JPH052491Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial use)
The present invention relates to a lead frame transport device for transporting lead frames.

(Prior art) Generally, a lead frame is held at both ends by a conveyor belt and transported to a deburring device, where it is deburred by the pressure of powder and granules injected from a deburring spray gun. There is.

[Problems to be solved by the invention] However, in the conventional lead frame conveying device, since both ends of the lead frame are only held between the conveyor belt, processing pressure is applied to the lead frame when deburring the lead frame. If this happens, the lead frame may bend or the grip may come off and the lead frame may fall.

To prevent this, some methods have been put into practical use to guide the lead frame using a fixed lead frame bending prevention guide, but since the lead frame bending prevention guide is stationary, This has the disadvantage that scratches tend to occur on the surface of the lead frame that comes into contact with the lead frame, resulting in poor product quality.

The present invention has been proposed in view of the above-mentioned conventional drawbacks, and even when the lead frame is transported to a deburring device, the lead frame will not bend or the lead frame will not come off the grip and fall. There are no scratches on the surface of the lead frame.
It is an object of the present invention to provide a lead frame conveying device that can stably perform deburring.

[Structure of the invention] (Means for solving the problems) In order to solve the above problems, the present invention includes a pair of frames equipped with guides that guide both ends of the lead frame, and a pair of frames arranged parallel to the frames. is,
Two feeding bars supported rotatably and movably in the axial direction, a conveying cylinder that reciprocates both feeding bars in the axial direction, and each feeding bar with its base end spaced apart at a predetermined interval. A plurality of arms are fixed to the lead frame, and have a plurality of arms on the free end side that have transport claws and lead frame bending prevention guides that grip the lead frame from above and below in the longitudinal direction in the transport direction, and each feed bar works in conjunction with the operation of the transport cylinder. A lead frame transfer device is constructed by providing an arm opening/closing cylinder for rotating the lead frame.

[Operation] Since the lead frame conveyance device of the present invention is constructed as described above, when the feed bar is advanced by the conveyance cylinder with the arm closed by the arm opening/closing cylinder, the lead frame is advanced by a predetermined pitch by a conveying claw and lead frame bending prevention guide, and deburring is performed by a deburring device at a predetermined position. However, at this time, both ends of the lead frame are guided by the frame guide, but the center part of the lead frame is held by the conveyance claw and lead frame bending prevention guide, so the processing pressure during deburring is The lead frame will not bend or fall. Furthermore, when the feed bar is moved backward by the transfer cylinder, the arm is opened by the arm opening/closing cylinder, so the transfer claw and lead frame bending prevention guide is released from the lead frame and returns to its original position. Return. Next, the arm is closed again by the arm opening/closing cylinder. Therefore, by repeating these operations, the lead frame is conveyed one pitch at a time to the deburring device and the burrs can be cleanly removed.

(Example) Hereinafter, the present invention will be specifically described based on an example shown in the drawings.

FIG. 1 is a plan view of a lead frame conveying device according to an embodiment of the present invention, and FIG. 2 is a side view thereof.

In the figure, 1 is a lead frame, 2 is a pair of frames equipped with guides 3 that guide both ends of the lead frame 1, and the lead frame 1 is conveyed from left to right as shown by the arrow, and is injected in the range shown by L. Deburring is now being done with a gun.

Next, FIG. 3 is a sectional view taken along the arrow line AA in FIG. 2. As is clear from FIG. 3, each of the pair of frames 2 is supported by a block 4, and each block 4 is supported by a frame 2.
It is slidably and non-rotatably screwed into the left-hand screw 5a and right-hand screw 5b of a screw shaft 5 arranged orthogonally at the front and back of the , frame 2
By arbitrarily adjusting the interval between the lead frames 1 and 2, it is possible to freely respond to various changes in the width of the lead frame 1.

Next, FIG. 4 is a sectional view taken along the arrow line B-B in FIG. 2, FIG. 5 is a partially omitted plan view of FIG. 4 when viewed from above, and FIG. is the first
It is a sectional view taken along the arrow line C-C in the figure.

