JPS6339368B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a component posture correction device in a device that suctions and transports components during component assembly.

(b) Conventional technology When supplying parts for product assembly, if the parts are small and lightweight, they are often transported by vacuum suction. Such examples are often seen in the handling of semiconductor pellets and chip-shaped electronic components. By the way, in cases where semiconductor pellets or chip-shaped electronic components are conveyed by vacuum suction, the suction means also serves as a mounting means, and the suction means is also pressed against an object (for example, a board) to mount the components. In most cases, this is the case. When using the device in this manner, it is necessary to maintain the correct attitude (position, angle) of the component relative to the suction means in order to mount the component accurately. Therefore, it is often done to correct the posture of the part by holding the part being sucked using a group of two or more claws. For example, there is a device described in Japanese Patent Application Laid-Open No. 49-79476.

(c) Problems to be solved by the invention The device described in JP-A-49-79476 has the following problems:
It is designed to handle parts with a single dimensional standard. However, if we look at the current state of chip-shaped electronic components, they are produced and used in a wide variety of sizes. When trying to mount chip-shaped electronic components of various sizes on the same board, it is uneconomical to have multiple types of mounting devices tailored to the size of the parts, so a single mount can be used for as many types of parts as possible. I would like to do this, but the following problem occurred. In other words, if the opening of the claw group is widened so that large parts can be accepted, and the opening/closing stroke is made large so that the tips of the claws can reach even small parts, the claws will be able to reach the small parts. The speed will be more than enough, and the small parts will be subjected to excessive impact. When dealing with brittle materials such as semiconductor pellets and ceramic chip capacitors, there is an extremely high risk that these materials will crack or chip. The present invention aims to solve such problems.

(d) Means for Solving the Problems In the present invention, a plurality of clamping portions corresponding to different types of components are formed in different stages in a group of claws for clamping sucked components. The support means for the suction means supports the suction means at a position above the claw group and aligned with the center of the claw group. The suction means is given vertical movement by the lifting means. Further, a clamping selection means is provided for setting the amount of descent of the suction means to a predetermined selection value.

(e) Action Which of the plurality of clamping parts formed at different levels actually clamps the component depends on the height at which the component stops in the claw group, that is, the descent of the suction means. Determined by quantity. Therefore, if the amount of descent of the suction means is set appropriately by the clamping portion selection means,
You can select the clamping part according to the shape of the part, such as a clamping part with a large opening for large parts, and a suction part with a small opening for small parts. can be added.

(F) Example The example shows an apparatus for mounting chip-shaped electronic components on a printed wiring board, in which 1 is a base, 2 is a rotary index table placed on the top of the base 1, and 3 is a rotary index table. This is a shelf board placed on the top of 2. The rotary index table 2 constitutes a support means for a vacuum chuck 4, which is a suction means. Vacuum chuck 4 is
They are arranged at appropriate intervals on the rotary index table 2, and one work station picks up chip-shaped electronic parts 5A, and another station picks them up.
It is placed on a printed wiring board 7 (FIG. 7) on a Y table 6. The vacuum chuck 4 passes vertically through the guide sleeve 8 and has a suction nozzle 9 at its lower end. The suction nozzle 9 can be retracted upward, and is normally pushed downward by a compression coil spring 10. A detent member 11 is fixed to the upper end of the vacuum chuck 4. The anti-rotation member 11 holds the ball 12 installed on the rotary index table 2 between a pair of rollers 13, and prevents the vacuum chuck 4 from rotating while moving up and down together with the vacuum chuck 4. The vacuum chuck 4 is constantly pushed upward by a compression coil spring 14, and pushed down by a pusher 15 on the lower surface of the shelf board 3 at a required work station. Pushya 15 is shelf board 3
It is connected to the upper bell crank 16 by a link rod 17. A cam follower roller 20 is provided at the other end of the bell crank 16 and faces a face cam 19 attached to a camshaft 18. The bell crank 16 is urged to rotate clockwise in the figure by a tension coil spring 21.
As the face cam 19 moves, the pusher 15 is pushed and the vacuum chuck 4 is pushed down.

The lift applying means is composed of the pusher 15, the bell clamp 16, and the face cam 19 as main components. The downward force of the pusher 15 is designed to be sufficiently larger than the upward force of the compression coil spring 14. When the vacuum chuck 4 is pushed down by a predetermined amount, the contact roller 22 of the bell crank 16 abuts against the stopper 23 to stop the vacuum chuck 4 from descending. The stopper 23 constitutes a clamping portion selection means. The vacuum chuck 4 is connected to the suction turret 24 in the center of the rotary index table 2.
via an air valve 25. The air valve 25 is of a type that closes when the actuator 25 is not pressed and opens when the actuator 25 is pressed, and a cam plate 27 is suspended below the shelf board 3 for opening/closing control. The actuator 26 slips under the cam plate 27 from the suction station and continues to be pushed until the transfer station. At the transfer station, the actuator 26 is connected to a cam plate 27 as shown in FIG.
It stops under Tappet 28, which is lined up with Totsurai. If you press the parts in place here, Tappet 2
8 rises to cut off the suction and remove the component from the suction nozzle 9. Solder paste is applied to the parts mounting area of the board 7, and when heated in the next step, the board 7 and the part 5A are firmly bonded. Now, regarding the arrangement of components on the board, the orientation of the components 5A differs depending on the location, so when placing the components on the board, it is necessary to arrange the orientation of each component. In the example, the parts can be oriented in two ways: in the same position as when they were picked up, or in a direction perpendicular to this, and only those that are necessary are twisted by 90 degrees at a correction station between the suction station and the transfer station. Become.

