JPH06281525A - Work fixer - Google Patents

Abstract

PURPOSE:To automatically detachably mount a collet chuck for fixing a work on a cylinder rod. CONSTITUTION:A work fixer is comprised in that a collet chuck 14 for fixing a work and a cylinder rod 11 are detachably mounted through balls 13, an outer cylinder 19 for pushing the balls 13 into a groove 12 of the cylinder rod 11 is energized with a spring 20, the collet chuck 14 and the cylinder rod 11 are automatically locked by energization of the spring 20 and when they are detached, the outer cylinder 19 is lifted against the energization of the spring 20.

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 a wheel automatic shake inspection machine.

[0002]

2. Description of the Related Art Conventionally, in an automatic shake inspection machine for a wheel (automobile wheel), as shown in FIG. 1, a wheel 1 is fixed to a rotary table (spindle head) 3 by a collet chuck 2, and the rotary table 3 and the wheel 1 are fixed. Rotate together to measure the runout accuracy.

In fixing the wheel 1 to the inspection machine,
By pulling the cylinder rod 4 through an air cylinder built in the main shaft, the collet chuck 2 is pressed against the taper cone 5, the split hem of the collet chuck 2 is opened, and the hub hole of the wheel 1 is fixed. Current,
A person uses a nut 6 to fasten the collet chuck 2 to the cylinder rod 4.

[0004]

However, since the collet chuck is positioned and fixed by manual nut fastening, it is not possible to automate the setup for attaching and detaching the collet chuck to and from the spindle.

An object of the present invention is 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 device according to the present invention for achieving the above object comprises the following devices.
That is, it is composed of a taper cone, a cylinder rod that is movable in the axial direction with respect to the taper cone and has a groove cut in the circumferential direction on the outer periphery, and a collet chuck that is detachably mounted on the cylinder rod by a ball. , The collet chuck is slidable on the outer periphery of the cylinder rod and has an inner cylinder having a ball holding hole; a ball held in the ball holding hole; a spring seat fixed to the inner cylinder; A workpiece fixing device comprising an outer cylinder slidable in the axial direction with respect to the cylinder, and a spring interposed between the spring seat and the outer cylinder.

[0007]

In the above device, when the outer cylinder is lifted in the direction of the spring seat against the biasing force of the spring, the pressing of the ball by the outer cylinder is released. When the collet chuck is pulled upward from the cylinder rod in this state, the ball is pushed by the groove surface in the direction to come out of the groove, the engagement between the ball and the groove is released, and the collet chuck is released from the cylinder rod together with the ball. Move the collet chuck from above the cylinder rod to another position.

If another collet chuck is to be attached, it is attached to the cylinder rod in the reverse order of the above. When the lifting of the outer cylinder is released, the outer cylinder descends with respect to the inner cylinder by the spring force, pushes the ball in the groove direction, thrusts the ball into the groove, and presses it from the outside. Therefore, the collet chuck and the cylinder rod are engaged with each other via the ball. When the air cylinder is operated and the cylinder rod is pulled, the collet chuck also descends, the skirt of the collet chuck is radially expanded by the taper cone, and the wheel is fixed in the hub hole. In this state, the rotary table is rotated, the wheel is rotated, and the shake of the wheel is measured.

[0009]

The preferred embodiments of the present invention will be described below. As shown in FIG. 2, the work fixing device includes a taper cone 10 that is fixed to a rotary table and expands in diameter downward.
And the taper cone 10 extends through the taper cone 10.
A cylinder rod 11 which is axially movable and has a groove 12 extending in the circumferential direction on the outer circumference, and a collet chuck 14 which is detachably mounted on the cylinder rod 11 by engagement of the ball 13 and the groove 12. Have.

The collet chuck 14 includes a taper cone 1
A skirt portion 15 which is slid to 0 and expands and contracts, an inner cylinder 16 which is formed integrally with the skirt portion 15 and is slidable in the axial direction on the outer periphery of the cylinder rod 11, and is formed in the inner cylinder 16. Ball holding hole 17, the ball 13 held in the ball holding hole 17, a spring seat 18 fixed to the upper end of the inner cylinder 16, and an axial slide on the inner cylinder 16 below the spring seat 18. The outer cylinder 19 is made possible and a spring 20 is interposed between the spring seat 18 and the outer cylinder 19 to urge the outer cylinder 19 downward.

