JPH0952603A - Extruding device for thin sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely deliver lead frames one by one without deforming them and use push rods over a long period in a thin sheet extruding device delivering the lead frames which are thin sheets liable to be warped. SOLUTION: This thin sheet extruding device is provided with a pusher constituted of two push rods 1a to be brought into contact with the vicinity of grooves 15a of a magazine 15 storing lead frames 16 while both side sections of them are inserted into the grooves 15a. A head 1 is moved along the extending direction of the grooves 15a, and the lead frames 16 are extruded from the magazine 15 by the push rods 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plate pushing device for pushing a thin plate such as a lead frame stored in a magazine which is a storage box out of the magazine, and more particularly to a thin plate pushing device for pushing a thin plate which is easily bent by its own weight.

[0002]

2. Description of the Related Art Generally, in a semiconductor device assembly process, a die mounting process, a wire bonding process, and a resin sealing process are performed by arranging mounting surfaces on which a plurality of semiconductor chips are mounted side by side in one direction. A long lead frame is used as a standard component. Further, this thin plate extrusion device has been used as a means for supplying a lead frame to each device in each process.

FIG. 5 is a perspective view of a conventional thin plate extrusion device. Conventionally, a thin plate extrusion device of this type is disclosed as a conventional technique in, for example, Japanese Patent Application Laid-Open No. 3165528. As shown in FIG. 5, this device has an opening in the front and the rear which is a storage box and has an elevator mechanism 14
It is equipped with one rod-shaped pusher 12 for pushing out the lead frame 16 from the magazine 15 placed on, and a head 11 for mounting the pusher 12 and slidingly guided by the guide bar 13.

When the lead frame is sent to the stage of the apparatus by this thin plate pushing apparatus, first, the magazine 15 is raised or lowered by one pitch by the elevator mechanism 14 and the position between the tip of the pusher 12 and the one end surface of the lead frame. Then, the pusher 12 is moved forward so that the flat end face of the pusher 12 is brought into contact with the end portion of the lead frame 16, and the pusher 12 is pushed to push the lead frame 16
Was pushed out of the magazine 15 and the lead frame 16 was sent to the stage of the apparatus as shown by the chain double-dashed line.

[0005]

However, in recent years,
The material of the lead frame is shifting from iron-based alloys to copper or copper alloys in order to achieve lower resistance. When the above-described conventional thin plate extrusion device is applied to a lead frame made of such a low-rigidity material, the following problems occur.

FIG. 6 is a view showing an opening of a magazine for explaining one problem of a conventional thin plate pushing apparatus. Now, assuming that the lead frame 16 having low rigidity is housed in the magazine 15, as shown in FIG.
The central portion of the lead frame 16 is largely bent like a beam having a as a free end. For this reason, the pusher 12 advanced from the normal position may pass above or below the lead frame 16 and not come into contact therewith. As a result, the lead frame 1
It becomes impossible to send 6. Further, in order to prevent this, for example, as disclosed in Japanese Patent Laid-Open No. 21246347, there is a possibility that two lead frames 16 may be pushed out even if the pusher 12a having a wide width is pushed out. It cannot be resolved.

FIGS. 7 (a) to 7 (d) are views showing a pusher and a lead frame for explaining another problem of the conventional thin plate pushing apparatus. In addition, such a lead frame having low rigidity is easily deformed, and for example, even if the position where the lead frame 16 is pushed is slightly deviated as shown in FIG. ) To FIG. 6 (c)
The lead frame 16 is deformed as shown in FIG.
The tip of 6 is bent and cannot be pushed out. Further, while such uncertain contact of the pusher 12 with the lead frame is repeated, the pusher 12 eventually wears and becomes unusable in a short period of time.

Therefore, an object of the present invention is to insert the both side portions into the grooves formed in multiple stages in the magazine and surely push out the strip-shaped thin plates stored one by one without deforming the strip-shaped thin plates. It is to provide an extrusion device.