In the figure, reference numeral 7 denotes two feed bars placed parallel to the lead frame 2, which are rotatably attached via bearings 9 to a pedestal 8 that supports a screw shaft 5 that adjusts the distance between the frames 2-2. It is supported so as to be movable in the axial direction. Reference numeral 10 designates an arm that can be opened and closed, and its base end 11 is fixed to each feed bar 7 at a predetermined interval with bolts 12. Lead frame 1
A lead frame bending prevention guide 13 is provided which serves as a conveying claw and serves as a lead frame bending prevention guide for pinching and releasing the central portion of the lead frame.

Next, FIG. 7 is an enlarged view of the Y portion in FIG. 1.

In the figure, reference numeral 14 denotes a conveying cylinder that operates in response to a pulse signal.The cylinder 14 and the ends of both feed bars 7 are connected and supported via a bracket 15, and when the conveying cylinder 14 is activated, , both feed bars 7 can reciprocate in the axial direction by exactly the pitch of the lead frame 1.

Next, FIG. 8 is an end view with a part omitted as seen from the direction of arrow Z in FIG. 2, and FIG. 9 is a side view of FIG. 8.

In the figure, reference numeral 16 denotes a link whose one end is fixed to the end of each feed bar 7 and the other end is connected to the arm opening/closing cylinder 17.
operates in conjunction with the transport cylinder 14, and when the arm opening/closing cylinder 17 operates, both feed bars 7 rotate, and a plurality of arms 10 fixed to both feed bars 7 open and close at the same time. ing.

Next, FIG. 10 is a sectional view taken along the arrow line D-D in FIG. 1, FIG. 11 is a plan view of FIG. 11 is a right side view, and FIG. 13 is a sectional view taken along the line E--E in FIG. 12. In the figure, reference numeral 18 indicates a guide groove provided in the guide 3, and both end edges of the lead frame 1 are guided along this guide groove 18. Inside the guide groove 18, a glue-like spring plate 19 is attached by a spring 20. Both ends of the lead frame 1, which is pressed and inserted and guided in the guide groove 18, are pressed by the spring plate 19 to absorb any wobbling and to be guided smoothly. . However, the spring plate 19
The pressing force can be arbitrarily adjusted by adjusting the screw 21.

In the lead frame transfer device of this embodiment having the above configuration, the arm opening/closing cylinder 17
When the feed bar 7 is rotated via the link 16 and the arm 10 is closed, the lead frame 1 is held at its center by the conveying claw/lead frame bending prevention guide 13. .
In this state, the lead frame transport cylinder 14
When the feed bar 7 is moved forward by operating the feed bar 7, the lead frame 1 moves its both edges along the guide groove 18 of the guide 3, absorbing any wobbling with the spring plate, and moves the lead frame 1 to the conveying claw/lead frame bending prevention guide 13.
This causes the robot to move forward by a predetermined pitch. Note that the advanced lead frame 1 is deburred by a spray gun at a predetermined position, but even if processing pressure is applied to the lead frame 1, both ends of the lead frame 1 are only guided by the guides 3. Since the central portion is held by the lead frame bending prevention guide 13 which also functions as a transport claw, the lead frame 1 will not bend or fall. However, if the processing pressure from the injection gun is applied from above, the lower transport claw/lead frame bending prevention guide 13 is used, and if the processing pressure from the injection gun is applied from below, the upper transport claw/lead frame bending prevention guide 13 is used. The central part of the lead frame 1 is held by the lead frame bending prevention guide 13, and the conveying claw/lead frame bending prevention guide 13 on the side where processing pressure is applied is opened or omitted so that it does not get in the way of the deburring process. You can prevent this from happening. Next, when the deburring process is completed, the arm opening/closing cylinder 17 is operated and the feeding bar 7 is rotated in the opposite direction via the link 16.
0 is open, and the lead frame 1 is opened. Therefore, in this state, lead frame 1
When the conveyance cylinder 14 is operated and the feed bar 7 is moved backward, the lead frame 1 remains stationary with its both ends held by the guides 3, and the lead frame 1 is fed with only the arm 10 open. It will return to its original position together with the working bar 7. Therefore, if the arm 10 is closed again from this state and the operation of advancing the feeding bar 7 is repeated, the lead frame 1 will be sequentially transported and deburred. At this time, even if the transport claw/lead frame bending prevention guide 13 holds the center portion of the lead frame 1, it does not come into contact with the surface of the lead frame 1, so no scratches will occur on the surface of the lead frame 1. do not have. It goes without saying that the shape and dimensions of the conveyance claw/lead frame bending prevention guide 13 are optimally designed depending on the shape and size of the lead frame 1 to be conveyed.
In addition, the transfer cylinder 14 that reciprocates the feed bar 7 and the arm opening/closing cylinder 17 that rotates the feed bar 7 are configured in advance by a microcomputer or the like according to a time schedule according to the pitch of the lead frame 1, deburring speed, etc. It is desirable to set the following so that even if the type of lead frame 1 changes, it can be dealt with immediately.

