JPS6324884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sample supplying and discharging device, and particularly to a supplying and discharging device for lead frames in wire bonders, die mounters, and the like.

Wire bonders are equipped with a rotary table because it is necessary to match the tension direction of the wire with the vibration direction of the wedge at the bonding station, but in conventional lead frame supply/unloading devices, the lead frame transfer mechanism and its drive source are installed on the rotary table. As a result, the mass of the rotating part increases, and therefore the inertia increases, making high-speed rotation operation difficult, resulting in an increase in working time. In addition, conventionally, when trying to supply and carry out multiple lead frames in sequence, the lead frame had to be stopped and waited until the bonding work of the preceding lead frame was completely completed so as not to interfere with the rotational movement of the rotary table. The transport distance for feeding the lead frame to the rotary table becomes longer than necessary, and this also causes an increase in working time.

The present invention eliminates these drawbacks and eliminates the need to place a lead frame transfer mechanism on the rotary table.
Another object of the present invention is to provide a sample supply/unloading device that allows lead frames that require rotational movement to be continuously fed in a bonding station so that the distance between them is minimized, thereby significantly reducing work time. shall be.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 1 is a front view of a lead frame supply/unloading device in a wire bonding apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a detailed front cross-sectional view of a rotary table. FIG. 4 is a partial cross-sectional view of the lead frame positioning mechanism provided on the rotary table.

In FIG. 1, reference numeral 10 is a loader 2 for storing a large number of lead frames 1 and feeding them out one after another.
0 is a supply side feeder for transferring the lead frame 1 sent out from the loader 10 by pitch feeding and feeding it to the bonding station indicated by arrow A, and 40 is a lead rotated in a horizontal plane around bonding station A to be supplied. A rotary table positions the frame 1 to enable the bonding work, 20' is an unloading feeder for unloading the lead frame 1 from the rotary table 40 by pitch feeding after the work has been completed, and 10' is the unloading feeder 20'. This is an unloader that sequentially stores lead frames 1 that have been loaded.
The discharge side feeder 20' and the unloader 10' are adjacent to each other on the base plate 2 in a straight line.

Next, each detailed mechanism will be explained. As shown in FIGS. 1 and 2, the loader 10 has two guide bars 11 fixedly installed almost upright on a base plate 2.
A storage box 12 that can slide along the guide bar 11; a feed screw 13 that is arranged parallel to the guide bar 11 and rotated by a motor (not shown); and a feed screw 13 that is screwed onto the feed screw 13 and fixed to the storage box 12. A stacked magazine 17 in which lead frames 1 are stacked and stored in the storage box 12 is provided with a feed nut 14 and a leaf spring 16 fixed to the upper part of a support arm 15 fixed to the front wall of the storage box 12. Mounted on a shelf and leaf spring 16
Fix the stacking magazine 17 by tightening the feed screw 1.
It can be raised and lowered by rotating 3. A motor (not shown) rotates in response to a loader start command signal output from a controller (not shown), and is fixed to the tip of a swinging lever 18 supported by the feeder 20 on the supply side, and moves the lead frame 1 to the feeder 20 on the supply side. The lead frame is stopped by a signal from a switch (not shown) actuated via the swing lever 18 due to the upward movement of the lead frame rise detection plate 19 set at the feed-out position.

