JPH0254940A - Positioning device of lead frame - Google Patents

Abstract

PURPOSE:To improve positioning accuracy of a lead frame and processing capacity by inserting the lead frame between a transportation rollers for positioning. CONSTITUTION:A lead frame 1 is pushed out of a container part 3 with a rod 2. If a point 1a of the frame 1 is detected by a sensor 9, a roller 13 is rotated by a driving means 16 and a driving device 12, and the point 1a is gripped in between rollers 13, 15. If the rod 2 is detected by the sensor 8, the roller 13 is stopped. At this time, the frame 1 is pushed inside a transportation device 11 through forward operation of the rod 2. Then a detecting means 18 detects passage of a specified time after the sensor 8 detects the rod 2, and the forward operation of the rod 2 is thereby stopped. The frame 1 is pushed in between rollers 13, 15 and positioned in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lead frame positioning device for positioning a lead frame to a sensor for detecting the front and back directions, front and back directions, etc. of a lead frame for semiconductor device assembly.

[Conventional technology]

A conventional lead frame positioning device of this type is constructed as shown in FIG.

FIG. 4 is a sectional view showing a lead frame positioning device with a lead frame forward/reverse detection device. 2 is a drive device (not shown) fixed to the storage section 3 side;
It is connected to and can move freely back and forth. Reference numeral 4 denotes a roller for transporting the lead frame 1, which is rotatably connected to a drive device (not shown) and connected to a pulley 6 via a belt 5.

Reference numeral 7 denotes a pressing roller that presses the lead frame 1 pushed out by the pushing rod 2 against the roller 4, and is provided so as to be movable toward and away from the roller 4. Reference numeral 8 denotes a pushing rod sensor for detecting the position of the pushing rod 2, which is connected to the pushing rod driving device and detects when the pushing rod 2 reaches the frontmost position and the tip 1a of the lead frame 1 is placed on the roller 4. The push rod 2 is configured to be stopped when placed. Reference numeral 9 denotes a forward/reverse reversal sensor for detecting the front/back or front/back orientation of the lead frame 1, which is composed of a light source 9a and a light receiving part 9b, and includes a diagonal hole for orientation detection (not shown) formed in advance in the lead frame 1. It detects whether the direction of the lead frame 1 is correct by detecting whether the direction of the lead frame 1 is correct by detecting that the light has passed through the lead frame 1.The light source 9a and the light receiving section 9b are It is arranged at a position corresponding to the shallow hole of the lead frame 1 sent.

Next, the operation of the lead frame positioning device with the lead frame forward/reverse detecting device configured as described above will be explained. First, the lead frame 1 is pushed out from the lead frame storage section 3 toward the roller 4 side by the pushing rod 2. When the push rod 2 is advanced to a predetermined position, it is detected by the push rod sensor 8 and stopped. As the push rod 2 is stopped, the lead frame 1
is positioned at a position corresponding to the forward/reverse reversal sensor 9 with its tip 1 a placed on the roller 4 . In this state, the forward/reverse reversal sensor 9 determines whether the lead frame 1 is forward or reverse.

Thereafter, the press roller 7 is lowered to sandwich the lead frame 1 between it and the roller 4. Next, by rotating the roller 4, the lead frame 1 is transferred in the direction A in the figure. By repeating the above operations, the lead frames 1 in the lead frame storage section 3 are sequentially transported.

[Problem to be solved by the invention]

However, in the conventional lead frame positioning device configured as described above, when the push rod 2 stops, the lead frame 1 does not stop at the same time, and may be stopped with a slight shift in the feeding direction due to inertia. . In such a case, there is a problem that the forward/reverse reversal sensor 9 makes a detection error.

Also, in order to prevent the lead frame 1 from shifting, push out the push rod 2.
If the speed is reduced, a problem arises in that the processing capacity of the device is reduced.

[Means to solve the problem]

In the lead frame positioning device according to the present invention, a pair of upper and lower transfer rollers that are provided so as to be able to move toward and away from each other are urged in a direction toward each other, and the rollers are rotated to sandwich and feed the lead frame between both rollers. a transfer device; a pusher that pushes the lead frame to a positioning position to attach it to the transfer device; a sensor that detects that the leading end of the lead frame is caught between the rollers of the transfer device; and a pusher connected to the sensor; and a control device that drives the rollers when feeding the lead frame and stops the rollers when the leading end of the lead frame is caught between the rollers.

[For production]

The lead frame is pushed and positioned between the transfer rollers by the pusher, and since the transfer rollers act as resistance, when the pusher is stopped, the lead frame is also stopped at the same time.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view showing the lead frame positioning device of the present invention, showing the state before the lead frame is sandwiched between the transfer rollers, and FIG. 2 shows the state where the lead frame is sandwiched between the transfer rollers. FIG. 3 is a sectional view showing the lead frame positioning device of the present invention in a state where the lead frame is positioned. In these figures, the same or equivalent members as those explained in FIG. 4 are given the same reference numerals, and detailed explanation will be omitted here.

