JPS614606A - Centripetal chucking device - Google Patents

Abstract

PURPOSE:To enable even a large diameter work to be chucked with a small- sized device by interconnecting a plurality of independent slide units with a training-over transmission mechanism to give the same and simultaneous slide to a slide block of each unit. CONSTITUTION:Three sets of slide units 1 are mounted on a base plate 2 concentrically about the center thereof. A chain 12 is trained over a sprocket 9 of each unit. A rack 7 of the unit 1 receiving the drive force of a drive mechanism 6 is moved so that sprockets 9 of other units 1 are simultaneously and equally rotated by the chain 12 through the sprocket 9 and a slide block (not shown) of each block slides equally relative to a work to perform centripetal chucking.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for centripetal chucking of disc-shaped, cylindrical or cylindrical objects.

Conventional structure and its problems Conventionally, as a device for chucking disc-shaped, cylindrical or cylindrical objects, as typified by the scroll chuck,
Various types of centripetal chucking devices are used.

However, in such conventional chucks, as the diameter of the object to be chucked increases, the chuck itself also becomes correspondingly large, resulting in a significant increase in weight and cost. Therefore, even if the disc is thin, if its diameter becomes large, a large chuck is required, which is very uneconomical.

Furthermore, because of the structure of this type of chuck, the mechanisms are concentrated in the center of the chuck, so the space A for accommodating the chucked object becomes narrow, as shown in Figures 1-1 and 1-2. . Therefore, as mentioned above, there is a disadvantage that the chuck becomes large, which is very disadvantageous.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a device that is small but capable of chucking large objects.

Structure of the Invention The present invention connects three or more independent sliding mechanism units using a winding transmission mechanism, and causes the sliding blocks of each unit to slide simultaneously and by the same amount. It is characterized by causing chucking.

Further, in the device of the present invention, as shown in FIG. 2-1, since the mechanism is not located in the center, the space indicated by the symbol A is wide. Therefore, for example, as shown in FIG. 3, it is possible to install other equipment B in the space A, and the range of use can be greatly expanded.

Description of examples Embodiments will be described in detail below based on the accompanying drawings.

The device according to the present invention comprises three sets of sliding blocks 3 (
(or more) sliding mechanism unit 1 (see Fig. 2-1). - the fourth sliding mechanism unit 1 of the set;
As shown in FIG. 1 and FIG. 4-2, the other sliding mechanism units 1 have the same structure.

The configuration of the sliding mechanism unit 1 will be described in detail below.

The sliding block 3 is guided by a guide member 4 so as to be movable in the radial direction. This sliding block 3 has
A stopper fitting 14 is attached that comes into contact with the rack 7 and the workpiece. Further, a well-known drive mechanism 6 (for example, an air cylinder) is connected to one of the sliding blocks 3 via a connecting portion 5, and the sliding block 3 is driven by this drive mechanism 6.

Further, a rotary shaft 11 is rotatably attached to the guide member 4 via a bearing 10 . A pinion 8 is fixed to this rotating shaft 11, and this pinion 8 meshes with the rack 7. The rotating shaft 11 has a sprocket 9 in addition to the pinion 8.
4 has been removed, pinion 8 and sprocket 9
rotates integrally with the rotating shaft 11.

The sliding mechanism unit 1 described above is arranged on a concentric circle centered on the center O of the base plate 2, as shown in FIG. 2-1, and so that the sliding direction of one movement block 3 passes through the center O. Three sets are arranged on the base plate 2. A chain 12 is wrapped around each sprocket 9, and each sliding block 3 is connected so as to operate as one unit.

Now, when the surrounding block 3 moves in response to the drive horn of the drive mechanism 6, the linear movement of this sliding block 3 is caused by the rack 7.
and is converted into rotational motion of the rotating shaft 11 by the pinion 8 . The chain 12 is driven through the sprocket 9 by the rotation of the rotating shaft 11, and all the sprockets 9 of the other mechanical units 1 are rotated simultaneously and by the same amount. That is, each rotation @11 rotates 1 at the same time and by the same amount, and this rotational motion is converted into linear motion via the pinion 8 and rack 7, and the sliding block 3 slides.

As mentioned above, in this device, the sliding blocks 3 of all the sliding mechanism units 1 slide at the same time and by the same amount due to the driving force applied to one sliding mechanism unit 1, so that the cylindrical, Disc-shaped and cylindrical objects can be centripetally chucked.

In this embodiment, a case has been described in which the sliding block drive mechanism is provided at one location, but the required number may be installed in two or more sets of mechanism units as necessary.

Further, in this embodiment, the drive mechanism 6 that drives the sliding block 3 is used, but a drive mechanism that rotates the rotating shaft 11 may be used.

In addition, for the sprocket and chain described above, other transmission mechanisms such as pulleys and belts may be used.

Effects of the Invention As described above, according to the present invention, it is possible to make a centripetal chucking device for a workpiece having a large diameter smaller in size than the conventional device and to provide it at a lower cost.

Further, the present invention can be used as a centripetal clamp of a workpiece to be welded in a welding device, various machine tools, and a positioning device.

Moreover, because of its structural features, it has a large space in the center, making it easy to attach other equipment, and the range of applications has expanded dramatically.

[Brief explanation of drawings]

1-1 and 1-2 are a front view and a plan view of a conventional scroll chuck. FIG. 2-1 is a front view showing one embodiment of the device of the present invention, and FIG. 2-2 is a side view of the device shown in the same figure as viewed from the direction of arrow C. FIG. 3 is a plan view showing a state in which other equipment is attached to the apparatus of the present invention. Fig. 4-1 is a plan view showing the sliding mechanism unit of the device of the present invention, and Fig. 4-2 is a sectional view taken along the cutting line ■-■ in the figure. 1...Sliding mechanism unit 2...Base plate 3
...Sliding block 4...Guide member 6...
Drive mechanism 7...Rack 8...Pinion
9... Sprocket 11... Rotating shaft
10...Bearing 12 Chain Patent Applicant Matsushita Electric Industrial Co., Ltd. No. 1-IE Fig. 2-1

Claims (3)

[Claims] (1) A sliding mechanism unit having a sliding block for gripping a workpiece, a rack attached to this sliding block, and a pinion that can mesh with this rack and move the sliding block. one or more sets are arranged on a concentric circle centered on the center of the base plate so that the sliding direction of the sliding block passes through the center of the base plate, and the pinion of each sliding mechanism unit is wrapped around and driven by a transmission mechanism. A centripetal chucking device characterized in that the sliding blocks are connected together and move simultaneously and by the same amount to centripetally chuck a workpiece. (2) The winding transmission mechanism comprises a sprocket attached to rotate integrally with the pinion, and a chain wrapped around each of these sprockets. Centripetal chucking device. (3) The winding transmission mechanism comprises a pulley attached to rotate integrally with the pinion, and a belt wound around these pulleys.
The centripetal chucking device according to item 1).