JP2862999B2 - Lead frame pickup mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a lead frame pickup mechanism for sequentially picking up lead frames stacked in close contact one by one, and a lead capable of reliably picking up stacked lead frames one by one efficiently. A stationary node fixed so as not to move, and a motor that rotates around one end of the stationary node by pivotally connecting one end to one end of the stationary node for the purpose of providing a frame pickup mechanism Joint, one end pivotally connected to the other end of the driving joint, and one end pivotally connected to the middle of the intermediate joint in the axial direction, and the other end pivotable to the other end of the stationary joint. And a pair of four-bar linkages, each of which is composed of a follower connected to each other and arranged in a row so as to face each other and remote from each other; And the intermediate link constitutes the pickup mechanism of the shortest distance is moistened with a slightly narrower conductive pickup claw than the distance between the ends of the lead frame lead frame between the tips during exercise.

Further, a lead frame holding detection mechanism for detecting the presence or absence of electrical continuity between the pickup claws is added to the lead frame pickup mechanism to constitute a lead frame pickup mechanism.

[Industrial applications]

The present invention relates to a lead frame pickup mechanism, and more particularly to a lead frame pickup mechanism capable of efficiently and efficiently picking up stacked lead frames one by one.

The supply of the lead frame to the automatic die bonder has been performed in such a manner that the lead frames stored horizontally and separately from each other in the storage magazine are sequentially extruded one by one in the horizontal direction.

Therefore, in order to reduce the man-hour of die bonding including the work of storing the lead frame in the storage magazine,
It is extremely important to efficiently store the lead frame in the storage magazine.

[Conventional technology]

Next, a method of picking up a lead frame will be described with reference to FIG.

2A and 2B are views for explaining a conventional pickup method, wherein FIG. 2A is a plan view of a lead frame, FIG. 2B is a side view of the lead frame in a stacked state, and FIG. () Is a front view of a storage magazine in which a lead frame is stored, and (d) is a sectional side view of a main part showing a storage state in which the lead frame is stored in the storage magazine.

In this specification, the same components, the same materials, and the like are given the same reference numerals throughout the drawings.

The lead frame 1 (see FIG. 3A) before being stored in the storage magazine 21 is generally in a state where several hundreds of the lead frames 1 are closely attached to each other as shown in FIG. It is.

The pickup of the lead frame 1 in such a laminated state is, as shown in FIG.
, Both ends in a direction perpendicular to the longitudinal direction are held by the hand 2 and lifted upward as shown by the arrow U.

Then, the lead frame 1 picked up in this manner is inserted by hand from the front of the storage magazine 21 to the back of the storage magazine 21 as shown by an arrow A, and is stored in the storage magazine 21 (FIG. 3C). And (d) of FIG.

[Problems to be solved by the invention]

The lead frame is generally formed with a thickness of about 0.1 to 0.2 mm.

Therefore, as described above, it is very troublesome to separate the uppermost one of the lead frames in the stacked state from the next lead frame and pick them up one by one one by one by hand, which is very troublesome and requires many man-hours. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a lead frame pickup mechanism that can efficiently and efficiently pick up stacked lead frames one by one.

[Means for solving the problem]

The object is to provide a lead frame pickup mechanism that sequentially picks up the topmost one of the stacked lead frames one by one as shown in FIG. A driving node 12 having one end rotatably connected to one end thereof and rotating about the one end of the stationary node 11 as a center of rotation, and an intermediate node 13 having one end rotatably connected to the other end of the driving node 12. A driven node 14 having one end rotatably connected to the middle of the intermediate node 13 in the axial direction and the other end rotatably connected to the other end of the stationary node 11 and arranged in a row in opposition to and separated from each other. A pair of four-bar linkages 10, fixed to the other end of the middle bar 13 of each four-bar link mechanism 10. Conductive pits that are slightly narrower than the distance between the two ends This is achieved by a lead frame pickup mechanism characterized in that it includes a pickup claw 15.

