JPH0462973B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a strip-shaped work chuck device that grips and takes out a large number of stacked strip-shaped works, such as lead frames for semiconductor devices, one by one from the top layer. It is related to.

BACKGROUND TECHNOLOGY Conventionally, as shown in FIG.
As shown in FIG. 5, when a large number of lead frames 1 are stacked and taken out from the top layer one by one from this stacked state, two places equidistantly apart from the center position of the lead frame 1 in the longitudinal direction are removed. This is generally done by holding both widthwise sides between a pair of opening/closing claws.

Problems to be Solved by the Invention By the way, in the conventional chuck device, when chucking, the claws that clamp the lead frame 1 open and close in a fixed position, so if the lead frame 1 is bent due to warping or the like, There was a problem in that it was difficult to hold the lead frame 1 with the claws, and as a result, the lead frame 1 could not be taken out smoothly.

Therefore, a device has been proposed that clamps the lead frame 1 while correcting the warpage, but such a device cannot correct two types of warp, concave and convex, with a single device. On the other hand, it had the disadvantage of having a complicated structure and increasing its size.

Means for Solving the Problems The present invention comprises a movable frame movable in the vertical direction, a center block attached to the lower end of a center block support shaft supported in the center of the movable frame so as to be movable in the vertical direction. , sides disposed on both sides of the center block, one end facing the center block is swingably pivoted to the center block, and the other end is supported movably in the vertical direction on both sides of the movable frame. A side block connected to the block support shaft is bridged between the upper end of the center block support shaft and the upper end of the side block support shaft, and the intermediate part is pivotally connected to the movable frame. It is composed of a block connecting lever and a chuck unit in which a pair of claws are attached to the side block so as to be openable and closable, and the pair of claws grips a strip-shaped workpiece from both sides in the width direction.

Function This invention provides a degree of freedom to the side blocks relative to the center block as described above, and is equipped with a chuck unit that clamps the strip-shaped work to the side blocks, so that the side blocks can be prevented from warping due to unevenness of the strip-shaped work. The distance between the strip-shaped workpiece and the chuck unit is kept constant at all times during chuck.

