JPH1017165A - Vacuum suction cup - Google Patents

Abstract

(57) [Problem] To provide a vacuum suction device for vacuum-adsorbing a printed circuit board using a vacuum suction disk, even if a suction hole of the vacuum suction disk overlaps a through hole of the printed circuit board. SOLUTION: A plurality of suction holes 34 are provided on the bottom surface of a vacuum suction board 24, and each suction hole 34 is provided with an intake path 37 having a ball 38 as a valve body. When the outside air is sucked through the suction holes 34 overlapping the through holes 41 when the printed circuit board 40 is sucked, the ball 38 floats up by the outside air flowing through the suction path 37 as shown by the arrow A, and the suction path 37 is closed. For this reason, the inside of the suction chamber 33 can be maintained at a high negative pressure, and the printed board 40 can be sucked by the other suction holes 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum suction disk for sucking a member through suction holes on an end face by applying a negative pressure to a hollow interior by a suction means.

[0002]

2. Description of the Related Art For example, when a stacked printed circuit board is lifted one by one from the uppermost layer and transported one by one, a chuck device provided with a plurality of vacuum suction disks 1 as shown in FIG. Is often used. The above-mentioned vacuum suction disk 1 is conventionally formed in a hollow umbrella shape, and is provided with only one suction hole 2 at the center of the bottom surface, as shown in FIG.

[0003] Such a vacuum suction disk 1 has an upper connection port 3.
Is connected to a vacuum suction device, and when the inside of the vacuum suction device is sucked by the vacuum suction device in a state where the bottom surface is pressed against the printed circuit board 4, the inside of the hollow of the vacuum suction plate 1 becomes a negative pressure. 2, so-called vacuum suction.

[0004]

The printed circuit board 4 includes:
Usually, a large number of through holes 5 are formed. However, as described above, since the conventional vacuum suction plate 1 has only one suction hole 2 on the bottom surface, when the suction hole 2 overlaps the through hole 5 as shown in FIG. Outside air is inhaled through the through hole 5. Then, the inside of the vacuum suction disk 1 does not have a sufficient negative pressure, and the printed circuit board 4 cannot be suctioned.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum suction disk which can suck a member to be sucked even if the suction hole overlaps the hole.

[0006]

SUMMARY OF THE INVENTION A vacuum suction cup according to the present invention comprises:
A plurality of the suction holes are provided, wherein the member is sucked by suction holes provided on an end face of the main body by applying a negative pressure to the hollow interior of the body by suction means. According to this configuration, since a plurality of suction holes are provided on the end surface of the main body, even if there is a suction hole overlapping the hole of the member to be sucked, the member can be sucked by another suction hole.

[0007] In this case, it is preferable to provide, in each of the plurality of suction holes, valve means for closing when air is sucked from the suction holes. The valve means is connected to each of the plurality of suction holes, and has an intake path having a large diameter part in the middle thereof, and is provided at the large diameter part of the intake path. And a closing valve body. By providing the valve means in this manner, the suction hole overlapping the hole of the to-be-adsorbed member is closed by the valve means with air suction, so that the hollow interior of the main body can be maintained at a low pressure, and the other suction holes can be used. The suction power can be increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
A description will be given based on FIG. In this embodiment, a transfer device for transferring a printed circuit board is applied to a chucking device for the printed circuit board.

First, the overall structure of the transfer device 11 will be described with reference to FIG. 4. The transfer device 11 is supported by a rail 12 and can move along the rail 12. The transport device 11 supports a vertically movable body 13 via guide pins 14 so as to be vertically movable. The vertically movable body 13 is vertically driven by, for example, an air cylinder 15 as an actuator provided in the transport device 11. It is supposed to be. In addition to the above-mentioned air cylinder 15, a driving device for raising and lowering the elevating body 13 includes a hoisting mechanism, or a device for raising and lowering the elevating body 13 by a combination of a screw rod and a nut rotated forward and reverse by a motor. Conceivable.

The elevating body 13 has a plate shape, and a plurality of supporting holes 13a (see FIG. 2) are formed in the elevating body 13 so as to vertically penetrate therethrough. Are supported so as to be vertically movable. Stop rings 1 attached to the upper and lower sides of the joint pipe 16 for retaining
A compression coil spring 19 as an urging means is provided between the lower stop ring 18 and the elevating body 13 among the members 7 and 18, and the joint pipe 16 is constantly urged downward by the compression coil spring 19. ing.

