JPS6031727B2 - feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding device used in semiconductor assembly equipment.

A feeding device is used to directly feed a lead frame, or to place a board, etc. on it, or to feed a bomb, but this feeding device requires reliable operation and precision in the amount of feed, and the amount of feed cannot be easily adjusted. required. An object of the present invention is to provide a feeding device suitable for semiconductor assembly equipment that satisfies the above requirements.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 are front views of the feeding device of the present invention, and although the bodies to which these mechanisms are fed and delivered are not shown, their relationship will be discussed below. The lead frame or ribbon is fed from the left and right to the right in FIGS. 1 and 2.

Fig. 1 shows the feed rod 1 at the left feed start position, and Fig. 2 shows the feed rod 1 moved to the right and the stopper 2 attached to the feed rod 1 located at the body (not shown). Contact surface 3
This shows the state in which the feed rod 1 hits the feed point, that is, the feed rod 1 is at the feed eye position. A feed claw 4 is attached to the feed rod 1, which is supported in a bearing fixed to the body so as to be freely rotatable around an axis 'D and freely movable in the axial direction. Before being sent to the right in the figure, the feed rod rotates slightly around its axis and engages with a hole or notch in the lead frame or ribbon, and as the feed rod 1 moves to the right, the lead frame or The ribbon is fed to the right, and the stopper 2 attached to the feed rod 1 hits the contact surface 3, completing the feeding as shown in FIG. Then, the feed rod 1 rotates slightly in a direction in which the feed pawl 4 disengages from the lead frame or ribbon, moves to the left in the figure, and returns to the position shown in FIG. 1. Next, the feeding mechanism of this feeding rod 1 will be described.

A lever 8 that holds a cam follower or roller 7 that engages with the outer periphery of a cam 6 attached to the drive shaft 5 is slidably fitted to a shaft 9 that is rotatably provided on a body (not shown). There is. Piece 1 fixed to shaft 9 with one screw
An adjustment screw 12 provided at the right end of the lever 1 engages with the lever 8 at a protrusion formed on the lever 8. Further, a lever bar 13 is fixed to the shaft 9, and by adjusting an adjusting screw 12, the rotational position of the lever 8 with respect to the lever 13 can be adjusted. At the lower end of the screw 10 is a tension lock 314 whose left end is locked to the body (not shown).
The right end of the shaft 9 is locked, and the first link consisting of the lever 13, the piece 11, and the lever 8 is urged to rotate clockwise about the center point of the shaft 9 (referred to as the first fixed fulcrum). Alternatively, one end of the coiled spring (not shown) is locked to the body (not shown), and the end of the spring is connected to the wisteria 9 or piece 11.
Alternatively, it may be engaged with the lever 13 and biased to rotate the shaft 9 clockwise. The left end of the lever 13 is pivotally connected to the lower end of a second link 15 by a pin 16, and the upper end of the second link 15 is connected by a pin 18 to the left end of a rod 17 having rod end bearings attached to both ends. The right end of the rod 17 is a piece 19 fixed to the feed rod 1
It is pivotally connected to the pin 20'. second link 1
5 is pivotally connected to the left end of a small link 21, which is a third link, by a pin 22, and the right end of the small link 21 is fixed to one end of an adjustment link 24, which will be described later, by a pin 25. During the operation of this feeding device, the adjustment link 24 is locked to the body as described later, so the position of the pin 25 remains unchanged. However, when adjusting the stroke, it can be moved as described later. The center point of is called the movable fulcrum. As is clear from the figure, the first fixed fulcrum (the center point of the shaft 9), the movable fulcrum (the center point of the pin 25), the first link (link! 3, pin l1, lever 8
), second link 15, third link (small link 21)
Together, they constitute a four-section rotational chain mechanism. On the other hand, the adjustment link 24, which has the same arm length (distance between pin 25 and shaft 23) as the link length (distance between pins 22 and 25) of the small link 21, is connected to the second link provided on the body. It is swingably supported on a shaft 23 which is a fixed fulcrum, and one end of the adjustment link 24 is pivoted to the small link 21 as a movable fulcrum by a pin 25 as described above, and the other end is attached to a circular arc elongated hole 26 provided in the body. It can be locked with a fixing screw 27.

