JPS5910578B2 - Lead frame finishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lead frame finishing apparatus.

To make the IC (integrated circuit) shown in FIG. 1, both legs of the IC (B. , a lead frame with a slit c punched out leaving the part that should become b. ]Mold a synthetic resin B with an electronic element built in between the legs A and b of the mule A, cut it into pieces one by one, and bend the legs A and b to make a product as shown in Figure 1. When synthetic resin B is molded as shown in Fig. 2, burrs or flashes 1d of the synthetic resin inevitably occur at the contact portions of synthetic resin B and lead frame A, so these must be removed. It won't happen.

Although it has been experimentally confirmed that these can be effectively removed by wet or dry spraying, there has not been a device that can remove them efficiently with a simple structure. It is an object of the present invention to provide such a device. The configurations of the first and second inventions will be explained based on FIG.
A pair of endless chains 3, 3 having linear running portions 2, 2', respectively, are arranged on both sides of a linear transfer path 1 of a lead frame A molded with synthetic resin B containing electronic elements.
' is rotated continuously or intermittently in opposite directions at the same speed and symmetrically about the center line 01-01 of the transfer path 1, and is placed on the pair of frame frames 4, 4. When the chain wheels 5, 6, 7, 55, 6', and 7' are installed so as to be freely rotatable, and one of the endless chains 3 is to be rotated intermittently, the chain wheel 5 is connected to the intermittent rotation device 8. A swinging arm 9 is pivotally supported on the axis of the chain wheel 7, and the swinging end of the swinging arm 9 is a swinging arm pivoted on the axis of another chain wheel T. The swinging end of the chain wheel 7 is supported by a pivot shaft 11, and two chain wheels 12 and 13 are fixed to the pivot shaft 11.
The chain wheel 12 is connected to the cross chain 1 from the axis of
4, the shafts of the chain wheel 75 are driven by the open chain 15 from the chain wheel 13, and the chains 2 and 2' are provided with the following elements, as shown in FIG.
Brackets 17 are protruded from the lower side of the links 16 of the chain at regular intervals m, and pieces 18 having a U-shaped cross section are riveted to the brackets 17, and are separately made of an elastic material such as rubber,
A clamping piece 19 having a clamping groove 19f into which one side of the lead frame A can be inserted and clamped is riveted to the U-shaped piece 18. Guide rails 20, 20' of the U-shaped piece 18 are provided, and furthermore, the two frame frames 4, 4' are configured so that the interval n between the guide rails 19, 20 can be made wide or narrow, for example, by means of turban buckles 21, 22. It is.

In this embodiment, the lead frame receiving side is opened in an eight-shape shape so that the lead frame A can be easily held in the first transfer path 1. Furthermore, the clamping pieces 19, 19' of the pair of endless chains 3, 3' are provided so as to face each other in the straight running portions 2, 2'. Although not shown, processing heads for blasting, washing, etc. are provided above the transfer path 1 at intermittent stopping positions of the lead frame. In FIG. 3, numerals 33 and 34 indicate the underframe. Furthermore, in this example, l
The pair of endless chains 3, 3' are connected to the center line 0, -0 of the transfer path 1.
Although the distance n can be adjusted in both directions with respect to 1 as the center, the position of one endless chain may be fixed, and the distance n may be adjusted by moving the other endless chain.

Further, in this embodiment, the pair of endless chains on the lead frame receiving side are opened in a figure-eight shape, but if a chain wheel with a large diameter is used, the same effect can be obtained even if they are not opened in a figure-eight shape. Since this embodiment has the above-mentioned configuration, the interval between the straight running portions 2, 2' of the pair of endless chains 3, 3' is set so that the lead frame A can be held between the holding pieces 19, 19'. n by operating the turnbuckles 21 and 22, and feed the lead frame A into the lead frame receiving side.

This feeding method may be carried out by a chute, and the third
As shown in FIG.
, 3' may approach and feed the lead frame A into a position where the sides of the lead frame A are fitted into the clamping grooves 192. The endless chain 3 that is intermittently rotated by the intermittent rotation device 8 is connected to the axis of the chain wheel 7,
Since the chain wheel 7' is rotated in opposite directions via the cross chain 14, chain wheels 12, 13, and open chain 15, the linear running portions 2, 2' of the pair of endless chains 3, 3' are in the same direction (the It moves intermittently at the same speed in the direction of the arrow in Figure 3).

