JP3696975B2 - Lead frame alignment transport device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead frame aligning and conveying apparatus in a resin sealing apparatus for resin sealing molding of semiconductor elements on a lead frame.
[0002]
[Prior art]
First, as shown in FIG. 9, the molding layout in the semiconductor resin sealing apparatus is such that the lead frames 1 and 2 are opposed to each other with a constant distance F regardless of the product type, with the resin injection hole 3 or the resin injection path interposed therebetween. . Further, since the inflow of the resin is made the same by the left and right lead frames 1 and 2, one lead frame 1 is inverted with respect to the other lead frame 2.
[0003]
It is known in Japanese Utility Model Publication No. 1-43433 that a loader that directly receives a lead frame from a lead frame aligning and conveying apparatus and conveys and supplies the lead frame onto a mold holds or holds the lead frame in the same layout as the molding layout. . Therefore, the lead frame chuck claw 8 of the loader 9 is arranged only between the resin injection holes 3 on the resin injection hole 3 side as shown in FIG. 9, while the outer claw 6 is a pilot pin on the mold. 5, it is necessary to make a nail layout without frame slack when the lead frame 7 is gripped as shown in FIG.
[0004]
If the space between the lead frame chuck claws 8 is narrow, the lead frame end face side is easily loosened as shown in FIG. 10B, and if it is wide, the lead frame 7 is easily loosened between the lead frame chuck claws 8 as shown in FIG. The belt pulley arrangement of the lead frame aligning / conveying device 12 is also easy to loosen between the belt pulleys when the belt pulley is wide, as in the case of the dimension between the lead frame chuck claws 8. Therefore, it is necessary to change the pitch, number, arrangement, lead frame length, and width dimension of the resin injection holes 3 by switching the production type, and accordingly, the layout of the lead frame chuck claw 8 of the loader 9 must be changed.
[0005]
As shown in FIG. 11, the lead frame alignment / conveying device in the semiconductor resin sealing device is such that the lead frame 7 accommodated in the magazine 10 protrudes from the magazine 10 and the drive roller 13 rotates after being projected by the device 11. Then, the sheet is conveyed by the belt 16 wound around the drive roller 13, the belt pulley 14, and the tension pulley 15, and after contacting and positioning with the stopper 19, the contact is detected (arrived) by the sensor, and then the conveyance is stopped. The belt pulleys 14 are arranged at intervals at which the lead frame 7 does not slack. Then, the lead frame 7 is supplied to the receiving mold by the lead frame chuck claw 8 of the loader 9. In this case, the side plate 17 and the wound belt 16 are provided with a relief 20 in order to avoid interference with the lead frame chuck claw 8 of the loader 9.
[0006]
[Problems to be solved by the invention]
As described above, in the lead frame aligning and conveying apparatus 12 that directly supplies the lead frame 7 to the loader 9, it is necessary to change the nail escape position in accordance with the product changeover, and the conveyance guide, the lead frame positioning stopper, The position of the lead frame detection sensor is changed, and the lead frame 7 is replaced with a dedicated belt pulley position where slack does not occur in the lead frame 7.
[0007]
In the lead frame aligning / conveying device 12 of the prior art, since the lead frame 7 is directly supplied to the loader 9 by the lead frame aligning / conveying device 12, the type is specialized, and the lead frame aligning / conveying device is used in the type switching. It is necessary to replace the entire 12, and a large number of dedicated lead frame aligning / conveying devices 12 corresponding to the products are required.
The semi-invention has been made in view of the above circumstances, and it is to make it easy to deal with product types by making the lead frame aligning and conveying apparatus from dedicated to general purpose.
[0008]
[Means for Solving the Problems]
In the present invention, a pulley is attached to a movable block, and a lead frame conveying belt is wrapped around this pulley to form a loader chuck claw relief in order to cope with changes in the loader chuck claw layout and to facilitate product compatibility. By changing the block position where the pulley is attached, the lead frame chuck pawl relief position of the loader can be changed. That is, by making the moving guide provided on the side plate movable in the longitudinal direction of the lead frame, the chuck pawl relief position of the loader can be changed. (Claim 1)
Then, the side plate on one side can be moved in the lead frame width direction together with the conveying means, and the width of the lead frame can be changed between the conveying means. (Claim 2)
Also, by attaching the lead frame slack prevention roller movably to any position of the moving guide provided on the side plate, the lead frame slack prevention roller can be attached and moved when the belt or roller is enlarged or pinched, Prevent loosening of the lead frame. (Claim 3)
Alternatively, the lead frame positioning stopper position is movably attached to the movement guide on the side plate to cope with a change in the length of the lead frame and a change in the stop position. (Claim 4)
Furthermore, the lead frame detection sensor position is movably attached to a moving guide provided on the side plate to cope with a change in the length dimension of the lead frame and a change in the stop position. (Claim 5)
[0009]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
An embodiment corresponding to claim 1 of the present invention will be described below with reference to FIGS.