The operation of the apparatus of this embodiment having the above structure will be explained with reference to FIGS. 1 to 7.

4 and 5 show the feed start position and feed limit when the swing position of the adjustment link 24 is adjusted and fixed to the body so that the stroke of the feed rod 1 becomes the standard stroke S. FIG. 4 is an explanatory diagram showing the positions, and FIG. 4 corresponds to FIG. 1, and FIG. 5 corresponds to FIG. 2. 6th
7 and 7 are explanations showing the feed start position and feed limit position when the swing position of the adjustment link 24 is adjusted and fixed to the body so that the stroke of the feed rod 1 becomes a larger stroke S2. It is a diagram. First, we will explain how to obtain the standard stroke S.

As shown in FIG. 5, with the cam 6 at the minimum lift position, adjust the adjustment link 24 so that the tip of the adjustment link 24 is oriented at the center (0 point) of the circular arc elongated hole 26.
4 is tightened and fixed to the body, and the center point of the pin 22 of the second link 15 in the four-bar rotation chain mechanism and the center point of the shaft 23 (second fixed fulcrum) are overlapped. The position of the feed claw 4 is adjusted so that the tip of the feed claw 4 is at the desired feed limit position P, and the feed claw 4 is fixed to the feed rod 1. At the same time, a stopper 2 whose position can be adjusted in the longitudinal direction of the feed rod 1 is attached to the body. It is fixed to the feed rod 1 in a state where it is supported by the contact surface 3. Thereby, the feed limit position of the feed rod 1 is determined. At this time, as shown in FIG. 2, the adjustment screw 12 is used to provide a desired gap a between the cam 6 and the roller 7, which is the force follower (actually, the lever 8 is under its own weight). rotates clockwise and contacts the cam, and then tightens the adjustment screw 12.
There is a gap between the tip of the bar 8 and the protrusion of the bar 8). After determining the feed limit position as described above, when the cam 6 is rotated 180 degrees counterclockwise, the cam lift becomes larger, and the feed comb 1 moves to the left due to the action of the four-bar rotation chain mechanism, as shown in Fig. 4. , the feed rod 1 reaches the feed start position at the maximum cam lift position.

Then, the cam 6 is rotated counterclockwise as shown by the arrow in the figure.

The cam curve is an arc centered on the shaft 5 slightly to the left and right of the maximum lift portion of the cam curve that contacts the roller 7 in FIG. 1, and the roller 7 remains stationary for a while. In the meantime, the swinging mechanism (not shown) of the feed claw 4 is activated by the rotation of the feed rod 1 which is interlocked with another cam fixed to the shaft 5, and the feed rod 1 is rotated counterclockwise in FIG. The feed claw 4 engages with the lead frame or ribbon. When the cam 6 is further rotated counterclockwise, the maximum lift part of the curve is 1
The cam lift is gradually reduced until it approaches the opposite side of 80 degrees, and the roller 7 rotates clockwise together with the lever 8 about the shaft 9, and the piece 11 is screwed together with the shaft 9 via the adjusting screw 12. It is rotated clockwise through the lever 8 by the elasticity of the tension spring 14 while maintaining the position relative to the lever 8.

When the shaft 9 rotates clockwise, the lever 13 also rotates clockwise, and due to the action of the four-bar rotation chain mechanism, the small link 21 that is the third link also rotates clockwise, and the second link 15 also rotates clockwise. The other end of the second link 15 pushes the piece 19 to the right in the figure via the pin 18, rod 17, and pin 20, causing the feed rod 1 to move to the right. Shortly before the cam 6 rotates 1800 times from the position shown in FIG. 4 or 1, the stopper 2 is rotated as shown in FIG. 5 or 2.
comes into contact with the contact surface 3 of the body, and the feed rod 1 stops at the feed limit. As mentioned above, there is a small gap a between the minimum lift part of the cam and the roller 7, so when the stopper 2 touches the contact surface 3, an unreasonable force is applied between the cam and the roller. There isn't. There is a gap between the cam 6 and the roller 7 on the left and right sides of the minimum lift part (actually the gap at the tip of the adjustment screw 12), so despite the rotation of the cam, there is a gap between the cam 6 and the roller 7. In this case, roller 7 is stationary.

