JP3126538B2 - Work fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work fixing device using a collet chuck, and can be used, for example, as a fixing device for fixing a wheel (work) to an automatic wheel runout inspection machine.

[0002]

2. Description of the Related Art Conventionally, in an automatic run-out tester for a wheel (automobile wheel), a wheel 1 is fixed to a rotary table (spindle head) 3 by a collet chuck 2 as shown in FIG. Are rotated together to measure the runout accuracy.

In fixing the wheel 1 to an inspection machine,
When the cylinder rod 4 is pulled through an air cylinder built in the main shaft, the collet chuck 2 is pressed against the tapered cone 5, the split skirt portion of the collet chuck 2 opens, and the hub hole of the wheel 1 is fixed. Current,
The fastening of the collet chuck 2 to the cylinder rod 4 is manually performed by a nut 6.

[0004]

However, since the positioning and fixing of the collet chuck are manually performed with nuts, the setting of the collet chuck to and from the main shaft cannot be automated.

[0005] It is an object of the present invention to provide a work fixing device capable of automatically attaching and detaching a collet chuck to and from a cylinder rod.

[0006]

A work mounting apparatus according to the present invention for achieving the above object comprises the following apparatus.
That is, a taper cone, a cylinder rod which is axially movable with respect to the taper cone and has a circumferentially cut groove on the outer periphery, and a cylinder lock
A collet chuck that is detachably mounted in the groove of the de by and out possible ball, the collet chuck Shirindaro
The collet chuck slides on the taper cone in the axial direction to remove the radius.
An inner cylinder having a ball holding hole slidable on the outer periphery of the cylinder rod and extending upwardly from the skirt and having a ball holding hole; a spring seat fixed to an upper end of the inner cylinder ; Ball pushing position and baud in the axial direction with respect to the cylinder
Slidable between the push-release position and the inner circumference
It has a tapered portion and a claw that protrudes radially outward on the outer circumference
An outer cylinder, a spring interposed between the spring seat and the outer cylinder, and held in the ball holding hole;
When the outer cylinder is pushed to the ball pushing position
Part of the inner cylinder is pushed by the small diameter part of the tapered part of the outer cylinder.
Projects inward from the inner peripheral surface and enters the groove of the cylinder rod
Lock the cylinder rod and inner cylinder in the axial direction
When the cylinder is lifted to the ball release position, from the inner circumference
Some parts are pushed by parts other than the groove of the cylinder rod
Projecting into the gap between the outer peripheral surface of the inner cylinder and the large diameter part of the outer cylinder taper
Release the lock between the extension cylinder rod and the inner cylinder.
Le and are composed of, the detachable device, in plan view
U-shaped U-shaped frame engageable with the claws of the outer cylinder from below
While holding the spring seat on the horizontal table
Move the frame up and down to push the outer cylinder against the inner cylinder
And move it up and down between the
A first system for attaching and detaching the chuck to the cylinder rod
Move the horizontal table up and down with the cylinder and collet chuck.
The second is to move the cylinder vertically with respect to the cylinder rod.
Cylinder and the second cylinder
Cable between the cylinder rod and the cylinder rod.
Rotate horizontally between positions that are off the top
A work fixing device, comprising:

[0007]

In the above device, when the outer cylinder is lifted toward the spring seat against the urging force of the spring, the pressing of the ball by the outer cylinder is released. When the collet chuck is pulled up from the cylinder rod in this state, the ball is pushed in the direction of coming out of the groove by the groove surface, the ball and the groove are disengaged, and the collet chuck together with the ball comes off the cylinder rod. The collet chuck is moved to another position from above the cylinder rod.

