JPH0572759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for adjusting the angle of electronic components used when mounting minute electronic components on an electric circuit board.

Conventional examples, configurations, and their problems Conventionally, when attaching leadless microelectronic components such as chip resistors and chip multilayer capacitors to electronic circuit boards, adhesive was applied to the necessary locations on the circuit board. A method is adopted in which the electronic components are first placed on the circuit board and then sequentially supplied and bonded to the circuit board. A circuit board to which electronic components are bonded is electrically connected using solder dips.

In this way, as a device for mounting electronic components,
It has been proposed that a rotating index type component mounting head is provided with a large number of suction nozzles, and these suction nozzles sequentially suction electronic components at a component receiving position, transport them to a component mounting position, and mount them on a circuit board. To adjust the angle of the electronic component to a desired angle with respect to the circuit board, the electronic component is held between the adjustment claws at the stop position of the suction nozzle, and the adjustment claws are rotated to rotate the electronic component relative to the suction nozzle. However, since the electronic components were rubbed against the suction nozzle, there was a risk of scratches.

To prevent this, we devised a device that rotates the entire chuck that holds the electronic components. The rotation driving means for the chuck is provided at the transport stop position of the chuck, and its driving gear is removably engaged with a gear integrated with the suction nozzle to transmit rotation. According to this, the angle can be adjusted to any desired angle without damaging the electronic components. In addition, since the chuck rotation drive means is provided at the stop position,
Unlike those in which a rotational drive means is provided on the component mounting head side on which a chuck is mounted, the movable parts are lighter and more compact.

However, because the drive gear was returned to the reference angle after each angle adjustment, when the drive gear was moved to mesh with the chuck side gear, the teeth of the same part of the drive gear always hit the chuck side gear. This caused the problem that the drive gears would wear locally due to meshing impact. The drive gear consists of multiple chuck gears provided on the component mounting head.
Since the rollers are rotated one after the other, the problem of wear mentioned above is serious.

Purpose of the Invention The present invention provides a method for adjusting the angle of an electronic component, which can adjust the angle to an arbitrary angle without damaging the electronic component, and can prevent local wear of drive teeth that are driven by engaging and disengaging from a gear on the chuck side. The purpose is to

Structure of the Invention In the method of the present invention, an electronic component is held in a chuck and transported along a fixed path, and a drive gear is removably engaged with a gear provided on the chuck at a stop position during transportation, and the drive gear is driven to A method for adjusting the angle of electronic components by rotating a chuck, in which each electronic component is sequentially rotated by arbitrary angles θ ₁ , θ ₂ , ... θn (n is an integer greater than 2) with respect to a reference direction. In this case, the drive gear is not returned to the original angle each time the angle is adjusted.
Angle ₍ θ _{1 +}
θ ₂ , ... θ ₁ + θ ₂ + ... θn).

According to the method of this invention, since the electronic component is rotated together with the chuck, there is no problem of the electronic component being scratched by rubbing against the chuck or the like. Also, the drive gear is engaged and disengaged from the gear on the chuck side, but the drive gear is
Since the rotation is performed sequentially to the added angle and the rotation is not returned to the original angle each time, the position of the teeth changes when meshing with the chuck side gear of the drive gear. Therefore, local wear of the drive gear due to meshing impact can be prevented.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIGS. 1 to 10. In Figures 1 to 3, reference numeral 1 denotes a base, and an XY table 4 on which two circuit boards 2 and 2' are placed side by side on the left and right sides of the figure is installed at the front, and on the circuit board 2' on the right side. An adhesive applicator 5 applies adhesive to the circuit board 2, and an electronic component 8 is placed on the left circuit board 2.
A component mounting head 6 for mounting the parts is arranged in parallel. After applying the adhesive, the circuit board 2 on the left side is
It is shifted from the right side on the XY table 4. A component supply rotor 7 is installed behind the component mounting head 6. The component mounting head 6 has ten chucks 9 that hold electronic components 8 arranged at equal intervals in the circumferential direction, and is intermittently rotated about the vertical axis at the pitches at which the chucks 9 are arranged. The head frame 29 of the base 1 is provided with an upper drive section 50 for driving various parts;
A head drive cam unit 51 is provided.
The XY table 4 moves left and right (in the X-axis direction) and back and forth (in the Y-axis direction), thereby changing the component mounting position on the circuit board 2 and the adhesive application position. On both sides of the XY table 4, there are circuit boards 2,
A carry-in guide rail 19 and a carry-out guide rail 20 are installed. The component supply rotor 7 is rotatably provided around a vertical axis 21, and has a number of component supply cassettes 22 removably attached to its outer periphery.