Further, the above object is also achieved by a lead frame pickup mechanism, wherein a lead frame holding detection mechanism 16 for detecting the presence or absence of electrical conduction between the pickup claws 15 is added to the lead frame pickup mechanism. You.

(Operation)

As shown in FIG. 1, the pick-up mechanism for a lead frame according to the present invention comprises a stationary node 11 fixed so as not to move, and one end rotatably connected to one end of the stationary node 11.
A motor node 12 that rotates about the one end of 11 as a center of rotation, an intermediate node 13 having one end rotatably connected to the other end of the motor node 12,
One end is rotatably connected to the middle of the intermediate node 13 in the axial direction and the other end is rotatably connected to the other end of the stationary node 11. A pair of four-bar linkages 10, fixed to the other end of the middle bar 13 of each four-bar linkage 10, the shortest distance between the tops of the lead frame 1 is opposed to each other when the middle bar 13 moves. And a conductive pick-up claw 15 slightly narrower than the distance between both ends. The driving joint 12 of the left four-joint link mechanism 10 (referred to as the first four-joint link mechanism) is rotated clockwise and right The motor 18 of the other four-link mechanism 10 (referred to as the second four-link mechanism) is rotated counterclockwise, and the pick-up claw 15 fixed to the intermediate link 13 of the first four-link mechanism is rotated counterclockwise and moved. Of the second four-joint link mechanism while rotating so that the locus of The pick-up claw 15 fixed to the node 13 is rotated clockwise and rotated so that the trajectory of the movement becomes substantially D-shaped. nail
A configuration in which the top end of the lead frame 1 in the stacked state is pressed and held at both ends of the top end of the lead frame 1 in the stacked state, and the top end of the lead frame 1 in the stacked state is sequentially picked up one by one by ascending. doing.

Therefore, the pick-up claws 15 that have risen to the predetermined height in this state move in the direction in which they are separated from each other, so that the lead frame 1 is separated from the pick-up claws 15.

Thus, if the lead frame 1 falling from the pick-up claw 15 is received by a receiving mechanism (not shown) synchronized with the movement of the pick-up claw 15, the above-described operation of manually peeling the stacked lead frames 1 one by one manually. Becomes unnecessary.

〔Example〕

Hereinafter, an embodiment of a lead frame pickup mechanism of the present invention will be described with reference to FIG.

FIG. 1 is a side sectional view of a main part of an embodiment of a lead frame pickup mechanism of the present invention.

As shown in FIG. 1, the lead frame pickup mechanism of the present invention comprises a rod-shaped stationary node 11 firmly fixed so as not to move.
A rod-shaped driving node 12 that is rotatably connected to one end of the stationary node 11 with one end rotatably and driven by a rotation control device (not shown) around the one end of the stationary node 11 as a rotation center; A rod-shaped intermediate joint whose one end is rotatably connected to the other end of the driving joint 12
13 and a driven node 14 having one end rotatably connected to the middle of the intermediate node 13 in the axial direction and the other end rotatably connected to the other end of the stationary node 11. Knot link mechanism
10 (first four-bar linkage and second four-bar linkage)
And, a metal plate, for example, a step 15a formed by cutting and forming one surface of one end portion of an iron plate in a direction perpendicular to the longitudinal direction thereof is downward,
The pickup includes a pickup claw 15 whose axis is perpendicular to the axis of the intermediate node 13 and is directed toward the driven node 14 and the other end is fixed to the tip of the intermediate node 13. The step 15a is configured to be smaller than the thickness of the lead frame 1.

In this manner, the two four-bar linkages in which the pick-up claw 15 is fixed to the middle knot 13 are provided with a step 15a of the pick-up claw 15.
Are arranged so as to be separated from each other and opposed to each other.

Next, a procedure in which the four-bar linkage configured as described above sequentially picks up the stacked lead frames 1 one by one will be described.

