JPH078475B2 - Chuck device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chuck device suitable for use as a work transfer device in a dynamic balance tester or the like.

[Prior Art] A chuck device, which is attached to a piston rod of a pneumatic cylinder via a bent link device and clamps or releases an object by expansion and contraction of the cylinder, is used in a transfer device such as a dynamic balance tester. ing. This chuck device has a pair of left and right chucks for gripping the left and right shafts of the work when the work is a rotor of a motor, for example, and both chucks are attached to the cylinder via a fixing member.

[Problems to be Solved by the Invention] However, in the above-described conventional chuck device, when there are variations in the left and right shaft diameters of the workpiece, for example, the right shaft diameter is
There are two types of 10 mm or 12 mm, and when the left shaft diameter is 17 mm constant, etc., there is a problem that one shaft can be correctly grasped but the other shaft cannot be properly grasped. To solve this problem, the left and right chucks may be driven by separate cylinders, but it is not preferable to provide the two cylinders in this way because the structure is complicated and the dimensions become large. It was

An object of the present invention is to enable objects having different diameters to be chucked correctly at the same time with one cylinder.

[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configurations.

That is, the chuck device according to the present invention includes a connecting shaft supported by a central shaft that moves up and down by a cylinder so as to be tiltable left and right in a seesaw manner, and a dry bearing mounted on both left and right sides of the connecting shaft via spherical bushes. A shaft member slidably supported to the left and right by means of a dry bearing of the shaft member, which is connected via a link, and the connecting shaft is moved downward to receive a force in the closing direction to hold an object. It is characterized by comprising a pair of chucks and a positioning device which is provided coaxially with the central axis and positions an object to be sandwiched with respect to the chuck.

[Operation] When the cylinder is extended, the central shaft and the connecting shaft move downward, and when the chuck reaches the level of the work, a force in the closing direction is applied to the chuck by the action of the link device to chuck the work. Since the connecting shaft is a seesaw type and can be tilted up and down, it tilts so that the smaller the diameter of the work becomes when it is pressed downward, and the closing operation of the chuck on that side becomes larger accordingly. Therefore, it is possible to correctly chuck a work having different diameters on the left and right. The left-right distance changes due to the seesaw-type tilt of the connecting shaft, but this change is absorbed by the lateral movement of the shaft member supported by the dry bearing, and the chuck interval does not change.

[Examples] Hereinafter, specific examples will be described with reference to the drawings.

In this chuck device 1, a plate 5 is horizontally fixed to a piston rod 3a of a cylinder 3 supported by a machine frame 2, and a central shaft 7 is attached to the central portion of the plate. In addition, guide rods 9, 9 are provided on both ends of the plate 5.
9 are attached, and both guide rods are slidably supported by a linear bearing in the vertical direction.

A connecting shaft 11 is attached to the upper part of the central shaft 7 through a spherical bush 10 so as to be tiltable in a seesaw manner. Connecting shaft 11
The left central shaft 4 and the right central shaft 15 are connected to the left and right ends of the shaft via spherical bushes 13, 13, respectively. These left and right central shafts (shaft members) 14 and 15 are dry bearings 17 and 17, respectively.
Is supported slidably to the left and right, and a chuck 20 is connected to the outside of the dry bearing 17 via a link 19. An intermediate portion of the chuck 20 is pivotally attached to a housing 21 supported by the central shaft 7 by a pin 22, and an upper end portion thereof is pivotally attached to the link 19 by a pin 23. At the lower end of the chuck 20, a recess 20a with which the shaft of the work engages is formed.

A sleeve 25 is slidably fitted to the lower end of the center shaft 7, and a notch 27 (positioning device) for positioning a work is attached to the sleeve. Further, a pin 29 attached to the sleeve 25 is slidably fitted in a vertical groove 7a formed in the central shaft 7. The notch 27 is formed hollow, and a spring 30 is provided inside the notch 27 so that the notch 27 can move in and out.

Next, the operation of the chuck device 1 will be described.
As shown in FIG. 4, when nothing is chucked,
The cylinder is contracted and the connecting shaft 11 is kept horizontal.
In this chuck device 1, the left and right axes a and b have different diameters (a
> B) When chucking the work W, the cylinder is extended to bring the notch 27 into contact with the work W as shown in FIG. At this time, the connecting shaft 11 tilts, and the link 19 of the smaller diameter chuck (right side in the figure) is pushed more, so that the chuck on that side is closed more and the small diameter shaft b is well chucked. King. On the contrary, when the shaft a on the opposite side is small, the connecting shaft 11 tilts downward to the left, and the left chuck is closed more. In this way, since the closing amount of the pair of left and right chucks is adjusted according to the work, it is possible to successfully grasp the work having different left and right diameters. When the connecting shaft 11 tilts, a difference occurs in the widthwise dimensions A and B in the drawing, but this difference is absorbed by the sliding in the dry bearing. Since the notch 27 moves in and out to some extent by the spring 30, the positioning is accurately performed.

Next, FIG. 6 shows an embodiment different from the above. In this embodiment, dry bearings 17 ', 17' for linear movement are provided at both ends of the connecting shaft 11, and the central shafts 14, 15 are provided.
The dry bearings 17 between the link 19 and the link 19 are bearings for rotation. That is, in this embodiment, the bearings of the rotary part and the linear motion part are separated, and the connecting shaft
A linear motion is performed between 11 and the spherical bushes 10 and 13.

[Advantages of the Invention] This chuck device can reliably chuck a work having a left and right diameter variation with a single cylinder, and since the size of the entire device does not need to be increased,
For example, when this is used in a transport device, the inertial weight of the contact transport device can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a part of an embodiment of the present invention in cross section, FIG. 2 is a side view with a part omitted, FIG. 3 is a side view thereof, and FIGS. Is an illustration of operation, No. 6
The figure is an illustration of a different embodiment. 3 …… Cylinder, 7 …… Center shaft 10,13 …… Bushing, 11 …… Coupling shaft 19 …… Link, 20 …… Chuck 27 …… Notch (positioning device)

Claims (1)

[Claims] 1. A connecting shaft, which is supported by a center shaft that moves up and down by a cylinder so as to be tiltable left and right in a seesaw manner, and mounted on both left and right sides of the connecting shaft via spherical bushes, and slides left and right by a dry bearing. A shaft member that is freely supported, and a pair of left and right chucks that are connected to the outside of a dry bearing of the shaft member via a link and that receive a force in the closing direction by the downward movement of the connecting shaft to hold an object. A chucking device comprising: a positioning device that is coaxial with the central axis and that positions an object to be sandwiched with respect to the chuck.