JP2000124679A - Automatic electronic component-mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a mechanical chuck which is so provided with a mounting head as to be able to replace, to be possibly dealt as the same as a normal chucking nozzle. SOLUTION: A mechanical chuck 25 holds an electronic component 15 by vacuum suction by moving in the direction of a pair of sliders 47 approaching to close a clamp nail 2. Then a guiding pin 48 moves smoothly by moving along a notch trench 52 and in a guiding trench 50. Additionally, a body 38 of the mechanical chuck 25 is made to have a diameter which can be contained in a nozzle stocker 22 containing a chucking nozzle 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction nozzle, which is exchangeably mounted on a mounting head, communicates with a vacuum source, vacuum-suctions electronic components through a vacuum passage formed in the mounting head, and forms a vacuum on a printed circuit board. And an electronic component automatic mounting device for mounting the electronic component at a desired position.

[0002]

2. Description of the Related Art In an electronic component automatic mounting apparatus of this kind, in order to cope with various electronic components, a suction nozzle can be exchangeably mounted on a mounting head, and the suction nozzle is mounted in accordance with the type of component. . In such a case, depending on the type of electronic component, there are some that cannot be reliably removed only by vacuum suction, and instead of a normal suction nozzle,
In some cases, a mechanical chuck that grips and takes out and holds an electronic component by closing a pair of gripping claws may be used. For example, there is an electronic component such as a connector that is long vertically or has a hole in the suction surface. At this time, since the gripping force is easily increased to close the gripper, the gripper is closed when a positive pressure is applied to the mechanical chuck. However, in order to apply a positive pressure, that is, compressed air, a supply path of a positive pressure must be provided in the mounting head, which disadvantageously complicates the structure of the mounting head and increases its shape.

For this reason, as described in Japanese Patent Application Laid-Open No. 3-229498, a mechanical chuck having a structure in which a gripper is closed by a negative pressure has been proposed.

[0004]

However, in the above-mentioned prior art, the gripping claw swings to perform opening and closing operations. There is a problem in that it comes into contact with only the corners, and the side surface of the component cannot be reliably gripped. Further, if the mechanical chuck is too large, it cannot be handled like a normal nozzle, which is inconvenient.

Accordingly, an object of the present invention is to make it possible to handle a mechanical chuck that can be exchangeably attached to a mounting head as much as possible with a normal suction nozzle.

[0006]

According to the present invention, a suction nozzle, which is exchangeably mounted on a mounting head, communicates with a vacuum source and vacuum sucks electronic components through a vacuum passage formed in the mounting head. An electronic component automatic mounting apparatus that mounts at a desired position on a printed circuit board, has a gripper that slides on a straight line to open and close, is attached to the mounting head instead of the suction nozzle, and the vacuum passage is A mechanical chuck for closing the gripping claws and gripping the electronic component by vacuum suction is provided.

In the present invention, preferably, each of the pair of gripping claws has a guide portion for guiding the other when the opening and closing movement is performed.

Further, according to the present invention, a suction nozzle exchangeably attached to a mounting head communicates with a vacuum source and vacuum-sucks electronic components through a vacuum passage formed in the mounting head to thereby obtain a desired electronic component on a printed circuit board. In an electronic component automatic mounting device to be mounted at a position, a gripping claw that opens and closes is provided, is attached to the mounting head instead of the suction nozzle, and closes the gripping claw by vacuum suction through the vacuum passage to grip the electronic component. A mechanical chuck and a nozzle stocker for accommodating the suction nozzle are provided, and the mechanical chuck is sized to be accommodated in the stocker instead of the suction nozzle.

Further, in the present invention, preferably, the mechanical chuck is provided with a regulating member which comes into contact with the upper surface of the electronic component gripped by the gripping claws.

Further, in the present invention, preferably, the gripping claws are replaceably provided with respect to the mechanical chuck.

Further, in the present invention, preferably, the restricting member is provided so as to be replaceable with respect to the mechanical chuck.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 2, a pair of rails 5 for guiding the movement of the A beam 3 and the B beam 4 in the Y direction are provided on a base 2 of the electronic component automatic mounting apparatus 1. The A beam 3 and the B beam 4 are long in the X direction, and the mounting heads 7 and 8 are arranged so as to be movable along the longitudinal direction. Therefore, the mounting heads 7 and 8 can move in the XY directions. A ball screw shaft 11 rotated by an A-side Y-axis motor 10 is screwed into a nut (not shown) fixed to the A beam 3.
Can be moved along the rail 5 by the rotation of. Also,
The B beam 4 moves along the rail 5 when the ball screw shaft 12 having the same structure is rotated by the B-side Y-axis motor 14. Component supply units are formed at upper and lower positions in FIG. 2 of the base 2, respectively. In the component supply unit, component supply devices 16 for supplying various electronic components 15 are arranged in parallel in the X direction. The mounting head 7 is a component supply device 16
The electronic component 15 taken out from the substrate by vacuum suction is transported to a desired position on the printed circuit board 18 and mounted.

