JPH09144911A - Air pressure changeover mechanism for adsorption nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To greatly increase the speed of an automatic electronic parts mounting apparatus equipped with an adsorption nozzle, and also certainly mount electronic parts on a printed-circuit board. SOLUTION: This mechanism is equipped with a first rod moving chamber 13 which is communicated with an air supply chamber 49 and also communicated with a positive pressure air supply line 58 through a positive pressure air supply opening 24, a second rod moving chamber 19 which is communicated with the air supply chamber 49 and also communicated with a negative pressure air supply line 57 through a negative pressure air supply opening 17, and valve rods 25, 26 which open/close the air supply opening by being respectively moved in the rod moving chamber 13, and which are connected to each other by a link member 28 having a rotary fulcrum 28a in its intermediate part. When one valve rod is moved so as to close the negative pressure air supply opening 17 or the positive pressure air supply opening 24, the other valve rod is moved in a direction oppose to the moving direction of the foregoing valve rod by the link member 28 so that the positive pressure air supply opening 24 or the negative pressure air supply opening 17 can be opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction nozzle air pressure switching mechanism. More specifically, the present invention relates to a technique for switching the air supplied to the inside of a suction nozzle to suck or release an electronic component or the like to increase the speed of an electronic component automatic mounting machine having a suction nozzle.

[0002]

2. Description of the Related Art Mounting of electronic parts on a printed circuit board is performed by an automatic machine, for example, an automatic electronic machine mounter for so-called surface mount type electronic parts. Some electronic devices are equipped with a suction nozzle that sucks and holds the electronic component supplied to the predetermined suction position by the electronic component supply device and mounts the electronic component on the printed circuit board.

In the electronic component automatic mounting machine as described above, in order to mass-produce printed circuit boards on which electronic components are mounted, there has been an increasing demand for high speed electronic component automatic mounting machines in recent years.

Usually, the suction nozzle is provided with an air supply chamber to which negative pressure air for sucking an electronic component is formed. The air supply chamber is located at a lower portion and has a tip for sucking the electronic component. It is in communication with the department.

The suction of the electronic component by the suction nozzle is performed by supplying negative pressure air from the air supply device to the nozzle portion through the air supply chamber. Then, the electronic component is mounted on the printed circuit board by shutting off the supply of negative pressure air when the suction nozzle moved above the printed circuit board is moved downward to place the electronic component on the printed circuit board. , And then the suction nozzle is moved upward.

[0006]

As described above, the electronic components are mounted on the printed circuit board by the suction nozzle by cutting off the supply of negative pressure air into the suction nozzle.

However, at the same time as the supply of the negative pressure air is cut off, the pressure inside the suction nozzle does not rise to the extent that the electronic parts can be separated, and it takes time from the supply of the negative pressure air to the separation of the electronic parts. Misalignment occurs.

Therefore, it is necessary to move the suction nozzle upwards after the pressure inside the suction nozzle has increased to a level at which the electronic components can be separated. It has been a hindrance to commercialization.

Further, from the viewpoint of increasing the speed of the automatic electronic component mounting machine, if the suction nozzle is set to move upward immediately after the supply of the negative pressure air is cut off, the electronic component can be detached inside the suction nozzle. The suction nozzle may move upward before the pressure rises. In this case, the electronic component moves upward together with the suction nozzle without being attached to the printed circuit board and is still sucked. The parts will not be properly mounted on the printed circuit board.

Therefore, the air pressure switching mechanism of the suction nozzle of the present invention overcomes the above-mentioned problems, speeds up the electronic component automatic mounting machine having the suction nozzle, and securely mounts the electronic components on the printed circuit board. The task is to be done.

[0011]

In order to solve the above problems, an air pressure switching mechanism of a suction nozzle of the present invention communicates with an air supply chamber and a positive pressure air supply line through a positive pressure air supply port. The first rod moving chamber, the second rod moving chamber that communicates with the air supply chamber and the negative pressure air supply line through the negative pressure air supply port, and the rod moving chamber that moves the air. When a valve rod is provided which is opened and closed and which is connected by a link member having a rotation fulcrum at an intermediate portion and one valve rod moves to close the negative pressure air supply port or the positive pressure air supply port. The link member causes the other valve rod to move in a direction opposite to the moving direction of the one valve rod to open the positive pressure air supply port or the negative pressure air supply port. Those were Unishi.

