JP2667707B2 - Lead frame separation device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame separating device, and more specifically, a device for separating lead frames used for manufacturing a resin-sealed semiconductor device or the like from a vertically stacked state one by one. It is about.

2. Description of the Related Art For example, in the manufacture of a resin-sealed semiconductor device such as a transistor or an IC, a metal lead frame is generally used. In the semiconductor device manufacturing process, a large number of vertically stacked lead frames are separated one by one, and then the lead frames are transported to a subsequent process such as a pellet mounting process. As means for separating the lead frames one by one from the vertically stacked state, conventionally, there has been a means using a vacuum suction means or a magnetic suction means.
In this lead frame separating means, the uppermost lead frame is adsorbed and separated from above a large number of vertically stacked lead frames by a vacuum adsorption pad or a magnet, and this is conveyed to a pellet mounting process or the like. The vertically stacked lead frames are placed on an elevator mechanism, and the elevator mechanism moves the lead frame upward for each separating operation as described above, thereby separating the uppermost lead frame from a predetermined position. When all the lead frames have been separated, the elevator mechanism is moved down to the initial position, the next vertically stacked lead frames are supplied, and the above-described separating operation is repeated.

Incidentally, the lead frame is generally formed by etching or pressing a plate material. Therefore, when lead frames created by etching are vertically stacked in multiple stages, the loading weight increases,
The lead frames may adhere to each other so that it becomes difficult to separate them. Further, when lead frames formed by press working are vertically stacked, burrs generated during working may be caught on other lead frames. Therefore, when the vacuum suction pad separates the vertically stacked lead frames by the magnet, it is difficult to separate only one lead frame, and often two or three lead frames are separated at the same time. I was In this case, there is a problem that an extra lead frame drops during the transportation to a subsequent process.

An apparatus that solves such a problem is introduced in Japanese Patent Application Laid-Open No. 63-97540. In this publication, in the automatic forced separation of the lead frame, only the leading lead frame 5'of the stocked lead frame 5 rotates at the rotation center 64 as shown in FIGS. 12 to 15 showing the lead frame separating operation. This is a lead frame separation device that separates the lead frame 52 by the separation groove 66 of the separator 65, chucks the separated lead frame 52 by the chuck pawl 17, and supplies the chucked lead frame 52 to the transport rail.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In a conventional lead frame separating device, as shown in FIG. 12, the lead frames 5 are vertically stacked in a tilted manner and are separated one by one by a rotating separator. Therefore, the conventional apparatus can surely separate the lead frames one by one, but the amount of the lead frame increases, and the lead frame automatically bends, or if the engagement between the separator and the lead frame is changed by the stock amount of the lead frame. , The position of the lead frame 5'with respect to the separator 65 is changed,
It is always difficult to stably separate only one sheet, and furthermore, fine adjustment of the height of the separator 65 with respect to the lead frame 5 'is required. Therefore, the present invention proposes to solve the above-mentioned drawbacks.

Means for Solving the Problems The present invention is directed to a flat plate-shaped stocker in which a plurality of lead frames are vertically arranged along a tilt direction, and a plurality of lead frames projecting from a lower edge of the stocker. The lower frame stopper that regulates the position of the lower edge of the lead frame and the upper edge of the lead frame stocked on the stocker are slid linearly and only the foremost lead frame is hooked. A separator that is peeled off, and is movably disposed between the standby position and the chuck position, and is movable back and forth at the chuck position, and holds the upper edge portion of the leading lead frame partially peeled by the separator. An openable / closable chuck claw and a mechanism for supporting the leading lead frame are disposed so as to be movable back and forth outside the upper edge of the leading lead frame. An in-holder and a sub-holder that is disposed so as to be able to move back and forth between the leading lead frame and the succeeding lead frame and that is inserted between the leading lead frame and the trailing lead frame partially separated by the separator to temporarily support the leading lead frame. And a lead frame separating device.

