JPS61140418A - Belt-like work chuck device - Google Patents

Abstract

PURPOSE:To reliably chuck even a reversed work by swayably supporting side blocks having a chuck on a center block constituted movably up and down in the said device for a lead frame for semiconductors. CONSTITUTION:When a movable frame 11 is lowered to hold a lead frame, if the lead frame has a camber, side blocks 21, 21 are first pressed to the lead frame 1. Therefore, the side blocks 21, 21 are swayed around a roller shaft 19 to lift a support shaft 23. Therefore, the side blocks 21, 21 are swayed around a roller shaft 19 to lift a support shaft 23. Thereby, a lock connecting lever 37 is swayed around a fulcrum axis 38 via a roller fitting member 21, a roller shaft 33, and a roller 34 to press a center block support shaft 14 downward. Thus, a center block 18 is pressed to the lead frame 1, and the blocks 18, 21, 21 are deformed so as to follow the camber. According to this constitution, chucking is made reliable and production can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. This invention provides a method for stacking a large number of strip-shaped workpieces, such as lead frames for semiconductor devices, from the top layer.
This invention relates to a belt-like workpiece chuck device that clamps and takes out workpieces one by one.

Conventionally, as shown in Fig. 4, a large number of lead frames (1) in which the main parts including semiconductor elements are molded in resin are stacked in stacks as shown in Fig. 5. When taking out the lead frame (1) one by one from the top layer, hold the lead frame (1) on both sides in the width direction with a pair of opening/closing claws at two points equidistantly apart from the center position in the longitudinal direction of the lead frame (1). It is common to do this by

Man 51 - Cage ′ Trying By the way, in conventional chuck devices, the claws that hold the lead frame (1) open and close in a fixed position during chucking, so the lead frame (1) may warp, etc. If the lead frame (1) is bent, it is difficult to hold the lead frame (1) with the claws, and this causes a problem in that the lead frame (1) cannot be taken out smoothly.

Therefore, while correcting the warpage of the lead frame (1),
A device that clamps this has been proposed, but such a device has the disadvantage that it is not possible to correct two types of warpage (concave and convex) with a single device, and that the structure is complicated and large. Ta.

° This invention described in item 5 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; One end facing the center block was pivotally attached to the center block, and the other end was connected to a side block support shaft supported on both sides of the movable frame so as to be movable in the vertical direction. a block connecting lever which is bridged between a side block, an upper end portion of the center block support shaft and an upper end portion of the side block support shaft, and whose intermediate portion is swingably pivoted to the movable frame; The chuck unit includes a pair of claws attached to the side block so as to be openable and closable, and a chuck unit that clamps a strip-shaped workpiece from both sides in the width direction with the pair of claws.

Moreover, this invention provides a degree of freedom to the side blocks relative to the center block as described above, and by installing a chuck unit that clamps the strip-shaped work in the side blocks, the side blocks can be prevented from warping due to unevenness of the strip-shaped work. The distance between the belt-like workpiece and the chuck unit is always kept constant during chucking.

Figures 1 to 3 show an embodiment of the belt-shaped work chuck device of the present invention.The lead frame (1), in which the main portion including the semiconductor element described above is molded with resin, is placed in a predetermined position. Many sheets are stacked on top of each other. In Figures 1 to 3, (11) is two parallel guide rods (12) (
This is a movable frame that is supported so as to be vertically movable via ball bushes (13) (13) on 12), and can be moved vertically by the expansion and contraction of a vertically movable cylinder (not shown) attached to the fixed frame. ing. (
14) is a center block support shaft that is inserted into and supported by a guide tube (15) integrally formed in the center of the movable frame (11) via a ball bush (16) so as to be movable up and down, and a bolt (17) is attached to the lower end. Center block (through
18) is fixed. This center block (18)
are provided with roller shafts (19) passing through them on both sides, and rollers (20) (20) are rotatably provided on each end of the roller shafts (19). The long windows (22) (22) provided at the base of the side blocks are arranged on both sides of the side blocks, and the long windows (22) (22) are engaged with the rollers (20) (20) of the center block (18), respectively. (2
0) (20) The roller shaft (19) (19) is provided so as to be swingable about the fulcrum. (23) (23) has ball bushings (24) on both ends of the movable frame (11).
(24) is a side block support shaft that is inserted and supported so as to be vertically movable, and has a connector (25) (
25) are attached, and furthermore, the tips of the side blocks (21) (21) are pivotally attached to the lower ends of the connectors (25) (25) via pins (26) (26).