Therefore, according to the air pressure switching mechanism of the suction nozzle of the present invention, the pressure inside the suction nozzle is increased almost at the same time as the supply of the negative pressure air is cut off so that the electronic parts can be separated.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the air pressure switching mechanism of the suction nozzle of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

A rotary head 1 is provided in the automatic electronic component mounting machine. The rotary head 1 has a generally cylindrical outer fitting portion 2 which is long in the vertical direction, and a part of the outer fitting portion 2 is fitted internally. It has a shaft portion 3 that is long in the up-down direction and has a substantially cylindrical shape, and is supported by a support member (not shown) via the outer fitting portion 2 in a state in which the shaft portion 3 is inclined by about 25 ° with respect to the vertical direction.

The outer fitting portion 2 is formed with a substantially cylindrical projecting portion 2a projecting outward at a position near the lower end thereof and having a short vertical direction, and the side surface of the projecting portion 2a goes upward and the outer fitting portion 2 is formed.
The inclined surface 2b is directed toward the axis center of. The outer fitting portion 2 is rotatable about the axis with respect to the supporting member, and the shaft portion 3 is rotatable about the axis with respect to the outer fitting portion 2.

The shaft portion 3 is fitted inside the outer fitting portion 2 except for a quarter of the upper end side and the lower end portion, and a flange 3a protruding outward is provided at the lower end portion.

A head portion 4 is provided below the shaft portion 3, and the head portion 4 comprises a nozzle holding portion 5 and an air circuit connecting portion 6.

The nozzle holding portion 5 is formed by integrally forming a supported portion 7 having a substantially disk shape and a nozzle supporting portion 8 which is projected from the peripheral edge of the supported portion 7 in a slightly obliquely upward direction. Become.

The supported portion 7 is formed with a central hole 7a penetrating between the upper surface and the lower surface thereof, and the inner diameter of the central hole 7a is the same as that of the central hole 3b of the shaft portion 3. .

The nozzle support portion 8 has a thick portion 9 formed thicker at an outer portion thereof than a remaining portion thereof, and at a position of the thick portion 9 which is closer to the inner side of the baffle. Shallow recesses 9a, 9a, ... Opening to the upper surface are formed side by side at equal intervals in the circumferential direction.

The thick portion 9 is provided with nozzle support holes 10, 10, ... Opening in the center of the bottom surface of the recesses 9a, 9a ,. The support holes 10, 10, ... Are formed so as to penetrate the thick portion 9 and approach the central axis of the shaft portion 3 as going upward. The upper and lower ends of the nozzle support holes 10, 10, ... Are small-diameter portions 10a and 10b, respectively, and the remaining portions are large-diameter portions 10c.
The inner diameter of 0b is the same, and the inner diameter of the large diameter portion 10c is slightly larger than that of the small diameter portions 10a and 10b.

The thick-walled portion 9 of the nozzle support portion 8 has upper and lower through holes 11, 11, ... The insertion holes 12, 12, ... Are formed side by side at equal intervals in the circumferential direction (see FIGS. 3 and 4).

Each upper insertion hole 11 has, in order from the outer surface side of the thick portion 9, a first rod moving chamber 13 into which a valve rod described later is inserted, a small diameter portion 14, and a mounting hole 15 into which a connecting member described later is mounted. Has been done.

The inner diameters of the first rod moving chamber 13 and the mounting hole 15 are substantially the same, and the inner diameter of the small diameter portion 14 is slightly smaller than that of the first rod moving chamber 13. The first rod moving chamber 13 occupies approximately two-thirds of the length of the upper insertion hole 11, and the nozzle supporting hole 10 is formed in the portion of the first rod moving chamber 13 near the small diameter portion 14. An upper communication port 16 that communicates is formed. The connecting surface between the first rod moving chamber 13 and the small diameter portion 14 is a negative pressure air supply port 17 that serves as a negative pressure air supply port described later.

Each lower insertion hole has a cylinder 18 into which a piston described below is inserted and a second rod movement chamber 1 into which a valve rod described below is inserted in order from the outer surface side of the thick portion 9.
9, small-diameter portion 20, mounting hole 21 for mounting the connecting member
It has been.

The inner diameter of the second rod moving chamber 19 is the same as the first
Of the rod moving chamber 13 of the cylinder 18
Smaller than that of. The second rod moving chamber 19 and the mounting hole 21 have substantially the same inner diameter, and the small diameter portion 20 has an inner diameter slightly smaller than that of the second rod moving chamber 19. The cylinder 18 occupies approximately half the length of the lower insertion hole, and the second rod moving chamber 19 is shorter than the first rod moving chamber 13 by that amount.