The printed circuit board 18 is conveyed by a conveyer 20 installed on the base 2 and is positioned and fixed at a predetermined position by a fixing mechanism (not shown).

The electronic component 15 taken out of the component supply device 16 is recognized by the component recognition camera 21 for a positional shift with respect to the mounting head 8.

A nozzle stocker 22 is installed on the base 2, and a suction nozzle 24, which is exchangeably mounted on the mounting heads 7, 8, is mounted as shown in FIGS. A mechanical chuck 25 can be attached to the mounting heads 7 and 8 instead of the suction nozzle 24. As shown in FIGS. 1 and 3, the mechanical chuck 25 is opened and closed by sliding a pair of clamp claws 27 on a straight line perpendicular to the axis thereof.

The present embodiment and Japanese Patent Application Laid-Open No. 3-229498
In comparison with the case where the claws are rocked as shown in the figure, when the clamp pawls 27 have the same plate thickness and the clearance between the open state and the closed state, that is, the movement distance of the claws is made the same, the structure in which the claws are rocked is considered. Since the outer diameter becomes larger when it is opened, it is advantageous to slide in the lateral direction as in the present embodiment. In particular, when the electronic component 15 is housed in the concave portion and the gap between the component 15 and the wall surface of the concave portion is small, the swinging claw is easily caught in an open state, which is disadvantageous.

The mounting head 7 above the mechanical chuck 25,
8 is formed in the same shape as the fitting portion 31 fitted to the mounting heads 7 and 8 above the suction nozzle 24, and the mechanical chuck 25 replaces the suction nozzle 24 with the mounting heads 7 and 8. It is made possible to be attached to. A diffusion plate 33 having the same shape as the diffusion plate 32 formed on the suction nozzle 24 is also formed on the mechanical chuck 25.

The diffusion plates 32 and 33 are formed in a size to be mounted in the mounting recess 35 of the stocker 22, and have a cylindrical portion 37 of the suction nozzle 24 and a body 38 of the mechanical chuck 25.
Is inserted into a hole 39 opening at the center of the mounting recess 35. That is, the holes 3 are larger than the outer diameters of the cylindrical portion 37 and the body 38.
9 has a large opening. The diameter of each of the holes 39 is the same in the stocker 22.
5 are also the same size,
Also, the mechanical chuck 25 can be placed. Since the body 38 of the mechanical chuck 25 is provided with a mechanism for opening and closing the clamp claws and the like, a large space is required, but the cylinder of the nozzle 24 having the largest diameter cylinder 37 among the various suction nozzles 24 is required. The stocker 2 formed smaller than the outer diameter of the suction nozzle 37 and capable of mounting the largest suction nozzle 24 thereon.
2 can be stored. Although not shown in FIG. 4, the nozzle stocker 22 is provided with a regulating claw 40 which engages with the upper portions of the diffusion plates 32 and 33 as shown in FIG. The regulating claw 40 is opened and closed on the nozzle stocker 22 when the nozzle 24 is replaced, so that the engagement can be released.

A mechanism for opening and closing the clamp claw 27 of the mechanical chuck 25 will be described with reference to FIGS.

A fitting portion 30 formed on the mechanical chuck 25
A vacuum hole 41 is opened in the upper part of the vacuum chuck 41 in the axial direction of the mechanical chuck 25, and a piston 43 reciprocates up and down in the vacuum hole 41. The vacuum holes 41 communicate with vacuum passages (not shown) formed in the mounting heads 7 and 8. The vacuum passage (not shown) communicates with a vacuum source (not shown), and the vacuum suction is turned on and off by opening and closing a valve (not shown). When the suction nozzle 24 is attached, the component 15 is suctioned through the vacuum passage.

One end of a link 46 swinging around a fulcrum 45 is engaged with a pin 44 projecting below the piston 43. The other end of the link 46 is
7 is engaged with the guide pin 48 projecting therefrom. Slider 47
, A clamp claw 27 is replaceably mounted. The other clamp claw 27 is mounted on the opposite side of FIG. 6 with a similar structure via a link 46 and a slider 47.

