JPH11188514A - Chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detach a chuck main body attached to a body to be attached by fastening. SOLUTION: Elongated holes 33 each through which a chuck attaching bolt 34 is to be inserted are circumferentially provided on an attaching part 32 of a chuck body 9 for constituting a chuck main body at equal distances. A cover (slip preventing part) 36 for preventing the attaching bolt 34 from slipping off in the chuck rotational axis direction is attached to the front surface of the attaching part 32. The chuck main body is attached to a chuck adapter (a body to be attached) 2 by fastening the attaching bolt 34. A tapered projecting part 12 and a tapered recessed part 6 are engaged with each other in this attaching state. When the chuck main body is detached, the head part of the attaching bolt 34 is brought into contact with the cover 36 by loosening the attaching bolt 34, the chuck main body is jacked from the chuck adapter 2, and therefore, the detachment is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck in which a chuck main body is fastened to an object to be mounted, and more particularly, to a case where a chuck mounting bolt provided on the chuck main body is loosened to remove the chuck main body. The present invention relates to a chuck capable of easily separating a chuck main body from an attached body.

[0002]

2. Description of the Related Art A conventional chuck will be described with reference to FIG. The chuck body 1 is connected to a main shaft 3 of a lathe through an attached body 2.
It can be attached to. The chuck body 1 is attached to the attachment body 2 by a tapered recess 6 provided on the front surface of the chuck adapter 2 which is an attachment body which is screwed to the main shaft 3 of the lathe with a bolt 4. The chuck body 1 is inserted into the bolt insertion hole 33 of the attachment part 32 of the chuck body 1 in a state where the tapered convex part 12 at the rear part of the mandrel body 7 projecting from the chuck body 1 is fitted and the rear surface of the chuck body 1 is in contact with the front surface of the chuck adapter 2. The chuck body 1 is attached to the chuck adapter 2 by tightening the chuck mounting bolts 34.

[0003]

In the conventional chuck, when the chuck body is mounted on the chuck adapter by tightening the mounting bolts, the tapered concave portion and the tapered convex portion bite each other, and when the chuck is replaced. In addition, the chuck body could not be quickly removed, and the efficiency of setup change was poor. Also, since the chuck body is biting,
A large force was required to remove the chuck body. An object of the present invention is to make it possible to easily remove a chuck main body attached to an attached body.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a chuck in which a chuck body is fastened to a body to be mounted by means of a chuck mounting bolt. A jack bolt that restricts movement of the chuck in the axial direction is rotatably provided (claim 1). Further, the chuck mounting bolt is a jack bolt (claim 2).

More specifically, the chuck body is provided with a retaining portion for preventing the head of the jack bolt inserted into the jack bolt insertion hole from moving in the exit direction. ). In addition, the chuck body has an accommodation hole for accommodating the head of the jack bolt, a cover that covers a part of the accommodation hole is provided, and the cover prevents the head of the jack bolt from moving in the exit direction. A part is configured (claim 4).

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. The chuck is a collet chuck that holds the inner diameter of the work W with a collet 11, and the chuck main body 1 is fixed to a main shaft 3 of a lathe as a cutting machine via a chuck adapter 2 as an attached body. The chuck adapter 2 is fixed to the main shaft 3 of the lathe with bolts 4 and has a tapered recess 6 formed on the front surface. The chuck body 1 includes a mandrel body 7 and a work locator 8.
, Chuck body 9, plunger 10, and collet 11
It is composed of

The mandrel body 7 is formed of a tapered convex portion 12 fitted into the tapered concave portion 6 of the chuck adapter 2 and a cylindrical portion 13 projecting forward from the center of the tapered convex portion 12. The tip of the cylindrical portion 13 has a tapered surface 14
Is formed. The mandrel body 7 has a tapered projection 12 connected to the rear surface of the chuck body 9 by bolts 16, and a cylindrical portion 13 inserted through the chuck body 9 and attached to the front surface of the chuck body 9 by bolts 18 for seating a workpiece. Through the work locator 8. A collet 11 for gripping the inner diameter of the work W is slidably fitted on the outer periphery of the cylindrical portion 13 of the mandrel body 7, and a guide hole 19 is provided on the rear side of the mandrel body 7. A small diameter shaft portion 20 at the front of the plunger 10 is slidably inserted.