The upper end of the joint pipe 16 is connected to a manifold 21 via a tube 20. The manifold 21 is connected to a suction means via a solenoid valve 22 and a hose 23, for example, an air suction device such as an air compressor and a vacuum pump. (Not shown). The vacuum suction disk 2 according to the present invention is provided at the lower end of each joint pipe 16.
4 are attached.

As shown in FIG. 2, the main body 25 of the vacuum suction disk 24 includes upper and lower casings 26 and 27, and a partition member 28 between the casings 26 and 27. Clamp 2
It is sandwiched between upper and lower sides by 9, 29, and tightened by bolts 30 and nuts 31 as fastening means.

The upper casing 26 and the partition member 28 are formed of hard synthetic rubber or the like, and the lower casing 27 is formed of soft synthetic rubber or the like. A connection port 32 formed in the upper part of the upper casing 26 is fitted to the lower end of the joint pipe 16, whereby the suction chamber 33, that is, the lower surface of the suction body 25 is closed by the partition member 28. The hollow interior of the upper casing 26 is communicated with the joint pipe 16.

The end surface of the suction disk main body 25, that is, the bottom surface of the lower casing 27 is formed to have a slightly spherical concave surface, and a large number of suction holes 34 are formed in the bottom surface as shown in FIG. Is formed. And the lower casing 2
7, a stepped cylindrical portion 35 which is continuous with each suction hole 34 in a one-to-one relationship is integrally formed upward, and a partition member 28 has a stepped portion corresponding to each cylindrical portion 35. A cylindrical portion 36 is integrally provided so as to protrude inside the lower casing 18.

The upward cylindrical portion 35 has an upper portion formed with a large diameter, and the downward cylindrical portion 36 has a lower portion formed with a large diameter. The large-diameter portion of the lower cylindrical portion 35 is fitted and bonded to the outside of the large-diameter portion of the upper cylindrical portion 36, and the suction holes 34 are formed by the two cylindrical portions 35 and 36. An intake path 37 is formed to communicate with.

The intake passage 37 formed by the two cylindrical portions 35 and 36 has a large-diameter portion 37a in the middle thereof.
The small diameter portions 37b and 37c are continuous on both upper and lower sides of 7a. A relatively lightweight valve body ball 38 made of, for example, plastic is sealed in the large-diameter portion 37a, and the ball 38 and the upper small-diameter portion 37c are used to suction air from the suction hole 34 through the suction passage 37. Valve means 39 for preventing outside air from being sucked into the chamber 33 is provided.

Next, the operation of the above configuration will be described. Now, it is assumed that the transport device 11 has stopped above the printed circuit boards 40 stacked as shown in FIG. When the rod 15a of the air cylinder 15 advances in this state, the elevating body 13 descends and presses the plurality of vacuum suction disks 24 against the uppermost printed circuit board 40.

At this time, even if each vacuum suction disk 24 is displaced in the vertical position with respect to the printed circuit board 40, the positional displacement is caused by the compression coil spring 19 being compressed, whereby all the vacuum suction disks 24 are printed. Because the bottom surface of the vacuum suction disk 24, that is, the bottom surface of the lower casing 27 has a spherical concave surface, the peripheral edge of the bottom surface of the vacuum suction disk 24 is airtight to the printed circuit board 40. Contacting and crushing the vacuum suction disk 24
Is in contact with the printed circuit board 40.

When the bottom surface of the vacuum suction disk 24 contacts the printed circuit board 40, the solenoid valve 22 is opened,
Thereby, the air in the intake chamber 33 is sucked into the air suction device. Then, the inside of the suction chamber 33 becomes a negative pressure, so that the printed circuit board 40 is so-called vacuum-sucked in the suction hole 34. After this, the rod 1 of the air cylinder 15
5a retreats, whereby the uppermost printed circuit board 40 sucked by the vacuum suction board 24 is pulled up and transferred by the transfer device 11.

On the printed circuit board 40, usually,
A through hole 41 as shown in FIG. 1 is formed,
At the time of vacuum suction by the vacuum suction disk 24, the suction holes 34 of the vacuum suction disk 24 may overlap the through holes 41 in some cases. Then, as shown by an arrow A in FIG. 1, the intake air 3 is passed through the through hole 41 and the suction hole 34 where the outside air overlaps.
7, the air is sucked into the suction chamber 33. When the outside air flows in the intake passage 37 toward the intake chamber 33 in this manner, the ball 38 is pushed up by the air flow from the position shown by the two-dot chain line in FIG. Then, the ball 38 is maintained in a state where the small diameter portion 37b is closed by the negative pressure of the suction chamber 33.

