JP3309199B2 - Lead frame supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sequentially supplying lead frames loaded on a cassette one by one, and more particularly to an apparatus capable of supporting various kinds of lead frames and cassettes.

[0002]

2. Description of the Related Art FIG. 11 shows a conventional lead frame 2 supply device.

[0005] A large number of lead frames 2 are stacked on a cassette 3 to be fully loaded. FIG. 11 shows that the cassette 3 on the opposite side is fully loaded with the lead frame 2 and the cassette 3 on the near side is shown.
Indicates an empty state. One or a plurality of cassettes 3 are mounted on a cassette magazine 4 via a jig 10. When the uppermost lead frame 2 of the many lead frames 2 loaded in the cassette 3 is supplied, the lifting mechanism 8 sequentially pushes up the lead frames 2 one by one via the jig 10. When the entire lead frame 2 loaded in one cassette 3 is supplied, the cassette magazine 4 moves to the front side, and then the lead frame 2 is supplied from the next cassette 3. The cassette supply unit 5 is configured with the above structure.

[0004] The pickup unit 6 sequentially sucks or holds a large number of lead frames 2 loaded in the cassette 3 one by one from the uppermost lead frame 2 via a jig 10 and supplies the same to the next step.

When the lead frame 2 is completely supplied from one or a plurality of cassettes 3 and becomes empty, the operator stops the operation of the lead frame supply device and fills the empty cassette 3 with a full load. It must be replaced with cassette 3.

When supplying lead frames of other types, not only the lead frame but also the cassette, the cassette magazine and the pickup section must be exchanged, or a supply device dedicated to other types is required.

[0007] Other conventional techniques are described in the following document.

(1) Japanese Patent Laid-Open Publication No. Hei 6-84772 The magazine supplied from the empty magazine supply unit is lifted to a predetermined position by an elevator, where a plurality of lead frames are stored, and the full magazine is discharged to the discharge side. In the unloader to be moved, in order to replace the magazine that is full of the lead frame at the predetermined position with an empty magazine,
There will be two elevators, a frame storage elevator and a magazine supply elevator.

(2) Japanese Patent Laid-Open Publication No. Sho 64-2940 A mechanism provided in an elevator exchanges a lead frame magazine placed on a magazine supply conveyor and cuts out the lead frame magazine sequentially, thereby shortening the lead frame magazine replacement time. .

(3) Japanese Patent Application Laid-Open No. 1-143225 By adjusting the elevator section, the positioning section, the robot section, and changing the chuck attached to the hand in accordance with lead frames of different dimensions, one apparatus can be used. A variety of lead frames can be supplied to the transport frame.

(4) Japanese Patent Application Laid-Open No. 61-46032 By controlling a feeder section and a loader section by a control section which recognizes a type and outputs a predetermined signal, a lead frame of various types can be arbitrarily selected. Supply automatically.

[0012]

In the conventional lead frame supply apparatus, the number of cassettes 3 to be mounted on the cassette magazine 4 is limited. If supplied, the operator has to stop the operation of the supply device of the lead frame and replace the empty cassette 3 with the cassette 3 which is full, and the work efficiency has been reduced.

Further, when the production form of the lead frame shifts to multi-product small-quantity production, frequent replacement work of the cassette magazine 4 and the pickup unit 6 dedicated to each product is required, and the operation of the lead frame supply device is required. Rates have fallen, and productivity has declined.

Further, as the types of lead frames increase, it becomes necessary to store a jig 10 dedicated to each type.
There is a disadvantage that the floor area utilization rate of the factory is reduced.

Therefore, the present invention improves the drawbacks of the above-mentioned conventional lead frame supply device, and the lead frame or semiconductor device and the cassette often differ in size for each type, but it is possible to cope with many types. The replenishment (addition) of the cassette and the collection (discharge) of the empty cassette can be performed easily and without interruption.