In the meantime, the swinging mechanism of the feed pawl 4 (not shown) rotates the feed pawl 1 clockwise around its center in FIG. 3, and the feed pawl 4 is disengaged from the lead frame or ribbon. Subsequently, when the cam 6 further rotates counterclockwise, the roller 7 is pushed up by the cam 6, and the lever 8 rotates counterclockwise around the shaft 9 and comes into contact with the adjustment screw 12. is pressed to rotate the piece 11 counterclockwise through the screw 10 against the tension spring 14, and at the same time, the lever 13 is rotated counterclockwise together with the shaft 9.

The movement of the lever 13 is connected to the second link 15 via the pin 16.
This is transmitted to the small link 21 which is the third link, and due to the action of the four-bar rotation chain mechanism, the second link 15 swings counterclockwise, whereby the pin 18, rod 17, and pin 20
and via piece 19. Tsudo moves to the left. When the cam 6 rotates once and returns to its original position, the feed rod 1 also comes to the feed start position, as shown in FIGS. 1 and 4. Above, the case where the standard stroke S is given to the feed rod 1 has been explained, but when giving the longer stroke S2, the 6th stroke is mainly explained.
This will be explained using FIG. 7 and FIG. In this case, as already explained with reference to FIG. 5, since the feed limit position of the feed lever 1 is determined, the stopper 2 is moved to the contact surface 3 by cam drive as shown in FIG. If you let it go, feed claw 4
The position is the same P position as in Fig. 5, and the axis 2
3 (second fixed fulcrum) and the center point of the pin 22 coincide with each other, resulting in the same state as in FIG. 5. Then, loosen the fixing screw 27 and rotate it around the shaft 23 (second fixed fulcrum) so that the tip of the adjustment link 24 points to the L position in Fig. 7. Then, fix the fixing screw 27 vertically to the body. do. When rotating the adjustment link 24, the shaft 23 and pin 2
Since the center positions of the two overlap, the third link, the small link 21, also rotates together with the adjustment link 24.
The positions of the other links of the four-bar rotation chain mechanism, that is, the second link lever 13 and the second link 15, are the same as in FIG. 5. However, only the position of the movable fulcrum (point D in the pin 25), which is one element of the four-bar rotation chain mechanism, has changed. That is, the setting of the feed limit position of the feed rod 1 only needs to be done once, for example, in the state shown in FIG. Since the position of the pin 25 (movable fulcrum) has changed as shown in Fig. 7, when the cam 6 is rotated 1800 times counterclockwise and the roller 7 is raised at the maximum cam lift part, as shown in Fig. 6. As shown, due to the action of the four-bar rotation chain mechanism, the feed bar 1 moves to the left to reach the feed start position, but at this time the stopper 2 is positioned to the left in the figure compared to the case in Figure 4. becomes.

In other words, in Figure 4, S. However, in FIG. 6, it becomes S2. Therefore, when the cam 6 is rotated counterclockwise, the feed rod 1 moves to the right in the diagram from the feed start position in FIG. 6 to the feed limit position in FIG. 7 due to the action of the four-bar rotation chain mechanism. (Stroke is S2).

