JPS62222913A - Lead frame feeding device - Google Patents

Abstract

PURPOSE:To smoothly feed lead frames at even different temperature regions, by moving feeder pins vertically and horizontally to feed the lead frames, and making a quantity of movement of a part of the feeder pins smaller than that of the remaining feeder pins. CONSTITUTION:A feeder rod 10 is supported to a fixed bearing 9, and feeder pin holders 13 are mounted on the feeder rod 10 at predetermined intervals. Each feeder pin holder 13 is provided at its end with a feeder pin 14 projecting downwardly. In feeding lead frames 18a and 18b along guide rails 15 and 16, the feeder pins 14 are moved vertically by theta and horizontally by S. A feeder pin holder 22 in a feed correcting mechanism is moved by a slide unit 20 in association with the operation of the feeder rod 10. When the feeder pins 14 are moved horizontally by the predetermined distance S, the slide unit 20 is moved by an air cylinder 19 until the unit abuts against a stopper 21. Accordingly, it is possible to obtain the quantities S and S-V respectively suitable for the lead frames 18a and 18b in different temperature regions.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a device used to transport a lead frame, which is a packaging material, when manufacturing a semiconductor device packaged using a lead frame. .

(Prior Art) FIG. 1 is an explanatory diagram showing a conventional lead frame transfer device. In the figure, 18a and 18b are lead frames. This lead frame is attached to the guide rail 15.1.
6, a transport device as shown is used. In the figure, 10 is a feed rod. The feed rod is supported by a fixed bearing 9, and is also supported by a feed pin boulder 13.
... are installed at specified intervals. The spacing is equal to the spacing between the perforations drilled in the lead frame. Further, a feed pin 14 is provided to protrude downward from the tip of each feed pin holder. Note that, as shown by arrows in the figure, the feed pins 14 are actually arranged so as to be inserted into the feed holes from above the lead frame. The feeding operation of the illustrated feeding device will be explained as follows along with explanations of other structural parts.

That is, the feed pin 14 moves vertically and horizontally as shown by arrows 1 to 2 in the figure to transfer the frame.

Motor 1 is the driving source for this purpose, and pulley 2 and belt 3
The camshaft 4 is rotated via. As a result, the cam 6 is rotated, and the cam lever 8 swings as shown by an arrow θ in the figure in accordance with the curve of the cam 6. Therefore, the lower end of the intermediate lever 11 connected to the cam lever 8 by a spring or the like also swings within a plane perpendicular to the camshaft 4.

As a result, the feed rod 10 to which the upper end of the intermediate lever 11 is fixed rotates about the bearing 9 as a fulcrum.

As a result, the feed pin holder 1 is fixed to the feed rod 10.
3 swings, and the feed pin 14 fixed to the tip of the feed pin holder 13 moves in the vertical direction θ'.

On the other hand, with the rotation of the camshaft 4, the horizontally moving cam 5 is simultaneously rotated, the cam lever 71 swings according to the curve of the cam 5, and its support shaft is rotated. This causes the tip of the lever 72 to swing as shown. The lever 7
2 is connected to a joint 12 fixed to the feed rod 10, so that the feed rod 10 moves horizontally along the bearing 9. Therefore, the feed pin holder 13 and the feed pin 15 fixed to the feed rod 10 are moved in the horizontal direction S.

Next, the timing of the two movements will be explained. First, the feed pin 14 is inserted into the feed hole of the frame to be transferred (arrow ■), and then the frame is moved horizontally (arrow ■). This moves the frame horizontally by pitch S. Next, remove the feed pin from the frame's feed hole (arrow ■) and return to its original position (■).

By repeating this operation, the frame is sequentially transferred to the right side in the figure.

(Problems to be Solved by the Invention) If the lead frame is transferred in a state where the excitation temperature does not change much, no problem will occur with the above-mentioned conventional transfer device. However, when the frame is transferred through two different ambient temperatures, the length of the frame will differ depending on the ambient temperature due to the difference in thermal expansion, resulting in the following problem. That is, in the conventional transfer device, since the amount of transfer is the same, if the feed pitch is set to one side, the feed pin will be shifted from the center of the feed hole of the frame on the other hand.

For example, a frame 18a riding on a transfer guide rail 15 heated to 300° C. by a cartridge heater 17;
Frame 1 resting on transfer guide rail 16 at room temperature
8b, the transfer amount S differs depending on the temperature difference. The difference in length (elongation) ■ is given by the following formula using the linear expansion formula.

