JP2945182B2 - Lead frame progressive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead frame progressive feeder.

[0002]

2. Description of the Related Art In a conventional lead frame progressive feeder, a transport mechanism for holding a lead frame and moving the lead frame is formed integrally with a drive mechanism for driving the lead frame in the feed direction. The stage includes only a processing mechanism for punching a lead frame. Therefore, when the lead frame forward feed device is composed of a plurality of processing stages, the lead frame in each processing stage always moves at the same feed pitch because the drive mechanism for driving the lead frame is common.

[0003]

By the way, there are various types of lead frames, and the positions of guide holes and the sizes of the guide holes are different for each lead frame. The position of the feed pin must be set according to each lead frame. As described above, when applying a different type of lead frame to the conventional processing machine, it is necessary to replace or adjust the transport mechanism as well as to exchange the processing mechanism including the mold. There is a problem that the operation becomes complicated. Recently, a very large variety of lead frames have been provided, and the tendency to produce a large number of small-quantity products has been hampered. Therefore, a processing machine capable of easily changing a processing line has been demanded.

[0004] Generally, the processing of a lead frame is constituted by a combination of a plurality of processing stages. The lead frames to be processed are of the same type and the feed pitch of the lead frame in each processing stage can be almost the same, but after resin sealing to the lead frame, the metal part and the resin part of the lead frame The residual stress is generated in the metal part of the lead frame due to the difference in the expansion coefficient of
When the lead frame is processed, the residual stress is released, so the length of the lead frame is small but long. Since high precision is required for lead frame processing, individual feed pitches must be set for each processing stage in accordance with fluctuations in the length of this lead frame. The feed pitch cannot be changed, and, for example, a method is adopted in which an intermediate value of the feed pitch required in each processing stage is used as the moving distance of the driving device. However, this has a problem in that accurate positioning cannot be performed on all of the plurality of processing stages, and burring and product defects occur. In order to solve this problem, it is conceivable to dispose an individual driving device for each processing stage, but the mechanism becomes complicated and costs increase.

The present invention has been made in view of the above problems, and an object of the present invention is to enable various types of lead frames to be easily set, and to feed a fixed size at a predetermined pitch individually for each processing stage. Accordingly, it is an object of the present invention to provide a lead frame progressive feeding device capable of performing required processing.

[0006]

The present invention has the following arrangement to achieve the above object. In other words, in a lead frame progressive feeder that feeds a predetermined size at a predetermined pitch to a processing stage arranged side by side to process the lead frame, a transfer capable of holding the lead frame and feeding the fixed size to process the lead frame. A working stage comprising a mechanism and a processing mechanism having a die and punching the lead frame; and a bridge between the working stages and supporting the lead frame so as to be slidable. It has a support mechanism provided so that the rails face each other in parallel, and a connecting part that can be fitted to the transport mechanism in the processing stage, and moves the transport mechanism in the feed direction of the lead frame in accordance with the processing operation of the processing stage. It has a driving mechanism to drive, the processing accuracy of the lead frame for each processing stage is improved, Wherein the easily setting the frame.

[0007]

A plurality of processing stages each having an integrated support mechanism and processing mechanism are arranged in parallel, and a support mechanism is installed between the plurality of processing stages. The lead frame supported by the support mechanism is lead by a transport mechanism that can set the feed pitch individually by providing a stopper for each processing stage in order to perform predetermined processing by the processing mechanism in each processing stage. Holding the frame, it is arranged at the side position of the transport mechanism, and by driving the transport mechanism with a drive mechanism connected to each transport mechanism, each transport mechanism in multiple processing stages is at an individual feed pitch. You can move. Therefore, the lead frame held by the transport mechanism is also sequentially fed at a feed pitch required in each processing stage.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a top view showing the overall configuration of the lead frame progressive feeding device according to the present invention. First, the configuration will be described with reference to FIG. The lead frame progressive feeding device is roughly divided into a transport mechanism 10 for feeding a lead frame 26 in a fixed size and a lead frame 2 fed in a fixed size.
6, and a support mechanism 16 for guiding and supporting the lead frame 26 when the lead frame is fed by a fixed length.
And a drive mechanism 18 for driving each transport mechanism 10 in the processing stages 14a and 14b.

