JPH0671717B2 - Air-check with centering function - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air chuck having a function of centering a work, which is used in various automatic assembling apparatuses.

2. Description of the Related Art Conventionally, a chuck with a centering function of this type has a structure as shown in FIG. That is, an air cylinder is constituted by the main body portion 1 and the piston portion 2, and the work piece is chucked and unchucked by moving the air cylinder back and forth and operating the claws 4 and 5 by the tension spring 3. The centering pin 6 is axially urged by a spring 8 in a slidable state within a bearing 7 fixed to the main body 1, so that the entire chuck moves and the centering pin 6 pushes a work. The centering was done by.

Problems to be Solved by the Invention In such a conventional configuration, the force for stripping the work in the axial direction of the centering pin 6 in the chucked state acts, and the chucking force by the tension spring 3 and the work, the claws 4, and the claws 4, 5. Therefore, it is necessary to pay sufficient attention to the frictional force and the stripping force of the work by the spring 8 and there is a drawback that stability and certainty are poor. In addition, there is a drawback in that the chucking force is limited due to the performance of the work, and when the centering by the spring type as shown in FIG. 6 is impossible, the centering is performed by another actuator. It was

The present invention solves such a problem, and an air chuck with a centering function capable of removing the stripping force acting on the work by utilizing the movement of closing the chuck without adding another actuator at the time of chucking. It is intended to provide.

Means for Solving the Problems In order to solve this problem, the present invention relates to a main body portion, a piston portion that is combined with the main body portion to form an air cylinder, and the piston portion in the direction opposite to the work. The chuck mechanism unit that closes the workpiece by moving the workpiece, and opens the workpiece by moving in the workpiece direction to uncuck the workpiece, and a spring provided inside the piston portion along the central axis of the piston portion. The centering pin is configured to be biased in the work direction and movable relative to the piston portion.

Working With this configuration, the work is uncucked as the piston advances toward the work. At this time, the centering pin is biased by the spring mounted in the piston portion, and in this state, the entire chuck is moved to press the centering pin against the work, whereby the work is centered. Next, when the piston part is moved in the opposite direction to the work and returned to the work, the work is chucked, the spring in the piston also retracts, and the force for pushing the work is released by the centering pin.

As a result, it is possible to reduce or eliminate the stripping force that acts on the work during chucking.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings (FIG. 1 to FIG.
It will be described based on FIG.

In the figure, 9 is a main body part, 10 is a piston part, 11 is a lid,
The piston part 10 is slidably mounted in the body part 9 and the lid
Together with 11, it forms an air cylinder. 12 and 13 are claws, 14a and 14b are fulcrums of the claws 12 and 13, 15 is a cam follower, 1
6 is a tension spring that forms a chuck mechanism. Reference numeral 17 is a compression spring, 18 is a spacer, 19 is a C-shaped retaining ring, 20 is a centering pin, and 21 is a contact provided at the tip of the centering pin 20. The compression spring 17 is held inside the piston portion 10 by the C-shaped retaining ring 19 and the spacer 18, and the centering pin 20
Is urged in the axial direction. 22 is an uncucking air port, and 23 is a chucking air port, which are provided in the main body 9. 24 is a work.

The operation of the air chuck with a centering function configured as described above will be described with reference to FIGS. FIG. 3 shows a state where the piston portion 10 goes toward the work 24 shown in FIG. 4, and the chuck is in an uncucked state. When the entire chuck is lowered from the state shown in FIG. 3, the work 24 is centered (FIG. 4). At this time, the centering pin 20 bends the compression spring 17 and is urged to push the work 24, and is relatively moved with respect to the piston portion 10 in the direction opposite to the work 24. Compressed air is supplied to the air port 22 in both the states shown in FIGS. Next, when compressed air is supplied to the air port 23 to return the piston portion 10 to a direction away from the work 24, that is, a return state, that is, a state where the work 24 is chucked. Becomes At this time, the work 24 is not receiving the force from the centering pin 20 because the compression spring 17 is not bent. The work chuck is completed in the state shown in FIG. Usually, the work 24 is transferred from this state by raising the entire chuck.

Although the bearing of the centering pin 20 is provided in the piston portion 10 in the above embodiment, the bearing may be provided in the main body portion 9.

As described above, according to the present invention, a spring is provided inside the piston portion used for opening and closing the chuck, and a centering pin that is urged in the axial direction of the piston portion via the spring is provided. Since the urging force of the spring is released by the movement of the piston, there is no stripping force on the workpiece, it is highly stable, and a simple structure provides an air chuck with a centering function that is ideal for various automatic assembly machines. You can

[Brief description of drawings]

1 to 5 show an embodiment of the present invention.
The drawing is a front sectional view, FIG. 2 is a side view, FIGS. 3 to 5 are operation explanatory views, and FIG. 6 is a front sectional view showing a conventional example. 9 ... Main body, 10 ... Piston, 12,13 ... Claws, 17 ...
… Compression spring, 20 …… Centering pin, 24 …… Workpiece.

Claims (1)

[Claims] 1. A body portion, a piston portion which is combined with the body portion to form an air cylinder, and the piston portion is closed by movement of the piston portion in a direction opposite to the work to chuck the work, and in the work direction. Of the chuck mechanism that opens by the movement of the workpiece to uncuck the workpiece, and is urged in the workpiece direction along the central axis of the piston portion via a spring provided inside the piston portion, and is movable relative to the piston portion. An air chuck with a centering function consisting of the centering pin configured in.