The collet 11 comprises a grip 21 for gripping the inner diameter of the work W at the front end, a flange 22 at the rear end, and an intermediate thin portion 23, and the grip 21 and the thin portion 23 are cut into a plurality. . The inner peripheral surface of the grip portion 21 is formed as a tapered circular surface 24 slidable with the tapered surface 14 at the tip of the mandrel body 7. A center hole 25 is provided at the center of the flange portion 22 so as to be slidably guided on the outer peripheral surface of the cylindrical portion 13 of the mandrel body 7.
Is connected to a connecting portion 26 of the plunger 10 by a bolt 28 via a spacer 27 penetrating the tapered projection 12.

A large-diameter shaft portion 29 projects from the rear center of the plunger 10, and passes through the center hole 15 of the chuck adapter 2. A plurality of hooking pieces 30 are formed on the inner periphery of the large-diameter shaft portion 29, and the tip of a connecting rod 31 inserted into the main shaft 3 is engaged with the hooking pieces 30, and a plunger is inserted through the connecting rod 31. 10 is connected to a rotating cylinder (not shown). The plunger 10 is moved by the action of the rotating cylinder to the collet 11.
When the plunger 10 is retracted, the grip portion 21 is expanded by the tapered surface 14 against the elasticity of the thin portion 23 to center the workpiece W, and when advanced, the thin portion 23 is moved. The grip 21 is closed and the work W is opened by the elasticity of the work. A spring 17 is provided between the mandrel body 7 and the plunger 10 to urge the plunger 10 rearward with respect to the mandrel body 7 and to urge the grip portion 21 in the expanding direction (work grip direction). It is interposed.

As shown in FIG. 2, three arc-shaped long holes 33 are formed in the mounting portion 32 of the chuck body 9 at equal angles in the circumferential direction. These long holes 33 are chuck mounting bolt insertion holes through which the chuck mounting bolts 34 also serving as jack bolts are rotatably inserted, and can accommodate the heads of the chuck mounting bolts 34. And a narrow portion 33b slightly larger than the thread diameter of the chuck mounting bolt 34. One end of the narrow portion 33b is large enough to fit the head of the chuck mounting bolt 34. It is formed at the radial end 33c. The large-diameter end 33c is fitted into the head of a chuck mounting bolt 34 screwed to the chuck adapter 2 when the chuck body 1 is mounted on the chuck adapter 2.
The chuck body 1 is rotated to position the other end 33d of the other end on the threaded portion of the chuck mounting bolt 34, and in this state, the chuck mounting bolt 34 is tightened.
Are attached to the chuck adapter 2 at a predetermined phase around the rotation axis. In this mounting state, the wide portion 33a on the opposite end 33d side becomes a housing hole for housing the head of the chuck mounting bolt 34. On the front surface of the mounting portion 32, a cover 3 serving as a retaining portion for preventing the chuck mounting bolt 34 from coming out in the pulling-out direction (the same direction as the chuck rotation axis direction).
6 is fixed by screws 37. The cover 36 is formed with three through holes 38 which are narrower than the head of the chuck mounting bolt 34 and slightly larger than the maximum diameter of the hexagonal hole of the chuck mounting bolt 34 so as to overlap the elongated hole 33. A tool T such as a wrench is inserted from 38 and the chuck mounting bolt 34 is operated.

On the front of the work locator 8 is a seating confirmation hole 3.
9 are formed at equal intervals in the circumferential direction. The seating confirmation hole 39 communicates with the air passage 40 of the work locator 8, the air passage 41 of the chuck body 9, and the air passage 42 of the chuck adapter 2, and the air passage 42 is illustrated via the air passage 43 of the main shaft 3. The seating of the workpiece W is confirmed by the air circuit detecting means. The communication hole 44 of the air passage 42 on the chuck body 1 side is attached to the chuck adapter 2 at a position where the chuck body 1 is shifted from a predetermined phase (a position shifted leftward from the mounting state in FIG. 2). The air escapes to the outside air by communicating with the long holes 33. Even if the work W is seated in this state, the seating is not confirmed by the detecting means, and the chuck mounting abnormality can be confirmed. .