As shown in FIG. 8 and the like, the slider 47 has guide pins 48 projecting from both sides of the slider 47.
The guide 8 is guided and slid by moving in the guide groove 50 engraved in the guide groove 8. An extension portion 51 is formed on the slider 47 so as to extend in the longitudinal direction of the guide groove 50, and a notch groove 52 is formed in the extension portion 51. The guide groove 48 is inserted into the notch groove 52, and when the slider 47 moves, the guide pin 48 is guided by the notch groove 52 and is guided. That is, the pair of sliders 47 move in such a manner that they are guided by the guide pin 48, the notch groove 52, and the guide groove 50.

The clamp claw 27 is attached to a mounting piece 53 projecting below the slider 47 by a screw 54 so as to be replaceable.

Next, as shown in FIG. 11, a pair of restricting claws 55 as a restricting member project from the lower end of the body 38 of the mechanical chuck 25. The restricting claw 55 contacts the upper surface of the electronic component 15 held by the clamp claw 27 and plays a role of keeping its posture horizontal. The restricting claw 55 is also exchangeably attached to the body 38 by a screw (not shown).

The operation will be described below.

First, the mounting head 7 or 8 moves from the nozzle stocker 22 onto the stocker 22 in order to mount the mechanical chuck 25.

By driving a drive source (not shown), the regulating claw 4
0 is opened, the mounting head 7 or 8 is lowered, and the mechanical chuck 25 is mounted.

Next, when the automatic operation of the electronic component automatic mounting apparatus 1 is started, the mounting head 7 or 8 moves onto the component supply apparatus 16 and stops at the take-out position.

Next, the mounting head 7 or 8 is lowered and the mechanical chuck 25 is opened by a spring (not shown) as shown in FIGS.
7 is located.

Next, the vacuum in the vacuum passage in the mounting head 7 or 8 is turned on by a valve (not shown), the piston 43 is suctioned in the vacuum hole 41, and the clamp claw 27 is moved through the link 46 in FIGS. Close as shown in 6. FIG.
Although FIG. 6 does not show the electronic component 15, the electronic component 15 is actually gripped as shown in FIG.

When the mounting head 7 or 8 is lowered and the regulating claw 55 is in contact with the upper surface of the
Is performed, and the component 15 is gripped while maintaining the horizontal state. The timing of turning on the vacuum is the same as when suctioning the component 15 using the suction nozzle 24, and the apparatus 1 can control the on / off of vacuum without distinguishing the suction nozzle 24 or the mechanical chuck 25.

At this time, the swing of the link 46 causes the pair of sliders 47 to move toward the center from the state of FIG.
9, the guide pin 48 moves in the notch groove 52 and the guide groove 50, and smoothly slides without being caught. Guide dimensions for the slide movement at this time are as shown in FIG.

Next, the mounting head 7 or 8 is
11 is held and transported as shown in FIG. 11 and stopped so that the suction position thereof becomes the center of the screen of the component recognition camera 21, and the displacement of the electronic component 15 is recognized. At this time, light is applied to the lead wire portion of the component, and the reflected light is imaged by the camera 21. The diffusion plate 33 is appropriately darkened as its background.

Next, the mounting head 7 or 8 is moved to a position on the printed circuit board in which the center of the electronic component 15 is corrected to a position indicated by the mounting data (not shown) so as to correct the positional deviation. At this time, the electronic component 15
If the angle in the horizontal plane is designated, the angle of the head 7 or 8 is changed by an angle changing mechanism (not shown).

Next, the electronic component 15 is mounted on the printed circuit board 18. That is, at the time of mounting, the mounting head 7 or 8 descends, and the component 15 is pressed by the restricting claw 55 and pressed against the substrate 18 while keeping the level, the vacuum of the vacuum hole 41 is turned off, and the air blow is started. Then, the clamp claw 27 is opened. This air blow is to quickly cut off the vacuum and is not a strong positive pressure but is blown out at the same timing as in the case of the suction nozzle. In this case, even when the slider 47 moves to open the clamp claw 27, the guide pin 48, the guide groove 50, and the notch groove 52 allow the slider 47 to move without guiding the movement.

As shown in FIG. 12, the opening / closing of the needle valve 58 communicating with the variable clamping force valve 57 can be adjusted appropriately to adjust the clamping force of the clamp claw 27. That is, FIG. 12 shows a state in which the valve 57 is closed. By opening the valve 57, a vacuum leaks from the vacuum passage 60, the vacuum pressure in the vacuum hole 41 can be reduced, and the clamping force is reduced. Can be. The clamping force can be adjusted according to the degree adjusted by the needle valve 58. The valve 57 shown in FIG.
It is possible to adjust the clamping force with the same configuration even when the clamp claw 27 is closed with a positive pressure instead of closing the clamp claw 27 with a vacuum pressure.