Embodiment An embodiment of a lead frame separating apparatus according to the present invention will be described with reference to FIGS. FIG. 1 is a front view of a lead frame separating apparatus, and FIGS.
FIG. 5 is a view taken along arrows A, B, and C in the figure, and FIGS. 5 to 7 show a separator unit. In the lead frame separating device 1 shown in FIGS. 1 to 7, reference numeral 2 denotes a flat plate-like member which is disposed at a predetermined angle via a support frame 4 erected at one end of a base 3. In the stocker, this stocker 2
A plurality of lead frames 5,5 ...
(Shown by chain lines) are stacked vertically. This stocker 2
The inclination angle of is set so that the succeeding lead frame quickly descends on the stocker 2 by its own weight when the leading lead frame described later is separated. Numeral 6 restricts the position of a lower frame stopper 5 'projecting from the lower edge 2a of the stocker 2 in the longitudinal direction of the lead frames 5, 5,. Reference numeral 7 denotes a reflection type optical sensor embedded near the lower edge of the stocker 2, and detects the lead frame remaining amount by detecting the presence or absence of the lead frames 5, 5, ... On the stocker 2. Reference numeral 8 denotes a transport rail provided at a substantially central portion of the base 3, which includes a fixed guide rail 9 and a movable guide which are spaced apart by the lead frame width in the longitudinal direction of the lead frames 5, 5,. One lead frame 5 composed of rails 10 and separated from the stocker 2 is moved. The movable guide rail 10 is slidably mounted in the lead frame width direction on the base 3 via a cross roller 11, and the movable guide rail 10 is moved back and forth by operating the clamp lever 12 using the elongated hole 13. And the distance from the fixed guide rail 9 is set to the width of the lead frame 5 to make it possible to deal with the type. Reference numeral 14 denotes a pusher disposed near the inner end of the fixed guide rail 9, and a rod of a cylinder 15 which can be extended and retracted in the longitudinal direction of the lead frame below the base 3.
Connected to 15a tip. The lead frame 5 transferred onto the transport rail 8 by the pusher 14 is supplied to the next step. 16 is a check unit, and this check unit 16
Reference numeral 17 denotes chuck claws arranged at a plurality of positions (two positions in the figure) along the movable guide rail 10 of the transfer rail 8 and is based on a shaft 19 provided on a chuck base 18 arranged in parallel with the movable guide rail 10. The upper chucks 20, 20 having the ends mounted thereon, and the upper chucks 20, 20,
Lower chuck whose base end is screwed at the position corresponding to 20
21,21. The upper edge of the lead frame 5 is held between the tips of the upper chucks 20, 20 and the lower chucks 21, 21. The upper chucks 20 and 20 and the lower chucks 21 and 21 are slidably mounted on the shaft 19 and the chuck base 18 so that the type of the lead frame 5 can be adapted. 22 is a mounting portion projecting from the chuck base 18.
23, a tip of a cylinder rod 22a of the cylinder 22 and a free end 24a of an opening / closing lever 24 fixed to a part of a shaft 19,
It is always in contact with the elastic force of a spring 25 stretched between 3 and the lever 24. Reference numeral 26 denotes a swing lever which extends transversely to the transport lever 8, and its tip 26 a is screwed to the chuck base 18 by a long hole 27 so as to be adjustable. Reference numeral 28 denotes a rotating block fixed to a shaft 29 erected in parallel with the fixed guide rail 9 at a side end of the base 3 below the stocker 2.
The base end 26b is mounted via a cross roller 30 so as to protrude and retreat in the width direction of the lead frame. The rotary block 28 is provided with a chuck jaw in / out cylinder 31. The cylinder rod 31a of the cylinder 31 is attached to a part of the base end 26b of the swing lever 26 by the swing lever 2
6 is always brought into contact by the elastic force of the spring 32 stretched between the base end 26b and the rotary block 28. One end of a shaft 29 supporting the rotary block 28 is supported by a bearing member 33, and the other end is connected to an output shaft 35a of a rotary actuator 35 fixed to the base 3 via a lever 34. . Numeral 36 denotes a stopper provided on the base 3 below the tip of a lever 34 supported by the shaft 29 and the output shaft 35a. The rotary lever 35 is actuated to swing the swing lever 26, and the standby position is set. when placing the chuck position P ₂ by moving the chuck claws 17 and 17 of the chuck unit 16 in the P _1, to regulate the rising edge position of the swing lever 26 by abutting the front end of the lever 34 on the stopper 36 .