Therefore, the opposing clamping pieces 1 of the pair of endless chains 3, 3'
9 and 19' elastically clamp the sides of the lead frame A in the clamping grooves 19, and move intermittently along the linear transfer path 1. For this purpose, wet or dry blasting is performed from a processing head installed above the transfer path 1, and the burrs or flashes d of the synthetic resin B of the lead frame A are removed, and the lead frame A is further washed with water while moving intermittently. After undergoing a series of predetermined processing steps, the gripping pieces 19 and 19' move toward the delivery side B, and as the gap between them increases, they separate from the pair of endless chains 3 and 3', and overlap in a predetermined position. It will be done.

In addition, it is preferable that the clamping pieces 19, 195 move the bracket 17 (see FIG. 4) of the endless chain 3 horizontally by guiding it with the guide rails 20, 20'. is the guide rail 20, 20'
It is necessary to position it at a position higher than the surface by the sum of the thickness 191 of the lower side of the bracket 17, the U-shaped piece 18 (see Figure 4), and the thickness 191 of the lower side of the clamping piece 19. It is. If the width of the lead frame A is different, operate the turnbuckles 21 and 22 to connect the pair of endless chains 3 and 3.
It is only necessary to adjust the interval n between '.

Since the first and second inventions have the above-mentioned structural action, the lead frame is continuously and intermittently transferred by a simple clamping and transferring device using elastic clamping pieces having clamping grooves, and the lead frame is not processed during the process. Since a series of processing steps are performed by the head, burrs or flashes on the synthetic resin B of the lead frame A can be removed with high efficiency using a simple device.

In addition, in FIG. 6, a pair of endless chains 3, 3' are connected to the transfer path 1.
A chain wheel 7 is provided so as to be able to continuously rotate in opposite directions at the same speed in a line-symmetrical manner about the center line 01-01 of , γ can be freely widened or narrowed around the center line 01-0.
The worms 39, 39' rotate a worm shaft 38 which is journalled in
The shafts 41, 41' of the worm wheels 40, 405, which are similarly supported on the underframe 44, are connected to the chain wheels 7, 405 via universal joint shafts 42, 42', respectively.
The shafts 43, 43' are supported by groove frames 4, 4', and the frame frames 4, 1 are connected to the dovetail 45 of the underframe 44.
The frame frames 4, 4' are provided with female screw parts 46, 465 having opposite spiral directions, and are screwed into left and right helical rods 47 mounted on the underframe. The spacing n between the chain wheels can be adjusted by operating the left and right spiral rods 47 using a handle 48 provided on the chain wheel 47.

In this embodiment, the spacing between the chain wheels 7 and 7' can be adjusted around the center lines 0 and -01 of the transfer path 1, but one chain wheel is connected to the other chain wheel so that the distance between the chain wheels 7 and 7' can be adjusted. If the distance n is to be adjusted by moving, the left and right spiral rods 47 may be unidirectional spiral rods, and only the axis of the moving chain wheel may be used as the universal joint axis. Next, the configuration of an embodiment of the third invention will be explained with reference to FIGS. 7 and 8. The lead frame A is molded with synthetic resin and has an electronic element built therein. Then, a pair of endless chains 3, 3' having straight running portions 2, 25, respectively, are moved intermittently in opposite directions at the same speed and symmetrically about the center line 01-01 of the transfer path 1. (details of the intermittent rotation drive mechanism of the endless chains 3, 3' are omitted), and the sides of the lead frame A can be elastically held on the outer periphery of the endless chains 3, 3'. Holding groove 192
holding pieces 19, 19' (shown by short lines in FIG. 7) having a fixed interval m, and a pair of endless chains 3,
3', and on the lead frame receiving side of the pair of endless chains, the clamping pieces 19, 19' approach the sides of the lead frame, and the clamping grooves 19 of the clamping pieces 19, 19' At the lead frame delivery side B of the pair of endless chains, the clamping pieces 19 and 1q are made to gradually move away from the side sides of the lead frame, and are placed above the transfer path 1. The processing head for blasting, washing, etc. is installed in the order of processes above the stop position of the intermittent movement of the endless chain, and the pair of endless chains 3,
One of the endless chains 3' is connected to the linear running part 2 so that the return side 31 is also parallel to the linear running parts 2, 2'.
〃 Two endless chains 3 are formed, and another endless chain 3 is provided symmetrically about the center point M of the central axis 0-0 of the chain wheels 5 and 7 of the one endless chain 3, The running direction and speed of the return side 31 of the other endless chain 35 are made to be the same as the running direction and speed of the linear bi-shaped running portion t of the lead frame A, thereby forming a linear transfer path for the lead frame A. The path is the first (1) and the second ().
A lead frame reversing device 23 is installed between the lead frame sending side B of the first transfer path 1 and the lead frame receiving side A 5 of the second transfer path. is parallel to the first and second transfer paths 1, and both transfer paths 1
, a rotating body 2 that rotates around a shaft 24 provided in the middle of the
5, and the rotating body 25 has a center axis 0 of the first transfer path 1.
1-01, and through-holes 26, 26 (Fig.
Grooves 27 and 28 for receiving lead frames are provided on the inner wall of the second transfer path 6, and on the central axis 02-02 of the second transfer path, the lead frame received in the through hole 26 is inserted into the second transfer path 4. An extrusion device 29 is provided on the lead frame receiving side upper 7, and the extrusion device 29 connects the extrusion rod 30 passing through the through hole 26 into the elongated hole 32 at the tip of the swinging rod 31. is driven by a fluid-driven cylinder 32, and processing heads for blasting, water washing, etc. are installed above the second transfer path in the reverse order of the first transfer path 1 in the order of processes.