V=S conflict αφt ■; Elongation S: Transfer amount (distance between sprocket holes) α; Coefficient of linear expansion t; Temperature difference If the frame material is copper, α-17X10-", assuming room temperature is 25°C, t- 300-25=275℃,
Therefore, when the transfer amount S is -60, the elongation V is approximately 0.
28. becomes. Due to this amount of elongation, the centers of the frame's feed hole and feed pin become misaligned, making it impossible to insert them smoothly.

In view of the above circumstances, the object of the present invention is to provide an apparatus that can smoothly transfer frames even when transferring frames under two different atmospheric temperatures.

[Structure of the Invention] (Means for Solving the WJ Problem) A transfer device according to the present invention includes a plurality of feed pins for transferring a lead frame, a mechanism for moving these feed pins vertically and horizontally, The present invention is characterized in that it includes a mechanism that makes the amount of horizontal movement of some of the feed pins smaller by a predetermined amount than the amount of horizontal movement of other feed pins.

(Function) As described above, in the transfer device of the present invention, the amount of movement of some of the feed pins can be adjusted to be smaller than that of other feed pins, so it is possible to In addition, the frame can be transferred smoothly even when the interval between the sending holes of the frame changes depending on the ambient temperature.

(Embodiment) FIG. 2 is an explanatory diagram showing a lead frame transfer device according to an embodiment of the present invention. In this embodiment, a transfer amount correction mechanism driven by a cylinder is added to the conventional device shown in FIG. 2. This correction mechanism will be explained as follows.

The feed correction mechanism is attached to the feed rod 10.

Reference numeral 19 denotes an air cylinder, which moves the slide unit 20 in the direction in which the lead frame is transferred. A feed pin holder 22 is fixed to the slide unit, and a feed pin 23 is provided at the tip thereof to protrude downward. Further, an IN screw stopper 21 is provided to restrict the stroke of the air cylinder 19. By providing the feed correction mechanism with such a configuration, the first
The transfer device according to the illustrated embodiment operates as follows. Note that the description of operations that are the same as those of the conventional device will be omitted. In addition, the feed pitch of the feed rod 10 should be matched to the feed hole interval S in the lead frame on the high-temperature rail 15, and the distance between the slide unit 20 and the stopper 21 should be the required correction distance ■. do.

First, since the feed pin holder 22 is connected to the feed rod 10 via the slide unit 20, it moves in the horizontal direction S and in the vertical direction θ' by the movement of the feed rod 10 described for the conventional device.

At this time, the feed pin 23 is inserted into the frame feed hole (arrow ■), then horizontal movement S (arrow ■) is started, and while the movement is finished, the air cylinder 19 operates and the slide unit 20 The stopper 21
Move it until it touches. Therefore, when moving this arrow ■, the moving distance of the slide unit 20 (-feeding pin 2
) is shorter than the moving distance S of the feed rod 10 by ■. That is, the feed pin 14 that transfers the lead frame in the high temperature area moves by a distance S, and the feed pin 23 that transfers the lead frame in the low temperature area moves by a distance SV. In this way, an appropriate transfer amount can be obtained in consideration of the difference in thermal expansion.

In addition, after the above-mentioned feeding operation is completed, the feeding pin 23 is removed from the frame 18b (arrow ■), and the air cylinder 19 operates and the slide unit 20 and The space between the stoppers 21 is separated by ■ and returns to its original state.

By repeating this operation, the feed pin 23 attached to the feed correction mechanism and the feed pin 14 attached directly to the feed rod 10 can each adjust different feed amounts to the frame, taking into account the difference in length due to thermal expansion. 18a, 18b. As a result, as mentioned above, the guide rail 1
When the copper lead frames 18a and 18b were transferred with the temperature of the copper lead frames 18a and 18b set at 300°C and the guide rail 16 at room temperature, v=
By setting the feed hole to 281 m, the center of the feed hole of the frame and the feed pin always match, allowing smooth insertion and transfer.

[Effects of the Invention] As detailed above, according to the lead frame transfer device of the present invention, even when transferring under two different atmospheric temperatures, the feed holes and feed pins of the frame always align with each other. Remarkable effects such as being able to transport frames smoothly can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a lead frame transfer device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional lead frame transfer device.

Claims (1)

[Claims] multiple feed pins for transferring the lead frame;
It is characterized by comprising a mechanism for moving these feed pins vertically and horizontally, and a mechanism for making the amount of horizontal movement of some of the feed pins smaller by a predetermined amount than the amount of horizontal movement of other feed pins. Lead frame transfer device.