As described above, since a plurality of suction holes 34 are formed in the bottom portion of the vacuum suction disk 24, even if any one of the suction holes 34 overlaps the through hole 41, another suction hole 34 is formed. Printed circuit board 4 by vacuum suction of 34
0 can be adsorbed.

At this time, in the present embodiment, the intake path 37 connected to each suction hole 34 is provided, and the ball 38 is provided in this intake path 37. Therefore, the intake path 37 of the suction hole 34 overlapping the through hole 41 is The intake of the outside air into the intake chamber 33 is stopped by being closed by the ball 38. Therefore, there is no possibility that the negative pressure cannot be maintained in the intake chamber 33 due to the inhalation of the outside air, and a good suction state can be obtained.

FIG. 5 shows another embodiment of the present invention.
The difference from the above embodiment is that the main body 43 of the vacuum suction disk 42 is
It is composed of a hollow main part 44 formed of hard rubber or the like, and a board member 45 formed spherically of soft rubber or the like and attached to the bottom surface of the main part 44.

A suction chamber 46 is formed in the hollow interior of the suction body 43, and a plurality of suction holes 4 are formed in the board 45.
7 are formed. In this configuration, when the suction hole 47 overlaps the through hole 41 of the printed circuit board 40, outside air is sucked into the suction chamber 46 from the overlapped suction hole 47. However, since each of the suction holes 47 has a small diameter and a large air suction resistance, even if the suction holes 47 overlap the through holes 41, the amount of intake air is not so large. high,
Due to the vacuum suction action of the other suction holes 47, the printed circuit board 40
Can be chucked, and an effect similar to that of the above-described embodiment can be obtained.

The present invention is not limited to the embodiment described above and shown in the drawings, but can be modified or expanded as follows. The cylindrical parts 35 and 36 are joined to the cylindrical part 3
The upper end of the tube 5 may be fitted inside the lower end of the cylindrical portion 36, or the upper end may be bonded by abutting the end surfaces. The means for forming the intake path 37 is not limited to the one formed by the cylindrical portions 35 and 36.

The solenoid valve 22 need not be provided. The elevating body 13 functions as a base on which the vacuum suction disk 24 is mounted, but is not limited to a vertically moving one. As the valve means for cutting off the outside air suction from the suction hole, a structure provided directly in the suction hole may be used. Although the vacuum suction disk of the present invention has been described for chucking a printed circuit board, the object to be suctioned is not limited to this. It may be an iron plate or the like.

[0027]

According to the first aspect of the present invention, even if a member to be sucked has a hole and the hole overlaps the hole, the member to be sucked can be sucked by another suction hole. Claims 2 and 3
In the suction disk described above, since the outside air is not sucked from the suction hole overlapping the hole of the member to be sucked, the object to be sucked can be more reliably sucked.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the present invention in a state in which a printed board is sucked.

FIG. 2 is a diagram corresponding to FIG. 1 in a normal state.

FIG. 3 is a bottom view of the vacuum suction disk.

FIG. 4 is an overall side view.

FIG. 5 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional vacuum suction disk;

FIG. 7 is a diagram corresponding to FIG. 3;

[Explanation of symbols]

In the figure, 16 is a joint pipe, 21 is a manifold, 22 is a solenoid valve, 24 is a vacuum suction disk, 25 is a suction disk main body, 26 is an upper casing, 27 is a lower casing, 28 is a partition member, 32
Is a connection port, 33 is a suction chamber, 34 is a suction hole, 37
Is an intake path, 37a is a large diameter portion, 38 is a ball (valve element), 3
9 is a valve means, 40 is a printed board (member to be sucked), 41
Is a through hole, 42 is a vacuum suction disk, 43 is a suction disk main body, 46 is a suction chamber, and 47 is a suction hole.

Claims (3)

[Claims] 1. A device in which a hollow portion of a main body is made to have a negative pressure by an air suction means so that a member is sucked by a suction hole provided in an end surface of the main body, wherein a plurality of the suction holes are provided. Vacuum suction disk. 2. The vacuum suction disk according to claim 1, wherein each of the plurality of suction holes is provided with valve means for closing when air is sucked from the suction holes. 3. The valve means is connected to each of the plurality of suction holes, and has an intake passage having a large diameter portion in the middle thereof, and is provided at the large diameter portion of the intake passage, and when air is sucked from the suction hole. 3. The vacuum suction disk according to claim 2, further comprising a valve body for closing an intake path.