The feeder 20 on the supply side has a loader 1 on the base plate 2.
The lead frame 1 has a support frame 21 adjacent to the support frame 21, and a supply guide path 22 for the lead frame 1 is formed on the upper surface thereof along the feeding direction of the lead frame 1.
A cam shaft 23 is parallel to the supply guide path 22 and rotatably attached to the support frame 21 below the supply guide path 22.
is supported. A bell cam 24 and a plate cam 25 are fixed adjacent to each other on this camshaft 23, and a timing pulley 26 is attached to the end on the rotary table 40 side.
is fixed. Further, above the camshaft 23 and directly below the supply guide path 22, a guide rail 27 is supported by a lifting platform 28 parallel to the supply guide path 22, and a reciprocating platform 29 is slidable along this guide rail 27. It is provided. The lifting table 28 is supported by a guide bar 31 slidably fitted to a bush 30 fixed to the support frame 21, and is raised and lowered by the rotation of the plate cam 25 via a lever 32. The reciprocating table 29 is reciprocated by the rotation of the bell cam 24 via the lever 33. Feed claws 36 are provided on the upper surface of the carriage 29 at the tips of arms 34 and 35 that extend along the supply guide path 22 toward the loader 10 and toward the rotary table 40, respectively. Note that the distance from the side wall 22a of the supply guide path 22 to the bonding station A is greater than the length of the lead frame 1.

As shown in FIG. 3, the rotary table 40 includes a gearbox 41 supported by the base plate 2 so as to protrude downward from the base plate 2, a rotary shaft 42 rotatably supported almost perpendicularly to the gearbox 41, and a rotary shaft 42.
a worm wheel (not shown) provided in the
A worm shaft 43 arranged parallel to an axis perpendicular to the rotating shaft 42 and rotatably supported by the gear box 41; a worm gear 44 fixed to the worm shaft 43 and meshing with the worm wheel; a stepping motor 46 directly connected to the rotating shaft 42, a rotating table 47 fixed to the upper end of the rotating shaft 42 and protruding from the upper part of the base plate 2 as shown in FIGS. 1, 2, and 4; A transfer guide path 48 for the lead frame 1 fixed to and formed on the upper surface, and a holding plate 49 for the lead frame 1 provided along the transfer guide path 48.
The support frame 50 has a support frame 50 and a support frame 50 arranged substantially parallel to the extension direction of the transfer guide path 48 on the lower back side of the transfer guide path 48. A camshaft 52 is supported, a plate cam 53 is fixed to the center of the camshaft 52, and a plate cam 53 is fixed to one end of the camshaft 52 on the supply side feeder 20 side and corresponds to the timing pulley 26 and is connected to the timing belt 54. Therefore, a timing pulley 55 that interlocks with each other, a timing pulley 56 fixed to the other end of the camshaft 52, a ball bush 57 fixed to the center of the support frame 50 along a substantially vertical direction, and this ball bush 57. A sliding rod 5 that is fitted in and slides in the vertical direction
8 and a transfer guide path 4 fixed to the upper end of the sliding rod 58.
A pressing plate 59 protrudes upward from the window 48a opening at 8 and pushes up the lead frame 1 and presses it against the holding plate 49; a coil spring 60 constantly biases the sliding rod 58 upward; and a cam lever 61 that swings and pushes down the sliding rod 58 as the plate cam 53 rotates.

Also, the unloading side feeder 20' is the supplying side feeder 2
Since the configuration is exactly the same as that of the supply feeder 20, a description thereof will be omitted here, but for the purpose of explaining the operation below, parts similar to those of the supply side feeder 20 will be distinguished by adding '' to the same number. A timing pulley 37' is fixed to one end of the camshaft 23' of the feeder 20' on the rotary table 40 side, and interlocks with the timing pulley 56 by a timing belt 38'. Further, a timing pulley 39' is fixed to the other end of the camshaft 23' and is rotated via a timing belt by a camshaft drive motor (not shown).
Further, since the unloader 10' is constructed in exactly the same manner as the loader 10, the explanation will be omitted here, and parts similar to those of the loader 10 will be distinguished by adding '' to the same numbers.