More specifically, the transport mechanism 10 includes a feed base 22 having a long base rail 20 laid on the upper surface thereof in parallel with the lead frame feed direction, and a feed arm 23 slidably supported by the feed base 22. And The feed arm 23 is slidable on the base rail 20 in the left-right direction when placed on the feed base 22, and has an arm support 24 having a projecting portion 30 protruding from an outer surface thereof. One end is fixed to the upper surface of the arm support base 24 so as to be perpendicular to the longitudinal direction and protrude in the direction opposite to the protruding portion 30, and the lower surface of the other end is guided by the lead frame 26. A feed arm 34 is provided with a needle-shaped feed pin 32 suspended so that the hole and the position are the same. At both ends of the base rail 20, stoppers 28 are fixed to make the moving distance of the arm support 24 in the left-right direction coincide with the feed pitch of the lead frame 26.

The processing mechanism 12 includes a mold 35 for processing the lead frame 26 and a mold driving device 36 for moving the mold 35 up and down. The transport mechanism 10 is fixed to a side surface of the processing mechanism 12,
Processing stages 14a and 14b are configured together with the processing mechanism 12, and the lead frame 26 is fed by a fixed size to a position where the processing mechanism 12 can accurately process the lead frame 26. The support mechanism 16 includes two parallel rails 38 facing each other, a rail support (not shown) for urging and supporting the rails 38 upward, and two parallel rails 38.
And a correction unit (not shown) that changes the interval of the lead frame 26 to the width of the lead frame 26. Each rail 38
A concave groove is provided on the side surface facing the, and the groove can support the lead frame 26 slidably on a plane parallel to the processing surface of the mold 35. A plurality of processing stages 14a and 14b arranged in a straight line
By being erected between the processing stages 14a, 14b
The transport mechanism 10 can transport the lead frames 14a, 14b processed in the above to the next processing stages 14a, 14b.

The drive mechanism 18 is disposed at a side position of the transport mechanism 10 and is formed in one long plate shape integrally connecting the processing stages, and has a concave portion on one side surface in the longitudinal direction. A plurality of connecting rods 40 provided in the same number as the processing stages 14a and 14b, and a shaft provided between the inner wall surfaces of the concave portions of the connecting rods 40, which are slidably inserted parallel to the lead frame transport direction, Similarly, the connecting portion 44 is elastically mounted by being sandwiched from two sides by two springs 42 passed through the same shaft, and is fixed to one end surface of the connecting rod 40 in the longitudinal direction. And a feed drive unit 46 that can reciprocate in the direction. In addition, the connecting portion 44
The planar shape is formed in a U-shape, one end of which is mounted in the concave portion of the connecting rod 40 as described above, and the other end having the concave groove is fitted with the projecting portion 30 of the transport mechanism 10. . The drive mechanism 18 includes a plurality of processing stages 14a, 14
b, and the connecting portion 44 is connected to the corresponding processing stage 14.
a and 14b are fitted with the protruding portions 30 of the transport mechanism 10, and when the feed drive section 46 of the drive mechanism 18 reciprocates, the transport mechanism 10 also reciprocates in conjunction. Normally, the reciprocating pitch of the driving mechanism 18 is equal to the plurality of machining stages 14a, 1
Although the feed pitch is set to be larger than the feed pitch of the transport mechanism 10 in the processing stage 4b, the feed pitch of the transport mechanism 10 in the individual processing stages 14a and 14b is determined by the individual stoppers 28. Repeat the reciprocation. The spring 42 sandwiching the connecting portion 44 of the drive mechanism 18 absorbs a feed pitch error between the processing stages 14a and 14b during the above operation, and leads when the lead frame 26 is clogged in the support mechanism 16. Frame 2
6 protection.