3-5 illustrate the operation of the collet chuck 14. As shown in FIG. 3, the outer cylinder 19 is pushed down by the force of the spring 20, and the taper portion 19 a of the outer cylinder 19 is pushed down.
Pushes the ball 13 inward. The pushed ball 13 partially fits in the groove 12 of the cylinder rod 11, and the inner cylinder 16 and the cylinder rod 11 are axially locked.

As shown in FIG. 4, when the outer cylinder 19 is lifted upward, the ball 13 is no longer pushed by the outer cylinder 19, and the ball 13 is pushed by the surface of the groove 12 of the cylinder rod 11 and is pushed outward. , The lock of the cylinder rod 11 and the outer cylinder 19 by the ball 13 is released. When the collet chuck 14 is further lifted in this state, the entire collet chuck 14 separates from the cylinder rod 11 and is lifted as shown in FIG.

FIGS. 6-8 show the collet chuck 14 described above.
The attachment / detachment device for attaching / detaching to / from the cylinder rod 11 is shown together with its operation. FIG. 6 shows the U frame 21 of the attachment / detachment device.
Shows the state of being engaged with the claw 19b of the outer cylinder 19. In this state, pulling the cylinder 22 shown in FIG.
The lever 23 rotates around the center, the U frame 21 lifts up, and the outer cylinder 19 contracts the spring 20 and lifts up.
The collet chuck 14 is disengaged from the cylinder rod 11. Further, the cylinder 28 is raised to separate the collet chuck 14 from the tapered cone.

Subsequently, as shown in FIG.
The table 26 is rotated around the fulcrum 27 and the collet chuck 14 is carried out of the machine. Subsequently, the cylinder 28 shown in FIG. 7 is lowered, and the collet chuck 14 is removed by external setup. When the collet chuck 14 is mounted, the procedure is reversed. Then, after the collet chuck 14 is attached to the cylinder rod 11, the cylinder 25 is rotated on the table 26 to remove the U frame 21 from the collet chuck 14. Since the frame is U-shaped, it comes off.

[0015]

According to the present invention, by partially pushing the ball into the groove of the cylinder rod by the outer cylinder urged by the spring, the collet chuck is engaged with the cylinder rod via the ball, and the outer cylinder is engaged. Since the collet chuck can be disengaged from the cylinder rod by lifting it up against the spring to disengage the ball, it is possible to automate the replacement of the collet chuck, which has been a neck until now.

[Brief description of 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.

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

FIG. 4 is an enlarged cross-sectional view of the vicinity of the ball in a state where the collet chuck is unlocked from the cylinder rod in the apparatus shown in FIG.

5 is an enlarged cross-sectional view of the vicinity of the ball in a state where the collet chuck is detached from the cylinder rod in the apparatus of FIG.

FIG. 6 is a cross-sectional view in the vicinity of a collet chuck of an 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.

8 is a plan view of the attachment / detachment device of FIG. 7. FIG.

[Explanation of symbols]

 10 Tapered Cone 11 Cylinder Rod 12 Groove 13 Ball 14 Collet Chuck 15 Bottom 16 Inner Cylinder 17 Ball Holding Hole 18 Spring Seat 19 Outer Cylinder 19a Tapered Part 19b Claw 20 Spring 21 U Frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Ito 5-5, 4th-cho, Chiyoda-ku, Tokyo Within Topy Industries Co., Ltd. (72) Inventor Takeshi Muto 5-5th, 4th-cho, Chiyoda-ku, Tokyo Topy Corporation Within the corporation

Claims (1)

[Claims] 1. A taper cone, a cylinder rod which is axially movable with respect to the taper cone and has a groove formed in the outer periphery in the circumferential direction, and a collet chuck which is detachably mounted on the cylinder rod by a ball. And an inner cylinder having a ball holding hole slidable on the outer periphery of the cylinder rod, a ball held in the ball holding hole, and a spring seat fixed to the inner cylinder. A work fixing device comprising: an outer cylinder axially slidable with respect to the inner cylinder; and a spring interposed between the spring seat and the outer cylinder.