JPH1084001A - Lead frame transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead frame transfer device in which a sheet of interlayer paper can be recovered in an excellent workability by quickly judging whether a transfer head did not pick up the interlayer paper by error when the lead frames, laminated in a magazine pinching the interlayer paper, are picked up one by one and transferred to a conveying path. SOLUTION: A transfer head 20 has probes 25 in addition to a nozzle 21 with which lead frames 1 are vacuum sucked. When the transfer head 20 comes down, the suction pads 22 on the lower end part of the nozzles 21 reach the lead frames 1, springs 24 are compressed, and the probes 25 also reach the lead frames 1. At this point, by detecting whether a short-circuit is generated between the probes 25, the state between the lead frames 1 and the sheet of interlayer paper is judged. In the case of the lead frames 1, they are picked up and moved to a conveying path, and in the case of the sheet of interlayer paper, it is recovered by a recovering part by the transfer head 20 of a recovering head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame transfer apparatus for transferring lead frames stacked and stored in a magazine one by one to a transport path.

[0002]

2. Description of the Related Art A lead frame used in an electronic component assembling process is housed in a magazine laminated with an interlayer paper interposed therebetween. After being transferred to a transport path one by one by a transfer head, the lead frame is transferred to the transport path. Along the way, it is transported to an assembly line for electronic components such as a die bonder.

FIG. 5 is a side view of a conventional lead frame transfer device. The lead frame 1 is housed in a magazine 3 alternately with the interlayer paper 2 with the interlayer paper 2 interposed therebetween. A push-up plate 4 is provided in the magazine 3, and the lead frame 1 and the interlayer paper 2 are stacked on the push-up plate 4. The lifting plate 4 is driven up and down by driving means (not shown). By gradually pushing up the push-up plate 4 with the push-up rod 5, the level of the upper surface of the uppermost lead frame 1 is maintained at a predetermined level.

[0004] A transport path 6 for the lead frame 1 is provided on the side of the magazine 3, and a collection section 7 for the interlayer paper 2 is provided on the opposite side. A proximity sensor 9 is provided between the magazine 3 and the transport path 6. 10
Is a transfer head having a nozzle 11 for vacuum-sucking the lead frame 1. A suction pad 12 is attached to a lower end of the nozzle 11. A collection head 13 has a nozzle 14 and a suction pad 15 for vacuum-sucking the interlayer paper 2. The transfer head 10 and the collection head 13 are integrally connected by a frame 16, and perform a vertical operation and a horizontal movement operation by means not shown.

Next, the operation will be described. The transfer head 10
By performing the lowering / upward operation above the magazine 3,
The uppermost lead frame 1 in the magazine 3 is vacuum-sucked to the suction pad 12 and picked up. Prior to the transfer head 10 picking up the lead frame 1 in the magazine 3, the interlayer paper 2 on the uppermost lead frame 1 is picked up by the collection head 13 and collected by the collection unit 7. Next, the transfer head 10 transports the picked-up lead frame 1 toward the transport path 6, and in the middle thereof, the proximity sensor 9 detects whether the suction pad 12 has erroneously vacuum-adsorbed the interlayer paper 2. . The proximity sensor 9 magnetically distinguishes between metal (lead frame 1) and non-metal (interlayer paper 2).

[0006] Now, the suction pad 12 is
Is detected by the proximity sensor 9, the transfer head 10 moves directly above the transport path 6, and performs the lowering / upward operation again to move the lead frame 1 to the transport path 6. Put on. The lead frame 1 placed on the transport path 6 is sent to an assembly line for electronic components such as a die bonder.

On the other hand, if the proximity sensor 9 detects that the suction pad 12 is vacuum-sucking the interlayer paper 2, the transfer head 10 moves above the collection unit 7, where the vacuum suction of the interlayer paper 2 is performed. The state is released and the interlayer paper 2 is collected by the collection unit 7
Let it fall. Next, the transfer head 10 returns above the magazine 3 and repeats the above-described operation. In FIG. 5, an arrow A indicates a movement locus of the transfer head 10 when the interlayer paper 2 is collected by the collection unit 7.

As described above, before the transfer head 10 picks up the uppermost lead frame 1 in the magazine 3, the interlayer paper 2 on the lead frame 1 is picked up by the collection head 13 and collected by the collection unit. 7, the transfer head 10 should not originally pick up the interlayer paper 2. However, if the interlayer paper 2 is erroneously inserted between the lead frames 1, 13 may fail to pick up the interlayer paper 2, and in such a case, the transfer head 10 erroneously picks up the interlayer paper 2.

[0009]

In the above-described conventional lead frame transfer apparatus, the transfer head 10 picks up the lead frame 1 in the magazine 3 and then moves once above the proximity sensor 9 where it is moved. It is determined whether or not 1 is vacuum-sucked, and if it is determined that the interlayer paper 2 is vacuum-sucked by mistake, it moves to the collection unit 7 side and collects the interlayer paper 2 into the collection unit 7. It was like.