When another collet chuck is to be mounted, the collet chuck is mounted on the cylinder rod in the reverse procedure. When the lifting of the outer cylinder is released, the outer cylinder descends with respect to the inner cylinder by a spring force, and pushes the ball in the groove direction to enter the groove and press the ball from the outside. Therefore, the collet chuck and the cylinder rod are engaged via the ball. When the air cylinder is operated and the cylinder rod is pulled, the collet chuck is also lowered, and the skirt of the collet chuck is radially expanded by the tapered cone, and the wheel is fixed by the hub hole. In this state, the rotary table is rotated, the wheel is rotated, and the run-out of the wheel is measured.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. As shown in FIG. 2, the work fixing device includes a tapered cone 10 fixed to a rotary table and having a diameter which increases as it goes downward.
And the taper cone 10 extending through the taper cone 10
A cylinder rod 11 having a groove 12 which is movable in the axial direction with respect to the outer periphery and has a circumferentially extending groove on the outer circumference ; Collet chuck
And an attachment / detachment device for attaching / detaching the cylinder rod 11 to / from the cylinder rod 11 .

The collet chuck 14 is located halfway from the lower end.
A skirt 15 having a plurality of slits extending up to the position, and sliding on the tapered cone 10 to expand and contract in the radial direction;
An inner cylinder 16 formed integrally with the cylinder rod 11 and slidable in the axial direction on the outer periphery of the cylinder rod 11, a ball holding hole 17 formed in the inner cylinder 16, and the ball 13 held in the ball holding hole 17. A spring seat 18 fixed to the upper end of the inner cylinder 16, an outer cylinder 19 slidable in the axial direction on the inner cylinder 16 below the spring seat 18, and a spring seat 1.
And a spring 20 interposed between the outer cylinder 8 and the outer cylinder 19 to bias the outer cylinder 19 downward.

3 to 5 show the operation of the collet chuck 14. FIG. As shown in FIG. 3, the outer cylinder 19 is pushed down by the force of the spring 20, and the tapered portion 19a of the outer cylinder 19 is formed.
The small diameter portion pushes the ball 13 inward. The outer cylinder is pushed
When the ball is lowered and the ball is pushed in,
The position is referred to as a ball pressing position. The pushed ball 13 partially fits into the groove 12 of the cylinder rod 11, and the inner cylinder 16 and the cylinder rod 11 are locked in the axial direction.

As shown in FIG. 4, when the outer cylinder 19 is lifted upward, the ball 13 is no longer pushed from the outer cylinder 19, and the ball 13 is pushed by the surface of the groove 12 of the cylinder rod 11 and pushed outward. And a part of the ball 13 is a tapered portion of the outer cylinder 19.
The ball 13 protrudes into the gap between the inner cylinder 19a and the inner cylinder 16.
, The lock between the cylinder rod 11 and the inner cylinder 16 is released. The outer cylinder is pushed up and the large diameter of the tapered part of the outer cylinder
When the minute comes to the position corresponding to the ball, the ball push is released
The position of the outer cylinder with respect to the inner cylinder when the
It shall be. When the collet chuck 14 is further lifted in this state, as shown in FIG.
The whole 4 comes off the cylinder rod 11 and rises.

FIGS. 6 to 8 show the collet chuck 14 described above.
And an attachment / detachment device for attaching / detaching the cylinder rod 11 to / from the cylinder rod 11. FIG. 6 shows the U frame 21 of the detachable device.
Shows a state in which is engaged with the claw 19b of the outer cylinder 19. In this state, the spring seat 18 is
When the first cylinder 22 in FIG. 7 is pulled down from above, the lever 23 rotates about the fulcrum 24, the U frame 21 rises, and the outer cylinder 19 at the ball pushing position pushes the spring 20. Shrink and rise to the ball release position ,
The collet chuck 14 comes off the cylinder rod 11. Furthermore, horizontal table the second cylinder 28 is increased
Of the taper cone 10 and the collet chuck 14
And the cylinder rod 11 .

Subsequently, as shown in FIG. 8, the rotary table 26 is rotated around the fulcrum 27 by the third cylinder 25, and the collet chuck 14 is carried out of the machine. continue,
The second cylinder 28 shown in FIG. 7 is lowered, and the collet chuck 14 is removed by external setup. Collet chuck 14
When mounting is performed, reverse the above procedure. Then, after attaching the collet chuck 14 to the cylinder rod 11,
The rotary table 26 is rotated by the third cylinder 25 , and U
The frame 21 is removed from the collet chuck 14. The frame is U-shaped and comes off.