The small diameter portion 20 of the second rod moving chamber 19
A lower communication port 22 that communicates the second rod moving chamber 19 and the nozzle support hole 10 is formed at a position directly below the upper communication port 16 in a portion located nearer. Immediately next to the lower communication port 22, a communication port 23 that connects the nozzle support hole 10 and the cylinder 18 is formed. The connecting surface between the second rod moving chamber 19 and the small diameter portion 20 is a positive pressure air supply port 24 that serves as a positive pressure air supply port described later.

The valve rod 25 has a substantially cylindrical shape corresponding to the shape and size of the first rod moving chamber 13, and its length is slightly longer than that of the first rod moving chamber 13. One end is a small-diameter portion 25a whose outer diameter is smaller than that of the remaining portion in correspondence with the inner diameter of the small-diameter portion 14. Then, the valve rod 25 is the first except for the end portion on the opposite side of the small diameter portion 25a (hereinafter, referred to as "outer end portion").
Is slidably inserted into the rod moving chamber 13.

The valve rod 26 is formed in the same shape and size as the valve rod 25, and an axially short piston 27 is externally fixed to the middle portion thereof. One end of the valve rod 26 corresponds to the inner diameter of the small-diameter portion 20 and is formed as a small-diameter portion 26a whose outer diameter is slightly smaller than the remaining portion. The valve rod 26 has a small diameter portion 26a.
The portion near the end is slidably inserted into the second rod movement chamber 19, and the intermediate portion is located inside the cylinder 18 together with the piston 27.

The valve rod 25 and the valve rod 26 are connected by a link member 28 between the ends located outside the insertion holes 11 and 12, that is, the outer ends. The center portion of the link member 28 is rotatably supported by a support portion (not shown) protruding outward from the outer surface of the thick portion 9, so that a rotation fulcrum 28a is formed here, and both end portions are formed. Is rotatable with respect to the valve rod 25 and the valve rod 26.

The inner end surface of the cylinder 18, that is, the inner surface 18a
A coil spring 29 is provided between the valve rod 26 and the piston 27 so as to fit onto the valve rod 26 in a natural length or in a state of being slightly contracted from the natural length.

The air circuit connecting portion 6 is located below the supported portion 7 of the nozzle holding portion 5, has an outer diameter slightly larger than that of the shaft portion 3, and is a substantially cylindrical shape short in the vertical direction. Is formed in. The air circuit connecting portion 6 is integrally formed with an upper portion 30 occupying a substantially upper half portion and a lower portion 31 occupying a lower portion thereof.

A through hole 32 extending vertically is formed in the center of the upper portion 30, and the through hole 32 has a large diameter portion 32a on the upper side and a small diameter portion 32b on the lower side. And
The inner diameter of the large diameter portion 32a is made slightly larger than that of the central hole 7a of the supported portion 7, and the inner diameter of the small diameter portion 32b is equal to the central hole 7a.
It is made smaller than that of a. Also, the upper part 30
Are formed in the side surface of the mounting recesses 33, 33, ...
3, ... Opened in the central portion of the back surface of the through hole 3
Communication holes 34, 34, ... Which communicate with the second large diameter portion 32a.
Are formed.

A concave portion 35 is formed in the lower side portion 31 and opens at the center of the upper surface thereof and has an inner diameter substantially the same as the inner diameter of the large diameter portion 32a of the through hole 32. Then, the mounting recesses 33, 3 formed in the upper portion 30 are provided in the lower portion 31.
Mounting recess 3 that opens to the side surface immediately below 3, ...
6 are formed, and the mounting recesses 36, 36,
Are formed with communication holes 37, 37, ... That communicate with the recesses 35, similarly to the mounting recesses 33, 33 ,.

Mounting recesses 33, 3 formed in the upper portion 30
, ... and mounting holes 15, 15, ... Formed in the thick portion 9 of the nozzle holding portion 5, respectively.
a, 38a, ... And 38b, 38b ,. The connection tubes 39, 39, ... Are provided between the connection members 38a, 38b at the corresponding positions.
-Connected by.

The mounting recess 3 formed in the lower portion 31
6, 36, ... and the mounting holes 21 formed in the thick portion 9,
21, ..., Connecting members 38c, 38c, ...
.. and 38d, 38d, ... Are attached, and the connecting members 38c, 38d at corresponding positions are connected by connecting tubes 40, 40 ,.