Next, the operation of this device having such a configuration will be explained. When a loader start command signal is given to a motor (not shown) of the loader 10, the feed screw 13 is rotated by the motor, the storage box 12 is raised, and the magazines 17 are stacked and stored in the stacked magazines 17 mounted on the storage box 12. One of the uppermost parts of the lead frame 1 comes into contact with the rise detection plate 19 and raises the rise detection plate 19. This causes the swing lever 18 to swing, actuating a switch (not shown), and stopping the motor (not shown).
is located at the delivery position, that is, on the extension of the supply guide path 22. Thereafter, a camshaft drive motor (not shown) is activated, and the timing pulley 39' rotates in conjunction with the timing pulley 39', thereby rotating the camshaft 23'. The rotation of the camshaft 23' passes through a timing pulley 37', a timing belt 38', and a timing pulley 56.
2, and is further transmitted to the camshaft 23 via the timing pulley 55, timing belt 54, and timing pulley 26. Here, the camshaft 23,
The transmission speed ratio is selected so that all the shafts 52 and 23' rotate at the same speed.

Now, when the camshaft 23 rotates, the plate cam 25 rotates, and the elevator platform 28 descends. Due to this operation, the carriage 29 is also lowered, and the feed pawl 36 is also lowered and engaged with the lead frame 1 positioned at the feed position. When the camshaft 23 continues to rotate further, the carriage 29 slides to the right due to the rotation of the bell cam 24, and the feed pawl 36 also slides to stack the lead frames 1 from the magazine 17 and guide them to the supply guide path 22. Transfer. At this time,
If the amount of movement of the feed pawl 36 determined by the lifting height of the bell cam 24 is P, then P is equal to the pitch distance of the bonding work point of the lead frame 1. As the camshaft 23 continues to rotate, the feed pawl 36 is raised again by the plate cam 25, disengaging from the lead frame 1, and returned to its original position by the bell cam 24, completing one pitch feed operation. do.

As the camshaft 23 continues to rotate, the lead frame 1 is transferred along the supply guide path 22 by a pitch distance of P, and is eventually transferred from the supply guide path 22 to the transfer guide path 48 of the rotary table 40 and continues to advance. . Then, when the leading point to be bonded on the lead frame 1 reaches the bonding station A, the first bonding operation is performed here. At this time, the camshaft 52, which is rotating at the same speed as the camshaft 23, moves the plate cam 52 to the plate cam 52, which is rotating at the same speed as the camshaft 23.
3 to release the downward push of the slide bar 58, raise the slide bar 58, and project the press plate 59 upward, press the lead frame 1 against the press plate 49, and correct the lead frame 1 for bonding work. Position to work point.

During the bonding work, in order to match the tension direction of the wire with the vibration direction of the wedge, the stepping motor 46 is rotated by a predetermined number of steps to rotate the turntable 47, and the lead frame 1 is rotated together with the transfer guide path 48 to perform the work. Let's do it. At this time, the cam lever 61 is in a state where the sliding rod 58 is released from being pushed down, and there is no need for it to come into contact with the plate cam 53, so that no contradiction occurs. In addition, there is a fear of interference between the front and rear supply guide paths 22 and the unloading guide path 22' due to the rotation of the entire lead frame 1. This can be completely prevented as shown in FIGS. 5 and 6 because of the restriction that it cannot be provided closer to the bonding station A than the position having a distance greater than its length.

When the bonding operation is completed for one bonding point in this way, the next bonding point is positioned on the bonding station A by pitch feed, and the bonding operation is repeated in the same manner. When the bonding work for one lead frame 1 is completed, the lead frame 1 is transferred to the feeder 20' on the ejection side by pitch feeding operation by the combined operation of the plate cam 25' of the feed claw 36' of the feeder 20' on the ejection side and the bell cam 24'. It is pulled out from the rotary table 40 and transferred along the unloading guide path 22', and is stored in the stacking magazine 17' of the unloader 10'.

