JP4353342B2 - Device for checking the normal processing position of strip products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold for processing a plurality of semiconductor chips mounted on a strip product, for example, a TAB film, for each product, and in particular, a positioning pin is provided in a positioning hole when processing a strip product. The present invention relates to a mold in which each processing center of a strip product is positioned at a normal position by insertion.
[0002]
[Prior art]
As seen in Japanese Patent Laid-Open No. 5-123790, a band-shaped film is used for manufacturing a semiconductor chip or the like, and the chip is mounted on the band-shaped film and sequentially machined. For example, in the case of a TAB film, the film is fed using sprocket holes provided at a predetermined pitch, that is, the TAB film is moved. For example, in a processing station where a mold is installed, Then, the semiconductor chip is positioned so as to be aligned with the processing center of each semiconductor chip mounted on the film, and after confirming that the positioning is normally performed, for example, the semiconductor chip is punched. The positioning of the product performed at the processing station is generally performed by inserting a pilot pin provided at the processing station into the sprocket hole of the strip-shaped product, and the confirmation is performed using a sensor. ing.
[0003]
However, the conventional processing center positioning is such that the processing center of each product mounted on the strip film is aligned with the nearest sprocket hole (most typically, both are located on the same line). For example, when the pitch of the product to be mounted on the belt-like film is narrowed, this premise is collapsed.
[0004]
The recent cost competition has forced the strip film to have as many products as possible, and to meet this need, even if the relationship with the sprocket holes in the strip film is broken to some extent, It is necessary to narrow the mounting pitch, and in this case, even if there is a gap between the product processing center and the sprocket hole, a device that can accurately process it in an appropriate manner is required. .
In order to meet this demand, it is not practical to provide a means for adjusting the mold processing center for each product because the mechanism becomes complicated. On the other hand, it is practical to move the pilot pin as the positioning pin to ensure the deviation between the product processing center and the sprocket hole.
[0005]
However, making the pilot pin on the mold side displaceable is less reliable than a conventional device in which this is fixed.
That is, in the conventional method, the sprocket hole of the belt-shaped film and the processing center of each product are aligned, and the pilot pin on the mold side is fixed on the assumption that this pilot pin is the belt-shaped film. It can be properly positioned by inserting it into the sprocket hole of this product, but there is a gap between the sprocket hole of the strip film and the processing center of each product, and the pilot pin is movable When this happens, even if the pilot pin enters the sprocket hole without any trouble, it is necessary to trust that the processing center of each strip film product matches the processing center of the mold. Some anxiety remains.
[0006]
In other words, when a pilot pin enters a sprocket hole that should not originally penetrate (for example, a sprocket hole adjacent to a sprocket hole that should originally penetrate), the machining center of the product does not match the machining center of the mold. Despite being there, there is a risk that the processing will be carried out.
[0007]
[Problems to be solved by the invention]
In order to meet the demand for mounting as many products as possible on the belt-shaped film, the present invention provides a belt-shaped product processing center and a mold processing center that are generated when positioning pins, that is, pilot pins, are movable. It is an object of the present invention to provide a method and apparatus for confirming the normal processing position of a strip product to ensure the coincidence.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a check hole provided at a predetermined pitch separately from a positioning hole for a belt-like product in a belt-like product in which a plurality of products to be processed are arranged in a row, and a processing machine. And a check pin for entering the check hole and confirming that the processing center of the strip-shaped product coincides with the processing center of the processing machine, There is a gap between the positioning hole and the processing center of the strip-shaped product, and a plurality of the check pins are arranged apart from each other in the moving direction of the strip-shaped product, and the plurality of check pins are connected to the positioning hole and the strip It is characterized in that it is spaced from each other in relation to the amount of misalignment with the processing center of the strip-shaped product.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail based on preferred examples.
FIG. 1 is a schematic front view of a pilot pin movable mold, and FIG. 2 is a diagram showing an extracted pilot holder and its drive mechanism installed in the mold of FIG. FIG. 3 is a longitudinal sectional view showing a selective check pin device installed in association with the pilot pin movable die of FIG.