Through the central hole 3b of the shaft portion 3 through the central hole 7a of the nozzle holding portion 5, the through hole 32 of the air circuit connecting portion 6 is formed.
Up to this point, a cylindrical partition wall member 41 having an outer diameter substantially the same as the inner diameter of the small diameter portion 32b of the through hole 32 is inserted, and the lower end portion of the partition wall member 41 is inserted into the small diameter portion 32b of the through hole 32.
It is sealed by an oil seal. The air circuit connecting portion 6 is connected to the partition wall member 41 by the nozzle holding portion 5.
Also, it is rotatable with the shaft portion 3. Further, the upper end portion of the partition wall member 41 is projected upward from the shaft portion 3 so as to rotatably support the shaft portion 3 and to cover the upper end portion of the shaft portion 3 and the upper end portion of the partition wall member 41 from above. It is non-rotatably supported by a member (not shown).

Therefore, the shaft portion 3 is formed by the partition wall member 41.
Center hole 3b and the center hole 7 of the supported portion 7 of the nozzle holding portion 5
In the a and the large diameter portion 32a of the through hole 32 of the air circuit connecting portion 6, separate vacant chambers are formed inside and outside the partition member 41, respectively, and the vacant chambers formed on the outside are sequentially outside from the upper side. The vacant chambers 3c, 5a and 6a are provided.

The suction nozzles 42, 42, ... Are formed in a substantially columnar shape that is long in the vertical direction, and the thick wall portion 9 of the nozzle holding portion 5 is formed.
Are supported by the nozzle support holes 10, 10 ,.

Each of the suction nozzles 42, 42, ... Has a slide portion 43, an outer fitting cylinder portion 44, a light receiving portion 45, and a nozzle portion 46 (see FIG. 2).

The slide part 43 comprises a pressed part 47 and an air supply part 48 located below the pressed part 47.

The pressed portion 47 has a substantially columnar shape that is long in the vertical direction, and has a flange 47a protruding outward at the upper end thereof.
Is formed, and slide pins 47b projecting from surfaces 180 ° apart from each other are provided at positions near the lower end.

The air supply portion 48 has a substantially cylindrical shape having a length approximately twice that of the pressed portion 47, and its outer diameter is slightly larger than that of the pressed portion 47 and is formed in the thick portion 9. The inner diameter of the small diameter portion 10a of the nozzle support hole 10 is set to be substantially the same. Further, a fitting insertion hole 48a that opens to the upper surface is formed at the upper end of the air supply portion 48.

A hole 48b penetrating between the surfaces passing through the shaft center and separated by 180 ° is formed in a substantially central portion in the vertical direction of the air supply portion 48, and a lower half portion is formed from the central portion of the hole 48b. A hole 48c that extends downward and opens to the lower surface is formed. The holes 48b and 48c serve as an air supply chamber 49 to which positive pressure air or negative pressure air is supplied. In addition, the air supply units 48 are arranged near each other at the upper end side.
Insertion holes 48d, 48d, which communicate with the insertion insertion hole 48a and are elongated in the vertical direction, are formed at positions separated by 0 °.

The lower end of the pressed portion 47 is slidably fitted in the fitting insertion hole 48a of the air supply portion 48, and both ends of the slide pin 47b are projected from the insertion holes 48d, 48d. Has been done. Further, the first spring 50 is contracted between the lower surface of the pressed portion 47 and the bottom surface of the fitting insertion hole 48a, and the repulsive force of the first spring 50 causes the pressed portion 47 to move upward. The slide pin 47b is urged so that the inner portions of both ends of the slide pin 47b are in contact with the upper ends of the insertion holes 48d and 48d.

The outer fitting cylindrical portion 44 has a substantially cylindrical shape which is long in the vertical direction, and has a length which is substantially half the length of the air supply portion 48. At the position on the slightly lower side of the central portion of the outer fitting tubular portion 44, a protruding portion 44a whose diameter gradually increases as it goes downward.
Are formed. Further, slide holes 44c, 44c communicating with the central hole 44b and long in the vertical direction are formed at positions apart from each other by 180 ° except the upper and lower end portions. Further, a ring 44d made of hard rubber is attached to the upper end portion in an externally fitted shape. The inner diameter of the center hole 44b of the outer fitting cylinder portion 44 is substantially the same as the outer diameter of the air supply portion 48.

Therefore, the outer fitting cylinder portion 44 is fitted around the upper half of the air supply portion 48, and the outer fitting cylinder portion 44 and the air supply portion 48 are slidable with respect to each other. Further, by fitting the outer fitting cylinder portion 44 onto the substantially upper half portion of the air supply portion 48, a lower approximately one-quarter part of the pressed portion 47 is positioned inside the outer fitting cylinder portion 44, Both ends of the slide pin 47b are located in the slide hole 44c.