As described above, conventionally, the transfer head 10 that has picked up the lead frame 1 once moves to the position above the proximity sensor 9 to detect whether the interlayer paper 2 has been erroneously picked up. If paper 2 was picked up, it would have to be moved to magazine 3 side,
There is a problem that the movement locus of the transfer head 10 indicated by the arrow A becomes longer, the tact time becomes longer, and the work efficiency does not increase.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lead frame transfer apparatus capable of quickly determining whether a transfer head has erroneously picked up an interlayer sheet and recovering the interlayer sheet with good workability. .

[0012]

SUMMARY OF THE INVENTION According to the present invention, there is provided a lead for picking up a lead frame, which is stacked and stored in a magazine with interlayer paper interposed therebetween, by a transfer head and transferring the lead frame to a transport path provided on a side of the magazine. A frame transfer device, wherein the transfer head includes a nozzle and a probe for vacuum-sucking the lead frame, and the nozzle is resiliently held up and down by a spring. When the lower end lands on the lead frame in the magazine, the spring is compressed and the probe lands on the lead frame, and when the transfer head is raised, the spring extends to lower the lower end of the nozzle. The probe protruded below the lower end of the probe.

[0013]

According to the present invention, immediately after a transfer head picks up a lead frame in a magazine,
It is determined whether or not the interlayer paper has been erroneously picked up. If the interlayer paper is picked up, it can be quickly recovered.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a lead frame transfer device according to an embodiment of the present invention, FIGS. 2 and 3 are front views of a transfer head of the lead frame transfer device, and FIG. It is a block diagram of a control system. Note that the same elements as those in the conventional example shown in FIG.

First, the overall structure of a lead frame transfer device will be described with reference to FIG. The lead frame 1 is stacked and stored in a magazine 3 with an interlayer paper 2 interposed therebetween.
A push-up plate 4 is provided in the magazine 3, and the lead frame 1 and the interlayer paper 2 are stacked on the push-up plate 4.
By gradually pushing up the push-up plate 4 with the push-up rod 5, the level of the upper surface of the uppermost lead frame 1 is maintained at a predetermined level.

A transport path 6 for the lead frame 1 is provided on the side of the magazine 3, and a collection section 7 for the interlayer paper 2 is provided on the opposite side. Reference numeral 20 denotes a transfer head having a nozzle 21 for vacuum-sucking the lead frame 1. A suction pad 22 is attached to the lower end of the nozzle 21. Reference numeral 13 denotes a collection head, which is an interlayer paper 2
Has a nozzle 14 and a suction pad 15 for vacuum suction. The transfer head 20 and the collection head 13 are integrally connected by a frame 16.

Reference numeral 30 denotes a cylinder, and the frame 16 is connected to a lower end of a rod 31 of the cylinder. Therefore, when the rod 31 protrudes and retracts, the transfer head 20 and the collection head 1
Numeral 3 integrally performs a descending / upward operation. That is, the cylinder 30 serves as a means for vertically moving the transfer head 20 and the collection head 13. A slider 32 is connected to an upper portion of the cylinder 30. The slider 32 is a horizontal shaft 3
3 is slidably mounted. 34 is the shaft 3
3 is a holding frame. The slider 32 moves horizontally along the shaft 33 by air pressure. That is, the slider 32 and the shaft 33 are moving means for moving the transfer head 20 and the collection head 13 in the horizontal direction.

Next, the structure of the transfer head 20 will be described with reference to FIGS. The transfer head 20 has the nozzle 2
The suction pad 22 is attached to the lower end of the nozzle 21. The nozzle 21 is mounted on the lower end of the nozzle shaft 23. A spring 24 is mounted on the nozzle shaft 23, and the nozzle 21 is elastically held up and down by the spring force. In FIG. 1, the spring 24 is omitted. The transfer head 20 has two pin-shaped probes 25 suspended therefrom. As shown in FIG. 2, when the suction pad 22 does not land on the lead frame 1 in the magazine 3, the nozzle 21 is repelled by the spring 24 and protrudes below the lower end of the probe 25 ( Height difference H), FIG.
The transfer head 20 is lowered as shown in FIG.
When the probe lands on the lead frame 1, the spring 24 is compressed, the nozzle 21 is pulled upward, and the probe 25 lands on the lead frame 1.

Next, a control system will be described with reference to FIG.
A control unit 40 controls a cylinder driving unit 41 that drives the cylinder 30, valves 42 and 43, a notification element 47, and the like. The valves 42 and 43 are connected to a vacuum unit 44, and are connected to the transfer head 20 and the collection head 13 via pressure sensors 45 and 46. Probe 2
5. The outputs of the pressure sensors 45 and 46 are input to the control unit 40.