Embodiment FIGS. 1 to 3 show an embodiment of the belt-shaped workpiece chuck device of the present invention. A large number of lead frames 1, each of which has the main portion including the semiconductor element molded with resin, are stacked at a predetermined position. ing.
In FIGS. 1 to 3, reference numeral 11 indicates two parallel guide rods 12, 12 and ball bushes 13, 13.
The movable frame is supported so as to be vertically movable through the frame, and is moved up and down by the expansion and contraction of a vertically moving cylinder (not shown) attached to the fixed frame. 14 is movable frame 1
A center block support shaft is vertically movably inserted into and supported by a guide cylinder 15 integrally formed in the center of the block 1 via a ball bush 16, and a center block 18 is fixed to the lower end via a bolt 17. This center block 18 is provided with roller shafts 19, 19 passing through it on both sides, and rollers 20, 20 are rotatably provided at both ends thereof, respectively. 21,
Reference numeral 21 denotes side blocks placed on both sides of the center block 18, with long windows 22 provided at the base of the side blocks.
22 to the rollers 20, 20 of the center block 18.
The roller shafts 19, 19 of the rollers 20, 20 of the center block 18 are pivoted around the roller shafts 19, 19 of the rollers 20, 20 of the center block 18, respectively. Reference numerals 23 and 23 denote side block support shafts that are inserted and supported through ball bushes 24 and 24 at both ends of the movable frame 11 so as to be able to move up and down. The tips of the side blocks 21, 21 are pivotally attached to the side blocks 21, 21 via pins 26, 26. Reference numeral 27 denotes a roller mounting member fixed to the upper end of the center block support shaft 14 via a bolt 28, with roller shafts 29, 29 protruding from both sides, and two rollers 30, 30 each mounted at the tip end thereof, so as to be freely rotatable. It is set up. 31, 31
is a roller mounting member fixed to the upper ends of the side block support shafts 23, 23 via bolts 32, 32, with the roller shafts 33, 33 protruding from both sides, and rollers 34, 34 rotatably mounted at both ends thereof. It is set up. Reference numerals 35 and 35 denote approximately L-shaped lever support members fixed to symmetrical positions on both sides of the upper surface of the movable frame 11 via bolts 36, 36, and the intermediate portions of the block connecting levers 37 and 37 are connected to the lever fulcrum shafts at their tips, respectively. It is pivotally supported via 38,38. The block connecting levers 37, 37 have one end 37a,
37a is brought into contact with the rollers 30, 30 attached to the roller attachment member 27 fixed to the upper end of the center block support shaft 14, and the other ends 37b, 37b are fixed to the upper ends of the side block support shafts 23, 23. The center block support shaft 14 and the side block support shafts 23, 23 are bridged by contact with rollers 34, 34 attached to the members 31, 31. 39, 39 is the movable frame 11
A spring locking pin 40, which protrudes from the center block 18, is a spring locking bolt screwed onto both sides of the center of the block.
Coil springs 41, 41 are stretched between the center block 18 and the rollers 30, 30 through the center block support shaft 14, the roller mounting member 27, and the roller shafts 29, 29, respectively.
The block connecting lever 37, one end 37a of 37,
37a in elastic contact at all times. 42,4
Reference numeral 2 denotes spring retaining bolts screwed onto both ends of the movable frame 11, and coil springs 43, 43 are tensioned between the pins 26, 26 of the side blocks 21, 21, respectively, and the side blocks 18 are held upward. The other ends 37b, 37 of the block connecting levers 37, 37 are biased to connect the rollers 34, 34 via the connectors 25, 25, the side block support shafts 23, 23, the roller mounting members 31, 31, and the roller shafts 33, 33.
b is always elastically abutted. Incidentally, the spring force of the coil spring 41 and the coil springs 43, 43 is set so as to be balanced with the weight of each member. Reference numerals 44 and 44 refer to spring locking pins that extend and project from the roller mounting member 27 in a direction perpendicular to the roller shafts 29 and 29, and are attached to the guide tube 1 of the movable frame 11.
Spring retaining bolts 45, 45 screwed onto the outer peripheral wall of 6
Coil springs 46, 46 are stretched between the movable frame 11 and the movable frame 11, respectively, to constantly bias the movable frame 11 upward. 4
Reference numerals 7 and 47 designate a chuck unit consisting of a pair of clamping claws 48 and 48 provided on the side blocks 21 and 21, and the intermediate portions of the pair of clamping claws 48 and 48 are connected to the side blocks 21 and 21 via claw fulcrum shafts 49 and 49. At the same time, one end 48a, 48a of the pair of clamping claws 48, 48 is attached to the side block 21, 21.
Cylinder pistons 52, 52 housed in cylinder tubes 51, 51 of chuck opening cylinders 50, 50 provided in the side blocks 21, 2
The chuck opening pushers 55, 55 are housed in housing holes 53, 53 formed in 1, and are constantly biased upward by coil springs 54, 54 compressed between the side blocks 21, 21. It's being held in place.

Next, the operation according to the above embodiment will be explained. A large number of lead frames 1 are stacked at a predetermined position, and when the top lead frame 1 is taken out, all the remaining lead frames 1 are simultaneously lifted upward to a predetermined height by an appropriate lifting mechanism. The next top lead frame 1 is positioned at the chuck level.