A second spring 51 is externally fitted to the pressed portion 47 between the lower surface of the flange 47a of the pressed portion 47 and the upper surface of the outer fitting cylindrical portion 44. And the second spring 5
The repulsive force of 1 urges an upward moving force to the pressed portion 47, and both ends of the slide pin 47b are brought into contact with the upper ends of the slide holes 44c and 44c. The second spring 51
Has a weaker spring force than the first spring 50.

Of the substantially lower half portion of the air supply portion 48 of the slide portion 43, the portion except the lower end portion is slidably inserted into the nozzle support hole 10 of the thick portion 9. As a result, the lower end portion of the air supply portion 48 projects downward from the nozzle support hole 10, and the pressed portion 47 of the slide portion 43, the substantially upper half portion of the air supply portion 48, and the outer fitting cylinder portion 44 are attached to the nozzle support hole 10. Is located above.

On the outer edge of the bottom surface of the concave portion 9a of the thick portion 9, a vertically short, substantially cylindrical sealing member 52 is placed in a state of being fitted onto the lower end portion of the fitting tube portion 44, and the sealing member is placed. 52
A third spring 53 is provided on the outer fitting cylinder portion 44 so as to be fitted between the upper surface of the outer fitting cylinder portion 44 and the lower surface of the protruding portion 44 a of the outer fitting cylinder portion 44. The spring force of the third spring 53 is stronger than the first spring force.

The nozzle portion 46 has a substantially cylindrical shape with a diameter smaller than that of the air supply portion 48, and has a flange 46a protruding outward at a position near the upper end. The upper surface of the light receiving portion 45 made of a transparent material has a flange 46.
It is externally fitted to the intermediate portion of the nozzle portion 46 while being in contact with the lower surface of a.

The upper end of the nozzle portion 46 is attached to the lower end of the air supply portion 48 so that the inside of the nozzle portion 46 and the air supply chamber 49 are communicated with each other.

As described above, the nozzle support holes 10, 1
Since 0, ... are formed so as to approach the central axis of the shaft portion 3 as going upward, the suction nozzles 42, 42 ,. It is made to approach the axis. Therefore, the external fitting tubular portion 44
The outer surface of the ring 44c attached to the upper end of the outer peripheral portion is brought into contact with the inclined surface 2b of the protruding portion 2a of the outer fitting portion 2 (see FIG. 1),
The suction nozzle 42 is rotated around the axis by the rotation of the outer fitting portion 2.

Further, as described above, the shaft portion 3 is inclined by about 25 ° with respect to the vertical direction, and the nozzle holding portion 5 is configured such that the nozzle supporting portion 8 projects from the supported portion 7 obliquely upward. Therefore, as shown in FIG. 1, the suction nozzles 42, 42, ... Supported by the nozzle support holes 10, 10 ,. The suction nozzle 42 faces the vertical direction only when it is located at the lowermost end during the rotation of the suction nozzle 42 (the suction nozzle 42 located on the right side of FIG. 1). And this position is the suction nozzles 42, 4
2 and so on are the suction position and the mounting position when sucking an electronic component described later or mounting the electronic component on the printed circuit board.

Outside the thick portion 9 at the suction position (mounting position), a support column 54 is located close to the outer surface of the thick portion 9, and the support column 54 has a suction nozzle described later. Four
An upper side pusher 55 and a lower side pusher 56, which press the outer end surface of the valve rod 25 or the valve rod 26 when the electronic parts are detached or sucked by 2, 42, ... The support column 54 is provided on the support member (not shown), and is moved while maintaining the positional relationship with the rotary head 1 as the rotary head 1 described later moves.

Therefore, when the electronic component is sucked or the sucked electronic component is mounted on the printed circuit board, the nozzle portion 46 of the suction nozzle 42 is moved up and down together with the slide portion 43.

The downward movement of the nozzle portion 46 is caused by the pressed portion 4
The upper end of 7 is pressed downward by a pressing member (not shown) located above the pressed portion 47.
That is, when the pressed portion 47 is pressed by the pressing member, the second spring 51 having the weakest spring force among the first to third springs 50, 51, 53 is compressed to be pressed. The portion 47 is moved downward with respect to the outer fitting portion 44,
The pushed portion 47 pushes downward the first spring 50 located in the fitting insertion hole 48a of the air supply portion 48, and the air supply portion 48, the light receiving portion 45, and the nozzle portion 46 are integrated with the pushed portion 47. Move downwards. At this time, slide pin 4
Both ends of 7b have slide holes 44c, 4
It is guided by 4c and moves downward.