[0011]
Referring to FIG. 1, a pilot pin movable mold 100 has a machine frame 2, and a pair of guides, that is, linear guides 6 are installed on the upper horizontal frame 4 of the machine frame 2 at a distance from each other. A pilot holder 8 is attached to the guide 6, and the pilot holder 8 is, for example, a strip product 10 to be processed by the mold 100, which is composed of a TAB on which semiconductor chips are mounted at regular intervals, an epoxy lead frame, and a normal lead frame. In the moving direction A (see FIG. 2). The pilot holder 8 is provided with a pair of product processing position confirmation pins spaced apart in the lateral direction, that is, in the width direction of the belt-like product 10, that is, pilot pins 12 projecting downward.
[0012]
One end of the pilot holder 8 in the width direction protrudes from the machine casing 2 to the outside, and an engagement pin 14 protrudes upward from one end surface of the pilot holder 8. As shown in FIG. 2, a servo motor 16 having an encoder (multi-position numerical control) and a ball screw 18 connected to the servo motor 16 are provided outside the mold 100. Is arranged parallel to the moving direction A of the belt-like product 10, and the engagement pin 14 of the pilot holder 8 described above is accommodated in a notch 20 opened outwardly provided at the tip of the ball screw 18. ing. The combination of the notch 20 and the engagement pin 14 opened to the outside allows the driving element of the pilot pin moving mechanism to be easily provided outside the mold 100 and makes the mold 10 removable. . The driving element of the pilot pin moving mechanism can be provided outside the machine frame 2.
[0013]
The pilot pin moving mechanism based on such multi-position numerical control can move the pilot holder 8, that is, the pilot pin, to an arbitrary position. For example, if it is sufficient to position the pilot holder 8 at two positions, An air cylinder may be substituted.
[0014]
The belt-shaped product 10 moves while being guided in the mold 100 by guide rails 22 that are spaced apart in the width direction. In the pilot pin movable mold 100, a die 24 is fixed on the upper side of the belt-shaped product 10 and a punch 26 is disposed on the lower side. The punch 26 is movable in the arrow direction B in FIG. It is. In the mold 100, the punch 26 moves upward toward the die 24 to punch out the belt-like product 10, and is received by a vacuum chuck (not shown) and conveyed to the outside.
[0015]
Referring to FIG. 3, the selective check pin device 200 is installed on the pilot pin movable die 100 described above. The selective check pin device 200 is provided with first to third three check pins 30, 32, and 34 that are separated along the moving direction A of the belt-like product 10. The distance between the first check pin 30 and the second check pin 32 takes into account the distance between C2 and C3, and between the second check pin 32 and the third check pin 34. The separation distance is determined in consideration of the distance between C1 and C2.
[0016]
The first to third check pins 30, 32, and 34 are urged upward by return springs 36, 38, and 40, respectively. In relation to the first to third check pins 30, 32, 34, first to third air cylinders 42, 44, 46 are arranged, respectively, and these first to third air cylinders 42 are arranged. 44, 46, the first to third check pins 30, 32, 34 are independently driven downward.
[0017]
The selective check pin device 200 is also related to the first to third check pins 30, 32, and 34 in order to confirm the operation of each check pin, that is, whether or not each check pin has been operated normally. The three sensor pairs (transparent photoelectric switch pairs) 48 are arranged, and these sensor pairs 48 are arranged apart from each other along the moving direction A of the belt-like product 10. The distance between adjacent pairs of sensors 48, that is, the pitch, is set in consideration of the fact that the operation confirmation of each check pin can be reliably detected. In the above description, a pair of transmissive photoelectric switches are used as sensors, but various other known photosensors such as fiber sensors may be used.
[0018]
Next, operations of the pilot pin movable die 100 and the selective check pin device 200 described above will be described with reference to FIG.
The strip-shaped product 10 has three identical products P1 to P3 arranged in order in the longitudinal direction, and the processing centers C1, C2, and C3 of the products P1, P2, and P3 are along the side edges of the strip-shaped product 10 and the like. The relative positions of the sprocket holes 54 (sprocket holes closest to each processing center) provided at intervals are different from each other. Such a strip product 10 is fed into the mold 100 in a state of being housed in the frame frame F of FIG. In the frame F, for example, check pin holes 52 are provided at equal intervals at a position aligned with the processing center C2 of the middle product P2.