[0009]

A feature of the present invention is that a strip-shaped thin plate member is housed in a storage box in which both ends are inserted into grooves formed in inner wall surfaces on both sides of the storage box having front and rear openings. In a thin plate extrusion device having a push-out means for pushing out from the opening on the front surface to the opening on the rear surface, the push-out means is a two-push rod member that pushes a portion of the thin plate member in the vicinity of the grooves on both sides. It is an extrusion device. Further, it is preferable that an R-shaped or V-shaped recess into which the end portion of the push rod member contacts the end portion of the thin plate is formed.

Another feature of the present invention is that the pushing means is a plate-shaped push rod member that pushes into the grooves on both sides of the storage box and pushes out the thin plate, and is close to the opening on the front surface of the storage box. And a guide mechanism provided with a guide portion for arranging a discharge port for discharging the plate-shaped push rod member and having a guide portion that is connected to the discharge port and on which the plate-shaped push rod member slides. is there.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIGS. 1A and 1B are a perspective view of a thin plate pushing device and a front view of an opening of a magazine for explaining an embodiment of the present invention. As shown in FIG. 1, this thin plate pushing device is provided with two push rods 1a that push the portions of the lead frame 16 near the grooves 15a on both sides of the magazine 15.

Further, as shown in FIG. 1 (a), the head 1 for attaching the two pushing push rods 1a is mounted in the same manner as in the conventional case.
A guide bar 3 that linearly guides the head 1 so that the two push rods 1a move in a direction parallel to the extending direction of the groove 15a; and a head moving mechanism that moves the head 1.
An elevator mechanism 14 for moving the magazine 15 up and down at intervals between the grooves 15a is provided.

If these two push rods 1a are positioned near the groove 15a of the magazine 15 in which the lead frame 16 has the smallest bending, as shown in FIG. 1 (b), the tip of the push rod 1a will be It can come into contact with the lead frame 16 and be pushed out of the magazine 15 reliably. In addition, push rod 1
If the thickness of the front end surface of a is smaller than the distance between the grooves 15a, the two lead frames 16 are not extruded by one extrusion unlike the conventional case. As a result, there was no feed error that was 25% in the past.

2A to 2C are views showing a lead frame and a push rod for explaining a modified example of the push rod of FIG. As shown in FIG. 2A, the push rod 1b has an R-shaped recess 4 formed at the tip of the push rod 1b.
By providing the spherical recess 4, even if the push rod 1b and the lead frame 16 are misaligned as shown in FIG. 2A, the lead frame 16 is automatically centered as shown in FIG. 2B. The end portion of is followed by the R-shaped recess 4 and is brought close to the center of the push rod 1b. The lead frame 16 is smoothly extruded without causing deformation.

Further, even if the tip portion of the push rod 1b is worn out repeatedly, the wear state explained in the section of the problem is different and the shape of the recess is a new recess 4a similar to the recess of FIG. 2 (a). It can withstand long-term use. Of course, the shape of the recess is not a R-shaped recess as shown in FIG. 2A, but a V-shaped recess that is easy to manufacture, and wear progresses during repeated use, resulting in an R-shaped recess.

FIGS. 3A and 3B are plan views showing two kinds of thin lead frames. As shown in FIG. 3, there are thin lead frames having a vertical frame 17a and one having no vertical frame 17a. As shown in FIG. 3A, the lead frame applied to the thin plate extrusion device according to the embodiment of the invention described above has a vertical frame 17a. In order to apply to a lead frame having only the horizontal frame 17b without the vertical frame 17b as shown in FIG. 3B, it is necessary to provide a thin plate extrusion device of another embodiment.

4 (a) and 4 (b) are a partially cutaway side view of a thin plate pushing device and a front view of an opening of a magazine for explaining another embodiment of the present invention. As shown in FIG. 4, the thin plate extrusion device applied to the lead frame having no vertical frame described above has a groove 1 on both sides of the magazine 15.
5, two plate-shaped push rods 1c that push the lead frame 16a out of the opening 15c on the rear side of the magazine 15.
And a discharge port 6 for discharging the plate-shaped push rod 1c arranged close to the opening 15b on the front surface of the magazine 15, and a guide portion 7 connected to the discharge port 6 for sliding the plate-shaped push rod 1c. And a guide 5 to do so.