Each chuck 9 of the component mounting head 6 consists of a suction nozzle 13 and a pair of regulating claws 14, as shown in FIG. The regulating claw 14 is the suction nozzle 1
This is to adjust the position of the electronic component 8 that is attracted to the electronic component 3 in one direction (X-axis direction). Position adjustment in the direction perpendicular to this (Y-axis direction) is performed by a pair of adjustment claws 106 of the component position adjustment device 10 installed on the base 1. Among the ten chuck stop positions _S1 to _S10 of the component mounting head 6, a component position adjustment device 10 is arranged at position _S3 , and a component detection device 1 is arranged at position _S4 .
1 is installed. A chuck rotating device 12 and a chuck return rotating device 12' are installed at positions _S5 and _S7 , respectively, and a parts receiving box 196 is placed at position ₈ . The stop positions S ₂ and S ₁₀ are the detection positions of the chuck rotation origin position, and the sensor 19
7,198 are provided. The defective parts discharge position _S8 also serves as a chuck return rotation detection position, and a sensor 199 is provided therein.

As shown in FIGS. 5 and 6, the component mounting head 6 has a slide bearing 25 on the outer periphery of the rotating frame 24.
The chuck mounting shaft 26 is mounted so as to be able to move up and down and rotate freely. The slide bearing 25 is
It has a bearing metal 25a. The chuck 9 is provided at the lower end of the chuck mounting shaft 26. Rotating frame 2
4 is fixed to the rotating main shaft 27. The rotating main shaft 27 is supported by a cylindrical main shaft housing 30 projecting from the lower surface of the head frame 29 of the base 1 so as to be horizontally rotatable.

As shown in FIG. 6, the chuck mounting shaft 26 has a sleeve 33 fitted onto the upper part thereof, and a vertical drive block 34 and a chuck transmission gear 3 are attached to the sleeve 33.
5 and a rotation lock member 75 are fitted onto the outside. These are prevented from coming off from the sleeve 33 by a C-shaped retaining ring 37. The chuck transmission gear 35 is
It meshes with the chuck drive gear 36 of the chuck rotation device 12 (FIG. 5). In addition, the boss portion of the chuck transmission gear 35 has a groove 35 which is detected by sensors 97 and 98 (FIG. 4) for detecting the rotational origin position.
A is provided. The upper end of the sleeve 33 engages with a chuck mounting shaft vertical adjustment nut 38 screwed onto the upper end of the chuck mounting shaft 26. The weight of the chuck mounting shaft 26 is supported by a chuck mounting shaft lifting spring 39 via a vertical drive block 34. The chuck mounting shaft lifting spring 39 is housed within a cylindrical rotation preventing and spring holding shaft 40 .
The anti-rotation and spring holding shaft 40 is connected to the chuck mounting shaft 2.
Guide hole 41 formed in slide bearing 25 of No. 6
It is fitted in such a way that it can be raised and lowered freely.

The vertical drive block 34 includes a cam follower 4.
2 is rotatably attached, and a vertical drive groove 4
3 is formed. The cam follower 42 engages with a groove-shaped chuck vertical fixing cam 44 (FIG. 6) provided around the entire outer periphery of the main shaft housing 30 (FIG. 5). The fixed cam 44 for raising and lowering the chuck maintains an appropriate height of the chuck relative to each device such as the component position adjustment device 10 and the component detection device 11 arranged at each of the chuck stop positions S ₁ to S ₁₀ . Note that if each device such as the component position adjustment device 10 is arranged at a constant height, the chuck up/down fixing cam 44 is not necessary. Vertical drive groove 43 of vertical drive block 34
is engaged with a suction cam lever and a mounting cam lever (both not shown) provided at the component receiving position S and component mounting position _S6 , and the chuck mounting shaft is raised and lowered by these cam levers.