[0019]
The position of the pilot pin 12 is previously adjusted by the servo motor 16 so that the pilot pin 12 can enter the sprocket hole 54 adjacent to the products P1 to P3 to be carried. The belt-shaped product 10 is positioned by the pilot pin 12, and then the punch 26 moves upward toward the die 24 to punch each product P <b> 1 to P <b> 3.
[0020]
When the first product P1 is punched, a third check pin 34 is provided to ensure that the processing center C1 of the first product P1 is definitely coincident with the processing center of the mold 100. Move down. When the third check pin 34 enters the check pin hole 52 correctly, it is confirmed that the processing center C1 of the first product P1 exists in the processing center of the mold 100. Whether or not the third check pin 34 has normally entered the check pin hole 52, in other words, the final confirmation that the processing center C1 of the product P1 is correctly present at the processing center of the punch 26 is as follows. , By sensor 48.
[0021]
Similarly, when the second product P2 is punched, the second check pin 32 enters the check pin hole 52, whereby the second product P2 processing center C2 is moved to the processing center of the mold 100. The final confirmation is performed by the sensor 48. Similarly, when the third product P3 is punched, the processing center C3 of the third product P3 becomes the processing center of the mold 100 by the operation in which the first check pin 30 enters the check pin hole 52. The presence is confirmed and the final confirmation is performed by the sensor 48.
[0022]
The relative difference between the machining centers C1 to C3 of the first to third products P1 to P3 and the sprocket holes 54 is compensated by appropriately moving the pilot pin 12, and thereby each product P1 to P3. Is punched by the punch 26, the position of the pilot pin 12 is adjusted so that the pilot pin 12 properly enters the sprocket hole 54 at a position where the machining centers C1 to C3 are aligned with the machining center of the punch 26. The
[0023]
That is, the servo motor 16 having an encoder and the ball screw 18 connected to the servo motor 16 move the pilot pin 12 in the direction opposite to the moving direction A of the belt-like product 10 to adjust the arrangement position of the pilot pin 12. Therefore, when the products P1 to P3 are punched out by the punch 26, the pilot pins 12 normally enter the sprocket holes 54, whereby the processing centers C1 to C3 of the respective products are formed. It can be confirmed that the machining center of the punch 26 and the punch 26 are coincident.
[0024]
The operation of the servo motor 16 is automatically performed by a controller (not shown). For example, when the servo motor 16 is driven at 8192 pulses / r and the lead of the ball screw 18 is 1.5 mm, the resolution is 0.2 microns (1.5 / 8192 = 0.0002 ), and the pilot The pin 12 can be finely adjusted.
[0025]
【The invention's effect】
According to the present invention, the belt-shaped product processing center and the mold processing center, which are generated when the positioning pins, i.e., the pilot pins, are moved, are met while meeting the need to mount as many products as possible on the belt-shaped film. Makes it possible to ensure a good match.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a pilot pin movable die.
FIG. 2 is a diagram showing an extracted pilot holder and its driving mechanism installed in the mold shown in FIG. 1;
3 is a longitudinal sectional view showing a selective check pin device installed in association with the pilot pin movable die of FIG. 1; FIG.
FIG. 4 is a plan view showing an example in which one regular check pin hole is provided in units of three processing centers.
[Explanation of symbols]
100 Pilot Pin Movable Mold 200 Selective Check Pin Device 8 Pilot Holder 10 Strip Product 12 Pilot Pin 30 First Check Pin 32 Second Check Pin 34 Third Check Pin 42 First Air Cylinder 44 Second Air Air cylinder 46 Third air cylinder A Direction of movement of the belt-shaped product

Claims (1)

Check holes provided at a predetermined pitch separately from the positioning holes of the strip- shaped product in the strip-shaped product in which a plurality of products to be processed are arranged in a row,
Provided in the processing station processing machine is installed, it has a check pin to ensure that processing center of the material web from entering matches the processing center of the machine in the checking hole ,
There is a gap between the positioning hole and the processing center of the strip product,
A plurality of the check pins are spaced apart from each other in the moving direction of the strip product, and the plurality of check pins are spaced from each other in relation to the amount of misalignment between the positioning hole and the processing center of the strip product. A device for confirming a normal processing position of a strip-shaped product, characterized by being provided with a gap therebetween .

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