Now, in this way one lead frame 1
After the supply, bonding, and unloading operations for the lead frame 1 have been completed, the subsequent state of the lead frame 1 will be described. Now, if the maximum rotation radius around the bonding center A on the transfer guide path 48 is R, and the distance from the top bonding point of the lead frame 1 to the tip in the feeding direction is a, then the seventh
As shown in the figure, when bonding work is performed on the last bonding point of the preceding lead frame 1, the following lead frame 1 is attached to the preceding lead frame 1 so as not to interfere with the rotation of the rotary table 40. Assuming that the rotary table 40 rotates within 45 degrees left and right, the position to be taken is L, which is the distance between the last bonding point of the preceding lead frame 1 and the first bonding point of the following lead frame 1. If the position is L
must be an integer multiple of the feed pitch P, so L=P×n (n=1, 2...n), and as a condition for not interfering with the rotation of the rotary table 40, L>R+a. Must be. From these, two successive lead frames 1 have a distance of a pitch represented by the minimum n that satisfies the inequality n>R+a/P between the last bonded point on the preceding side and the first bonded point on the succeeding side. It would be a good idea to keep it.

In order to satisfy this condition, the camshaft drive motor is stopped every n pitch feeding operations from the time when the loader 10 completes sending out the leading lead frame 1, the pitch feeding operation is interrupted, and the loader start command signal is is output to start the motor of the loader 10 (not shown), position the following lead frame 1 at its delivery position, and then start the camshaft drive motor again to restart the pitch feeding operation.

The lead frame supplying and unloading device having the structure and operation described above has the advantage that only the frame can be rotated freely even in a die mounter that requires the die to be mounted at a certain degree of inclination, without changing its main purpose. It can be applied from

As is clear from the above description, the sample supply and carry-out device according to the present invention has the following advantages. It is possible to continuously feed samples that require rotational movement at the work station, improving work efficiency. The mechanism is simple because supply and unloading are performed by pitch feeding operations of the same type of mechanism using the same drive source. Since the rotary table does not require a transfer mechanism, the mass of the rotary table is reduced, high-speed response is improved, and work efficiency is improved. If rotational operation is not required at the work station, a more efficient continuous feeding operation with one empty pitch can be performed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a lead frame supplying and unloading device in a wire bonding apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a detailed front sectional view of a rotary table, and FIG. The figure is a partial cross-sectional view of the lead frame positioning mechanism provided on the rotary table, and FIGS. 5, 6, and 7 are explanatory views of the lead frame pitch feeding operation. 1...Lead frame, 10...Loader, 1
0'... Unloader, 17, 17'... Stacking magazine, 20... Supply side feeder, 20'... Export side feeder, 22... Supply guide path, 22'... Export guide path, 36, 36'... ...Feeding claw, 40... Rotating table, 47... Rotating table, 48... Transfer guide path, 49... Pressing plate, 59... Pressing plate.

Claims (1)

[Claims] 1. It is possible to hold a magazine containing samples having a plurality of work points to be bonded at equal pitches, raise and lower the magazine, and sequentially position the samples in the magazine at the delivery position based on a command signal. A loader, a pitch feed mechanism disposed adjacent to the loader, having a sample supply guide path, and a feed claw for engaging the sample, are provided, and the sample positioned at the feed position by the loader is pulled out and guided by the sample. It has a supply feeder that transfers the work points to be bonded pitch by pitch along the path, and a positioning mechanism that is disposed adjacent to the supply feeder and positions the sample supplied from the supply feeder in the work station. A rotary table that allows the sample to be rotated in a horizontal plane as required;
a carry-out side feeder disposed adjacent to the rotary table, having a sample carry-out guide path, provided with a pitch feed mechanism for engaging the sample, and drawing the sample from the rotary table and transporting it along the carry-out guide path; It is possible to hold and lower a stacking magazine arranged adjacent to the feeder on the carry-out side and capable of storing samples, and to sequentially position the magazine at the storage position of the samples based on the command signal, and to transport the magazine by the feeder on the carry-out side. 1. A sample supply and carry-out device comprising: an unloader for storing a sample. 2 The command signal is n
2. The sample supply and carry-out device according to claim 1, wherein the sample supply and carry-out device is output every time a number of pitch feed operations is performed as represented by the minimum integer n, which is R+a/P. 3. The sample supply and carry-out device according to claim 1, wherein the pitch feed mechanism of the feeder on the supply side and the pitch feed mechanism of the feeder on the carry-out side are configured to interlock via an interlocking mechanism.