[0016]

According to the first aspect of the present invention, there is provided a lead frame supply apparatus for sequentially supplying lead frames from a cassette in which various types of lead frames are loaded and accommodated, wherein the cassette includes A cassette supply unit for mounting the cassette on a transport path and setting the cassette at a predetermined position is included in the cassette supply unit, and the cassette is set at a predetermined position in the width direction and the length direction. Occasionally, a cassette length guide that guides the length direction of the cassette according to the type of the cassette and a cassette width guide that guides the width direction of the cassette are provided, and further, guides in the length direction and the width direction of the cassette. When the lead frame is lifted to a predetermined position when the lead frame loaded on the cassette is lifted, A lead frame length guide that guides the length direction of the lead frame according to the type of lead frame; and a lead frame length guide that guides the width direction of the lead frame. It is possible to obtain a lead frame supply device comprising: a transfer section that takes out one lead frame at a time from the uppermost part and guides the lead frame to the transport mechanism, for which the guide in the width direction is completed.

According to the second aspect of the present invention, it is possible to obtain the lead frame supply device according to the first aspect, wherein the transfer section takes out the lead frame by suction.

According to the third aspect of the present invention, the transfer section includes a mechanism for reversing the sucked lead frame, and transfers the lead frame after reversal to the transport mechanism. 2 can be obtained.

According to a fourth aspect of the present invention, the transfer section is constituted by a plurality of suction ports arranged in the length direction of the lead frame, and is suctioned at the center of the width of the lead frame. The lead frame supply device according to claim 2 or 3 can be obtained.

According to a fifth aspect of the present invention, in the lead frame supply device according to the third or fourth aspect, the reversing mechanism of the transfer portion reverses the lead frame around a longitudinal direction of the lead frame. Can be obtained.

According to the invention described in claim 6, the lead frame supply device discharges the cassette emptied by the removal of the lead frame by the transfer section from the transport path and recovers the cassette on the discharge path. The lead frame supply device according to any one of claims 1 to 5, further comprising a cassette collection unit.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

A cassette length guide 1 for guiding the length direction of a cassette on a table 11 on which a plurality of lead frames 2 are housed in a stacked manner and in which a cassette 3 is stored.
2 are provided so as to face each other. Each guide is arranged on a one-axis stage 13 and has an NC (numerical control) motor 14.
Is transmitted to the moving shaft 15 and the opening and closing mechanism performs a moving operation based on the data value from the control unit 16. The cassette width guide 17 for guiding the width direction of the cassette 3 is
Two cassette width guides 17 are provided on the side plate of the elevating mechanism 18, and each cassette width guide 17 is disposed on a one-axis stage 20, and the power of the NC motor 21 is moved by a moving shaft 23 by a belt 22, for example.
And an opening / closing mechanism for performing a moving operation based on the data value from the control unit 16. A push plate 26, which operates on the lower surface of the table 11 by using the fluid cylinder 25 engaged with the one-axis stage 24 as a driving force, pushes (forwards) until the leading end of the full cassette 7 comes into contact with the cassette width guide 17. Is provided.

After the operation of the cassette length guide 12 and the cassette width guide 17 moved to the set positions by the data from the control unit 16, the cassette supply unit removes the cassette 7 on which the lead frame 2 is fully loaded on the table 11 from the cassette length. Guided by guides 12 and mounted sequentially in parallel, push plate 26 pushes the cassette abdominal surface (M surface in FIG. 3) and pushes out until the leading end of full cassette 7 abuts on cassette width guide 17, and after completion of the pushing operation Is designed so that the thrust of the fluid cylinder 25 is in a no-load state, so that the push plate 26 can be easily pulled out by hand, and a new cassette 7 full of lead frames 2 is mounted in the drawn-out space. However, it is possible to replenish or add additional cassettes 7 which are sequentially loaded.

When the cassette 7 fully loaded in the cassette supply unit is in a full state, no additional insertion is possible. However, the empty cassettes 9 are sequentially collected in a cassette storage unit to be described later, and can be temporarily supplied.