The transfer head 20 and the collection head 13 move up and down above the magazine 3 to pick up the lead frame 1 and the interlayer paper 2. In this case,
Pressure is detected by the pressure sensors 45 and 46. If the detection values of the pressure sensors 45 and 46 do not fall below the threshold values, the suction pads 22 and 15 do not vacuum-suction the lead frame 1 or the interlayer paper 2, and it is determined that there is a pick-up error and the control unit 40. Judge. The suction pads 22 and 1
If the lead 5 sucks the lead frame 1 or the interlayer paper 2, the suction path is closed and the pressure decreases, but if the suction is not made, the pressure does not drop. That is, immediately after the transfer head 20 and the collection head 13 perform the pick-up operation of the lead frame 1 and the interlayer paper 2, the presence or absence of a pick-up error is inspected. Of course, as a method of inspecting the presence or absence of a pick-up error, a method of optically detecting the lead frame 1 or the interlayer paper 2 and the like can be applied in addition to the method of using the pressure sensors 45 and 46.

This lead frame transfer device is configured as described above, and its operation will be described next. In FIG. 1, when the transfer head 20 is positioned above the magazine 3 and the rod 31 of the cylinder 30 protrudes and retracts, the transfer head 20 performs a lowering / elevating operation, and the uppermost lead is attached to the suction pad 22. The frame 1 is vacuum-adsorbed and picked up.

FIG. 3 shows a state where the transfer head 20 is lowered and the suction pad 22 lands on the lead frame 1. In this state, the spring 24 is compressed and the lower end of the probe 25 lands on the lead frame 1. Therefore, by detecting whether or not the probe 25 is short-circuited, it is determined whether the lead frame 1 has conductivity or the interlayer paper 2 has insulation. Then, when the lead frame 1 is detected, the lead frame 1 is
Is picked up by vacuum suction. In this case, as described above, the presence or absence of a pickup error is inspected by the pressure sensor 45.

If there is no pick-up error, the transfer head 20 moves above the transport path 6 in FIG.
Then, the transfer head 20 descends to land the lead frame 1 on the transport path 6, whereupon the lead frame 1 is released from the vacuum suction state and then moved upward to transfer the lead frame 1 to the transport path 6. Next, the lead frame 1 is transported on the transport path 6 to an assembly line such as a die bonder. If it is determined that there is a pickup error, the pickup operation is repeated again. When it is determined that there is a pickup error even after performing the pickup operation a predetermined number of times, the control unit 40 drives the notification element 47 to notify the operator of the fact.

If it is detected that the paper is an interlayer paper 2, the transfer head 20 vacuum-adsorbs the interlayer paper 2 with the suction pad 22 to pick it up, and moves to a position above the collection unit 7, where the vacuum suction is performed. The state is released and the interlayer paper 2 is collected by the collection unit 7
Let it fall. Alternatively, in this case, the pickup of the interlayer paper 2 by the transfer head 20 is stopped, the collection head 13 is moved above the magazine 3, and the collection head 13 is caused to perform a lowering / upward operation. Is picked up by vacuum suction, and then moved to a position above the collecting section 7 where the vacuum suction state is released and the interlayer paper 2 is dropped onto the collecting section 7. When the collection of the interlayer paper 2 is completed as described above, the transfer operation of the lead frame 1 by the transfer head 20 is restarted. If it is determined that the collection head 13 has missed the pickup of the interlayer paper 2, the pickup operation is repeated again. When it is determined that there is a pickup error even after performing the pickup operation a predetermined number of times, the control unit 40 drives the notification element 47 to notify the operator of the fact.

The present invention is not limited to the above-described embodiment. For example, only one probe is provided, a magazine is formed of a conductive material, and the presence or absence of a short circuit between the probe and the magazine is detected. The lead frame and the interlayer paper may be determined.

[0026]

According to the present invention, when the nozzle of the transfer head lands on the lead frame in the magazine, the probe simultaneously lands on the lead frame. Pickup can be eliminated. In addition, when the transfer head is raised, the lower end of the nozzle nozzle protrudes below the lower end of the probe due to the spring force of the spring, so that the probe hinders the pickup of the lead frame and vacuum suction by the nozzle. Therefore, the lead frame can be reliably picked up by the nozzle and transferred to the transport path.

[Brief description of the drawings]

FIG. 1 is a side view of a lead frame transfer device according to an embodiment of the present invention.

FIG. 2 is a front view of a transfer head of the lead frame transfer device according to one embodiment of the present invention;

FIG. 3 is a front view of a transfer head of the lead frame transfer device according to one embodiment of the present invention;

FIG. 4 is a block diagram of a control system of the lead frame transfer device according to one embodiment of the present invention;

FIG. 5 is a side view of a conventional lead frame transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead frame 2 Interlayer paper 3 Magazine 20 Transfer head 21 Nozzle 22 Suction pad 25 Probe 30 Cylinder

Claims (1)

[Claims] 1. A lead frame transfer device for picking up a lead frame stored in a magazine with interlayer paper sandwiched between layers by a transfer head and transferring the lead frame to a transport path provided on a side of the magazine. The transfer head includes a nozzle and a probe for vacuum-sucking the lead frame,
And the nozzle is held up and down by a spring so that it can move up and down, and when the transfer head is lowered and the lower end of the nozzle lands on the lead frame in the magazine, the spring is compressed and the probe is moved to the lead frame. A lead frame transfer device wherein the spring extends when the transfer head lands and the transfer head is raised so that the lower end of the nozzle projects below the lower end of the probe.