(27) is a roller mounting member fixed to the upper end of the center block support shaft (14) via a bolt (28).The roller shaft (29) (29>) is protruded from both sides, and the roller (30) is attached to the tip of the roller mounting member. ) (30) are rotatably provided.(31) (31) is a side block support shaft (23) A bolt (32) is attached to the upper end of (23).
The roller mounting member is fixed via (32), and roller shafts (33) (33) are provided protruding from both sides, and rollers (34) ($4) are rotatably provided at both ends thereof. (35) (35) is an abbreviated lever support member that is fixed to the symmetrical position on both sides of the upper surface of the movable frame (11) via (36) (36), and the block connecting lever ( 37) The intermediate portion of (37) is pivotally supported via lever fulcrum shafts (38) (38). The block connecting lever (37) (37) has one end (37a) (37a) fixed to the upper end of the center block support shaft (14).
), and the other end (37b) (37b) is fixed to the upper end of the side block support shaft (23) (23). ) mounted on the roller (
34) (34) and the center block support shaft (14) and side block support shaft (23) (23)
). (39) (39) is a spring latching bolt screwed onto both sides of the center part of the movable frame (11), and between the spring latching bolts (40) (40) protruding from the center block (1st). Coil spring (41)
(41) respectively, - center block (18)
upwardly biasing the center block support shaft (14),
Roller mounting member (27) and roller shaft (29) (2
9) to one end (37a) of the block connecting lever (37) (37) ('
37a) is always elastically abutted. (42
) (42) is a spring retaining bolt screwed onto both ends of the movable frame (11), and is attached to the side block (21).
Coil springs (43) (43) are stretched between the pins (26) (26) of (21), respectively, and the side block (18) is urged upward to connect the connector (25) (
25) , side block support shaft (23) (23)
, roller mounting members (31) (31) and roller shaft (3
3) Roller (34) through (33) (34)
the other end (37b) of the block connecting lever (37) (37).
) (37b) is always elastically abutted.

In addition, coil spring (41) and coil spring (43) (
The spring force of 43) is set to balance with the weight of each member. (44) (44) is a spring locking pin that is protruded from the roller mounting member (27) and extends in a direction perpendicular to the roller shaft (29). ) Spring retaining bolt (45) Screwed onto the outer peripheral wall of (45)
6) (46) are stretched respectively and the movable frame (11
) is always biased upward. (47) (47) is a chuck unit consisting of a pair of clamping jaws (48) (48) provided on the side block (21) (21), with the intermediate part of the pair of clamping jaws (48) (48) serving as the jaw fulcrum. shaft(
49) (49) through the side block (21) (
21), and a pair of clamping claws (48).
One end (48a) of (48) (48a) is connected to the cylinder tube (50) of the chuck opening cylinder (50) provided on the side block (21) (21).
1) Cylinder piston (5) housed in (51)
2) (52) and side block (21) (2
The chuck opening is housed in the accommodation hole (53) (53) formed at pusher (55) (
55).゛Next, the operation of the above embodiment will be explained. Note that 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 lifted up to a predetermined position by an appropriate lifting mechanism. The lead frames (1) are lifted all at once upward, and the next highest lead frame (1) is positioned at the chuck level.