[0015]

According to the present invention, the collet chuck is engaged with the cylinder rod via the ball by partially pushing the ball into the groove of the cylinder rod with the outer cylinder urged by the spring. The collet chuck can be removed from the cylinder rod by lifting the ball against the spring to disengage the ball, so that the collet chuck exchange, which has been a neck, can be automated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a conventional work fixing device using a collet chuck.

FIG. 2 is a sectional view of a work fixing device according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a portion near a ball in a state where a collet chuck is locked to a cylinder rod in the apparatus of FIG. 2;

FIG. 4 is an enlarged cross-sectional view of a portion near a ball in a state where a lock of a collet chuck to a cylinder rod is released in the apparatus of FIG. 2;

FIG. 5 is an enlarged cross-sectional view of the vicinity of a ball in a state where a collet chuck comes off a cylinder rod in the apparatus of FIG. 2;

6 is a cross-sectional view of the vicinity of a collet chuck of the attaching / detaching device for attaching / detaching the work fixing device of FIG.

FIG. 7 is a side view of the attaching / detaching device of FIG. 6;

FIG. 8 is a plan view of the attaching / detaching device of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Taper cone 11 Cylinder rod 12 Groove 13 Ball 14 Collet chuck 15 Bottom part 16 Inner cylinder 17 Ball holding hole 18 Spring seat 19 Outer cylinder 19a Taper part 19b Claw 20 Spring 21 U frame 22 First cylinder 23 Lever 24 Support point 25 Third Cylinder 26 rotary table 27 fulcrum 28 second cylinder 29 horizontal table

Continuation of the front page (72) Inventor Mitsuru Ito 5-9, Yonbancho, Chiyoda-ku, Tokyo Topy Industries, Ltd. References JP-A-3-39633 (JP, A) JP-A-2-203021 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01M 1/02-1/28 G01M 17/00-17/10 B23B 31/20

Claims (1)

(57) [Claims] 1. A taper cone, a cylinder rod having an axially movable groove with respect to the taper cone and having a circumferentially cut groove on the outer periphery, and a bore capable of entering and exiting the cylinder rod groove with the cylinder rod. Collet chuck detachably mounted by the
The collet chuck slides axially on the tapered cone to expand and contract in the radial direction.
A skirt portion extending upward from the skirt portion and slidable on the outer periphery of the cylinder rod and having a ball holding hole; a spring seat fixed to an upper end portion of the inner cylinder; The ball pressing position and ball pressing in the axial direction
Slidable between the release position and tapered inside
An outer cylinder having a portion and having a claw protruding radially outward on an outer periphery; a spring interposed between the spring seat and the outer cylinder; and a ball held by the ball holding hole, wherein the outer cylinder is a ball. Push position
When pressed down, the tapered portion of the outer cylinder is
Part of the inner cylinder is pushed inward from the inner peripheral surface by being pushed by the small diameter part.
Into the groove of the cylinder rod and
The inner cylinder is locked in the axial direction, and the outer cylinder releases the ball push.
When lifted to the position, the groove of the cylinder rod
Part of the inner cylinder and the outer cylinder
Cylinder rod protruding into the gap between the
Unlock the inner tube and the ball, are composed of, the detachable device, in plan view is engageable from below the claw of the outer cylinder in U-shaped U
U frame while holding the spring seat on the frame and horizontal table
Move the outer cylinder up and down to move the outer cylinder to the ball
Move it up and down between the ball
The first syringe for attaching and detaching the chuck to the cylinder rod
Move the horizontal table up and down to syringe the collet chuck.
A second cylinder that moves vertically with respect to the rod
And the second cylinder is attached.
Detached from above the rod and from above the cylinder rod
Rotating tape that rotates horizontally between positions
Le and, and a, the workpiece fixing device.