[Effects of the Invention] As specifically explained above, according to the lead frame conveying device of the present invention, even when processing pressure is applied to the lead frame 1 during deburring, both edges are guided by the guide. Since the central portion of the lead frame is held by the conveying claw and lead frame bending prevention guide, the lead frame will not bend or fall.
In addition, the transport claw and lead frame bending prevention guide is
By simply holding the center portion of the lead frame, the surface of the lead frame does not move while in contact with it, so no scratches occur on the surface of the lead frame. Furthermore, the mechanism is relatively simple and maintenance and inspection are easy. It has many advantages such as, and can provide a lead frame conveying device that is extremely effective in practice.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a lead frame conveying device according to an embodiment of the present invention, and FIG. 2 is a side view thereof.
3 is a cross-sectional view taken along the arrow A-A line in FIG. 2, and FIG. 4 is a cross-sectional view taken along the arrow B--
A cross-sectional view taken along line B; Fig. 5 is a plan view of Fig. 4 viewed from above with a portion omitted; Fig. 6 is a cross-sectional view taken along line C-C in Fig. 1. A sectional view, Figure 7 is an enlarged view of the Y section in Figure 1, and Figure 8
The figure is an end view with a part omitted as seen from the direction of arrow Z in FIG. 2, and FIG. 9 is a side view of FIG.
Figure 0 is a sectional view taken along the arrow line D-D in Figure 1, Figure 11 is a partially omitted plan view of Figure 10 when viewed from above, and Figure 12 is the right side of Figure 11. The side view and FIG. 13 are taken in the direction of arrow E- in FIG. 12.
FIG. 3 is a cross-sectional view taken along line E. 1... Lead frame, 2... Frame, 3...
...Guide, 4...Block, 5...Screw shaft, 5a
...Left-hand thread, 5b...Right-hand thread, 6...Motor, 7
...Feeding bar, 8... Frame, 9... Bearing, 10
... Arm, 11 ... Base end, 12 ... Bolt,
13... Transfer claw and lead frame bending prevention guide, 14... Transfer cylinder, 15... Bracket, 16... Link, 17... Arm opening/closing cylinder, 18... Guide groove, 19... Spring plate,
20...Spring, 21...Screw, L...Deburring range by injection gun.

Claims (1)

[Scope of utility model registration request] A pair of frames equipped with guides that guide both ends of the lead frame, two feed bars arranged parallel to the frames and supported so as to be rotatable and movable in the axial direction, and two feed bars. A transport cylinder that moves back and forth in the axial direction, and a transport claw and lead frame whose base end is fixed to each feed bar at a predetermined interval and whose free end grips the lead frame from above and below in the longitudinal direction in the transport direction. 1. A lead frame transfer device comprising a plurality of arms having anti-bending guides and an arm opening/closing cylinder that rotates each feed bar in conjunction with the operation of the transfer cylinder.