The shape of the cassette 3 is U-shaped when viewed from above. Elevating slider 28 to which a U-shaped arm 27 of a size not interfering with the opening is fixedly connected.
Transmits the power of the NC motor 29 from the lowermost position of the cassette below the table 11 to the moving shaft 31 by, for example, the belt 30 and performs the moving operation based on the data value from the control unit 16. The lead frame 2 on the uppermost surface is configured to be stopped by the level detection sensor 32 by the operation of the elevating slider 28, and ascends to a lead frame transfer position (transfer position: N position in FIG. 1) of a reversal transfer unit described later. The lead frame 2 is also configured to be guided in the width direction and the length direction by the lifting mechanism configured to perform the transfer during the lifting and lowering, similarly to the above-described cassette 7 which is fully loaded.

Two sets of lead frame length guides 33 are provided facing the lead frame guide base 34.
Each guide is disposed on a one-axis stage 35 and has an opening / closing mechanism for transmitting the power of the NC motor 36 to the moving shaft 38 and performing a moving operation based on a data value from the control unit 16.

A lead frame width guide 39 for guiding the width direction of the lead frame 2 is arranged on the lead frame guide base 34 at a position orthogonal to the lead frame length guide 33.

Two sets of the lead frame width guides 39 are opposed to each other.
A separator unit is provided on the single-axis stage 40 and includes an opening / closing mechanism that transmits the power of the NC motor 41 to the moving shaft 43 by, for example, a belt 42 and performs a moving operation based on a data value from the control unit 16. Have been. After the operation of the lead frame length guide 33 and the lead frame width guide 39 moved to the set position by the data from the control unit 16 is completed, the lifting slider 28 is operated, and the lead frame 2 is moved by the guides 33 and 39. Guided and ascended to the topmost lead frame position (N position in FIG. 1)
, And when it is received by a reversing transfer section, which will be described later, the next uppermost lead frame 2 is sequentially raised as described above, and the transfer operation is repeated.

The lead frame 2 cut out to a predetermined height position in the separator section is sucked and pulled up by a suction bar 44 having a plurality of suction ports 37 (for example, suction pads). The suction port 37 used in the control unit 16 is selected as the suction port 37 of the suction bar 44 according to the type data of the mounting pitch (called an island pitch) of the semiconductor device 1 of the lead frame 2. The suction bar 44 is installed in engagement with a Z stage 45 that moves up and down, and is mounted on a moving shaft by, for example, a belt 47 so as to be associated with the type of the semiconductor device 1 of the lead frame 2 and in the thickness direction. 48 to perform a moving operation based on the data value from the control unit 16.

Further, the reversing mechanism constituted by a reversing mechanism using the rotating fluid cylinder 49 as a power for reversing the lead frame 2 (reversing the front and back sides) and transferring the lead frame 2 to the conveying surface (the O position in FIG. 3). A mounting portion is configured. The reverse transfer unit is set by the data of the control unit 16 by lowering the suction bar 44 having the plurality of suction ports 37 at the lead frame position cut out to a predetermined height position (the N position in FIG. 1). The suction port 37 sucks, and the lead frame 2 is turned upside down to a preset height. After the reversal, the sheet further rises to the transport surface (the O position in FIG. 3) and is received by the transport unit described later. At the completion of the reception, the suction is released, the suction bar 44 having the reversing mechanism returns, and the operation of receiving the next lead frame 2 is sequentially performed as described above.

The lead frame 2 transferred by the above-mentioned reversing transfer section is gripped by a pair of roller plates 52 having upper rollers 51 and a pair of swing arms 53 having lower rollers 50. It is held and placed on a predetermined transport surface (O position in FIG. 3). The pair of swing arms 53 are operated by the power of the fluid cylinder 54. The gripping mechanism is disposed on a pair of uniaxial stages 55,
The power of the NC motor 56 for setting the width direction of the lead frame 2 is transmitted to the moving shaft 73 by, for example, the belt 57,
The moving operation is performed based on the data value from the control unit 16 so that the lower roller 50 is pressed against the upper roller 51 at the time of conveyance, and the lead frame 2 is connected to the upper roller 5.
1 and the lower roller 50. The power of the NC motor 58 is transmitted to the upper roller 51 by, for example, a belt 59, and is conveyed (or stopped) to a conveyance speed or an arbitrary conveyance position based on the data value from the control unit 16 in accordance with the device specification of the next process. A transport mechanism is configured. Control unit 16
When the swing arm 53 is opened after the operation of the swing arm 53 and the roller plate 52 that guides the lead frame in the width direction of the lead frame moved to the set position based on the data from the lead frame 2, the lead frame 2 is moved to a predetermined transport surface (FIG. (O position), the above-described reversing transfer section transfers the swing arm 53 to close, that is, a state in which the lead frame 2 is held, and the transfer to the transport surface is completed. After the transfer is completed, the lower roller 50 conveys according to the device specification of the next process based on the data value from the control unit 16.