The first spring 50 plays a role as a cushion for weakening the impact applied to the electronic component when the nozzle portion 46 is moved downward and its tip end surface abuts on the electronic component. That is, even if the pressed portion 47 is further pressed by the pressing member when the tip end surface of the nozzle portion 46 contacts the electronic component, the first spring 50 is compressed and only the pressed portion 47 is the first spring 50. Is moved downward by the compression amount of
The nozzle portion 46 and the air supply portion 48 do not move downward any further.

The upward movement of the nozzle portion 46 is performed by releasing the pressing of the pressed member against the pressed portion 47 and returning the compressed second spring 51 to the original state. That is, when the pressing force of the pressing member is released, the pressed portion 4 is pressed by the repulsive force of the compressed second spring 51.
7 is moved upward and both ends of the slide pin 47b are in contact with the upper ends of the insertion holes 48d and 48d of the air supply part 48, so that the air supply part 48, the light receiving part 45 and the nozzle part 46 are pressed by the pressed part 47. Together with it, it is moved upward.

When the suction nozzle 42 is moved downward to suck an electronic component, negative pressure air is supplied into the suction nozzle 42 from a negative pressure air supply device (not shown). That is, the negative pressure air is supplied to the negative pressure air supply device-the outer chamber 3c of the shaft portion 3, the outer chamber 5a of the nozzle holding portion 5, the outer chamber 6a of the upper portion 30 of the air circuit connecting portion 6-the upper portion 30. Communication hole 34-connection tube 39-small diameter portion 14 of upper insertion hole 11 of nozzle holding portion 5 from negative pressure air supply port 17 to upper communication port 16 and large diameter portion 10c of nozzle support hole 10. Air supply chamber 49 of the suction nozzle 42
Supplied within. The negative pressure air supply line 57 extends from the negative pressure air supply device to the negative pressure air supply port 17 in the above path.

When the electronic components are not sucked, the suction nozzle 4 is moved from the positive pressure air supply device (not shown).
Positive pressure air is supplied to the inside of 2. That is, positive pressure air is
Positive pressure air supply device-Inside the partition member 41-Recess 35 of the lower part 31 of the air circuit connecting part 6-Communication hole 37 of the lower part 31
-Connecting tube 40-Lower insertion hole 12 of nozzle holding part 5
Positive pressure air supply port 24 through the small diameter part 20
To the lower communication port 22 and the large diameter portion 10 of the nozzle support hole 10.
It is supplied into the air supply chamber 49 of the suction nozzle 42 via c. A positive pressure air supply line 58 extends from the positive pressure air supply device to the positive pressure air supply port 24 in the above path. Further, the positive pressure air supplied is the nozzle support hole 1
0 is also supplied to the inside of the cylinder 18 through the communication port 23 that connects the cylinder 18 to each other.

The operation of the air pressure switching mechanism of the suction nozzle of the present invention will be described below with reference to FIGS.

3 and 4, a cross section of the thick portion 9 cut at the position of the upper insertion hole 11 is shown on the upper side, and a thick section cut at the position of the lower insertion hole 12 is shown on the lower side. The cross section of the portion 9 is shown, and the link member 28 is shown in a state in which the valve rods 25 and 26 are connected for convenience of description. Further, the positive pressure air is indicated by Δ, and the negative pressure air is indicated by a pear character.

The rotary head 1 is moved above the component supply position of the electronic component supply device (not shown).

The shaft portion 3 is rotated with respect to the support member (not shown), and the head portion 4 rotates integrally with the shaft portion 3 as the shaft portion 3 rotates, so that one suction nozzle 42 moves to the suction position. Is located in. In the state where the suction nozzle 42 is not sucking the electronic component, as described above, the suction nozzle 4
2, positive pressure air is supplied, and as shown in FIG. 3, the valve rod 25 has its small diameter portion 25a sucked by negative pressure air to close the negative pressure air supply port 17, and the valve rod 26 is The small diameter portion 26a is pressed by the positive pressure air so that the positive pressure air supply port 24 and the lower communication port 22 are opened.

In the suction nozzles 42, 42, ... In which the electronic parts are not sucked, however, the valve rods 26, 26 ,.
... is open, so each air supply chamber 49, 4
9 are connected to each other via a positive pressure air supply line 58. Since the upper communication ports 16, 16, ... Are closed by the valve rods 25, 25, ..., The air supply chambers 49, 49 ,. Are not in communication.

