JPH0487789A - chuck device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a chuck device suitable for use in a workpiece conveyance device in a dynamic balance testing machine or the like.

[Prior Art] A chuck device is attached to the piston rod of a pneumatic cylinder via a bent link device, and is used in a chuck device that clamps or releases an object by expanding and contracting the cylinder, or in a conveying device such as a dynamic balance tester. ing. This chunking device has a pair of left and right chucks for gripping the left and right shafts of a workpiece, such as a rotor of a motor, and these chucks are attached to a cylinder via a fixing member.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional chuck device, when there is variation in the diameter of the left and right shafts of the workpiece, for example, there are two types of shaft diameters on the right side, 10 mm and 12 mm, and the shaft diameter on the left side is 171
There was a problem in that when the distance was constant, for example, one shaft could be gripped correctly, but the other shaft could not be gripped correctly. To solve this problem, the left and right chucks can be driven by separate cylinders, but
Providing two cylinders in this manner is undesirable because it is structurally complex and dimensionally large.

An object of the present invention is to enable objects of different diameters to be simultaneously and correctly chucked with one cylinder.

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

That is, the chuck device according to the present invention includes a connecting shaft that is 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 connecting shaft that is attached to both left and right sides of the connecting shaft via link devices, respectively. It is characterized by comprising a pair of left and right chucks that clamp an object by receiving a force in the closing direction when the shaft moves downward, and a positioning device that positions the clamped object 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 workpiece, a force in the closing direction is applied to the chuck by the action of the link device, thereby chucking the workpiece. Since the connecting shaft can be tilted up and down like a seesaw, when pressed downward, the smaller diameter of the workpiece will be tilted lower, and the closing action of the chuck on that side will be increased accordingly. Therefore, it is possible to correctly chuck workpieces having different diameters on the left and right sides.

[Examples] Examples will now be described in detail with reference to the accompanying drawings.

In this chuck device 1, a plate 5 is fixed horizontally to a piston rod 3a of a cylinder 3 supported by a machine frame 2, and a central shaft 7 is attached to the center of this plate. Further, kite rods 9, 9 are attached to both ends of the plate 5, and both guide rods are supported by linear bearings so as to be able to freely slide up and down.

A connecting shaft 1 is connected to the upper part of the central shaft 7 via a spherical bushing 10.
1 is attached in a seesaw style so that it can freely tilt. A left central shaft 14 and a right central shaft 15 are connected to both left and right ends of the connecting shaft 11 via spherical bushings 13, 13, respectively. These left and right central shafts 14 and 15 are supported by tri-hair links 17° 17 so as to be slidable left and right, and a chuck 20 is connected to the outside of the tri-hair links 17 via links 19. . A pin 22 is attached to the housing 21 supported by the central shaft 7 at the middle part of the chuck 20.
The upper end portion is pivotally connected to the link 19 by a pin 23. At the lower end of the chuck 20,
A recess 20a is formed in which the shaft of the workpiece engages.

A sleeve 25 is slidably fitted to the lower end of the central shaft 7, and a notch 27 for positioning the workpiece is attached to the sleeve. Further, a pin 29 attached to the sleeve 25 is slidably fitted into a vertical groove 7a carved 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 be moved in and out.

Next, the operation of this chuck device 1 will be explained.

As shown in FIG. 4, when nothing is chucked, the cylinder is contracted and the connecting shaft 11 is kept horizontal. When chucking a work W with the left and right axes a and b having different diameters (a>b) using this chuck device 1, the fifth
As shown in the figure, the cylinder is extended to bring the notch 27 into contact with the workpiece W. At this time, the connecting shaft 11 is tilted, and the link 19 of the chuck with the smaller diameter (on the right side of the figure) is pushed more, so the chuck on that side closes more, and the shaft with the smaller diameter is closed. Chucking.

Conversely, if the axis a on the opposite side is small, the connecting shaft 11 will tilt downward to the left, and the chuck on the left side will be closed more. In this way, the closing amount of the left and right pair of chucks is adjusted according to the workpiece, so it is possible to successfully grip workpieces with different diameters on the left and right sides. When the connecting shaft 11 is tilted, a difference occurs in the dimensions A and B in the width direction in the figure, or this difference is absorbed by sliding in the dry hair ring. Note that since the notch 27 is moved in and out to some extent by the spring 30, positioning can be performed accurately.

Next, FIG. 6 shows an embodiment different from the above, in which dry bearings 17', 17' for linear motion are provided at both ends of the connecting shaft 11, and the central shaft 14. Dry hair ring 17 between 15 and link 19
．． 17 is a bearing for rotation. That is,
In this embodiment, the bearings of the rotating part and the linear movement part are separated, so that linear movement is performed between the connecting shaft 11 and the spherical bushing 10.13.

[Effects of the invention] This chuck device is capable of reliably chucking workpieces with uneven left and right diameters using a single cylinder, and also eliminates the need to increase the overall size of the device.
For example, when this is used in a conveyance device, it has become possible to reduce the inertia weight of the contact conveyance device.

[Brief explanation of drawings]

FIG. 1 is a front view with a part of an embodiment of the present invention in cross section, FIG. 2 is a side view with that part omitted, FIG. 3 is a side view thereof, and FIGS. 4 and 5. is an explanatory diagram of the operation, part 6
The figure is an explanatory diagram of a different embodiment. 3...Cylinder 7...Central axis 10.1
3... Bush 11... Connection shaft 19... Link 20... Chuck 27... Notch (positioning device) Patent applicant Shimadzu Corporation

Claims (1)

[Claims] (1) A connecting shaft that is supported by a central shaft that moves up and down by a cylinder so that it can tilt left and right in a seesaw style, and is attached to both left and right sides of the connecting shaft via link devices, and when the connecting shaft moves downward, A chuck device comprising a pair of left and right chucks that receive a force in the closing direction to clamp an object, and a positioning device that positions the object to be clamped relative to the chuck.