First, air is supplied into the cylinder tubes 51, 51 of the chuck opening cylinders 50, 50, and the cylinder pistons 52, 52 in the cylinder tubes 51, 51 and the pushers 55, 55 in the housing holes 53, 53 are moved by the coil springs 54, 55. When pushed down against the spring force of 54, the cylinder pistons 52, 52
Since the ends 48a, 48a of the pair of clamping claws 48, 48 sandwiched between the and pushers 55, 55 move downward, the pair of clamping claws 48, 48 rotate about the claw fulcrum shafts 49, 49. and expand. When the pair of clamping claws 48, 48 are expanded, the movable frame 11 is lowered by a fixed stroke by the cylinder for vertical movement, and the lowering of the movable frame 11 causes the center block 18 and both side blocks 21, 21 to be moved downward.
will fall by the same amount. At this time, if the lead frame 1 is not warped, the center block 18
and both side blocks 21, 21 remain connected in a straight line as shown in FIG.
It is pressed onto the resin mold part with sufficient pressing force. Furthermore, if the lead frame 1 has a concave warp, only the side blocks 21, 21 are pressed onto the resin molded parts on both sides of the lead frame 1 during the descent just before reaching the chuck level; When continuing to descend to the chuck level, both side blocks 21 and 2
1 is pressed against both sides of the lead frame 1 with sufficient pressing force, and at the same time, the lead frame 1
With the warping force, the rollers 20, 20 are swung upward with the roller shafts 19, 19 of the rollers 20, 20 as fulcrums, respectively, and the side block support shafts 23, 23 are raised via the connectors 25, 25, As a result, the roller mounting members 31, 31, the roller shaft 3
3, 33 and rollers 34, 34, the block connecting levers 37, 37 are connected to the lever fulcrum shafts 38, 38.
The rollers 30, 30 and the roller shaft 2 swing around the fulcrum.
9, 29 and the roller mounting member 27, the center block support shaft 14 is lowered, and the center block 1 is lowered by lowering the center block support shaft 14.
8 onto the resin molded portion at the center of the lead frame 1 with sufficient pressing force. Therefore, the center block 18 and both side blocks 21,
21 is deformed to follow the concave warp of the lead frame 1 and securely holds the lead frame 1. Furthermore, if the lead frame 1 has a convex warp, only the center block 18 will be pressed onto the resin molded part at the center of the lead frame 1 during its descent just before reaching the chuck level, but then it will descend to the chuck level. When this continues, the center block 18 is pressed onto the resin molded part at the center of the lead frame 1 with a sufficient pressing force, and at the same time, the center block support shaft 14 is raised by the reaction force of the lead frame 1, and thereby, Roller mounting member 27, roller shaft 29, 2
9 and the rollers 30, 30, the block connecting levers 37, 37 are swung about the lever fulcrum shafts 38, 38, and the rollers 34, 34, the roller shafts 33, 3
3 and the roller mounting members 31, 31, and by lowering the side block support shafts 23, 23, both side blocks 21, 21 are lowered via the connectors 25, 25.
rollers 20 and 2 against the center block 18.
The roller shafts 19 and 19 of the lead frame 1 are respectively swung downwardly as fulcrums and pressed onto the resin molded portions on both sides of the lead frame 1. Therefore, the center block 18 and side blocks 21, 21 are deformed to follow the convex warp of the lead frame 1, similar to the case where the lead frame 1 is warped concavely, causing the lead frame 1 to curve. Make sure to hold it. In this way, when the center block 18 and side blocks 21, 21 are pressed onto the resin molded portion of the lead frame 1 with sufficient pressing force, the cylinder tubes 5 of the chuck opening cylinders 50, 50 are pressed.
The air inside 1,51 is released to the atmosphere. Then,
The cylinder pistons 52, 52 and the pushers 55, 55 rise due to the spring force of the coil springs 54, 54, and one end of the pair of clamping claws 48, 48 sandwiched between the cylinder pistons 52, 52 and the pushers 55, 55. 48a, 48a move upward, and as a result, the pair of clamping claws 48, 48 rotate about the claw fulcrum shafts 49, 49, and the claw portions of the pair of clamping claws 48, 48 move in the width direction of the lead frame 1. Clamp the edges on both sides. When the pair of clamping claws 48, 48 clamps the lead frame 1, the movable frame 11
is raised and the lead frame 1 is transferred to a predetermined position. The same operation as above is repeated to sequentially transport a large number of stacked lead frames 1 to a predetermined position.

Although the above embodiment describes the case where the lead frame 1 is clamped, the present invention is not limited thereto, and any strip-shaped work can be clamped by the apparatus of the present invention.

Effects of the Invention This invention gives freedom to both side blocks equipped with a chuck unit relative to the center block so as to follow the warp of the unevenness of the strip-shaped work, and maintains a constant distance between the strip-shaped work and the chuck unit during chuck. As a result, even if the strip-shaped work is warped, it can be reliably held, and the strip-shaped work can be smoothly taken out, thereby improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a front half-sectional view of the main parts of the belt-shaped work chuck device according to the present invention, FIG. 2 is a front half-sectional view thereof, FIG. 3 is a side view, FIG. 4 is a front view of the lead frame, and FIG. FIG. 2 is an explanatory diagram showing a state in which lead frames are stacked. 1... Band-shaped work (lead frame), 11...
...Movable frame, 14... Center block fulcrum shaft, 18... Center block, 21, 21...
Side block, 23, 23... Side block support shaft, 35, 35... Lever support member, 37,
37... Block connection lever, 47, 47... Chuck unit, 48, 48... Clamping claw.

Claims (1)

[Claims] 1 A movable frame movable in the vertical direction; a center block supported vertically movably in the center of the movable frame; a center block attached to the lower end of a support shaft; a side block whose one end facing the movable frame is pivotally attached to the center block so as to be swingable, and whose other end is connected to a side block support shaft which is vertically movably supported on both sides of the movable frame; and a center block support. bridged between the upper end of the shaft and the side block support shaft, and
A block connecting lever having an intermediate portion pivotably attached to the movable frame, and a chuck unit having a pair of claws attached to the side block so as to be openable and closable, and clamping a strip-shaped work from the width direction with the pair of claws. A belt-shaped workpiece chuck device characterized by comprising: