JPH04137038U - Lead frame pick-up device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to accurately pick up a lead frame regardless of the warped state of the lead frame after resin sealing. [Structure] Lead frames are stacked in a predetermined number and set one by one, starting from the top one at a time.The lead frame is held down from above by a frame holder formed in approximately the same shape as the lead frame, and the lead frame is chucked and picked up from the width direction. In a frame pickup device, movable plates 22 and 24 are provided at both longitudinal ends of a fixed plate 20 that presses the frame with movable plates 22 and 24 whose tips are movable upward, and the fixed plate and the movable plate are normally attached to the frame holder. It is characterized in that the distal end side of the movable plate is movably biased so that the pressing surface becomes a flat surface.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a lead frame pickup device.

0002

[Conventional technology]

When manufacturing resin-sealed semiconductor devices, lead frames are sealed with resin. After that, remove unnecessary parts such as gates or runners, remove dam bars, and bend leads. etc. to produce a product. Here, bend the lead frame after resin sealing. When setting the resin-sealed lead frames in a processing machine such as Stack them in the lead frame and pick them up one by one using the pick-up device on the lead frame. The material is then placed in a container and transferred to the processing machine.

0003 By the way, resin-sealed lead frames suffer from shrinkage between the sealing resin and the lead frame. Warpage may occur due to rate differences; stacking lead frames as described above When set, the lead frame will be warped as shown in Figure 6 or Figure 7. Can be stacked. Recently, lead frames have increased in number of pins, and matrices Forming multiple resin mold parts on a lead frame like a box frame This may cause large warpage in the lead frame after resin sealing, and stacking In some cases, there may be considerable warpage.

0004 The lead frame pickup device described above picks up stacked leads as shown in Figure 6. Hold the lead frame 10 from above with the frame holder 12, and Starting from frame 10, the frames are chucked one by one from the width direction and transferred to the processing side. Fray The lead frame holder 12 holds the lead frame 10 by gripping it with the chuck 14. The frame 10 is sent to the processing side without being warped.

[0005]

[Problem that the idea aims to solve]

By the way, the lead frame pick-up device described above can be used to pick up stacked lead frames. Insert your nail into the gap created between the top and bottom due to the thickness of the resin-sealed part and chuck it. Therefore, if the lead frame is warped when stacked, the frame will be pushed. Even when lowering the 12, it may not be possible to chuck accurately. For example, if the central part is curved upwards as shown in Figure 6, , if the chuck 14 is positioned too far outside the lead frame, the lead frame will It was not possible to chuck the frame, and the center part was concave as shown in Figure 7. If they are piled up, the frame holder 12 will not be able to lower down enough and the chuck 14 will not be able to remove it. cannot grip the board frame. Therefore, in such cases the product Adjust the position of the chuck 14 toward the center or toward the outside according to the We are making it possible to

[0006] Further, the frame presser 12 can press down the lead frame. It works to correct the warpage of the lead frame and grip it, but it Even if you press the lead frame in a stacked state, the frame presser 12 will not work as shown in Figure 7. The result is a bridge-like shape, and the lead frame cannot be chucked accurately. child Therefore, the number of lead frames stored in the magazine and stacked is limited to a small number. The warp of the lead frame is corrected by the frame holder 12, and the lead frame is In some cases, it can be chucked.

[0007] However, it is not possible to limit the number of lead frames that can be accommodated in a magazine. This is inefficient and also requires a head to chuck the lead frame to fit the product. It is troublesome to replace. Also, the lead frame may be warped to some extent. If this happens, the chuck cannot be reliably chucked even if you change the chuck position. There was a problem in that it was easy for mistakes to occur. In addition, the conventional lead frame chuck device uses an air cylinder as the chuck part. Although it is air-driven, it has many parts and requires an air circuit. There were also some problems. Therefore, this invention was devised to solve the above problems, and its purpose is to solve the above problems. The key is to ensure that the lead frame is secure even if the lead frame has considerable warpage. The lead frame can be picked up and transferred reliably. However, we are trying to provide a pick-up device for lead frames that can be It is.