The chuck transmission gear 35 is integrally fastened to the chuck mounting shaft 26 by a fastening bolt 61.
The rotation lock member 75 is connected to the vertical drive block 34.
The chuck transmission gear 35 is mounted so as to be movable forward and backward in the radial direction of the chuck transmission gear 35.
4 has a lock pawl 36a that engages with the lock pawl 36a in a detachable manner. The rotation lock member 75 is always urged in the direction in which the lock pawls 75a engage with each other by a lock spring 62 provided between it and the vertical drive block 34 to lock the rotation. By pressing 36, rotation of the chuck transmission gear 35 is enabled.

As shown in FIGS. 7 and 8, the chuck rotation device 12 has a chuck drive gear 36 that meshes with the chuck transmission gear 35 attached to the tip of a rotary lever 63, and rotates the chuck drive gear by rotating the rotary lever 63. 36 to and from the chuck transmission gear 35. The chuck drive gear 36 is
It is attached integrally with a pulley 65 to a support shaft 64, and is driven by a pulse motor 68 via a timing belt 67. 69 is a pulse motor 68
The pulley 70 is a tension pulley. The pulse motor 68 is fixed to the rotating arm 63. A rotation detection plate 71 is attached to the pulse motor 68, and a sensor 72 is fixed to the rotation lever 63 with screws 74 via a sensor holding plate 73. Further, a lock release dog 75' is attached to the support shaft 64 of the chuck drive gear 36 for pushing a lock member 75 (FIG. 6) of the chuck transmission gear 35. A support shaft 76 of the rotation lever 63 is rotatably supported by a support member 77 via a bearing 78. 7
9 is a collar, and 80 is a bearing fixing nut. The support member 77 is attached to the head frame 29 (fifth
(Fig.) is fixed. The rotary lever 63 is rotatably driven by a cam lever 82 connected via a tie rod 81.

The chuck return rotation position 12' is constructed similarly to the chuck rotation device 12.

The regulating claw 14 of the chuck 9 is as shown in FIG.
It is attached to a chuck attachment shaft 26 so as to be movable in opening and closing around the support shaft 14a. A pawl opening/closing ring 95 is attached to the chuck mounting shaft 26 so as to be movable up and down, and its vertical movement opens a link mechanism (not shown).
The regulating pawl 14 is opened and closed through. The claw opening/closing ring 95 has a cam follower 96 and is guided by a fixed cam 103 for opening/closing the claw. The pawl opening/closing fixed cam 103 is formed on the fixed cam cylinder 3 on the outer periphery of the main shaft housing 30 (FIG. 5). The chuck mounting shaft 26 has a suction passage 89 that is open to the suction nozzle 13 inside.

Next, a method for mounting electronic components using the apparatus having the above configuration will be explained. Briefly, each chuck 9 mounted on the component mounting head 6 picks up an electronic component 8 from the component supply cassette 22 at a position _S1 with a suction nozzle 13, and mounts it on the circuit board 2 at a position _S6 . During this time, the electronic component 8 is centered with respect to the suction nozzle 13 using the regulating claw 14 on the chuck 9 side and the regulating claw 106 of the component position regulating device 10.
The component detection device 11 detects whether the electronic component 8 is attracted to the suction nozzle 13 in an appropriate posture. Furthermore, the chuck rotation device 12 rotates the chuck 9 to adjust the angle of the electronic component 8 to an arbitrary angle with respect to the circuit board 2. The chuck return rotation device 12' rotates the chuck 9 in the opposite direction by the angle θ rotated by the chuck rotation device 12.
Return to the origin angle.

The angle adjustment will be explained in detail. Chuck rotation position S ₅
After the component mounting head 6 has stopped, the rotation lever 63 of the chuck rotation device 12 is rotated to engage the chuck drive gear 36 with the chuck transmission gear 35 of the chuck attachment shaft 26, and the pulse motor 6 is rotated.
8 to rotate the chuck mounting shaft 26. Thereby, the angle of the electronic component 8 with respect to the circuit board 2 is regulated to an arbitrary angle. In addition, the chuck transmission gear 3
5 is normally locked by a rotation lock member 75, but when the rotation lever 63 rotates until the chuck drive gear 36 is engaged, the lock release dog 7
5' pushes the rotary lock member 75 to release the lock. By locking the rotation in this way, inadvertent rotation is prevented and an accurate rotation angle can be obtained.