The positive pressure air and the negative pressure air are supplied to the positive pressure air supply line 58 or the negative pressure air during the operation of the rotary head 1 regardless of whether the suction nozzles 42, 42, ... It is supplied to the supply line 57.

The outer end surface of the valve rod 26 is pressed by the lower pusher 56 provided on the support column 54 located close to the outer surface of the thick portion 9. Then, the valve rod 26 located at the position where the positive pressure air supply port 24 and the lower communication port 22 are opened is moved to the positive pressure air supply port 24 side so that the positive pressure air supply port 24 and the lower communication port 22 are separated from each other. Is blocked. In addition, a piston 27 provided on the valve rod 26
Is moved with the movement of the valve rod 26, and the coil spring 29 is compressed (see FIG. 4).

On the other hand, the valve rod 25 which has closed the negative pressure air supply port 17 and the upper communication port 16 has the link member 2
8, the valve rod 26 is moved in the direction opposite to the moving direction, and the negative pressure air supply port 17 and the upper communication port 16 are opened (see FIG. 4).

As a result, the supply of the positive pressure air supplied to the suction nozzle 42 is cut off, and the negative pressure air is supplied from the negative pressure air supply port 17 to the suction nozzle 42 through the upper communication port 16. It

When negative pressure air is supplied into the suction nozzle 42, the upper end of the pressed portion 47 of the suction nozzle 42 is pressed by the pressing member as described above, and the nozzle portion 46 is moved downward. Then, the electronic component at the component supply position of the electronic component supply device is sucked by the tip surface of the nozzle portion 46.

When the electronic parts are adsorbed, the lower pusher 5
The pressing of the valve rod 26 by 6 is released.

Then, when the electronic parts are adsorbed to the nozzle part 46, the inside of the nozzle part 46 and the air supply chamber 4 are
A cylinder 18 communicating with the inside of the air supply chamber 9 and the air supply chamber 49.
The inside is sealed and reaches a predetermined negative pressure. Therefore, even if the pressing of the valve rod 26 by the lower pusher 56 is released, the suction force of the negative pressure air to the piston 27 overcomes the spring force of the coil spring 29, and the piston 27 compresses the coil spring 29. 4 is maintained, the positive pressure air supply port 24 is closed, and the negative pressure air supply port 17 is closed.
Is kept open.

When negative pressure air is supplied to the suction nozzle 42, the small diameter portion 25a of the valve rod 25 is also sucked by the negative pressure air, but the cylinder 18 is more negatively pressured than the valve rod 25. The area in contact with the air is large, the moving force of the valve rod 25 toward the positive pressure air supply port 24 side of the cylinder 18 is larger than the moving force toward the negative pressure air supply port 17 side, and the repulsive force of the coil spring 29. The size of the cylinder 18 is determined so that the moving force of the cylinder 18 toward the positive pressure air supply port 24 side is larger than the total moving force of the valve rod 25 toward the negative pressure air supply port 17 side. The valve rod 25 is the negative pressure air supply port 17
There is no such thing as moving to the side.

In the suction nozzles 42, 42, ... In which the electronic components are sucked, the valve rods 25, 25 ,.
.. are open, so each air supply chamber 49, 4
9 are connected to each other via the negative pressure air supply line 57. Since the lower communication ports 22, 22, ... Are closed by the valve rods 26, 26, ..., The air supply chambers 49, 49 ,. Are not in communication.

By the way, when the electronic component is not adsorbed to the nozzle portion 46 due to an adsorption error, or when the electronic component is not properly adsorbed, for example, the electronic component is attached to the adsorption port formed on the tip surface of the nozzle portion 46. If the suction is carried out without being completely blocked, the inside of the suction nozzle 42 or the like may not reach the predetermined negative pressure, and the positive pressure air supply port 24 may not be completely blocked. Then, as described above, the suction nozzle 42,
, 42 are connected to each other via a negative pressure air supply line 57,
The pressure inside the other suction nozzles 42, 42, ..., Which have already sucked the electronic component and have reached a predetermined negative pressure, increases, and the electronic component has a nozzle portion 46 of the suction nozzle 42, 42 ,. , 46, ... may be detached.