A correction chuck 29 having a group of four claws is arranged in the correction station. base 1
However, it serves as a support means for the correction chuck 29 and, in turn, for the nail group. The pawls 30 are pivotally supported by a hollow chuck main body 31 at 90° intervals, and the opposing pawls 30 are connected by a tension coil spring 32 and urged toward the center. A pin 3 protruding toward the center of each claw 30
3, the pins 33 converge toward one point and abut against the upper conical portion of the cam follower rod 34. The cam follower rod 34 is pressed against the lower cam 36 by a compression coil spring 35. During the rising phase of the cam follower rod 34, the four pawls 30 are pushed outward, and when the cam follower rod 34 falls, they gather toward the center. Then, the vacuum chuck 4 is stopped at a position aligned with the correction chuck 29, and while the claws 30 are open, the vacuum chuck 4 is pushed down and the part 5A is inserted between the claws 30. Next, when the claws 30 are closed, the component 5A is clamped as shown in FIG. 2, and as a first step in posture correction, the component 5A is centered relative to the suction nozzle. If this part 5A requires a 90° twist, use the straightening chuck 29.
A rotary actuator 38 connected by a timing belt 37 is operated by pneumatic pressure to rotate the correction chuck 29 through 90 degrees, and then the claw 30 is opened.
If the parts 5A do not need to be changed, only the centering of the parts 5A with respect to the suction nozzle 9 is performed, and the claws 30 are opened. The vacuum chuck 4 is then raised and sent to the transfer station.

A feature of the present invention is that parts having different sizes and shapes can be corrected using the same device. That is, in the state shown in FIG. 2, when the claws 30 grip a part larger than the part 5A, the abutment 39 on the inner surface of the claws 30 floats away from the chuck body 31, making centering unstable. Further, in the case of a component with a terminal protruding from the side surface, the shape of the tip of the claw 30 must be changed. The present invention attempts to solve this problem by providing a multi-stage clamping portion at the tip of the claw 30. In the embodiment, a cutout 40 for holding the large component 5B is provided at the upper part of the claw 30, so that the claw 30 has two stages. Accordingly, the lowering position of the vacuum chuck 4 must also be switched to two stages, but this can be adjusted with the stopper 23. That is, the stopper 23 rotates around its lower end, and its upper end forms a cam surface. When the angle of the stopper 23 is changed by the solenoid 41, the vacuum chuck 4 is stopped at a higher position than before with respect to the claw 30, as shown in FIG. This causes the large component 5B to stop at a height that matches the notch 40.

(g) Effects of the Invention According to the present invention, it is possible to equalize the impact received when a part is clamped by a group of claws, regardless of the size of the part, and it is possible to make it possible to equalize the impact received when a part is clamped by a group of claws. In order to adapt the height of the suction means to one of the different level clamping parts for parts of various shapes, the suction means can be made to have a smaller mass than the pawl group while leaving the pawl group as is. By raising and lowering it, we can speed up the movement and improve efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 to 3 are partially sectional front views of main parts.
The figure shows the state before the start of straightening, FIG. 2 shows the state after the start of straightening, and FIG. 3 shows the state when different types of parts are being straightened. Figure 4 is an explanatory diagram of the operation of the air valve, Figure 5
6 is a top view of the correction chuck, FIG. 6 is a top view of the vacuum chuck portion, and FIG. 7 is a plan view illustrating the combination of the printed wiring board and components. 5A, 5B...Parts, 4...Vacuum chuck (suction means), 30...Claw, 2...Rotary index table (supporting means for suction means), 1...
Base (supporting means for claw group), 15, 16, 19...
... pusher, bell crank, phase cam (lifting means), 23... stopper (clamping section selection means).

Claims (1)

[Claims] 1. A component mounting posture correction device comprising the following components. (a) A suction means for suctioning parts; (b) A claw that performs an opening and closing motion to clamp the part and correct the suction posture, and has a plurality of clamping parts corresponding to different types of parts formed in different stages. Group (c) Support means for the claw group; (d) Support means for the suction means for supporting the suction means above the claw group and in a position aligned with the center of the claw group; (e) Support means for the suction means for supporting the suction means in the claw group; and descend towards the
lifting/lowering applying means (f) for raising from there; a clamping part that determines which of the plurality of clamping parts is used to clamp the component by setting the amount of descent of the suction means to a predetermined selection value; means of selection.