JPH04252039A - Pushing-out mechanism of lead frame - Google Patents

Abstract

PURPOSE:To universally comply with various sheet lengths of lead frames housed in a magazine and to constitute the title mechanism so as to be small- sized. CONSTITUTION:A pushing-out mechanism 1 is arranged and installed at the back of a magazine carrying-in device 3 which moves a magazine 2 intermittently upward and downward; a plurality of sheets of lead frames 4 housed in the magazine 2 are pushed out one by one. At the pushing-out mechanism 1, a buffer and fitting plate 1a is fixed and bonded to one end part, and the other end part is constituted of a belt-shaped elastic member 1c which has been wound on a winding means 1b. The buffer and fitting plate 1a is advanced and retreated by following the forward rotation and reverse rotation of the winding means 1b. When the buffer and fitting plate 1a is advanced and inserted from the back of the magazine 2, the lead frames 4 are pushed out forward.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame extrusion mechanism, and more particularly, to an extrusion mechanism that is versatile enough to accommodate various changes in the length of one sheet of a lead frame.

[0002] In recent years, with the progress of semiconductor devices centered on semiconductor integrated circuits, rationalization of the manufacturing process has been vigorously promoted, and the various transportation processes performed at various points in the manufacturing process are also an important issue for rationalization. It has become one of the In other words, how to efficiently carry out various types of transportation in a series of semiconductor device manufacturing processes has become an essential issue in order to improve yield, quality, and reduce costs in processes that greatly affect productivity.

0003

2. Description of the Related Art In the manufacturing process of semiconductor devices, for example, silicon wafers in a wafer process, chips after pattern formation and scribing, or chips that are die-bonded and wire-bonded are processed. Lead frames and the like are often transported between various manufacturing devices.

Lead frames are often used, especially in resin-sealed semiconductor devices, and are handled by being stored in a storage jig called a magazine. This magazine has multiple shelves, and multiple sheets of lead frames are stored in the shelves.For example, a die bonder that fixes a chip to a lead frame, a wire bonder that connects a chip and a lead frame with a thin wire, etc. The lead frame is transported between various devices such as bench stands that set the lead frame on the loading frame. One side of these devices is equipped with a magazine loading device, and the other side is equipped with a magazine unloading device. Magazines are set in these loading/unloading devices, and lead frames are fed into and taken out of various devices. It is supposed to be done.

This magazine loading/unloading device is provided with an elevating mechanism that moves up and down intermittently in accordance with the intervals between the shelves in which the lead frames are stored. The magazine loading device attached to the side that feeds the lead frame into the device is equipped with an extrusion mechanism called a pusher.
The lead frame is pushed out one sheet at a time into the device.

FIG. 4 is a block diagram of an example of a conventional lead frame extrusion mechanism. In the figure, 1 is an extrusion mechanism, 1f
1g is a drive means, 2 is a magazine, 2a is a shelf, 3 is a magazine carrying device, 4 is a lead frame, and 5 is a lead frame conveying device.

The lead frame 4 has various shapes depending on the process. That is, the chip may be in a bare state, the chip may be die-bonded, or the chip may be wire-bonded. and,
For example, 10 pieces are not cut into pieces one by one.
It is handled in units of sheets that are cut into lengths that are made up of multiple pieces, such as 1 or 15 pieces.

[0008] Furthermore, the lead frame 4 has 10 stages or 2 stages.
They are stored and handled in a magazine 2, which is a storage jig with a shelf 2a of 0 or so tiers. This magazine 2 is set on a magazine conveying device attached to various manufacturing equipment and placed on a shelf 2.
The lead frame 4 is fed into or taken out of the manufacturing equipment while being raised or lowered in accordance with the interval a.

On the other hand, an extrusion mechanism 1 is provided in front of a magazine loading device 3 that is attached to the side that feeds the lead frame 4 into various manufacturing devices. This extrusion mechanism 1 is provided with a pusher plate 1f, which is configured to move forward and backward in the horizontal direction by a driving means 1g such as an air cylinder, for example. When the magazine 2 moves up and down intermittently one step at a time according to the spacing between the shelves 2a, the pusher plate 1f moves forward and backward from the back of the magazine 2, pushing out the lead frame 4 one sheet at a time. It has become. The lead frame 4 extruded in this way is
Riding on the lead frame transport device 5 provided at the rear,
For example, it is sent into various manufacturing equipment such as a die bonder or a wire bonder.

0010

[Problems to be Solved by the Invention] As described above, the conventional lead frame extrusion mechanism is configured to push the lead frame one sheet at a time from the magazine into the device by moving the pusher plate forward and backward. .

By the way, lead frames are handled in sheets, but the number and arrangement of leads vary depending on the type of chip to be die-bonded, so the length of one sheet of lead frames varies depending on the type of chip. It's getting dark.