First, as shown in FIG. 9, the lead frames 1 and 2 are arranged to face each other with a constant in-layout dimension F regardless of the product type, with the resin injection hole 3 interposed therebetween. In this case, the lead frame width outside 1b, 2b is changed in the width direction, and the lead frame long side 1c, 1d, 2c, 2d is changed in the length direction.
[0010]
In the first embodiment of the present invention shown in FIG. 1, a belt pulley 14 and a tension pulley 15 are rotatably attached to a moving block 21, and a lead frame transport belt 16 is wound around to form a loader lead frame chuck claw relief 20. . Further, it is attached to the slide guide 22 arranged on the side plate 17 so as to be movable in the length direction of the lead frame, and can be fixed to the slide guide 22 with a fixing screw 35. Then, the lead frames 1 and 2 are conveyed by the belt 16.
[0011]
According to this, by moving the moving block 21 attached to the slide guide 22 in the lead frame length direction, the lead frame chuck claw layout of the loader 9 is changed, and the position of the lead frame chuck claw relief 20 needs to be changed. Therefore, it is not necessary to replace the entire lead frame alignment / conveyance device with a dedicated product.
[0012]
(Second embodiment)
In the second embodiment of the present invention shown in FIG. 2, in contrast to the first embodiment, a belt 16 is wound around a lead frame feed roller 23 and a tension pulley 15 that are rotatably attached to a moving block 21 to convey the lead frame. Is performed by the lead frame feed roller 23. In this way, the same effect as in the first embodiment can be obtained.
[0013]
(Third embodiment)
In the third embodiment of the present invention shown in FIG. 3 corresponding to claim 2, the linear guide 26 has a fixed side plate 24 on the lead frame reference side (resin injection hole side on the mold) and a moving side plate 25 on the opposite side. The lead frame 7 is movable in the width direction. According to this, by moving the moving side plate 25, it is possible to cope with the width dimension of the lead frame 7, and the compatible types are expanded.
[0014]
(Fourth embodiment)
In the fourth embodiment of the present invention shown in FIG. 4 corresponding to claim 3, a loosening prevention pulley 27 for preventing looseness of the belt 16 and the lead frames 1 and 2 is attached to the slide guide 22 arranged on the side plate 17 and fixed screws. 35 is detachably attached. According to this, since the slack prevention pulley 27 can be mounted at an arbitrary position, it is mounted when the lead frames 1, 2 or the conveying belt is slack when the distance between the pulleys is long or when the end surfaces of the lead frames 1, 2 are slack. It is possible to prevent loosening of the lead frames 1 and 2 and prevent wire damage. Moreover, when it is not necessary when there is no slack, it can be removed so that the layout of the nail relief position can be freely set.
[0015]
(5th Example)
In the fifth embodiment of the present invention shown in FIG. 5 corresponding to claim 4, a movable moving stopper 30 for positioning the lead frame is attached to a slide guide 22 arranged on the side plate 17 so as to be fixed by a fixing screw 35. Is. According to this, by moving the movement stopper 30, it is possible to cope with a change in lead frame positioning dimension when the lead frame length dimension is changed, and the types of products that can be handled are expanded.
[0016]
(Sixth embodiment)
In the sixth embodiment of the present invention shown in FIG. 6 corresponding to claim 5, the sensor bracket 31 capable of moving the sensor 32 for detecting the lead frame is fixed to the slide guide 22 arranged on the side plate 17 with a fixing screw 35. It is attached as possible. According to this, by moving the sensor 32, it is possible to cope with the change of the lead frame detection position by the change of the lead frame length dimension and the change of the frame layout.
[0017]
As another embodiment, the dimension E of the lead frame chuck claw 8 and the lead frame end face 33 is constant (shown in FIG. 7), and the claw escape block, the lead frame positioning stopper, and the lead frame detection sensor are integrated with the integrally moving block 34. (Shown in FIG. 8). Alternatively, although not shown, the nail relief block and the lead frame positioning stopper, the nail relief block and the lead frame detection sensor integrated, or the lead frame positioning stopper and the lead frame detection sensor integrated Movement adjustment time at the time of switching can be reduced.