In these figures, reference numeral 11 denotes a transfer device for transferring the lead frame 1, and this transfer device includes a roller 13 connected to a drive device 12 and rotatably provided, and a roller 1.
The press roller 15 is provided so as to be able to move toward and away from the roller 3 and is biased toward each other by a lever spring 14. By rotating the roller 13, the press roller 15 is also brought into contact with the roller 13. The rollers 13 and 15 rotate at the same time, sandwiching the lead frame 1 between them and transporting it.

Further, the drive device 12 is connected to drive means 16 for controlling the operation of the transfer device 11. In addition to being connected to the drive device 12, the drive means 16 is also connected to a push rod drive device 17 and a detection means 18 connected to a push rod sensor 8 and a forward/reverse reversal sensor 9. 9 detects the presence or absence of the lead frame l, and when the push rod sensor 8 does not detect the push rod 2, the drive device 12 is activated to put the transfer device into operation, and the push rod sensor 8 detects the push rod 2. When this occurs, the drive device 12 is stopped, and the push rod drive device 17 is driven until the detection means 18 detects 0.5 seconds after the push rod sensor 8 is activated.

Next, the operation of the lead frame positioning device configured as described above will be explained.

First, as shown in FIG. 1, the lead frame 1 is pushed out from the lead frame storage section 3 by the pushing rod 2. When the front end portion 1a of the lead frame 1 is detected by the forward/reverse reversal sensor 9, the driving means 16 gives a starting command to the driving device 12, and the roller 13 is rotated. Then, the lead frame 1 pushed by the pushing rod 2 has its tip 1a
is sandwiched between both rollers 13.15. Next, as shown in FIG. 2, when the pushing rod 2 that has moved further forward is detected by the pushing rod sensor 8, the driving means 16
gives a stop command to the drive device 12, and the roller 13 is stopped. At this time, the lead frame 1 is pushed into the transfer device 11 as the pushing rod 2 continues to move forward. Next, the detection means 18 detects 0.0 after the push-out rod sensor 8 detects the push-out rod 2.
When it is detected that 5 seconds have elapsed, the driving means 16 gives a stop command to the pushing rod drive device 17, and the forward movement of the pushing rod 2 is stopped, as shown in FIG.

Therefore, the lead frame 1 is pushed between both rollers 13.15 by the push rod 2 and positioned, and since the rollers 13.15 act as resistance, when the push rod 2 is stopped, the lead frame 1 is also stopped at the same time. be done.

In the above embodiments, an example was shown in which the press roller 15 was biased by a spring, but the present invention is not limited to such a limitation. The same effect can be obtained. Further, in the above embodiment, the transfer path of the lead frame 1 is in one line, but the push rod 2 and the transfer device! 11
A similar effect can be obtained even if a plurality of lead frames 1 are arranged in parallel and the transport paths of the lead frames 1 are arranged in parallel.

〔Effect of the invention〕

As explained above, according to the present invention, a pair of upper and lower transfer rollers that are provided so as to be able to move toward and away from each other are urged in a direction toward each other, and the rollers are rotated to sandwich the lead frame between both rollers. A transfer device for sending the lead frame, a pusher for attaching the lead frame to the transfer device by pushing it to a positioning position, a sensor for detecting that the tip of the lead frame is caught between the rollers of the transfer device, and connected to the sensor, The lead frame is pushed between the conveying rollers by the pusher, and is equipped with a control device that drives the roller when the lead frame is sent by the pusher and stops the roller when the leading end of the lead frame is caught between the rollers. Since the conveying rollers act as resistance, when the pusher is stopped, the lead frame is also stopped at the same time. Therefore, the positioning accuracy of the lead frame is improved, and since the transfer rollers are rotated when the lead frame is inserted into the transfer device, processing capacity can be improved without damaging the lead frame. Can be done. Further, since the lead frame positioning device of the present invention can be obtained with a simple configuration, it also has the effect that it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the lead frame positioning device of the present invention, showing the state before the lead frame is sandwiched between the transfer rollers, and FIG. 2 is a sectional view showing the lead frame before being sandwiched between the transfer rollers. 3 is a sectional view showing the lead frame positioning device of the present invention in a state where the lead frame is positioned; FIG. 4 is a sectional view showing the lead frame positioning device of the present invention with the lead frame positioned; FIG. 4 is a conventional lead frame forward/reverse detection device FIG. l...Lead frame, 2...Extrusion rod, 8
...Pushing rod sensor 11...Transfer device, 13...Roller 15...Pushing roller 1
6... Drive means, 18... Detection means.

Claims (1)

[Claims] A transfer device in which a pair of upper and lower transfer rollers that are movable toward and away from each other are urged in a direction toward each other, and the rollers are rotated to sandwich and feed the lead frame between both rollers, and a transfer device that transports the lead frame to a positioning position. a pusher for attaching the lead frame to the transfer device by pushing; a sensor for detecting that the leading end of the lead frame is caught between the rollers of the transfer device; A lead frame positioning device comprising: a control device that drives the roller and stops the roller when the leading end of the lead frame is caught between the rollers.