JP3097288B2 - Lead frame transfer equipment - Google Patents

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, and more particularly to a means for flexibly coping with a change in the type of a lead frame.

[0002]

2. Description of the Related Art A die bonding step of mounting a die on a lead frame is performed by applying a bond to a lead frame positioned on a transport rail and mounting the die thereon. Then, as a pre-process, the solidly stacked lead frames are transferred from the magazine to the transport rail.

Heretofore, this transfer head has conventionally been performed by a transfer device in which a suction pad is fixed downward at a lower portion of the head.

[0004]

However, in recent years, demands for high-mix low-volume production have been increasing even when performing die bonding. Therefore, according to the above-described conventional means, every time the size of the lead frame to be transferred is changed, the entire die bonding process is stopped, and the head portion of the transfer device is manually attached and detached and replaced. However, in this case, when die bonding is performed on various types of lead frames, the loss time is greatly increased, and the work yield is reduced.

Accordingly, an object of the present invention is to provide a transfer apparatus which can flexibly cope with a change in the type of lead frame and a change in size.

[0006]

According to the present invention, a plurality of suction pads are provided below a head to suck both side edges of a lead frame, and the head is provided with means for changing the arrangement of these suction pads. It is a thing.

[0007]

According to the above arrangement, when the size of the lead frame changes, the arrangement of the suction pads is changed so that the arrangement changing means is driven so that the side edges of the new lead frame can be sucked. In addition, since there is no need to manually attach and detach the head unit for this change, it is possible to reduce the loss time and prepare a head unit with suction pads of different arrangements for each lead frame size. There is no need to keep it.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an overall perspective view of a transfer device of the present invention, FIG. 2 is an enlarged perspective view of a head portion, FIG. 3 is a schematic diagram of a suction pad arrangement changing means, and FIG. 4 is operation of a guide roller of a lead frame. FIG.

In FIG. 1, 1 is a head, 2 is a suction pad, LF is a lead frame, and R is a transport rail. Further, FR is a support frame.
0, the discarded magazine 54 and the lower part of the Z table 52 are fixed. Reference numeral 50 denotes a magazine for storing the solidly stacked lead frames LF.
It is connected to a Z table 52 via a bracket 51. Therefore, when the Z-table driving motor 53 is driven, the Z-table 52 and the magazine 50 move up and down, and the height of the top of the solidly stacked lead frames LF is set to the suction position QH of the suction pad 2 (see FIG. 2). Can be matched. When the suction pad 2 erroneously sucks two lead frames LF at a time, the waste magazine 54 detects the erroneous suction by the erroneous suction detection sensor 20 (see also FIG. 2), and detects the erroneously suctioned lead frame LF. Is dropped into the inside 54a and discarded. In addition, this waste magazine 5
4 may be disposed between the magazine 50 and the Z table 52.

Next, the drive system of the head 1 will be described.
First, reference numeral 41 denotes a support plate 40 (support frame FR
Guide rail fixed to the
Reference numeral 3 denotes a slider slidably engaged with the guide rail 41, reference numeral 42 denotes a slide plate whose rear lower portion is fixed to the slider 43, and reference numeral 44 denotes a middle width (X) of the slide plate 42.
The distal end 45 a of a rod 45 of a Y-direction cylinder SY fixed to the support plate 40 is connected to one end 44 a of the connecting rod 44. Also,
The front of the slide plate 42 is the support plate 4 of the Z-direction guide 47.
6 fixed. SZ is a Z-direction cylinder fixed to the front portion of the slide plate 42, and its rod (not shown) is loosely inserted into the slide plate 42 and the support plate 46. It is connected to the center.

Therefore, when the Y direction cylinder SY is driven, the slide plate 42 and the head 1 move back and forth along the guide rail 41 in the Y direction, and the suction pad 2 supported by the head 1 is moved in the Y direction. I can do it. When the Z-direction cylinder SZ is driven, the head 1 and the suction pad 2 move up and down along the Z-direction guide 47 in the Z-direction.

Reference numeral D denotes a dispenser for applying a bond C to a predetermined position of the lead frame LF. With respect to the positioning of the dispenser D in the Z direction, the conventional technique has the following problems. In FIG. 5, DP is a positioning pin, and DN is a nozzle. Here, conventionally, as shown in FIG. 5A, a positioning pin is engaged with a constricted portion D1 of a dispenser D and the like, so that a tip portion DNa of a nozzle DN and
The height DH with the lead frame LF has been determined. However, the dimensional variation in processing is large in the nozzle DN,
Further, the distance S from the positioning pin DP to the distal end portion DNa greatly varies due to the variation in the mounting state of the nozzle DN, and the reliability of the height DH was low.
Therefore, when the dispenser D is lowered by a predetermined stroke from the positioned height and the bond C is applied, the nozzle DN and the lead frame LF get too close due to the variation of the distance S (see FIG. 5C). ) Or too far apart (see FIG. 3 (d)), and the discharge amount and application area of the bond C vary greatly.
Therefore, as shown in FIG.
A nozzle tip detection sensor DS is arranged at a height equal to
The dispenser D is lowered as shown by the dashed line in FIG. 3B, and the height at which the sensor DS detects the tip of the nozzle DN is defined as the reference height B. L. And the reference height B. L. It may be positioned at a position (see the solid line) raised from the target by a predetermined height DH.

Next, the arrangement changing means 10 of the suction pad 2 will be described in detail with reference to FIG. First 11
Denotes an X slide rod, and 16 denotes a Y slide rod. The clampers C1 and C2 connected to both ends of the Y slide rod 16 are
The timing belt BY is clamped. Then, the rotational force of the output shaft of the motor MY is transmitted to the Y slide rod 1 via the gears G1 and G2, the pulley P, and the timing belt BY.
6 so that the Y slide rod 16 can move a desired distance in the Y direction.