[0008]

[Means to solve the problem]

The present invention has the following configuration to achieve the above object. In other words, set the lead frames stacked in a predetermined number, and place the lead frames on top. Place the lead one by one using a frame holder formed in almost the same shape as the lead frame. Hold the frame from above and chuck it from the width direction to pick it up. In a lead frame pickup device, the frame holder is A movable plate is provided at both longitudinal ends of the fixed plate that holds the arm, with the tip side movable upward. At the same time, the frame holding surfaces of the fixed plate and movable plate should always be flat. It is characterized in that the distal end side of the movable plate is movably biased.

[0009]

[Effect]

When pressing the lead frame from above with the frame holder, the frame is Because both ends of the lead frame are movable, for example, the center of the lead frame may be dented. If it is warped, both ends of the movable plate will lift up and hold the frame down. to accurately test the lead frame by lowering it until the center part touches the lead frame. jack. If the center of the lead frame is curved upward, the frame The center part of the presser foot contacts the lead frame and chucks it.

0010

【Example】

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a lead frame pickup device according to the present invention. Figure 2 is a front view of the pickup device, and Figure 2 is the frame of the pickup device. It is a figure which looked at the presser from the plane direction. The lead frame pickup device according to the present invention holds down the lead frame. The frame retainer is characterized in that both ends of the frame retainer are movable in the vertical direction. In FIG. 1, 20 is a fixing plate for holding the frame, and 22 and 24 are attached to the fixing plate 20. It is a movable plate that can be moved upward. The movable plates 22 and 24 have proximal ends as shown in FIG. The part supports the fixing plate 20 via the shaft 26 so as to be movable upwardly, and the shaft 26 By extrapolating the spring 28, the plate surface of the fixed plate 20 and the plate surface of the movable plates 22 and 24 are always connected. It is biased so that it becomes one plane. The biasing direction of the spring 28 is the movable plate 22, 24 is directed downward in FIG. 1. In the embodiment, the fixing plate 20 and the The moving plates 22 and 24 constitute a frame holder.

[0011] A support rod 30 is erected on the upper surface of the fixed plate 20, and the upper end of the support rod 30 is It is inserted into the push plate 32. The push plate 32 is used when picking up the lead frame. It is driven up and down and moved laterally to the position where the lead frame is sent to the processing machine. 34 is Between the fixed plate 20 and the pushing plate 32 by a coil spring inserted into the support rod 30 is being fired. 36 is a stopper that regulates the distance between the pushing plate 32 and the fixed plate 20; be.

0012 40 is a chuck mechanism for chucking the lead frame; A pair of fixing plates are provided on the upper surface of the fixing plate 40. Figure 3 shows the chart from the width direction of the lead frame. An explanatory diagram showing the locking mechanism is shown. 42 holds the lead frame 10 from both sides in the width direction. 44 is an air cylinder for opening and closing the chuck jaw 42; 46 is an air cylinder for opening and closing the chuck jaw 42; This is a spring that urges the chuck claw 42 in the chuck direction. The spring 46 The base position of the L-shaped chuck jaw 42 is constantly pushed up, and the chuck jaw 42 is The tip side is biased in the direction of narrowing (in the direction of gripping the lead frame).

[0013] The pick-up device for the lead frame of the above example has the tip side of the frame holder. Since it is composed of movable plates 22 and 24, the center part of the lead frame is recessed. If the movable plates 22 and 24 are stacked in a warped state, the leading ends of the movable plates 22 and 24 The fixing plate 20 touches the end of the lead frame and lifts up, and the fixing plate 20 is in the center of the lead frame. It descends to a position where it contacts the lead frame and grips the lead frame. After gripping the lead frame, the chuck jaws 42 are driven by air to release the lead frame. The movable plates 22 and 24 are returned to their original positions by grasping the frame and lifting the frame holder. Return to the flat surface position, correct the warpage of the lead frame, make it flat, and transfer it to the processing machine. Transport. As shown in Figure 6, if the lead frame is warped with a convex central part, The tips of the moving plates 22 and 24 do not contact the lead frame, and the frame retainer is flat. Chuck the lead frame in this state.