At the transfer port (exit) of the transfer section for transferring to the next step, there is provided a posture determination section having a camera 60 for recognizing that the lead frame 2 has been supplied in a normal posture. The lead frame 2 is temporarily stopped at a predetermined position of the transport unit for transporting to the next process, the shape of the lead frame 2 of each type is registered in the recognition device 61, and detected by the camera 60 installed above the transport port, and controlled. The recognition device 61 is configured to determine the posture based on the data from the unit 16 and determine the next process.

The cassette 9 which has been completely emptied after the transfer in the separator section is pushed out by an empty cassette push plate 64 fixedly connected to a slider 63 driven by a fluid cylinder 62, and a plurality of cassettes 9 can be stored. And it is stored in the collection rack 65 partitioned at a predetermined interval.

The collection rack 65 is installed on a rack table 66. The rack table 66 is mounted on a one-axis stage 67 and transmits the power of an NC motor 68 to a moving shaft 70 by, for example, a belt 69, and transmits data from the control unit 16. It has a moving mechanism that performs a moving operation based on the value.

A cassette recovery section having a slider mechanism for manually pulling out the recovery rack 65 when the empty cassette 9 is full is constructed. The empty cassette 9 is searched by the sensor 71 for an empty position where the empty cassette 9 is not stored by the empty cassette push plate 64 using the empty cassette push plate 64.
And store it. After storing, the next empty position is searched by the sensor 71 and moved to the storing position. After the completion of the pushing, the push plate 64 returns, and the cassette 7 in which the new lead frame 2 is fully loaded is sequentially supplied by the cassette supply unit.

When the empty cassette 9 is full in the collection rack 65, the rack table 66 moves to the discharge side (P direction in FIG. 2). After the movement is completed, the lock mechanism 72 tightly fastened to the rack table 66 is released from the collection rack 65, and the collection rack 65 is manually pulled out, and the empty cassette 9 is taken out and discharged. After the discharge, when the collection rack 65 is pushed back, the rack table 66 is locked again, and the above-described operation is repeated.

As described above, the width and length of the cassette 3 and the lead frame 2, the data of the semiconductor device 1 in the lead frame, and the like are automatically determined based on the type data registered in advance. By setting, all cassettes 3 and lead frames 2 can be transferred and empty cassettes 9 can be collected, and versatility corresponding to multiple types of single-sheet supply of lead frames 2 without interruption by a carry-in permission signal from the next process. To provide.

[0039]

As is apparent from the above description, the present invention has the following advantages.

(1) The size of the lead frame or the semiconductor device and the cassette often differs depending on the type, but it is convenient because it can handle many types.

(2) Replenishment (addition) of cassettes and collection (discharge) of empty cassettes can be easily performed without interruption, thereby improving work efficiency.

(3) A recognition device for photographing with a camera is installed to determine the supply attitude of the lead frame before transporting to the next process, which is useful for improving the quality.

(4) Since the storage of different types of parts, which has been required conventionally, becomes unnecessary, the floor area utilization efficiency of the factory is improved.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a side view of one embodiment of the present invention.

FIG. 4 is an enlarged side view of a lead frame gripping mechanism of a transport unit in one embodiment of the present invention.

FIG. 5 is a plan view of a lead frame of each type applied to the present invention, which is shown in (a), (b), (c), and (d) in order.