[0018]
【The invention's effect】
As is apparent from the above description, in claim 1, a belt pulley is attached to a block on which a belt is wound to form a lead frame chuck claw relief, and the block is attached to a slide guide so as to be movable in the lead frame length direction. Even if the lead frame chuck claw layout of the loader is changed and the lead frame chuck claw escape position needs to be changed, it can be handled by changing the claw escape position, and it is not necessary to replace the entire lead frame aligning and conveying device. Improves versatility.
[0019]
According to the second aspect of the present invention, the movable side plate can be moved, so that it can cope with a change in the lead frame width dimension, and the versatility corresponding to the product type is improved.
The loosening prevention pulley attached to the arbitrary position according to claim 3 is attached to prevent loosening when the lead frame or the conveying belt is loose when the distance between the pulleys is long or when the end surface of the lead frame is loose. Thus, wire damage due to loosening of the lead frame can be prevented. Moreover, when it is not necessary when there is no slack, it can be removed so that the layout of the nail relief position can be freely set.
[0020]
According to the fourth aspect of the present invention, in which the lead frame positioning stopper is movably attached, it is possible to cope with a change in the lead frame positioning dimension when the lead frame length dimension is changed, and the applicable types are expanded.
[0021]
According to the fourth aspect of the present invention, in which the lead frame detection sensor is movably attached, it is possible to cope with the change of the lead frame detection position by changing the lead frame length dimension and the frame layout, and the applicable types are expanded.
[Brief description of the drawings]
FIG. 1A is a side sectional view showing a lead frame aligning and conveying apparatus according to a first embodiment of the present invention, FIG.
2A is a side sectional view showing a lead frame aligning and conveying apparatus according to a second embodiment of the present invention, FIG.
FIG. 3 is a front view showing a lead frame aligning and conveying apparatus showing a third embodiment of the present invention;
FIG. 4 is a side sectional view showing a lead frame aligning and conveying apparatus showing a fourth embodiment of the present invention;
FIG. 5 is a side partial cross-sectional view showing a lead frame aligning and conveying apparatus showing a fifth embodiment of the present invention;
FIG. 6 is a side partial sectional view showing a lead frame aligning and conveying apparatus showing a sixth embodiment of the present invention;
FIG. 7 is a relationship diagram of lead frame chuck claws and lead frame end face arrangement,
FIG. 8 is a side partial sectional view showing a lead frame aligning and conveying apparatus showing a seventh embodiment of the present invention;
FIG. 9 is a conventional lead frame layout diagram;
FIG. 10 is an explanatory diagram of occurrence of loosening of the lead frame due to the dimension between the lead frame chuck claws
FIG. 11 is a side partial sectional view showing a conventional lead frame aligning and conveying apparatus.
[Explanation of symbols]
1, 2, 7 ... lead frame, 8 ... lead frame chuck claw,
9 ... Loader, 14 ... Belt pulley,
15 ... tension pulley, 16 ... belt,
17 ... side plate, 21 ... moving block,
22 ... slide guide, 27 ... slack prevention pulley,
30 ... Movement stopper, 32 ... Lead frame detection sensor.

Claims (5)

A lead frame is formed by a loader that has a lead frame chuck claw positioned above the lead frame alignment and transport device and grips the lead frame on the lead frame alignment and transport device, and a lead frame transport belt that operates by a belt pulley and a tension pulley. In a lead frame aligning and conveying apparatus for conveying and aligning at a predetermined position, the belt pulley and the tension pulley are attached to a movable block, and the lead frame conveying belt is wound around both pulleys to load the lead frame chuck of the loader. A lead frame aligning and conveying apparatus characterized in that a claw relief is formed, and the position of the lead frame chuck claw of the loader can be changed by changing the block position where both pulleys are attached. 2. The lead frame aligning and conveying apparatus according to claim 1, wherein the guide width of the lead frame can be changed. 2. The lead frame aligning and conveying apparatus according to claim 1, wherein a lead frame slack preventing roller is attached in a movable form. The lead frame aligning and conveying apparatus according to claim 1, wherein a stopper for stopping the lead frame is attached in a movable form. 2. The lead frame aligning and conveying apparatus according to claim 1, wherein the lead frame detection sensor is attached in a movable form.

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