[0012] Therefore, in the conventional lead frame extrusion mechanism, the pusher plate needs to be replaced and adjusted every time the length of one sheet of lead frame changes, which is a complicated operation, and the mechanism lacks versatility. Furthermore, since the pusher plate protrudes from the back side of the magazine when it retreats, there is a drawback that the mechanism becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact ejecting mechanism that is versatile enough to accommodate various lead frame sheet lengths and does not protrude significantly from the back of the magazine.

[0014]

[Means for Solving the Problems] The problem described above is to solve the problems described above by disposing a magazine loading device that intermittently raises or lowers a magazine, and converting multiple sheets of lead frames stored in the magazine into one sheet. A lead frame extrusion mechanism for extruding a lead frame piece by piece, comprising an elastic member, the elastic member having a band shape and having one end fixed to a plywood plate,
The other end of the elastic member is wound around the winding means, and moves the colliding plywood forward and backward by following the forward and reverse rotation of the winding means, and the elastic member The problem is solved by a lead frame ejection mechanism configured to push the lead frame forward when the lead frame is advanced and inserted from the back side of the magazine.

[0015]

[Function] In the conventional lead frame extrusion mechanism, it was necessary to replace the pusher plate according to the length of one sheet of the lead frame, and the mechanism was large, but with the present invention, there is no need to replace the pusher plate. It is also compatible with lead frames of various sheet lengths.

That is, the other end of a band-shaped elastic member provided with an abutment plate at one end is wound around a winding means, and
The elastic member is let out or rolled in. Then, the plywood is moved forward or backward into the magazine in which the lead frame is housed. The moving distance by which this plywood moves forward and backward is set in advance according to the sheet length of the lead frame.

[0017] When the abutment plate moves forward, the abutment plate collides with the lead frame and pushes the lead frame out of the magazine, and when the abutment plate moves backward, the abutment plate is stored in the next shelf. The magazine is raised or lowered one step so that it faces the lead frame. By repeating this operation, the lead frames can be sequentially pushed out one sheet at a time from the magazine into the apparatus.

Furthermore, since the elastic member is configured to be wound around the winding means, there is no need to insert and remove a pusher plate with a length commensurate with the sheet length of the lead frame, as in the conventional case, so the extrusion mechanism can be made smaller. It can be configured as follows.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view of one embodiment of the present invention, FIG. 2 is a side view of another embodiment of the present invention, and FIG. 3 is a flow chart explaining the operation of FIG. In the figure, 1 is an extrusion mechanism, 1a is an abutment plate, 1b is a winding means, 1c is an elastic member,
1d is a guide member, 1e is a stepping motor, 2 is a magazine, 2a is a shelf, 3 is a magazine loading device, 4 is a lead frame, 5 is a lead frame transport device, and 6 is a detection means.

Embodiment 1 In FIG. 1, an extrusion mechanism 1 is disposed behind a magazine loading device 3. As shown in FIG. The magazine 2 is set in the magazine loading device 3. Incidentally, the magazine 2 is provided with a plurality of shelves 2a, and a plurality of lead frames 4 are stored in the shelves 2a. This magazine 2 is intermittently raised or lowered by a magazine loading device 3 in accordance with the intervals between the shelves 2a of the magazine 2. When the magazine 2 stops at a predetermined position, the extrusion mechanism 1 is activated to extrude the lead frame 4 one sheet at a time.

The extrusion mechanism 1 is composed of a band-shaped elastic member 1c having an abutment plate 1a fixed to one end and wound around a winding means 1b at the other end. For the elastic member 1c, for example, a metal coil spring or a thin plate of plastic made of polyester reinforced with glass fiber to give it springiness is used, which is shaped so that it becomes flat when unwound. I can do that. When the winding means 1b rotates forward to unwind the elastic member 1c or rotates backward to wind up the elastic member 1c, the abutment plate 1a provided at one end moves forward or backward. It has become.

When the elastic member 1c is unwound, the abutting plate 1a projects along the guide member 1d and is inserted into a shelf 2a provided in the magazine 2 from the back side of the magazine 2. and,
It collides with the lead frame 4 stored on the shelf 2a and pushes out the lead frame 4. The extruded lead frame 4 is conveyed to various manufacturing devices on a lead frame conveying device 5.

On the other hand, when the lead frame 4 is pushed out to a predetermined position, the elastic member 1c is wound up by the winding means 1b, and the abutment plate 1a retreats and returns to its original position. Then, when the magazine carrying device 3 rises or falls and the magazine 2 advances one step, the operation of advancing the abutment plate 1a is repeated again.