Note that the processing head is omitted from illustration. Since this embodiment has the above-mentioned configuration, when the lead frame A is supplied to the lead frame receiving shell of the first transfer path, the pair of endless chains 3 and 3', which rotate intermittently in opposite directions, transfer the lead frame is intermittently transferred toward the lead frame delivery side B, during which wet or dry blasting is performed from a processing head installed above the transfer path 1 to remove burrs from the synthetic resin B on the surface of the lead frame. Or flash d is removed.

Lead frame N transferred to the delivery side B of the first transfer path 1
Then, its both sides are pushed into the grooves 27 and 28 in the inner wall of one of the through holes 26 of the rotating body 25 of the reversing device 23, so that when the rotating body 25 is rotated by 18 degrees while the intermittent motion of the endless chain is stopped, the Lead frame ~ is the receiving side A5 of the second transfer path
It is located inside out.

Next, the fluid drive cylinder 32 is actuated, and the swinging rod 31
When the extrusion rod 30 is inserted into the through hole 26 of the rotating body 25, the lead frame N is positioned at the receiving side 5 of the second transfer path, and then a pair of endless chains rotate in an intermittent motion. It is held between the holding pieces 19, 19〃 of 3, 3y, and is intermittently transferred through the second transfer path toward the delivery side Otsu 5. During that time, wet or dry processing is carried out from the processing head installed above the transfer path. Blasting is also performed to remove any burrs or flashes on the back side of the lead frame. Since the third invention has the above-mentioned structural action, while the lead frame is being intermittently transferred through the first transfer path 1, the burrs or flashes of the synthetic resin of the lead frame are removed and the lead frame is turned over. The burrs or flashes on the back surface of the lead frame are removed while the lead frame is being transferred intermittently through the second transfer path, and there is a remarkable effect that a lead frame with no burrs or flashes completely removed can be efficiently obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an example of [C], Fig. 2 is a perspective view of a part of the lead frame in which synthetic resin containing electronic elements is molded, and Fig. 3 is a perspective view of the first and second read frames. A plan view of one embodiment of the lead frame finishing device according to the invention, FIG. 4 is an exploded perspective view of a clamping piece provided on an endless chain, FIG. 5 is an assembled perspective view thereof, and FIG. 6 is a second A perspective view of a main part of another embodiment of the adjustment mechanism for the interval n between the linear running portions 2, 25 of the endless chains 3, 3' according to the third invention, and FIG. 7 is a perspective view of the lead according to the third invention. FIG. 8 is a plan view of one embodiment of the frame finishing device, and FIG. 8 is a side view of the rotating body of the reversing device, in which 1 is a linear transfer path, 2, γ, 2'', 2''' are linear traveling portions, 3, 3', 3'' are endless chains, 31 is the return side of the endless chain 3 of the third invention, 19, 19
' is a clamping piece, 19 is a clamping groove, 23 is a reversing device, 25 is a rotating body, 26 is a through hole, 27 and 28 are grooves, A is a lead frame, B is a synthetic resin containing an electronic element, O -0 is the center axis of the chain wheels 5 and 7, 01-01 is the first
The center line of the transfer path, 02-02 is the central axis of the second transfer path, A and A1 indicate the lead frame receiving side, and Otsu and Otsu 1 indicate the lead frame sending side, respectively.