A clamper C3 for clamping the timing belt BX is connected to one end of the X slide rod 11, and the rotational force of the output shaft of the motor MX is applied to the gears G3, G4,
The signal is transmitted to the X slide rod 11 via the pulley P and the timing belt BX so that the X slide rod 11 can move by a desired distance in the X direction. Then, the other end of the X slide rod 11 is bent upward and its tip 11
a is a guide groove 1 provided in the base 1 as shown in FIG.
a is slidably engaged in the X direction. In addition, a ground roller 12 is provided at the front end 11a so as to be in contact with the edge of the guide groove 1a.

The X slide rod 11 and the Y slide rod 16 intersect slidably. That is,
A guide shaft 13 is provided in the length direction of the X slide rod 11, and the upper portion of the guide shaft 13 is connected to a guide bush 14 fixed to a first suction pad support plate 17.
It is slidably inserted (see also FIG. 3B). A projection 15 is provided at the upper center of the first suction pad support plate 17. The projection 15 is slidably engaged with a slide groove 16 a formed in the length direction of the Y slide rod 16. I have. A second suction pad support plate 18 is fixed to an end of the X slide rod 11 on the clamper C3 side. A bracket 19 is provided at the lower right corner of the head 1.
Is fixed, and the suction pad 2 is supported by the bracket 19. That is, the suction pad 2 is XY
Immobile in direction. The suction pad 2 is supported on the Y slide rod 16 at the same position as the suction pad 2 in the X direction. The suction pad 2 is immovable in the X direction and movable in the Y direction with respect to the head 1. The suction pad 2 is also supported by the second suction pad support plate 18. The suction pad 2 is movable in the X direction and immovable in the Y direction with respect to the head 1. Further, the suction pad 2 is also supported by the first suction pad support plate 17. The suction pad 2 is movable in the X and Y directions with respect to the head 1. Therefore, according to the arrangement changing means 10 described above, the distance A between the suction pads 2 in the X direction is adjusted according to the size of the lead frame LF.
By driving the motors MX and MY, the distance B in the Y direction can be freely changed without replacing the head 1.

As described above, a plurality of suction pads 2 are arranged to suck the lower portion of the head 1 and both side edges of the lead frame LF.
For example, the number may be four instead of four.

In FIG. 2, YG is provided on the head 1 and is a guide rail for guiding the movement of the Y slide rod 16 in the Y direction. YS is a slider engaged with the guide rail YG and connected to the Y slide rod 16. It is. XG is a guide rail provided on the head 1 for guiding the X slide bar 11 in the X direction, XS is a slider engaged with the guide rail XG and connected to the X slide bar 11, and H is a suction pad 2 V1 is a vacuum suction port, and BL is a bracket for connecting and supporting the motors MX and MY to the head 1.

FIG. 4 shows a guide roller unit 30 for guiding the lead frame LF placed on the transport rail R. In FIG. 4, reference numeral 31 denotes an operation cam of the guide roller unit 30, and a base end of the cam 30 is connected to the head 1,
It moves up and down integrally with the head 1. The cam 31 has a tapered surface 31a formed at a tip end thereof, and has a tapered shape. 37 is a base member fixed to the lower part of one of the transport rails R, 32 is a U-shape, a rocking body pivotally attached to the base member 37 by a shaft support 33, 36 is provided on the base member 37, A stopper that comes into contact with and separates from the lower surface of the moving body 32, a cam follower 34 is provided at the tip of the rocking body opposite to the rail, and a flange 35 is provided at the other tip.
A guide roller K for pressing the lead frame LF from above by a, and a spring K for urging the rocking body 32 toward the stopper 36 side.

Here, as shown in FIG. 4B, the suction pad 2 sucks the lead frame LF, descends integrally with the head 1, and places the lead frame LF at the position of the chain line on the transport rail R. Then, the operation cam 31 also descends integrally with the head 1, and as shown in FIG.
1a is in circumferential contact with the peripheral surface of the cam follower 34,
Rotates in the direction of arrow N. Thereby, the guide roller 3
5 is separated from the transport rail R, and the lead frame LF can land on the transport rail R. Then, when the head 1 is raised thereafter, the operation cam 31 and the suction pad 2 are raised integrally with the head 1, and the lead frame LF can be supported by the guide roller 35. In this embodiment, since the configuration is as described above, it is not necessary to provide a special driving unit for driving the guide roller 35. Note that a step is provided on the transfer rail R on the opposite side of the transfer guide roller 35, and the step allows the side edge of the lead frame LF to be reliably supported. Then, as shown in FIG. 1, the lead frame LF moves on the transport rail R and receives the application of the bond C by the above-described dispenser D.

[0021]

According to the present invention, a plurality of suction pads are arranged below the head to suck both side edges of the lead frame, and the head is provided with means for changing the arrangement of these suction pads. When the size of the frame changes,
The arrangement of the suction pads can be changed without replacing the head part, and the lead frame can be quickly transferred.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a transfer device according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a head unit according to one embodiment of the present invention.

FIG. 3 is a schematic diagram of an arrangement changing unit according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a guide roller unit according to one embodiment of the present invention.

FIG. 5 is an explanatory view of positioning of a dispenser according to one embodiment of the present invention.

[Explanation of symbols]

 LF Lead frame R Transfer rail 1 Head 2 Suction pad 10 Layout changing means

Claims (1)

(57) [Claims] In a transfer apparatus for picking up a solidly stacked lead frame by a suction pad and transferring the lead frame to a conveyance rail, a plurality of suction pads are arranged below a head to suction both side edges of the lead frame. A lead frame transfer device, wherein the head is provided with means for changing the arrangement of these suction pads.