[0014] In this way, according to the lead frame pickup device of this embodiment, the frame By making both ends of the presser movable, the lead frame can be oriented in either direction. It is possible to accurately pick up a lead frame even in a warped state. Also, If the lead frame is warped considerably due to the movable action of the movable plates 22 and 24, Reliable pickup is possible even when the

[0015] Note that Figures 4 and 5 show an air-driven chuck mechanism for the lead frame. Here is an example where there is no. In this example, as shown in FIG. 5, the chuck claws 42 are formed in an L shape. The base is pushed up by the spring 46, and the chuck claws 42 are always moved in the chuck direction (lower At the same time, the push rod 50 is brought into contact with the upper surface of the chuck jaw 42. and set it up. The push rod 50 is provided in contact with the lower surface of the push plate 32 as shown in FIG. When the pressing plate 32 presses the frame presser, it presses the base position of the chuck claw 42. It is configured to press. According to the lead frame pickup device of this embodiment, the lead frame can be picked up When backing up, the push plate 32 presses the frame holder, and the frame holder By pressing the stacked lead frame, the coil spring 34 will be slightly The space between the pushing plate 32 and the fixed plate 20 is compressed, and the pushing rod 50 is chucked. The base position of the pawl 42 is pressed, thereby causing the chuck to resist the biasing force of the spring 46. The hook claw 42 opens. With the chuck claws 42 open, the push plate 32 rises to its original position. When the push rod 50 moves upward, the urging force of the spring 46 simultaneously causes the push rod 50 to move upward. Since the chuck claws 42 narrow down and pinch the lead frame 10 from the width direction, the frame With the lead frame gripped by the presser and chuck claws 42, the frame presser is raised. rise In this way, the lead frame is picked up.

[0016] In the device shown in FIGS. 4 and 5, the main body portion of the push plate 32 and frame holder is By configuring the chuck jaws 42 to open and close in relation to the operation, the air circuit The configuration of the chuck mechanism can be simplified compared to the case where the chuck mechanism is used. Also In the case of this method, the protrusion length of the push rod 50 and the shape of the chuck jaw 42 are designed Therefore, there is an advantage that the opening/closing amount of the chuck can be easily set.

[0017]

[Effect of the idea]

According to the lead frame pickup device according to the present invention, as described above, Regardless of the direction of lead frame warpage after resin sealing, Even when the amount of warpage is large, the lead frame can be accurately chucked and the lead frame This makes it possible to eliminate chuck errors when transporting the frame. Also, the product It may be necessary to make adjustments for the chuck or replace the chuck head depending on the This has significant effects such as improved workability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a lead frame pickup device.

FIG. 2 is an explanatory diagram of the frame presser viewed from a plane direction.

FIG. 3 is an explanatory diagram showing the chuck mechanism of the embodiment.

FIG. 4 is an explanatory diagram showing another example of a lead frame chuck mechanism.

FIG. 5 is an explanatory diagram showing a chuck mechanism.

FIG. 6 is an explanatory diagram of a warped state and a pickup state of the lead frame.

FIG. 7 is an explanatory diagram of a warped state and a pickup state of the lead frame.

[Explanation of symbols]

10 Lead frame 12 Frame holder 14 Chuck 20 Fixed plate 22, 24 Movable plate 28 Spring 30 Support rod 32 Push plate 34 Coil spring 40 Chuck mechanism 42 Chuck jaw 46 Spring 50 Push rod

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[Procedural amendment]

[Submission date] July 25, 1991

[Procedural amendment 1]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 1

[Correction method] Change

[Correction details]

[Figure 1]

[Procedural amendment 2]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction details]

[Figure 2]

Claims (1)

[Scope of utility model registration request] [Claim 1] A predetermined number of lead frames are stacked and set, and one by one, starting from the top, the lead frame is held down from above by a frame holder formed in approximately the same shape as the lead frame, and is chucked from the width direction to be picked up. In a pick-up device for a lead frame, the frame presser is provided with a movable plate at both longitudinal ends of a fixed plate that presses the frame so that its tip side can be moved upward, and the frame presser is normally mounted on the frame presser surface of the fixed plate and the movable plate. A pick-up device for a lead frame, characterized in that the tip side of a movable plate is movably biased so that the lead frame becomes a flat surface.