FIG. 6 is a front view of a semiconductor device in a lead frame applied to the present invention.

FIG. 7 is a plan view of a cassette applied to the present invention.

FIG. 8 is a front view of a cassette applied to the present invention.

FIG. 9 is a side view of a cassette applied to the present invention.

FIG. 10 is a perspective view of a cassette applied to the present invention.

FIG. 11 is a perspective view of a conventional lead frame supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semiconductor device 2 Lead frame 3 Cassette 4 Cassette magazine 5 Cassette supply part 6 Pickup part 7 Cassette 8 Elevating mechanism 9 Cassette 10 Jig tool 11 Table 12 Cassette length guide 13 Single axis stage 14 NC motor 15 Moving axis 16 Control part 17 Cassette width Guide 18 Lifting mechanism 19 Side plate 20 1-axis stage 21 NC motor 22 Belt 23 Moving axis 24 1-axis stage 25 Fluid cylinder 26 Push plate 27 Arm 28 Elevating slider 29 NC motor 30 Belt 31 Moving axis 32 Level detection sensor 33 Lead frame length guide 34 Lead frame guide base 35 1 axis stage 36 NC motor 37 Suction port 38 Moving axis 39 Lead frame width guide 40 1 axis stage 41 NC motor 42 Belt 43 Moving axis 44 Suction Bar 45 Z stage 46 NC motor 47 Belt 48 Moving shaft 49 Rotating fluid cylinder 50 Lower roller 51 Upper roller 52 Roller plate 53 Swing arm 54 Fluid cylinder 55 Uniaxial stage 56 NC motor 57 Belt 58 NC motor 59 Belt 60 Camera 61 Recognition device 62 Fluid cylinder 63 Slider 64 Empty cassette push plate 65 Collection rack 66 Rack table 67 Single axis stage 68 NC motor 69 Belt 70 Moving axis 71 Sensor 72 Lock mechanism 73 Moving axis

Continuation of the front page (56) References JP-A-5-291311 (JP, A) JP-A-61-150920 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01L 21 / 50

Claims (6)

(57) [Claims] 1. A variety of lead frames are loaded and accommodated.
To supply lead frames sequentially from the cassette
In the frame supply device, the cassette has a dimension in a width direction and a length direction.
The cassette is mounted on a transport path and set at a predetermined position.
Cassette supply section, and the cassette supply section
When the cassette is set in place, the cassette
Cassette for guiding the length direction of the cassette according to the species
A long guide and a cassette width guide for guiding the cassette in the width direction.
And the guide in the length and width directions of the cassette is completed.
Then, the lead frame loaded on the cassette is
The lifting mechanism that raises the lead frame, and after the lead frame is lifted,
Lead to guide the length direction of the lead frame accordingly
Consider the frame length guide and the width direction of the lead frame.
And a guide in the length direction and width direction of the lead frame.
Take out the completed lead frames one by one from the top
And a transfer unit for transferring the data to a transfer mechanism . 2. The method according to claim 1, wherein the transfer section is configured to hold the lead
The reel according to claim 1, wherein the frame is taken out.
Frame feeding device. 3. The lead frame according to claim 1, wherein
A mechanism for reversing the lead frame after reversal.
3. The reloading device according to claim 2, wherein the transfer is performed on a transport mechanism.
Card frame supply device. 4. The transfer section has a length of the lead frame.
Composed of a plurality of suction ports arranged in
3. The apparatus according to claim 2, wherein the suction is performed at the center of the frame width.
Or the lead frame supply device according to 3. 5. The reversing mechanism of the transfer section, wherein the lead
A contractor characterized by reversing around the length direction of the frame.
The lead frame supply device according to claim 3 or 4. 6. The lead frame supply device according to claim 1 , wherein
Empty due to removal of lead frame by mounting part
Discharge the cassette from the transport path and place it on the discharge path
Claims characterized by comprising a cassette collecting section for collecting
Item 6. The lead frame supply device according to any one of Items 1 to 5.