JPH08621B2 - Carrier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a transfer device for picking up and transferring works stored in multiple stages in a magazine.

(Prior Art) For example, in the manufacture of a semiconductor device, since electrodes on a semiconductor chip after a wafer process are drawn out to be leads of a package, die bonding for fixing the semiconductor chip to a lead frame, electrodes and leads on the chip Wire bonding for wiring the leads of the frame, resin sealing for forming a package with resin, and the like are performed. Since the lead frame as a work is manufactured as a unit between these steps and steps, it is important to convey the lead frame.

FIG. 5 shows a part of a carrying device for carrying the lead frames in the wire bonding process, in which the lead frames 2 housed in the magazine 1 are pulled out one by one by the feed claws 3 and the guide rails 4 are fed. It is housed in another empty magazine 5 mounted on the other end of the guide rail 4 carried by the further feed pawls 3 ', 3 ". These magazines 1 and 5 are magazine elevators 6 and The magazine elevators 6 and 7 are mounted on the sliding shaft 12 by the lead screws 10 and 11 driven by the rotation of the motors 8 and 9, respectively.
And up and down along 13, 14 and 15. In addition, the guide rail 4
A wire bonding device 16 is provided at the center of the wire bonding device 16, and when the arm 17 moves, the die-bonded semiconductor chip 18 of the lead frame 2 therebelow is provided.
A wire 19 is laid between the electrode of and the lead of the lead frame 2.

Here, the guide rail 4, the magazine elevator 6,
7, the feed pawl 3, a drive mechanism for the feed pawl (not shown), and the like constitute a transfer device for the lead frame 2.

By the way, the lead frame 2 is formed with a positioning hole 2a and a feed hole 2b as shown in FIG. 6, and the feed pawls 3 and 3'engage with the feed hole 2b so that the lead frame 2 is Taken out from magazine 1.

However, since the shape and position of the feed claw 2b varies depending on the type of the lead frame 2, when the type is changed, the feed claws 3 and 3'can be replaced with those corresponding to the shape of the feed hole 2b. There was a problem that the mounting position had to be adjusted.

(Problems to be Solved by the Invention) An object of the present invention is to provide a transporting device that does not require replacement of parts or various adjustments when the type of work is changed.

[Structure of the Invention] (Means and Actions for Solving Problems) The present invention relates to a transfer device for taking out a work from a magazine in which a work is stored in a plurality of stages and has a take-out opening on one end side. A drive mechanism for moving up and down along a guide, and a take-out mechanism arranged at a predetermined position of the guide so as to face the take-out opening of the magazine and take out the work stored in the magazine by sandwiching it. The take-out mechanism includes a slide body that is driven in a direction in which the magazine moves toward and away from the magazine, a base end portion of the slide body that is rotatably attached to the slide body, and that extends in the thickness direction of the work stored in the magazine. And a pair of tongues spaced apart in parallel with each other, a drive means for rotationally driving one of the pair of tongues, and a pair of tongues provided at the base end portions of the tongues meshed with each other. Wherein the that one of the other tongue based on rotation of the tongue equipped with a power transmission mechanism for interlocking on one tongue above.

Further, the work can be transported without changing or adjusting parts according to the type of work.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. The transport device shown in FIG. 4 has a magazine elevator 21. A magazine 23 containing a lead frame 22 as a work is placed on the magazine elevator 21. In addition, the magazine elevator 21 has a motor 24
Rotation of the lead screw 25 causes the sliding shafts 26, 27 to rotate.
It is designed to be driven up and down along. The magazine 23 is open at both ends and has a take-out opening 23a at one end.

A pair of frames facing the magazine elevator 21
28 are provided. Guide rails 29 are laid on the upper ends of the frames 28, respectively. Further, between the magazine elevator 21 and the frame 28, the take-out opening portion of the magazine 23 is provided at a predetermined position along the sliding shafts 26, 27.
An ejecting mechanism 31, which will be described later, is provided so as to oppose the lead frame 22 in the magazine 23.
Are to be taken out.

