected to the base plate 2.
And the chuck body 1 is rotated, and the opposite end 29b of the narrow portion 29B is positioned on the shaft portion of the bolt 3, and in this state, the bolt 3 is tightened. With a predetermined phase around the rotation axis.
It is designed to be attached to.

On the front surface of the flange portion 28, a ring plate 30 for retaining the bolt 3 is fixed with a screw 31. On this plate 30, three through holes 32 narrower than the head of the bolt 3 are formed. It is formed so as to overlap. Then, as shown in FIG. 4, the bolt 3 is loosened with a tool T such as a wrench inserted into the through hole 32, and the chuck body 1 is jacked up with the head of the bolt 3 abutting on the ring plate 30. Then, the centering member 7 is pulled out from the tapered recess 6, and the chuck body 1 is rotated in the direction of the arrow in FIG.
9, the large-diameter end 29a of the narrow portion 29B is detached from the bolt 3, and the chuck body 1 is detached from the base plate 2.

On the other hand, as shown in FIGS. 1 and 2, an air discharge hole 34 is formed on the front surface of the sheet plate 9, and air passages 35, 36 communicating with the discharge hole 34 are formed in the chuck body 1 and the sheet plate 9. Is provided and the base plate 2
Is formed with a supply passage 38 communicating with the air supply hole 37 of the main shaft 4. Then, when the chuck body 1 is correctly mounted in a predetermined phase (phase shown in FIG. 2),
The connection port 35a of the air passage 35 of the chuck body 1 communicates with the connection port 38a of the supply passage 38 of the base plate 2, and the seating confirmation air A supplied from the mounting portion side is guided to the air discharge hole 34 of the chuck body 1 side. It has become.

A narrow portion 29B of one long hole 29 is formed in the chuck body 1 at one end 29b at a phase slightly deviated from the connection port 35a of the air passage 35 by a predetermined angle θ. As shown, when the chuck main body 1 is erroneously attached at a phase shifted from a predetermined phase, an outside air communication path is formed to allow the seating confirmation air A to escape to the outside air. In FIG. 3, reference numeral 39 denotes an O-ring for sealing mounted on the connection port 38a of the supply passage 38 of the base plate 2.

According to the chuck configured as described above, when the chuck body 1 is mounted in a correct phase, the air A for seating confirmation is guided to the discharge hole 34 and the work W
The seat (not shown) provided in the chuck air circuit confirms that the is seated on the seat plate 9, and the chuck can be immediately rotated. On the other hand, when the chuck body 1 is mounted in the wrong phase, the seating confirmation air A escapes to the outside air through the elongated holes 29, so that the detector does not operate even when the workpiece W is seated, and the rotation of the chuck is not performed. Is blocked. Therefore, the operator can easily confirm the mounting abnormality, re-attach the chuck body 1 to the regular phase, and securely engage the claw opening / closing member 15 with the connecting rod 24,
In this state, the chuck can be safely rotated.

According to the chuck of this embodiment,
Since the chuck mounting abnormality is confirmed using the work W seating confirmation mechanism, there is no need to add a detector or circuit for confirming the mounting abnormality, and the chuck can be configured with a simple structure and multifunctional. it can. In addition, since the outside air communication passage is formed by using the long hole 29 for attaching the chuck, it is not necessary to separately form a hole or a passage for confirming an abnormality in the chuck body 1, thereby reducing the manufacturing cost. There is also an advantage that a reduction in rigidity of the chuck body 1 can be avoided.

FIGS. 5 to 7 show another embodiment of the chuck according to the present invention. In this chuck,
As shown in FIG. 5, an outside air communication groove 40 that allows the seating confirmation air A to escape to outside air is formed on the rear surface of the flange portion 28. As shown in FIG. 6, the outside air communication groove 40 is provided in a phase that does not overlap with the connection port 38a of the supply passage 38 of the base plate 2 when the chuck body 1 is mounted in a predetermined phase. The seating confirmation air supplied from the side is guided to the air discharge hole 34 on the chuck body 1 side. On the other hand, when the chuck body 1 is mounted at a phase shifted from the predetermined phase, as shown in FIG. 7, the outside air communication groove 40 overlaps with the connection port 38a of the supply passage 38, and the air for seating confirmation is exposed to the outside air. Let go. Therefore, even with this configuration, it is possible to automatically check the chuck mounting abnormality with a simple structure using the work seating confirmation mechanism.

The present invention is not limited to a chuck of a type for gripping the inner diameter of a work, but may be any type such as a three-jaw chuck or finger chuck for gripping an outer diameter, or an electromagnetic chuck for suctioning an end face. Can be applied to the chuck. In addition, without departing from the spirit of the present invention, the shape and configuration of each part of the chuck can be appropriately changed and implemented.

[0018]

As described in detail above, according to the first aspect of the present invention, when the chuck body is mounted in a shifted phase, the outside air communication passage for releasing the seating confirmation air to the outside air is provided. With a simple structure using a workpiece seating confirmation mechanism, there is an effect that a chuck mounting abnormality can be automatically confirmed.

According to the second aspect of the present invention, the seating confirmation air is released to the outside air by using the long holes for attaching the chuck.
With a simple and inexpensive structure, there is an effect that a chuck mounting abnormality can be automatically confirmed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (a cross-sectional view taken along line YY in FIG. 2) of a chuck according to an embodiment of the present invention.

FIG. 2 is a sectional view (FIG. 1) showing a mounting structure of the chuck shown in FIG.
XX line cross-section).

FIG. 3 is a sectional view showing the operation of the chuck of FIG.

FIG. 4 is a partial cross-sectional view of FIG. 1 showing an operation of a chuck mounting bolt.

FIG. 5 is a partial cross-sectional view of a chuck showing another embodiment of the present invention.

FIG. 6 is a sectional view showing a mounting structure of the chuck shown in FIG. 5;

FIG. 7 is a sectional view showing the operation of the chuck of FIG.

FIG. 8 is a front view showing a conventional chuck.

[Explanation of symbols]

1. chuck body, 2. base plate, 3. bolt, 4. spindle, 7. centering member, 9. sheet plate, 13. gripping claw, 15. claw opening / closing member, 24.
Connecting rod, 29 ··· long hole, 34 ··· air discharge hole, 35, 36 ··· air passage, 37 ··· air supply hole, 3
8. Supply passage, 40 ... outside air communication groove, A ... air for confirming seating, W ... work.

Claims (2)

[Claims] 1. A chuck for positioning one end of an elongated hole provided in a chuck body to a bolt screwed to a mounting portion on a processing machine side and mounting the chuck body at a predetermined phase around a rotation axis, wherein the chuck body has a predetermined phase. An air passage that guides the seating confirmation air supplied from the mounting portion side when attached to the work joining portion on the chuck body side, and a seating confirmation air when the chuck body is attached out of phase with a predetermined phase. A chuck provided with an outside air communication passage for releasing air. 2. A chuck in which one end of an elongated hole provided in a chuck body is positioned on a bolt screwed to a mounting portion on a processing machine side and the chuck body is mounted at a predetermined phase around a rotation axis. An air passage is provided to guide the seating confirmation air supplied from the mounting part side to the work joining part on the chuck body side when it is attached, and the seating confirmation air is provided when the chuck body is attached with a phase shifted from a predetermined phase. That is configured to allow air to escape from the long hole into the outside air.