[0038]

As described above, according to the present invention, since the gripping claws are closed by vacuum suction, and the gripping claws slide on a straight line, the same vacuum passage as the suction nozzle can be used.
Moreover, even parts having different width dimensions can be reliably gripped.

Further, since each of the gripping claws has a guide portion for guiding the other movement when the gripping claws are opened and closed, even if the moving distance of the gripping claws is short, it can be reliably guided, and the overall size of the mechanical chuck can be reduced. , The same handling as the suction nozzle is facilitated.

Since the size of the mechanical chuck is set to a size that can be stored in the stocker instead of the nozzle, the mechanical chuck can be stored in the same stocker as the suction nozzle.

Further, since the regulating member is provided on the mechanical chuck, the holding posture of the component can be stabilized.

Further, since the gripping claws are provided so as to be replaceable with respect to the mechanical chuck, the same mechanical chuck can handle gripping operations of various parts.

Further, since the restricting member is provided so as to be replaceable with respect to the mechanical chuck, the posture of various components can be stabilized even with the same mechanical chuck.

[Brief description of the drawings]

FIG. 1 is a front view showing a mechanical chuck applied to the present invention, with a clamp claw closed.

FIG. 2 is a plan view of the electronic component automatic mounting apparatus.

FIG. 3 is a front view showing a mechanical chuck applied to the present invention, in a state where clamp claws are opened.

FIG. 4 is a side view showing a nozzle stocker applied to the present invention.

FIG. 5 is a plan view showing a nozzle stocker applied to the present invention.

FIG. 6 is a partially broken front view showing an opening / closing mechanism of a clamp claw of the mechanical chuck, and is a view showing a state where the clamp claw is closed.

FIG. 7 is a partially broken front view showing an opening / closing mechanism of a clamp claw of the mechanical chuck, showing a state where the clamp claw is opened.

FIG. 8 is a cross-sectional plan view showing a moving mechanism of a slider of the mechanical chuck, showing a closed state.

FIG. 9 is a sectional front view showing a moving mechanism of a slider of the mechanical chuck, and is a view showing a closed state.

FIG. 10 is a side view in which a part of a mechanism for moving a slider of the mechanical chuck is broken.

FIG. 11 is a sectional front view showing a moving mechanism of a slider of the mechanical chuck, and is a view showing an opened state.

FIG. 12 is a partially broken side view showing a state in which a regulating claw provided on the mechanical chuck regulates an electronic component.

FIG. 13 is a diagram showing a vacuum circuit that varies the clamping force of a clamp claw by a clamping force variable valve.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electronic component automatic mounting device 7 mounting head 8 mounting head 15 electronic component 18 printed board 22 nozzle stocker 24 suction nozzle 25 mechanical chuck 27 clamp claw (gripping claw) 47 slider 48 guide pin (guide portion) 50 guide groove 52 notch groove 55 Regulation claw (Regulation member)

Claims (6)

[Claims] A suction nozzle exchangeably attached to a mounting head communicates with a vacuum source to vacuum-suction an electronic component through a vacuum passage formed in the mounting head and mount the electronic component at a desired position on a printed circuit board. The electronic component automatic mounting apparatus includes a gripping claw that slides on a straight line to open and close, is attached to the mounting head instead of the suction nozzle, and closes the gripping claw by vacuum suction through the vacuum passage. An electronic component automatic mounting device, comprising a mechanical chuck for gripping components. 2. The electronic component automatic mounting apparatus according to claim 1, wherein each of the pair of gripping claws has a guide portion for guiding the movement of the other when the opening and closing movement is performed. 3. A suction nozzle exchangeably mounted on a mounting head communicates with a vacuum source and vacuum-suctions electronic components through a vacuum passage formed in the mounting head to mount the electronic components at a desired position on a printed circuit board. A mechanical chuck that has a gripper that opens and closes, is attached to the mounting head in place of the suction nozzle, closes the gripper by vacuum suction through the vacuum passage, and grips the electronic component. And a nozzle stocker for accommodating the suction nozzle, wherein the mechanical chuck is sized to be accommodated in the stocker instead of the suction nozzle. 4. The automatic electronic component mounting apparatus according to claim 1, wherein the mechanical chuck is provided with a regulating member that contacts an upper surface of the electronic component held by the holding claw. 5. The electronic component automatic mounting apparatus according to claim 1, wherein the gripping claws are replaceably provided to the mechanical chuck. 6. The automatic electronic component mounting apparatus according to claim 1, wherein the restricting member is provided so as to be replaceable with respect to the mechanical chuck.