JPS6256655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lead frame separating device for separating and taking out a large number of lead frames for semiconductor devices one by one which are arranged and stacked.

In semiconductor assembly equipment such as die bonders, devices that have been used to take out lead frames one by one have been used to take out lead frames one by one from those that have been separated and inserted into a stacking magazine or the like, or to take out lead frames that have been stacked on top of one another. They were to be taken out in order. These methods have the disadvantage that semiconductor assembly equipment such as a die bonder must be temporarily stopped to replenish the lead frame, or a special buffer must be provided to prevent the equipment from stopping.

The present invention has been developed in view of the above-mentioned drawbacks of the prior art, and it is possible to replenish lead frames by simply stacking them from the top by taking out a large number of stacked lead frames one by one starting from the lowest one. Therefore, it is an object of the present invention to provide a lead frame separation device that does not require stopping semiconductor assembly equipment such as a die bonder for this purpose.

In order to achieve the above object, the present invention provides support claws 5 which can be opened and closed freely to support the lead frames 4 at the lower ends of guide plates 2 and 3 for aligning and stacking a large number of lead frames 4. , a pedestal 8 that is movable up and down and supports the lead frame 4 from below when rising is disposed below the guide plates 2 and 3; A clamp member 13 capable of holding the guide plates 2 and 3 is disposed below the guide plates 2 and 3.

Next, the operation of the above configuration will be explained. When the support claws 5 are closed, the lead frames 4 stacked on the guide plates 2 and 3 are supported by the support claws 5. First, the pedestal 8 and the clamp member 13 rise, the pedestal 8 supports the lead frame 4 from below, and the clamp member 13 holds the lead frame 4 at the lowest position. Next, support claw 5
opens. In this case, even if the support claws 5 are opened, the lead frame 4 is still supported by the pedestal 8, so
The lead frame 4 does not fall from the guide plates 2 and 3. After that, the clamp member 13 is slightly lowered. As a result, the lowest lead frame 4 is bent downward. Next, the support claws 5 are closed and inserted between the lowermost lead frame 4 which is bent and the lead frame 4 above it.
Subsequently, when the pedestal 8 and the clamp member 13 are lowered, only the lowest lead frame 4 in the guide members 2 and 3 is separated and taken out.

In this way, a large number of lead frames 4 stacked in alignment are taken out one by one starting from the lowest one, so in order to replenish the guide plates 2 and 3 with lead frames 4, it is sufficient to simply stack them from the top.

Hereinafter, the present invention will be explained in detail according to embodiments shown in the drawings. FIG. 1 is a front view showing one embodiment of the lead frame separation device of the present invention, FIG. 2 is a cross-sectional view of the portion indicated by arrow A-A in FIG. 1, and FIG. Partial slope view, Figure 4 is shown by arrow B in Figure 1.
- It is a cross-sectional view of the part shown by the B line. 1 is a support base, 2 is a bottom plate fixed to the upper part of the support base 1 at an angle, and 3 is a pair of side plates installed along both sides of the bottom plate 2 perpendicularly thereto. The lead frames 4 are arranged and placed one on top of the other while being guided and supported by guide plates constructed in this way.
Reference numeral 5 denotes a pair of supporting claws that are provided along the lower edge of each of the pair of side plates 3 and support the lead frames 4 stacked together to prevent them from falling. It is attached to the tip of a freely movable arm 5' and can be opened and closed by swinging the arm 5'. A spring 6 is applied between the pair of support claws 5 and always biases the support claws 5 in the closing direction. Reference numeral 7 denotes a pair of electromagnets provided for each of the pair of arms 5' and fixed to the support base 1, which attracts the arms 5' by energization and moves the arms 5' in the direction of opening the support claws 5. It is. Reference numeral 8 denotes a pedestal that can move up and down by swinging around a support shaft 9 mounted on the support 1, and can assume a position to support the lead frame 4 from below as it rises, and 8' is a pedestal. A cam follower provided at 8 contacts a first cam 10 fixed to a camshaft 11 which is arranged parallel to the support shaft 9 and also rotatably mounted on the support base 1 . Reference numeral 12 designates clamp levers which are provided in pairs with the pedestal 8 in between, and also perform vertical movement by swinging around the support shaft 9.
A pair of clamp claws 13, which serve as spring members, are fixed to the tip. 14 is clamp lever 1
A cam follower provided at 2 contacts a second cam 15 fixed to the camshaft 11. 16 is a command cam fixed to the camshaft 11, 17 is a command cam 16
A photo sensor operated by the photo sensor sends out a signal to energize the electromagnet 7. 18 is camshaft 1
This is a motor for rotating 1.

Next, the operation of the apparatus having such a structure will be explained with reference to FIG. After aligning and stacking the lead frames 4 and placing them along the guide plate, the motor 1
8, the camshaft 11 starts rotating. When the first cam 10 rotates and pushes up the cam follower 8', the pedestal 8 swings upward and supports the lead frame 4 from below as shown in FIG. 5b from the state shown in FIG. 5a. When the camshaft 11 continues to rotate further, the second cam 15 pushes up the cam follower 14, causing the clamp lever 12 to swing upward, and the clamp claw 1
3, both ends of the lead frame 4 at the lowest position are held by the spring force. This state is shown in FIG. Then, when the command cam 16 operates the photo sensor 17, the electromagnet 7 is energized by the sent signal, and the arm 5' is attracted to open the support claw 5 as shown in FIG. 5c. Thereafter, as the second cam 15 rotates, the clamp lever 12 is lowered as shown in FIG. 5d, and the clamp claws 13 bend both ends of the lead frame 4 downward. When the command cam 16 returns the photo sensor 17, the electromagnet 7 is de-energized, and as shown in FIG. The support claw 5 is inserted between the two. Next, the first cam 10 rotates and the pedestal 8 descends as shown in FIG. The sheets are separated and removed, placed horizontally as shown in FIG. 2, and then delivered to a transport path in a known manner.

In the above embodiment, the clamp claw 13 was used, but a vacuum suction method may also be used.

As is clear from the above description, according to the present invention, a large number of lead frames stacked in alignment can be taken out one by one starting from the lowest one, so replenishing lead frames does not require the equipment to be temporarily stopped. It is not necessary, just add more to the top, and there is no need to stop the machine.

[Brief explanation of the drawing]

Figure 1 shows one of the lead frame separation devices of the present invention.
A front view showing the embodiment, FIG. 2 is shown by arrow A- in FIG.
3 is a partial slope view of FIG. 2, FIG. 4 is a cross sectional view of the portion indicated by arrow B-B in FIG. 1, and FIG. f is an explanatory diagram of the operation, and FIG. 6 is an explanatory diagram of the clamped state by the clamp claws. 2...bottom plate, 3...side plate, 4...lead frame, 5...support claw, 8...cradle, 13...clamp claw.

Claims (1)

[Claims] 1. A guide plate for arranging and stacking a large number of lead frames, supporting claws provided on the bottom surface of this guide plate that open and close to support and open both sides of the bottom surface of the lowest lead frame, and upper and lower support claws. A pedestal that is movably provided and capable of supporting the lowest lead frame from below when rising; and a pedestal that is similarly movable vertically and that pulls down the lowest one of the lead frames when rising. A lead frame separation device equipped with a clamp claw that can be held in a similar manner.