In addition, in the stroke adjustment in FIG. 5 or FIG. 7, the adjustment link 24 is rotated clockwise as shown in FIG.
It is clear that when fixed, the stroke can be set long as described above, and when rotated counterclockwise in the opposite direction to that shown in FIG. 7, the fixed stroke can be set short. As explained above, according to the present invention, the cam follower is attached to one end and the first fixed fulcrum (shaft 9
The first part was able to see-saw around the center of the
a second link 15 whose one end is pivotally connected to the other end of the first link and whose end is connected to the feed rod; one end is pivotally connected to the intermediate part of the second link and the other end is Movable fulcrum 2
A cam 6 fixed to the drive shaft 5 is disposed so as to be engageable with the cam follower 7, and a cam 6 fixed to the drive shaft 5 is arranged so as to be engageable with the cam follower 7. The operation of the four-bar rotation chain mechanism based on rotation causes the feed rod to reciprocate via the second link 15, and the feed rod has a contact surface provided on the body at its feed limit position. A stopper 2 that abuts on the body 3 is installed so that its fixed position can be adjusted, and that the stopper 2 is attached to the body that overlaps with the pin contact point of the second link and the third link when the feed rod is set at approximately the feed end position. An adjustment lever is provided that is swingable about a second fixed fulcrum provided, one end of the adjustment link is pivotally connected to the third link at the movable fulcrum, and the other end of the adjustment link is pivoted to the third link at the movable fulcrum. The feed limit position of the feed rod is determined by the adjusted stopper 2, while the feed start position of the feed rod is determined by fixing the adjustment link 24 to a second fixed fulcrum of the front arm. Since the position of the movable fulcrum 25 is determined by swinging the movable fulcrum 25 at a desired angle around the feed rod 1 and fixing the other end of the link to the base, the feed limit position is determined by the stopper 2 that is defeated by the feed rod 1. is the contact surface 3 of the body
The feed limit position of the feed rod 1 is determined by hitting the
Therefore, the feed limit position of the feed pawl 4 attached to the feed rod 1 is extremely accurately fixed, and an overrun prevention device (such as an overrun prevention device) using a spring or the like to prevent overrun when the lead frame or ribbon moves forward and stops. (not shown), the feeding precision of the lead frame or ribbon becomes extremely high, and once the position adjustment of the feed pawl 4 with respect to the feed rod 1 is performed, it becomes unnecessary from now on; To adjust the feed amount or stroke of the rod 1, it is sufficient to simply turn the adjustment link 24 by a desired angle around the second fixed fulcrum and fix one end, so the adjustment work is extremely simple.

Therefore, it is extremely easy to change the feed amount to accommodate lead frames or ribbons with different feed pitches, and the feed accuracy is also high, making it highly effective as a feed device for semiconductor manufacturing equipment.

[Brief explanation of drawings]

The drawings all show examples; FIG. 1 and FIG. 2 are front views, FIG. 3 is a view taken in the direction of arrow A in FIG. 1, and FIGS. The skeleton diagrams, FIGS. 6 and 7, showing the feed start position and the feed eye position, respectively,
FIG. 7 is a schematic diagram showing a feed start position and a feed limit position when obtaining a larger stroke S2. 1...Feeding rod, 2...Stopper, 3...Abutment surface, 4...
...Feed claw, 5...shaft, 6...cam, 7...low-fu, 8
... Lever, 9 ... Shaft, 10 ... Screw, 11 ... Piece, 12 ... Adjustment screw, 13 ... Lever, 1
4...Tension spring, 15...Second link, 16...Pin, 17...Rod, 18...Pin, 19...Piece, 2
0...Pin, 21...Small link that is the third link, 22
...Pin, 23...Axis, 24...Adjustment link, 25...Pin, 26...Elongated arc hole, 27...
・Fixing screw. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. A first link with a cam follower attached to one end and capable of seesaw movement around a first fixed fulcrum;
a second link whose one end is pivotally connected to the other end of the first link and whose other end is connected to the feed rod; A cam fixed to the drive shaft is disposed so as to be engageable with the cam follower, and a cam fixed to the drive shaft is arranged so as to be engageable with the cam follower. The feed rod is caused to reciprocate through the second link by the operation of the four-bar rotation chain mechanism, and a stopper is fixed to the feed rod, which abuts against a contact surface provided on the body at the feed limit position. mounted so as to be adjustable in position, and further centered around a second fixed fulcrum provided on the body that overlaps the pivot point of the second link and the third link when the feed rod is approximately at the maximum feed position. A movable adjustment link is provided, one end of the adjustment link is pivotally connected to the third link at the movable fulcrum, and a means is provided for fixing or unfixing the other end of the adjustment link to the base; The feed limit position of the rod is determined by a stopper whose position is adjusted, while the feed start position of the feed rod is determined by swinging the adjusting link at a desired angle about the second fixed fulcrum and by turning the other end of the link. A feeding device characterized in that the position of the movable fulcrum is determined by being fixed to a base.