JPS6094288A - Suction chuck - 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 The present invention relates to a suction chuck, and more particularly to a suction chuck that can correct the position of an article that has been misaligned with respect to a chuck body and suction it to a proper position.

Generally, industrial robots are often used to move electronic components such as ICs from one location to another, and the robot's operating arm usually has a vacuum suction chuck connected to a vacuum source at the end. is provided. When assembling an article such as an IC onto a substrate, positioning accuracy of the article with respect to the substrate is particularly important. This positioning accuracy is greatly influenced by the positional accuracy of the item placed before the chuck picks it up, and if the item is supplied at a position that deviates from the correct position before the chuck picks up the item, it will not be possible to place the item in the correct position on the substrate. supply becomes impossible.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a suction chuck that can correct an article placed in a position deviated from the correct position to the correct position using a correction claw during suction.

In order to achieve this object, the present invention pivots the upper part of the correction claw to the circumferential surface of the chuck body so that the tip of the claw protrudes from the suction surface of the chuck body. The spring force of the spring is applied to the side surface to expand the tip of the correction claw outward, and when vacuum suction is applied, negative pressure is applied to the inner surface of the correction claw through the suction branch path to bring the correction claw into close contact with the chuck body. This feature is characterized in that it allows the user to

An embodiment of the suction chuck according to the present invention will be described below with reference to the drawings.

In FIG. 1, the symbol l indicates the chuck body.

This chuck body 1 is a rectangular parallelepiped block with a square cross section, and has suction holes 2 along the longitudinal center line.
is drilled. This suction hole 2 stripe, its population 2a opens at the suction surface 1a, while a joint 3 is screwed into its outlet 2b, a suction hose 4 (shown by imaginary lines) is connected to this joint 3, and the hose 4 The tip is connected to a vacuum suction source (not shown).

On the other hand, straight grooves 5 are formed in the longitudinal direction on the circumferential surface of each side of the chuck body 1.

This straight groove 5 has a uniform width B and a uniform width 1. C is a straight groove with depth D. A correction pawl 6 is incorporated into each straight groove 5, and the correction pawl 6 is pivotally mounted near the upper end by a pivot shaft 7.

This correction pawl 6 can pivot outwardly around a pivot 7, and for this purpose the upper end of the inner surface 6a is obliquely cut out to form a clearance surface 6b. Further, the lower end 6C of the correction claw 60 is configured to slightly protrude from the suction surface 1a of the chuck body 1. In this way, the four correction claws 6.6, 6.6 &-! As a result, the periphery of the suction surface 1a of the chuck body 1 is partially surrounded, and a space capable of accommodating the article A to be suctioned is formed inside the correction claws 6, 6, 6.6, as will be described later.

On the other hand, a spring holder 8 is formed at the lower part of the groove bottom 5a of the straight groove 5, and this spring receiving 8 is formed.
A coil spring 9 is set inside, and the outer end of this coil spring 9 acts to press the inner surface of the correction claw 6 outward. Since the spring force of the coil spring 9 acts to press the tips of the four correction claws 6, 6, 6.6 outward, the opposing correction claws 6,
The distance W inside the tip of No. 6 is larger than the entire width of the article A to be sucked.

On the other hand, from the middle of the suction hole 2, four suction branch paths to
, io, io, to are branched, and each absorption
The pulling branch path 10 opens at the groove bottom 5a of the straight groove 5, and its opening position is directly below the pivot shaft 7 of the correction claw 6.
Negative pressure can be applied to the inner surface of the correction claw 6.

The above-mentioned suction chuck is actually preferably attached to the tip of the operating arm of a robot, for example, and is conveniently used, for example, when grabbing an electronic article such as an IC from a supply location and transporting it to a board assembly location.

Since the suction chuck according to the present invention is constructed in this way, the suction action is cut off when the suction chuck is moved to the place where the article is supplied, and at this time, the spring force of the coil spring 9 is As shown in FIG. 3, the correcting claws 6, 6, 6.6 have their tips expanded outward, and the inner rectangles of the opposing correcting claws 6, 6 are set to WK. In this expanded state, the chuck body 1 is moved directly above the article by an operating arm or the like (not shown), and
It will be lowered by N. At this time, since the tips of the correction claws 6, 6° 6.6 are widened, there will be no inconvenience caused by slight misalignment of the article. Then, when the suction surface 1a approaches the article A, when a vacuum suction force is generated, suction is generated on the inner surfaces of the correction claws 6, 6, 6.6 through the suction branch path 10, and the spring force of the coil spring 9 is applied. This causes the correction claw 6 to stick to the groove bottom 5a of the straight groove 5. At this time, the article A whose position has shifted somewhat is corrected to the correct position by the correcting claw 6 and is sucked onto the suction surface 1a. Then, by moving the operating arm to move the suction chuck main body 1 to a predetermined position and canceling the vacuum suction, the article A can be set at the desired position.

In the above embodiment, the cross section of the chuck body is configured to be square, but the present invention is not limited to this, and may be triangular, pentagonal, or Other polygons are possible.

As is clear from the above description, according to the present invention, several correction claws whose tips protrude from the suction surface are arranged on the circumferential surface of the chuck body, and the tips are expanded by a spring force just before picking up the article. Therefore, even if the position of the article is slightly deviated, the correction claw can correct the position to the correct position and then attract the article to the chuck body, and as a result, the article can be moved to the correct position.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the suction chuck according to the present invention, FIG. 2 is a plan view showing the same suction chuck, FIG. 3 is a longitudinal sectional view showing the state before suction, and FIG. The figure is a longitudinal sectional view showing the state after adsorption. DESCRIPTION OF SYMBOLS 1... Chuck body, 2... Suction hole, 5... Straight groove, 6... Correction claw, 7... Pivot, 9... Coil spring, 10... Suction branch path. Applicant's agent Kiyomi Inomata Figure 1, Item 2, Item 4-4

Claims (1)

[Scope of Claims] 1. A suction chuck in which a suction hole is formed in the chuck body and the suction hole is made to have a negative pressure to suction and hold an article on the suction surface, in which the claws are removed from the suction surface of the chuck body. Two parts of the correction claw are pivotally attached to the circumferential surface of the chuck body with the tip protruding, and a spring is installed inside the chuck body to apply a spring force to the inner surface of the correction claw and press the tip of the correction claw outward. 1. A suction chuck characterized in that a suction branch path is formed in the chuck body, the suction branch path branching from the suction hole and opening toward the inner surface of the correction claw. 2. The suction chuck according to claim 1, wherein the chuck body has a square cross section and has one correction claw pivotally attached to each side surface. 3. A spring receiver is formed on the side surface of the chuck body, a coil spring is housed in the receiver, and the outer end of the coil spring presses the inner surface of the correction claw. A suction chuck according to claim 1.