Activate the rotation control device and move the prime mover 12 of the four-bar linkage of the first four-bar linkage in the direction of arrow A (clockwise);
The prime mover 12 of the second four-bar linkage is rotated in the direction of arrow A '(left rotation).

Then, the pick-up claw 15 fixed to the intermediate node 13 of the first four-node link mechanism rotates in a substantially inverted D-shape in the direction of arrow C as shown by the dotted line B in the trajectory of the movement. The pick-up claw 15 fixed to the intermediate section 13 of the link mechanism
The trajectory of the movement rotates in a substantially D shape in the direction of arrow C 'as shown by the dotted line B'. Note that the left and right pick-up claws 15 are always located at a line target position with respect to the neutral line T on the paper surface.

Therefore, the left and right pick-up claws 15 press and hold the edges of one end of the uppermost sheet of the lead frame 1 stacked at the positions E and E 'with the step 15a, and pick up the lead. Frame 1 with arrow U
It will be lifted in the direction, that is, upward.

Then, when the left and right pickup claws 15 pass through the position F and the position F ', the step 15 of each pickup claw 15
In order to quickly open the distance between a and c, the lead frame 1 is held by a vacuum chuck (not shown) or the like immediately before the pick-up claw 15 passes the positions F and F ', so that the pick-up claw 15 Then, the lead frame 1 is transferred, and the pickup of the uppermost sheet of the stacked lead frames 1 is completed.

The pick-up of the second and subsequent lead frames 1 is performed by raising the elevating table (not shown) on which the stacked lead frames 1 are mounted by the thickness of the lead frames 1, and sequentially repeating the above-described procedure. All the lead frames are picked up.

Further, a lead frame holding / detecting mechanism 16 for detecting the presence or absence of electrical continuity between the respective pick-up claws 15 and controlling the rotation control device is added to the above-described lead frame pick-up mechanism. If the pickup 1 succeeds, that is, if there is electrical conduction between the pickup claws 15 via the lead frame 1, the operation of the rotation control device is continued as it is,
If the pickup 15 fails to pick up the lead frame 1, that is, if there is no electrical conduction between the pick-up claws 15, the operation of the rotation control device is stopped, so that the operation state of the lead frame pickup mechanism can be detected quickly. It is also possible.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to provide a lead frame pickup mechanism capable of efficiently and efficiently picking up stacked lead frames one by one.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part of an embodiment of a lead frame pickup mechanism of the present invention, and FIG. 2 is a view for explaining a conventional pickup method. In the figure, 1 is a lead frame, 10 is a four-link mechanism, 11 is a stationary joint, 12 is a driving joint, 13 is an intermediate joint, 14 is a follower joint, 15 is a pick-up claw, 15a is a step, and 16 is a lead frame holding detection. The mechanism is shown respectively.

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01L 21/50

Claims (2)

(57) [Claims] A lead frame pickup mechanism for sequentially picking up the uppermost one of the stacked lead frames one by one, comprising: a stationary node (11) fixed so as not to move; and a stationary node (1).
One end is rotatably connected to one end of 1), and the stationary node (1
The prime mover (12) that rotates around the one end of 1) above
And an intermediate node (13) having one end rotatably connected to the other end of the driving node (12), and one end rotatably connected to the axial middle of the intermediate node (13) and the other end stationary. A pair of four-joint link mechanisms (10) comprising a driven joint (14) rotatably connected to the other end of the joint (11) and opposed to and spaced apart from each other in a row state; 10) is fixed to the other end of the intermediate node (13), and the opposite ends are opposed to each other and the intermediate node (13) is fixed.
And a conductive pick-up claw (15) in which the shortest distance between the tips during exercise is slightly smaller than the distance between both ends of the lead frame (1). 2. The lead according to claim 1, further comprising a lead frame holding / detecting mechanism (16) for detecting the presence / absence of electrical conduction between said pick-up claws (15). Frame pickup mechanism.