Reference numeral 37 denotes a first support frame provided upright on a side end portion of the base 3 facing the stocker 2, and 38 denotes lead frames 5, 5 on the stocker 2 via a cross roller 39 on the first support frame 37.
The second support frame 38 is slidably mounted in a direction orthogonal to the inclination direction of... The position of the second support frame 38 is adjusted by using an elongated hole 40 formed in the second support frame 38. Then, the operation is performed by operating the clamp lever 41. Reference numeral 42 denotes a holder base on a flat plate fixed to the tip of the second support frame 38. Reference numeral 43 denotes a lead frame 5 slidably mounted on the lower surface of the tip of the holder base 42 via cross rollers 44, 44. The main holder base is a long plate-like main holder base along the longitudinal direction, and is moved back and forth by a main holder cylinder 45 fixed to the holder base 42. Reference numeral 46 denotes a main holder which is screwed to a plurality of positions (two positions in the figure) of the main holder base 43 so as to be position-adjustable in accordance with the type of the lead frame 5 by a long hole 47. The top lead frame 5 'is arranged outside the upper edge portion to support the top lead frame 5'. Reference numeral 49 denotes a separator unit disposed outside the main holder 46 of the main holder base 43. Like the main holder 46, the separator unit 49 is screwed by a long hole 49 so that the position can be adjusted according to the type of the lead frame 5. This separator unit 48 makes a motion very similar to a linear motion by slightly rotating a separator 51 having a large number of fine separation grooves 50 formed on the ground surface of the lead frame as shown in FIGS. A screw is fixed to the arm 58. The arm 58 is fixed by a fulcrum 57 so as to be capable of minute rotation. By this rotation, the bending caused by the separation of the separated lead frame 5 'is absorbed. Swing arm 58
Converts the vertical movement of the separator driving cylinder 53 into the moving direction of the slide pack 55b via the slide pack 55a and the plate cam 52 to drive the separator 51. Even if the separation groove 50 contacts only the leading lead frame and the deflection of the leading lead frame 5 ′ due to the change in the stock amount of the lead frame 5 occurs, the separator 51 has a contact angle of the separator 51 with the leading lead frame. Since there is no influence, only the leading lead frame 5 'can always be stably separated. The separated lead frame 5 'is separated while being pressed against the separator 51 by the separator load spring 54.

Reference numeral 60 denotes a plate-shaped sub-holder base that is slidably mounted on the top surface of the tip end of the holder base 42 via cross rollers 61 and 61 and that is elongated along the longitudinal direction of the lead frame 5. It moves back and forth by a sub-holder cylinder 62 fixed to 42. 63, 63 are sub-holders mounted on both ends of the sub-holder base 60, the leading ends of which are inserted between the leading lead frame 5 'and the succeeding lead frame 5 on the stocker 2 to separate the leading lead frame 5'. At the same time, the subsequent lead frames 5, 5 ... Are temporarily supported.

The operation of the lead frame separating apparatus 1 having the above-described configuration will be described with reference to FIGS. 1 to 7 and FIGS. 8 to 11.

First, a plurality of lead frames 5, 5,... Are vertically stacked on the stocker 2 in the initial state shown in FIG. At this time, the leading lead frame 5 'of the lead frames 5, 5,... Is supported by the main holder 46, and the lower edge portion is regulated by the lower frame stopper 6 of the stocker 2. From this state, the separator 51, which is in contact with the upper edge of the leading lead frame 5 'on the stocker 2, is moved into the separating groove 50 of the separator 51 by the operation of the separator driving cylinder 53 as shown in FIG. Frame 5 '
Lead frame 5'from the state where the upper edge of
The upper edge of the top lead frame 5 'is slightly peeled off from the subsequent lead frames 5, 5,...

The chuck unit 16 in the standby position P ₁ as shown from the state in FIG. 9, the rotary actuator
The swing lever 26 is swung by the action of 35 to raise it. When this chuck unit 16 reaches the upper end position to stop the rotary actuator 35 to place the chuck jaws 17, 17 in the closed state to the chuck position P _2.

The chuck pawls 17, 17 are moved forward through the swing lever 26 by the operation of the chuck pawl in / out cylinder 31, and the separator 51 is placed between the upper chucks 20, 20 and the lower chucks 21, 21 of the chuck pawls 17, 17. First, the upper edge of the leading lead frame 5 'on the stocker 2 which has been partially peeled off is placed. At the same time as the inward movement of the chuck claws 17, 17, the sub holders 63, 63 are advanced by operating the sub holder cylinder 62 of the holder base 42, and the leading lead frame 5 'partially separated by the separator 51 and the Insert between lead frames 5,5,5 ...

From this state, as shown in FIG. 10, by operating the chuck claw opening / closing cylinder 22, the shaft 19 is rotated via the opening / closing lever 24, and the upper chuck 2 of the chuck claws 17, 17 is moved.
0,20 is closed, and the upper edges of the lead frame 5 'are clamped by the chuck claws 17,17. Then, by operating the main holder cylinder 45 of the holder base 42, the main holders 46 and 46 of the main holder base 43 and the separators 51 and 51 of the separator units 48 and 48 are moved backward. At this time,
The lead frame 5'of the stocker 2 has chuck jaws 17,1
It is sandwiched by 7 and the following lead frames 5, 5 ... are sub holders 6.
Supported by 3,63.