Claims (1)

[Scope of Claims] 1. A lead frame A molded with synthetic resin B containing electronic elements has a pair of endless wires on both sides of a linear transfer path 1 having linear running portions 2 and 2', respectively. chain 3
, 3' are provided to rotate continuously or intermittently in opposite directions at the same speed and symmetrically about the center line O_1-O_1 of the transfer path 1, and the endless chains 3, 3
On the outer periphery of the lead frame A, clamping pieces 19 and 19' having clamping grooves 19'' capable of elastically clamping the sides of the lead frame A are arranged at a constant interval m and facing each other on the pair of endless chains 3 and 3'. At the lead frame receiving side of the pair of endless chains, clamping pieces 19, 19 are provided on the sides of the lead frame.
' approaches, the clamping grooves 19'' of the clamping pieces 19, 19' sequentially clamp the sides. 19, 19' are gradually moved away from each other, and processing heads for blasting, washing, etc. are installed in the order of the process above the transfer path 1. A pair of endless chains 3 with linear running portions 2 and 2', respectively, are placed on both sides of the linear transfer path 1 of the molded lead frame A.
, 3' are provided so as to rotate continuously or intermittently in opposite directions at the same speed and symmetrically about the center line O_1-O_1 of the transfer path 1, and on the outer periphery of the endless chain. The clamping pieces 19, 19' having clamping grooves 19'' capable of elastically clamping the sides of the lead frame A are spaced at a constant interval m.
and provided oppositely on the pair of endless chains 3, 3',
At the lead frame receiving side of the pair of endless chains, the clamping pieces 19, 19' approach the sides of the lead frame, and the clamping grooves 19'' of the clamping pieces 19, 19' sequentially clamp the sides. At the lead frame delivery side B of the pair of endless chains, the clamping pieces 19 and 19' are made to gradually move away from the sides of the lead frame, and above the transfer path 1 there is a processing head for blasting, washing, etc. are installed in the order of the steps, and the pair of endless chains 3, 3' are configured such that at least the distance n between the linear running portions 2, 2' can be adjusted widely or narrowly. 3 A pair of endless chains 3 having linear running portions 2 and 2', respectively, are placed on both sides of the linear transfer path 1 of the lead frame A molded with synthetic resin B containing electronic elements.
, 3' are provided to rotate intermittently in opposite directions at the same speed and symmetrically about the center line O_1-O_1 of the transfer path, and the lead frame A is provided on the outer periphery of the endless chain. Clamping pieces 19, 19' having clamping grooves 19'' capable of elastically clamping the sides of the chain are provided facing each other on the pair of endless chains 3, 3' at a constant interval m, and the leads of the pair of endless chains are On the frame receiving side instep, the clamping pieces 19, 19' approach the sides of the lead frame so that the clamping grooves 19'' of the clamping pieces 19, 19' sequentially clamp the sides, and a pair of endless At the lead frame delivery side B of the chain, the clamping pieces 19 and 1 are placed from the side of the lead frame.
9' gradually move away from each other, processing heads for blasting, water washing, etc. are installed above the transfer path 1 in the order of processes, and
One of the endless chains 3, 3' of the pair of endless chains 3 has a return side 3_1 as a linear running part parallel to the linear running part 2, and the center of the chain wheels 5, 7 of the one endless chain 3 is Another endless chain 3'' is provided point-symmetrically about the center point M of the axis O-O, and the running direction and speed of the return side 3_1 of the one endless chain 3,
The running direction and speed of the linear running portion 2'' of the other endless chain 3'' are the same to form a linear transfer path 1' for the lead frame A, and the transfer path includes the first (I) and the second (II
), and a lead frame reversing device 23 is installed between the lead frame sending side B of the first transfer path I and the lead frame receiving side A' of the second transfer path II,
The reversing device is provided with a rotating body 25 that rotates around a shaft 24 that is parallel to the first and second transfer paths I and II and is provided between both transfer paths I and II. Transfer route I
The central axis O_1-O_1 of and the central axis O of the second transfer path II
Through holes 26, 26 are provided on _2-O_2, and the through holes 26
, 26 have grooves 27, 28 for receiving lead frames.
An extrusion device 29 is provided on the central axis O_2-O_2 of the second transfer path II to push the lead frame received in the through hole 26 to the lead frame receiving side instep of the second transfer path II.
A lead frame finishing apparatus characterized in that above the second transfer path II, processing heads for blasting, washing, etc. are installed in the order of the processes in the same manner as in the first transfer path I.