The chuck drive gear 36 is driven by the pulse motor 68 under program control, and is controlled as follows. As shown in FIG. 9, consider the case where each electronic component 8 is sequentially mounted on the circuit board 2 at arbitrary angles θ ₁ , θ _{2 ,} . . . θ ₄ with respect to the reference direction. In this case, the chuck drive gear 36 meshes with the chuck transmission gear 35, rotates by an angle θ ₁ , and is separated from the chuck transmission gear 35. Then, without returning to the original angle, the chuck 9 is meshed with the chuck transmission gear 35 of the next chuck 9, and the chuck drive gear 36 is rotated by an angle θ ₂ . Therefore, the chuck drive gear 36 is at an angle of θ ₁ +θ ₂ with respect to the origin angle. In this way, the chuck drive gear 36
The angles θ ₁ , θ _{2 .} . . are rotated excessively by adding θ ₄ .

In this way, since the chuck drive gear 36 is rotated without returning to the original angle, the chuck transmission gear 36
The position of the chuck drive gear 36 when meshing with the chuck drive gear 36 differs sequentially. Therefore, the chuck drive gear 36
Local wear due to meshing impact is prevented.
Note that when the angles θ ₁ ... θ ₄ are zero, the chuck drive gear 36 does not rotate, so the meshing position does not change, but in this case, the rotation lever 63 is not rotated and the meshing is performed. Just check 9.
Let it pass. In addition, the chuck drive gear 36
The angle may be always added, or the angle may be returned to the origin angle every several rotations. This prevents the accumulation of errors and enables highly accurate angle adjustment.

In the above embodiment, the suction nozzle 13 is mounted on the rotating component mounting head 6, but the present invention
The present invention can also be applied to the case where the suction nozzle 13 is moved along an elliptical path or various other curved paths. Further, the present invention can be applied not only to the case where the electronic component 8 is mounted on the circuit board 2 but also to the case where the electronic component 8 is simply transported.

Effects of the Invention The method for adjusting the angle of an electronic component according to the present invention can adjust the angle to any angle without damaging the electronic component, and can also adjust the angle locally due to the meshing impact of the driving gear that engages and disengages from the gear on the chuck side. This has the effect of preventing severe wear.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a side view thereof.
FIG. 4 is a schematic plan view of the same, FIG. 5 is a partially omitted side view of the component mounting head, and FIG.
7 and 8 are respectively a plan view and a sectional view of the chuck rotating device, FIG. 9 is a partial plan view showing the circuit board and electronic components, and FIG. The figure is also an explanatory diagram of the method of controlling the chuck drive gear. DESCRIPTION OF SYMBOLS 1...Base, 2...Circuit board, 4...XY table, 5...Adhesive applicator, 6...Component mounting head, 8...Electronic component, 9...Chick, 10...
...Component position adjustment device, 12...Chuck rotation device, 12'...Chuck return rotation device, 13...
Suction nozzle, 14...Regulation claw, 26...Chuck mounting shaft, 35...Chuck transmission gear, 36...Chuck drive gear, 63...Rotation lever, 68...
pulse motor.

Claims (1)

[Claims] 1. An electronic component is held in a chuck and transported along a certain path, and at a stop position during transportation, a drive gear is removably engaged with a gear provided on the chuck, and the chuck is rotated by the drive of the drive gear to transport the electronic component. A method for adjusting the angle of electronic components, in which each electronic component is sequentially adjusted at an arbitrary angle θ ₁ , with respect to a reference direction.
θ ₂ , ... θn (n is an integer larger than 2) When rotating the driving gear, the angles θ 1 , θ 2 , θ ₁ , θ ₂ ,
...Angle added sequentially by θn (θ ₁ + θ ₂ , ...θ ₁ +
A method for adjusting the angle of an electronic component, characterized by rotating it to θ ₂ +...θn).