The length by which the elastic member 1c is unwound or wound, that is, the distance by which the abutment plate 1a is advanced or retreated, can be set in advance by the sheet length of the lead frame 4. When the winding means 1b is rotated by the stepping motor 1e, the motor 1
The number of pulses for driving e may be set.

In this way, it is possible to accommodate lead frames 4 of various sheet lengths, and since the elastic member 1c is wound up by the winding means 1b, the extrusion mechanism 1 can be made compact regardless of the sheet length of the lead frame 4. Can be done.

Embodiment 2 In FIGS. 2 and 3, in front of the magazine loading device 3,
A lead frame transport device 5 is provided. and,
The lead frame 4 pushed out from the magazine 2 by the push-out mechanism 1 is transported by a lead frame transport device 5 to various devices (not shown). Detection means 6 consisting of a sensor such as a photointerrupter detects the lead frame 4 at a predetermined position of the lead frame conveying device 5.
is provided.

The operating procedure is as follows: First, the winding means 1b rotates in the forward direction, the abutment plate 1a advances, is inserted into the back of the magazine 2, and the lead frame 4 is pushed out from the magazine 2. While the detection means 6 is detecting the lead frame 4, the abutting plate 1a continues to move forward. When the detection is completed, the winding means 1b rotates in the opposite direction, and the abutment plate 1a retreats to return to its original position. Next, the magazine loading device 3 is operated to intermittently move the magazine 2 up or down one step.

Further, if the detection means 6 does not detect the lead frame 4 even if the abutment plate 1a is advanced a predetermined distance, it is determined that the lead frame 4 is not present in the magazine 2 and the abutment plate 1a is moved forward. In addition to immediately retracting the magazine 2, the magazine carrying device 3 is operated to intermittently raise or lower the magazine 2 by one stage.

In this way, the detection means 6 can detect the lead of any sheet length without having to set in advance the distance by which the abutment plate 1a moves forward and backward according to the sheet length of the lead frame 4 as described in the first embodiment. The lead frame 4 can also be used, and if the lead frame 4 is missing from the magazine 2, it is possible to immediately move on to the next operation without wasting any waste.

As the elastic member 1c, it is also possible to use a shaped member called a so-called convex, which has a convex shape in the longitudinal direction, as seen in a tape measure, and can be rolled into a curved surface and extends linearly when unwound. Further, the series of operations of the extrusion mechanism 1 illustrated here can be sequence-controlled using, for example, a microprocessor.
Various modifications are possible.

[0031]

As described above, according to the extrusion mechanism of the present invention, it is possible to universally handle various sheet lengths of lead frames without any troublesome work.
Moreover, it can be constructed in a small size. As a result, the process of transporting lead frames into various manufacturing devices in various manufacturing processes for semiconductor devices can be carried out efficiently both in terms of work and space. Therefore, the present invention greatly contributes to improving the productivity of semiconductor devices.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention.

FIG. 2 is a side view of another embodiment of the present invention.

FIG. 3 is a flowchart explaining the operation of FIG. 2.

FIG. 4 is a configuration diagram of an example of a conventional lead frame extrusion mechanism.

[Explanation of symbols]

1 Extrusion mechanism 1a Collision plywood 1b Winding means 1c Elastic member 2 Magazine 3 Magazine carrying device 4 Lead frame 5 Lead frame conveying device 6 Detecting means

Claims (4)

[Claims] Claim 1: A plurality of lead frames (4) disposed behind a magazine carrying device (3) that intermittently raises or lowers a magazine (2) and housed in the magazine (2). A lead frame extrusion mechanism (1) for extruding sheets one by one, which includes an elastic member (1c), the elastic member (1c) having a band shape, one end fixed to the abutment plate (1a), and the other end being fixed to the abutment plate (1a). The end is the winding means (
1b), the winding means (
The elastic member (1c) moves the magazine (2) forward and backward as the abutting plate (1a) moves forward and backwards. A lead frame extrusion mechanism characterized in that when inserted from the back side of the lead frame (4), it hits the lead frame (4) and pushes it forward. 2. The lead according to claim 1, wherein when the plywood (1a) retreats and escapes from the back side of the magazine (2), the magazine loading device (3) intermittently moves up or down one step. Frame extrusion mechanism. 3. A lead frame transport device (5) disposed in front of the magazine carrying device (3) includes a detection means (6) for detecting the lead frame (4), the detection means (6) When the extruded lead frame (4) has been detected, the winding means (1b) is reversely rotated to retreat the colliding plate (1a), and the magazine loading device (3) is activated. 2. The lead frame extrusion mechanism according to claim 1, wherein the magazine (2) is intermittently raised or lowered by one step. 4. The detection means (6) is configured to detect whether the lead frame (
4) The lead frame extrusion mechanism according to claim 3, wherein the abutting plate (1a) is retracted when the above is not detected.