When the chuck body 1 is removed from the chuck adapter 2 when replacing the chuck, the chuck mounting bolt 34 becomes a jack bolt, and the chuck mounting bolt 34 is loosened with the tool T inserted through the through hole 38 as shown in FIG. Then, with the head of the chuck mounting bolt 34 in contact with the cover 36, the chuck body 1 is jacked up from the chuck adapter 2, and the tapered convex portion 12 is separated from the tapered concave portion 6. Then, when the tapered convex portion 12 is separated from the tapered concave portion 6, the chuck body 1 is rotated in the opposite direction to that when the chuck body 1 is attached to the chuck adapter 2, and the large-diameter end 33c is removed from the chuck mounting bolt 34 to remove the chuck body. 1 is removed from the chuck adapter 2. By loosening the chuck mounting bolt 34 in this manner, the chuck main body 1 is moved from the chuck adapter 2 by moving the chuck mounting bolt 34 in the chuck rotation axis direction in a state where the head of the chuck mounting bolt 34 is in contact with the cover 36. Since the jack body is jacked up and separated from the chuck adapter 2, even if the chuck body 1 bites into the chuck adapter 2, the chuck body 1 can be easily removed from the chuck adapter 2 with a small force.

Next, another embodiment will be described. The same parts as those of the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 4, a bolt insertion hole 45 that opens in the chuck radial direction is formed in the attachment portion 32 of the chuck body 9, and the bolt insertion hole 45 is formed with a U-shaped bolt head receiving hole 45a and a U-shaped screw portion. It is formed from the accommodation hole 45b, and the chuck mounting bolt 34 is inserted from the chuck radial direction. A retaining portion 46 is formed integrally with the chuck body 9 in the direction of the chuck rotation axis of the bolt insertion hole 45. The retaining portion 46 has a diameter smaller than the head diameter of the chuck mounting bolt 34 and slightly larger than the maximum diameter of the hexagonal hole. A bolt operation hole (through hole) 47 is formed. When the chuck is replaced, when the tool T is inserted through the bolt operation hole 47 and the chuck mounting bolt 34 is loosened, the chuck mounting bolt 34 is held in a state where the head of the chuck mounting bolt 34 contacts the retaining portion 46. Move to the right in FIG. 4, and the chuck body 1 is jacked up from the chuck adapter 2, so that the chuck body 1 can be easily removed.

Although the head of the chuck mounting bolt is accommodated in the housing hole of the insertion hole, if the movement of the chuck mounting bolt in the axial direction is restricted by the retaining portion, the head is inserted into the insertion hole. May protrude from. Although the chuck mounting bolt and the jack bolt are the same, a jack bolt may be provided separately from the chuck mounting bolt. Further, the present invention is not limited to a chuck of a type for grasping the inner diameter of a work, but can be applied to various types of chucks such as a three-jaw chuck and a finger chuck for grasping the outer shape. 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.

[0015]

As described above, according to the present invention, the chuck body is provided with the jack bolt which restricts the movement in the chuck rotation axis direction, so that the chuck body can be jacked up by the rotation of the jack bolt, and the chuck body can be separated from the attached body. The chuck body can be easily removed with a small force even when the chuck body and the attached body bite, the chuck can be quickly replaced, and the efficiency of setup change can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a chuck.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partial cross-sectional view of FIG. 1 showing an operation of a chuck mounting bolt.

FIG. 4 is another embodiment.

[Explanation of symbols]

1 chuck main body 2 chuck adapter (substrate to be attached) 32 mounting part 34 chuck mounting bolt (jack bolt) 33, 45 chuck mounting bolt insertion hole (jack bolt insertion hole) 36, 46 retaining part

Claims (4)

[Claims] 1. A chuck in which a chuck body is fastened to a body to be mounted by means of a chuck mounting bolt, wherein a jack bolt restricting movement of the chuck in an axial direction is rotatable on a mounting portion of the chuck body. A chuck characterized by being provided. 2. The chuck according to claim 1, wherein the chuck mounting bolt is a jack bolt. 3. The chuck body according to claim 1, wherein the chuck main body is provided with a retaining portion for preventing a head of the jack bolt inserted into the jack bolt insertion hole from moving in a pulling-out direction. Chuck. 4. A chuck body is provided with an accommodation hole for accommodating a head of a jack bolt, a cover for covering a part of the accommodation hole is provided, and the cover prevents the head of the jack bolt from moving in a withdrawing direction. 4. A chuck according to claim 3, wherein a retaining portion for preventing the chuck is provided.