As shown in FIGS. 1 to 3, the take-out mechanism 31 has a pair of guide shafts 32, one end of which is fixed to one end surface of the frame 28, and which are provided in parallel with each other in the vertical direction. A slide body 33 is slidably supported on these guide shafts 32. At the upper part of the slide body 33, the first support shaft 34
And the second support shaft 35 are rotatably supported. A first holding member 36 is fitted on the first support shaft 34, and a second holding member 37 is fitted on the second support shaft 35. A first tongue piece facing each other at a predetermined distance from the holding members 36 and 37.
38 and the second tongue piece 39 extend substantially horizontally toward the magazine 23. In addition, the second located below
From the holding member 37, an operating piece 41, which is substantially perpendicular to the second tongue piece 39, extends downward.

A first gear 42 and a second gear 43 meshing with each other are fitted to the other ends of the first support shaft 34 and the second support shaft 35, respectively. Further, at the lower end of the slide body 33, a first air cylinder 45 is provided with a rod 44 facing one side surface of the end of the actuating piece 41. Further, a spring 46 is provided on the other side surface of the operating piece 41 so as to bias the one side surface of the operating piece 41 in a direction in which the operating piece 41 abuts the rod 44. Therefore, when the first air cylinder 45 is actuated to urge the rod 44 in the projecting direction and the actuating piece 41 is pressed, the second holding member 37, together with the second support shaft 35, moves as shown in FIG. It rotates in the direction of arrow a shown in. Then, the first holding member 36 rotates in the direction of the arrow b, which is the opposite direction of the arrow a, via the pair of gears 42 and 43, so that the first and second tongues 38 and 39 are closed. .

A second air cylinder 47 is attached to the side surface of the one frame 28 by an attachment piece 48 with its axis parallel to the moving direction of the slide body 33. This second
The rod 47a of the air cylinder 47 is connected to the slide body 33 by a connecting piece 49. Therefore, the slide body 33 is driven by the second air cylinder 47 along the pair of guide shafts 32 as shown by the arrow c in FIG. That is, the slide body 33 is adapted to be driven in a direction of approaching and separating from the magazine elevator 21.

A drive roller 53, which is driven to rotate by a motor 52 via a belt 51, and a driven roller 54, which is displaceable in a direction in which the drive roller 53 is moved toward and away from the drive roller 53, are provided at the tip of the frame 28. The tongues 38 and 39 are arranged at almost the same height. The driven roller 54 is usually the drive roller described above.
When the lead frame 22 is separated from the magazine 23 by the extraction mechanism 31 as described later, the lead frame 22 is driven in the direction of rolling contact with the drive roller 53, and the upper and lower surfaces of the lead frame 22 are paired. The rollers 53 and 54 are sandwiched and conveyed. These pair of rollers 53, 54
The lead frame 22 conveyed by is fed to the guide rail 29, and is pitch-fed along the guide rail 29 by a feed mechanism (not shown). Further, a wire bonding device 55 is provided at the center of the guide rail 29, and when the arm 56 moves, the electrodes of the semiconductor chip 57 die-bonded to the lead frame 22 below and the lead frame 22 are provided. A wire 58 is arranged between the leads.

Next, an operation when the lead frame 22 is transported from the magazine 23 by the transport device having the above structure will be described. First, the motor 23 drives the magazine 23 via the lead screw 25, and the lead frame in the magazine 23 is driven.
When 22 almost matches the height of the transport surface of the guide rail 29,
The second air cylinder 47 operates to urge the rod 47a in the projecting direction, and the slide body 33 of the take-out mechanism 31 advances toward the magazine 23 as shown by the chain line in FIG. Then, the one end of the lead frame 22 is inserted between the tongue pieces 38, 39 of the pair of holding members 36, 37 in the open state. Next, the first air cylinder 45 is actuated to urge the pair of tongues 38 and 39 in the closing direction, and the ends of the lead frame 22 are clamped by the tongues 38 and 39.

Since the pair of tongue pieces 38, 39 extend horizontally (parallel), the distance between them may be slightly larger than the thickness of the lead frame 22. That is, a pair of tongues 38, 39
The interval can be reduced. As a result, the intervals between the lead frames 22 housed in multiple stages in the magazine 23 can also be made smaller, so that the lead frames 22 that can be housed in one magazine 23
It is possible to increase the number of sheets.

If the number of lead frames 22 that can be stored in the magazine 23 can be increased, the number of times the magazine 23 can be replaced can be reduced,
The productivity can be improved accordingly.