Other than the above, the head 1 for mounting the plate-shaped push rod 1c, the guide bar 3 for guiding the movement of the head 1, and the head for moving the head 1 are the same as those of the thin plate pushing apparatus in the above-described embodiment of the invention. The moving mechanism 2 and the elevator mechanism 14 are provided.

As shown in FIG. 4B, the two plate-shaped push rods 1c are inserted through the openings 15b of the magazine 15 and the lead frame 16a is inserted into the magazine while being guided by the push grooves 15a at both ends of the lead frame. Opening 15c after 15
Push out from. In addition, the push rod 1c has a groove 15
It is slightly thicker than the thickness of the lead frame 16 because it is loosely fitted to a. Therefore, the guide 5 is supported by the guide 5 in front of the opening of the magazine 15 so that the tip of the moving push rod 1c does not enter the bending groove 15a.

In this way, by pushing the sputum on both sides of the lead frame 16a having mechanical strength, the lead frame 1
The 6a can be extruded without being deformed. Further, the misalignment of the tip of the lazy spinning cloth 1c due to Tawami can be eliminated by providing the guide. The thin plate extrusion device of this embodiment is advantageous in that it can be applied to all lead frames regardless of the presence or absence of a vertical frame without the need to form R or V grooves on the end surface of the push rod as a pusher as described above. There is.

[0022]

As described above, according to the present invention, the pusher constituted by two push rods that come into contact with the both ends of the lead frame inserted in the groove of the magazine only in the vicinity of the groove or in the groove is provided. In addition, in the case of pusher push rods that easily bend, by providing guide support materials to prevent bending so as not to bend, it is possible to reliably feed the lead frames, which are thin plates, one by one from the magazine. The effect of being able to do is obtained. Further, depending on the push rod of the pusher, the R or V groove is provided on the end face of the push rod, so that the lead frame can be prevented from being deformed due to the positional deviation between the pusher and the lead frame.

[Brief description of drawings]

FIG. 1 is a perspective view of a thin plate pushing device and a front view of an opening of a magazine for explaining an embodiment of the present invention.

FIG. 2 is a diagram showing a lead frame and a push rod for explaining a modified example of the push rod of FIG.

FIG. 3 is a plan view showing two types of thin lead frames.

FIG. 4 is a partially cutaway side view of a thin plate pushing device and a front view of an opening of a magazine for explaining another embodiment of the present invention.

FIG. 5 is a perspective view of a thin-plate pushing device showing an example of the related art.

FIG. 6 is a diagram showing an opening of a magazine for explaining one problem of a conventional thin plate pushing device.

FIG. 7 is a diagram showing a pusher and a lead frame for explaining another problem of the conventional thin plate extrusion device.

[Explanation of symbols]

 1,11 Heads 1a, 1b, 1c Push rod 2 Bed moving mechanism 3,13 Guide bar 4 R-shaped recess 4a New recess 5 Guide 6 Discharge port 7 Guide part 12, 12a Pusher 14 Elevator mechanism 15 Magazine 15a Groove 15b, 15c Opening 16,16a Lead frame 17a Vertical frame 17b Horizontal frame

Claims (3)

[Claims] 1. A strip-shaped thin plate member having both end portions inserted into grooves formed in inner wall surfaces on both sides of a storage box having front and rear openings and accommodated in the storage box from the front opening to the rear opening. A thin-plate pushing device comprising a pushing-out device for pushing the thin plate, wherein the pushing-out device is two push rod members for pushing the portions of the thin plate member in the vicinity of the grooves on both sides. 2. The extruding of a thin plate according to claim 1, wherein an R-shaped or V-shaped recess into which the end of the push rod member contacts the end of the thin plate is formed. apparatus. 3. The plate-shaped push-bar member, wherein the pushing-out means is a plate-shaped push-bar member that enters the grooves on both sides of the storage box and pushes out the thin plate, and is close to the opening on the front surface of the storage box. And a guide mechanism provided with a guide portion for arranging a discharge port for discharging the sheet, the guide unit being connected to the discharge port and on which the plate-shaped push rod member slides.