First, air is supplied into the cylinder tube (51) (51) of the chuck opening cylinder (50) (50), and the cylinder piston (52) (52) in the cylinder tube (51) (51) and the accommodation hole ( 53)(
When the pusher (55) (55) inside 53) is pushed down against the spring force of the coil spring (54) (54), the space between the cylinder piston (52) (52) and the nosher (55) (55) One end (48a) (48a) of a pair of clamping claws (48) (4B) sandwiched between
) moves downward, so the pair of clamping claws (4B)
(48) rotates around the pawl fulcrum shaft (49) (49) and expands. When the pair of clamping pawls (48) (48) expands, the movable frame is moved by the cylinder for vertical movement, (
11) is lowered by a fixed stroke, and this movable frame (11)
), the center block (18) and both lower thigh blocks (21) (21) are also lowered by the same amount. At this time, if the lead frame (1) is warped, the center block (18) and both side blocks (2
1) (21) is pressed onto the resin molded part of the lead frame (1) with sufficient pressing force while remaining connected in the linear shape shown in FIG. In addition, if the lead frame (1) has a concave warp, first remove both side blocks (21) on the way down just before reaching the chuck level.
) (21) are pressed onto the resin molded parts on both sides of the lead frame (1), but after that, when continuing to descend to the chuck level, both side blocks (21) are pressed onto the resin mold parts on both sides of the lead frame (1).
1) (21) is pressed against both sides of the lead frame (1) with sufficient pressing force, and at the same time, the roller (20) (20) is pressed against the center block (18) by the force that warps the lead frame (1). ) roller shaft (19)
(19) as a fulcrum, each swings upward to connect the connector (2).
5) Connect the side block support shaft (23) through (25) (
23), thereby raising the roller mounting member (31).
) (31), the block connecting lever (37) (37) is connected to the lever fulcrum shaft (38) (
Roller (30) (30) swings around 38) as a fulcrum.
, roller shaft (29) (29) and roller mounting member (
27) to lower the center block support shaft (14), and by lowering the center block support shaft (14), sufficient pressing force is applied to the center block (18) onto the resin molded part in the center of the lead frame (1). Press it with it. Therefore, the center block (18) and both side blocks (21) (21) deform to follow the concave curvature of the lead frame (1).
) to ensure that it is maintained. 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 the descent just before reaching the chuck level. However, when the center block (18) continues to descend to the chuck level, the center block (18) is pressed with sufficient pressing force onto the resin molded part in the center of the lead frame (1), and at the same time, the center block (18) The center block support shaft (14) is raised by the reaction force of the roller mounting member (27) and the roller shaft (29) (29
) and rollers (30) (30) connect the block connecting lever (37) (37) to the lever fulcrum shaft (38).
Roller (34) swings around (38) as a fulcrum (34)
, roller shaft (33) (33) and roller mounting member (
31) Side block support shaft (23) via (31)
(23) and lower the side block support shaft (23) (2
3) lowers both side blocks (21) (21) to the center block (18) via the connectors (25) (25).
) are respectively swung downward about the roller shafts (19) and (19) as fulcrums, and are pressed onto the resin molded parts on both sides of the lead frame (1). Therefore, the center block (18) and side blocks (21) (21>) are similar to the case where the lead frame (1) is warped in a concave shape as described above.
It deforms to follow the convex warp of the lead frame (1) and securely holds the lead frame. in this way,
Center block (18) and side block (21)
(21) When pressed with sufficient pressing force onto the resin molded part of the t-lead frame (1), the cylinder tube (51) of the chuck opening cylinder (50) (50)
) Release the air in (51) to the atmosphere. Then,
Due to the spring force of the coil springs (54) (54), the cylinder piston (52) (52) and the pusher (55)
) (55) rises, which causes one end (
48a) (48a) moves upward, and as a result, the pair of clamping claws (48) (48) move towards the claw fulcrum shaft (48a).
9) Rotate around (49) as a fulcrum and attach the pair of clamping claws (4B).
> The claw portions (4B) clamp both widthwise edges of the lead frame (1). A pair of clamping claws (48) (4B
) grips the lead frame (1), raises the movable frame (11), and transports the lead frame (1) 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 held, the present invention is not limited thereto (any strip-shaped work can be held by the apparatus of the present invention.

38 (Company) 1 This invention follows the curve of the unevenness of the strip-shaped work.
Both side blocks equipped with chuck units have a degree of freedom relative to the center block, and the distance between the strip-shaped work and the chuck unit is kept constant during chucking, so even if the strip-shaped work is warped, it can be held securely. The belt-shaped workpiece can be taken out smoothly, and productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front half-sectional view of the main part of the belt-like work chuck device according to the present invention, FIG. 2 is a plan view of the half-sectional surface, FIG. 3 is a side view, FIG. The figure is an explanatory diagram showing a state in which lead frames are stacked. (1) - Strip 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, (4B)
(48)-Pinching claw. Empress Patent applicant: Nichiden Machinery Co., Ltd. Agent: Shogo Ebara (White 1 Set 2 No. 8!i0

Claims (1)

[Claims] (1) A movable frame movable in the vertical direction, a center block attached to the lower end of a center block support shaft supported movably in the vertical direction in the center of the movable frame, and arranged on both sides of the center block, A side block whose one end facing the center block is pivotably attached to the center block, and whose other end is connected to a side block support shaft which is vertically movably supported on both sides of the movable frame; A block connecting lever that is bridged between the upper end of the block support shaft and the side block support shaft, and whose intermediate portion is swingably pivoted to the movable frame, and a pair of claws on the side block that open and close the lever. What is claimed is: 1. A belt-shaped work chuck device comprising: a chuck unit that can be attached to the belt-shaped workpiece and clamps the belt-shaped workpiece from the width direction with the pair of claws;