When the second tongue piece 39 is rotated by the first air cylinder 45, the first gear 42 and the second gear 42 meshed with each other.
The rotation of the gear 43 is surely transmitted to the first tongue piece 38. That is, the pair of tongue pieces 38 and 39 are mechanically interlocked to rotate.

Therefore, a pair of tongues 38 and 39 are used to form the lead frame.
The lead frame 22 can be reliably transported because the 22 can be reliably clamped and the clamped state does not loosen during transportation.

When the pair of tongues sandwich the one end of the lead frame 22 as described above, the bias of the second air cylinder 47 is released, and the slide body 33 retracts together with the lead frame 22. When the slide body 33 moves backward, the lead frame
One end of 22 is positioned on the driving roller 53, and the driven roller 54 is driven in the closing direction, and the lead frame 22 is nipped by the pair of rollers 53, 54. Further, when the lead frame 22 is clamped, the biasing force of the first cylinder 45 is released, the clamped state of the lead frame 22 by the pair of tongues 38, 39 is released, and the drive roller 53 causes the motor 52 to move.
Driven by, the lead frame 22 is sent to the conveying surface of the guide rail 29. Then the lead frame
22 is pitch-fed by a feeding mechanism (not shown) and wire-bonded by the wire-bonding device 55.

That is, according to the transport device having the above-described configuration, the lead frame
Since the pair of holding members 36 and 37 of the take-out mechanism 31 sandwiches the tongue pieces 38 and 39 from the thickness direction of the take-out mechanism 31 and takes out and conveys it from the magazine 23, the shape of the lead frame 22 can be changed by changing the type of product. Even if the above are different, the lead frame 22 can be taken out from the magazine 23 without particularly changing parts or making various adjustments.

[Effects of the Invention] As described above, according to the present invention, the work housed in the magazine is picked up by the holding mechanism from the thickness direction. Therefore, it is necessary to change the feed pawl to a different one each time the type of the work is changed, or to perform various adjustments, by engaging the feed pawl formed in the work with the feed pawl to convey the work. Therefore, productivity can be improved at the time of product exchange.

Further, since the pair of tongues of the take-out mechanism are separated from each other in parallel, the distance between the pair of tongues need only be slightly larger than the thickness of the work. That is, the distance between the pair of tongue pieces can be reduced. As a result, it is possible to reduce the interval between the works stored in the magazine in multiple stages.
The number of works that can be stored in one magazine can be increased, the number of magazine replacements can be reduced, and productivity can be improved.

Furthermore, since the rotation of one tongue piece is transmitted to the other tongue piece by the pair of gears meshed with each other, the pair of tongue pieces can be driven reliably. As a result, not only the work can be reliably clamped, but also the work can be reliably transported since the work is not clamped during the transportation.

[Brief description of drawings]

FIG. 1 is an enlarged side view of an essential part showing an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. FIG. 5 is a schematic perspective view of a conventional device, and FIG. 6 is a plan view of a lead frame. 22 …… Lead frame, 23 …… Magazine, 24 …… Motor, 25 …… Lead screw, 26, 27 …… Sliding shaft, 31…
… Ejecting mechanism, 36,37 …… Clamping member, 38,39 …… Tongue.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keitaro Okano 8 Shinshinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Inside the Toshiba Industrial Research Institute Co., Ltd. (56) Reference JP 60-259351 (JP, A)

Claims (1)

[Claims] 1. A transporting device for taking out the work from a magazine in which the work is stored in a plurality of stages and has an take-out opening at one end side, and a drive mechanism for vertically moving the magazine along a guide, and a predetermined guide. And a take-out mechanism arranged to face the take-out opening portion of the magazine at a position for picking up and picking up the work stored in the magazine, and the take-out mechanism is driven in a direction to approach and separate from the magazine. A slide body, and a pair of tongue pieces whose base ends are rotatably attached to the slide body and are spaced apart in parallel along the thickness direction of the work stored in the magazine; Drive means for rotationally driving one of the tongues, and the other tongue on the basis of the rotation of the one tongue provided by the driving means provided at the base ends of the tongues. tongue And a power transmission mechanism that is interlocked with one side.