Next, the operation will be described. First, the interval between the rails 38 is adjusted to the width of the lead frame 26 by the correction unit of the support mechanism 16. Lead frame 26 to rail 3
Place on 8. Before the mold driving device 36 in the processing mechanism 12 operates, the lead frame 26 supported on the rail 38 is biased and supported to the upper position by the rail supporting portion. The feed pin 32 of the feed arm 23 passes through the guide hole. At this time, the feed drive unit 46 of the drive mechanism 18 moves the connecting rod 40 to the left, and accordingly, the feed arm 23 in the transport mechanism 10 also moves to the left on the base rail 20 and comes into contact with the stopper 28. Then, it moves leftward by the determined predetermined feed pitch and stops. Thereby, the lead frame 26
Is arranged at a processing position for the next processing. Here, the mold driving device 36 in the processing mechanism 12 operates, and the mold 35 disposed on the lead frame 26 moves downward to perform a predetermined processing on the lead frame 26. At this time, the rail 38 is pushed and lowered when the mold 12 disposed above is driven downward, and the feed pin 32 of the feed arm 23 is pulled out of the guide hole of the lead frame 26. The feed drive unit 46 is connected to the connecting rod 4 for the next transport operation.
Move 0 to the right. Accordingly, the transport mechanism 10 also moves to the right while the mold 35 is engaged. When the transport mechanism 10 completes the rightward movement, the mold 35 rises and returns to the original position again, but with the rise of the mold 35, the rail 38 rises and lifts the lead frame 26.
As a result, the feed pin 32 of the feed arm 23 again passes through the guide hole of the lead frame 26, and preparation for the next transport operation is completed.

The above-described series of operations are repeated, and the lead frame is continuously transported and processed. In the lead frame progressive feeder described above, since the connecting portion of the drive mechanism that drives the feed arm in each processing stage in the left-right direction is held by a spring, the feed pitch of the lead frame set individually for each processing stage Can be absorbed. As a result, the feed drive unit of the drive mechanism can reciprocate the connecting plate with a stroke slightly larger than the maximum value of the feed pitch of the processing stage, and the feed arms in each processing stage can individually set the lead frame. At a feed pitch of. In addition, since the connecting part on the drive mechanism side is provided so as to be sandwiched by the spring in this way, it is possible to absorb the position error. It has no effect. As described above, the preferred embodiment has been described as a lead frame progressive feeding device. However, the present invention is not limited to the above-described embodiment, and it is needless to say that many modifications can be made without departing from the spirit of the invention. It is.

[0014]

According to the lead frame progressive feeder of the present invention, as described above, when processing a lead frame in which the positions of the guide holes and the sizes of the guide holes are different,
It is only necessary to change the processing stage where the processing mechanism including the mold and the transfer mechanism are integrated, and adjust the distance between the support mechanisms, and individually adjust the mold position, change the position of the feed pins and stoppers, and feed There is no need to replace the arm, and the switching operation becomes very easy. In addition, since the lead frame feed pitch can be individually set for each processing stage even with one driving device as in the conventional case, it is possible to cope with a change in the length of the lead frame that occurs during processing. Since the positioning can be performed accurately, it is possible to prevent the occurrence of burring and defective products, and so on.

[Brief description of the drawings]

FIG. 1 is a top view of a progressive device for a lead frame.

FIG. 2 is a side view of a lead frame progressive feeding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Conveying mechanism 12 Processing mechanism 14a, 14b Processing stage 16 Support mechanism 18 Drive mechanism 26 Lead frame 28 Stopper 35 Die 38 Rail 40 Connection rod 44 Connection part 46 Feed drive part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23Q 39/04 B65G 25/06 B65G 47/82 H01L 23/50

Claims (1)

(57) [Claims] 1. A lead frame progressive feeding device for feeding a lead frame at a predetermined pitch to a plurality of processing stages arranged side by side for processing a lead frame, wherein the lead frame is held and a stopper is provided. A transfer mechanism capable of feeding the lead frame at a specific pitch at a specific pitch, a processing stage formed by integrating a processing mechanism for processing the lead frame, and a bridge mounted between the processing stages to guide the lead frame in the feed direction. A support mechanism to support the connection mechanism, a coupling portion that can be fitted to the transfer mechanism in the processing stage,
A drive rod for reciprocating the transport mechanism in the feed direction of the lead frame in accordance with the processing operation of the processing stage, comprising a connection rod slidably mounted on the connection section and a feed drive section for driving the connection rod. And a mechanism for feeding a lead frame.