From this state, by operating the chuck pawl in / out cylinder 31 as shown in FIG. 11, the chuck pawls 17, 17 are moved backward through the swing lever 26, and are held by the chuck pawls 17, 17. The leading lead frame 5 'is pulled out from the lower frame stopper 6 of the stocker 2 and separated. After-out operation of the chuck claws 17, 17, lowers the chuck unit 16 by swinging the swing lever 26 by the operation of the rotary actuator 35, and transferred to the standby position P ₁ of the chuck claws 17 and 17 from the chuck position P ₂ The leading lead frame 5 'to the transport rail 8
Place on top. When the chuck pawls 17, 17 are opened by the operation of the chuck pawl opening / closing cylinder 22, the leading lead frame 5 'is fixed on the transfer rail 8 and placed on the movable guide rails 9, 10, and the next lead frame 5' is pushed by the pusher 14. It is transported to the process.

During the lowering of the chuck unit 16 described above, the main holder cylinders 45 of the holder base 42 are operated separately from the operation of the chuck unit 16 so that the main holders 46, 4
6 and the separators 51, 51 of the separator units 48, 48 are moved forward, and then the sub-holder cylinder 62 of the holder base 42 is operated to move the sub-holders 63, 63 backward. As a result, the subsequent lead frames 5, 5... On the stocker 2 supported by the sub-holders 63, 63 slide on the inclined stocker 2 by their own weight, and move to the main holders 46, 4.
Supported by 6, set to the initial state.

By repeating the above-described operations, the lead frames 5, 5 on the stocker 2 are sequentially separated one by one from the lead frame 5 ', transferred to the transport rail 8 and supplied to the next process.

EFFECTS OF THE INVENTION Published Patent Application JP-A-63-9754, which is a prerequisite technology of the present invention
In the lead frame automatic forced separation device shown in No. 0,
When separating 0.15mm lead frames, there were many mistakes in taking two or separating, but this equipment always displaces the lead frame due to its own weight and the thickness of the lead frame is 0.1 to 0.15mm even when the lead frame is thin. Since only the lead frame to be separated comes into contact with the lead frame, it is stable without taking two sheets or separating errors. For example, in the case of an automatic forced separation device, which is a prerequisite technology of the present invention, a t0.15 mm thick lead frame having a very low rigidity, when 20 sheets are separated, two sheets are taken out once or a separation error occurs. With the forced separation device, no two sheets were taken or there was no separation error.

Also, the type change time when the type of the lead frame is changed can be roughly adjusted by adjusting the height of the separator, so that the type can be easily handled in a short time.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the lead frame separating apparatus according to the present invention, FIG. 2 is a view as seen from an arrow A in FIG. 1, FIG. 3 is a view as seen from an arrow B in FIG. FIG. 5 is a front view showing the separator unit of the apparatus shown in FIG. 1, and FIG.
5 is a side view of the mechanism shown in FIG. 5, FIG. 7 is a front view showing a drive mechanism of the separator unit of the mechanism shown in FIG. 5, and FIGS.
The figure is a schematic structural perspective view for explaining each operation state of the FIG. 1 apparatus. 12 to 15 are schematic structural perspective views for explaining each operation state of the conventional apparatus. 1 ... Lead frame separating device, 2 ... Stocker, 5,5 '... Lead frame, 6 ... Lower frame stopper, 17 ... Chuck pawl, 46 ... Main holder, 50 ... Separation groove.

Claims (1)

(57) [Claims] 1. A flat stocker in which a plurality of lead frames are vertically stacked along a tilt direction, and a leading lead protruding from a lower edge portion of the stocker is provided. A lower frame stopper that regulates the position of the lower edge of the frame; and a lower frame stopper that is linearly movable at a position opposed to the lower frame stopper and the lead frame. A separator that hooks only the upper edge of the lead frame and partially separates it, and is movable between the standby position and the chuck position.
And an openable and closable chuck claw that is disposed to be able to move back and forth at the chuck position and that holds the upper edge of the lead frame partially separated by the separator. A main holder that is arranged to be movable back and forth and supports the leading lead frame; a leading lead frame and a trailing lead frame that are arranged to be movable back and forth between the leading lead frame and the trailing lead frame and are partially separated by the separator; A lead frame separating device, comprising: a sub-holder for temporarily separating a leading lead frame by being inserted therebetween and temporarily supporting a subsequent lead frame.