In the air pressure switching mechanism of the suction nozzle of the present invention, when the suction failure of the electronic component occurs and the inside of the air supply chamber 49 does not reach a predetermined negative pressure, the repulsive force of the coil spring 29 causes the piston 27 to move. It is designed to overcome the suction force of the negative pressure air to the positive pressure air supply port 24 because the coil spring 29 tries to return to the original state.
Moved away from. And the piston 27
At the same time, the valve rod 26 is moved to open the positive pressure air supply port 24 and the lower communication port 22, and at the same time, the valve rod 25 is moved in the direction opposite to the moving direction of the valve rod 26 to close the negative pressure air supply port 17. To be done. As a result, the air supply chamber 49 of the suction nozzle 42 in which the suction error has occurred and the air supply chamber 49 of the other suction nozzles 42, 42, ...
The communication with the suction nozzles 49, ... Through the negative pressure air supply line 57 is blocked, so that the other suction nozzles 42, 42 ,.
The pressure inside the air supply chambers 49, 49, ... Does not increase, and the electronic components that have already been sucked are separated from the suction nozzles 42, 42 ,. There is no such thing.

When the one suction nozzle 42 sucks the electronic component, the pressing of the upper end of the suction nozzle 42 by the pressing member is released, and the repulsive force of the compressed second spring 51 causes the pressing member 47 to move together. The nozzle portion 46 is moved upward. Then, the shaft portion 3 rotates by a predetermined angle and the suction nozzle 42 located next to the one suction nozzle 42 is positioned at the suction position. Then, similarly to the above, the suction nozzle 42 is moved downward to suck the electronic component, and then moved upward.

When all the suction nozzles 42, 42, ... Have sucked the electronic components, the rotary head 1 is moved above the component pick-up position on the printed circuit board. Then, as described above, the support column 54 is moved with the movement of the rotary head 1 while maintaining the positional relationship with the rotary head 1.

The upper end portion of the pressed portion 47 of the one suction nozzle 42 located at the mounting position is pressed by the pressing member, and the nozzle portion 46 is moved downward. Suction nozzle 42
Is moved downward and an electronic component is brought into contact with the printed circuit board, the outer end surface of the valve rod 25 is pressed by the upper pusher 55 provided on the support column 54.

Then, the valve rod 25 located at the position where the negative pressure air supply port 17 and the upper communication port 16 are opened.
Moves to the negative pressure air supply port 17 side and closes the negative pressure air supply port 17 and the upper communication port 16 (see FIG. 3).

On the other hand, the valve rod 26, which has closed the positive pressure air supply port 24 and the lower communication port 22, has the link member 2
8 moves the valve rod 25 in the direction opposite to the moving direction, and the positive pressure air supply port 24 and the lower communication port 22 are opened. In addition, the piston 2 provided on the valve rod 26
7 moves with the movement of the valve rod 26 and the compressed coil spring 29 returns to its original state (see FIG. 3).

As a result, the supply of the negative pressure air supplied to the suction nozzle 42 is cut off, and the positive pressure air is supplied to the suction nozzle 42 from the positive pressure air supply port 24 through the lower communication port 22. To be done.

When positive pressure air is supplied into the suction nozzle 42, the electronic component is detached from the nozzle portion 46 and the electronic component is mounted on the printed circuit board.

In the suction nozzle air pressure switching mechanism of the present invention, since positive pressure air is supplied at the same time as the supply of negative pressure air is interrupted, the inside of the suction nozzle 42 is interrupted at substantially the same time as the supply of negative pressure air is interrupted. Since the pressure is increased to the extent that the electronic component can be separated, there is almost no time lag between the interruption of the supply of negative pressure air and the separation of the electronic component.

Therefore, the speed of the electronic component automatic mounting machine can be increased as compared with the conventional electronic component automatic mounting machine in which there is a time lag between the supply of the negative pressure air and the separation of the electronic components. I can.

Further, since the electronic parts are detached from the suction nozzle 42 and mounted on the printed circuit board at substantially the same time as the supply of the negative pressure air is interrupted, the upward movement of the nozzle portion 46 is interrupted by the supply of the negative pressure air. The electronic components can be set to be performed substantially at the same time, and the electronic component is not mounted on the printed circuit board and is not moved upward together with the suction nozzle 42 while being suctioned.

Therefore, the electronic components can be reliably mounted on the printed circuit board.

When the electronic component is mounted on the printed circuit board, the pressing of the pressed portion 47 by the pressing member is released, and the pressed portion 47 is pressed by the repulsive force of the compressed second spring 51.
At the same time, the nozzle portion 46 is moved upward and returns to its original position.

Further, although the pressing of the upper pusher 55 to the valve rod 25 is also released, even if the pressing of the upper pusher 55 is released, the valve rod 25 is moved to the position for closing the negative pressure air supply port 17. Is sucked by negative pressure air, and the piston 27 and valve rod 2
6 is pressed by the positive pressure air while being moved to a position where the positive pressure air supply port 24 is opened, and the piston 27 is biased by the coil spring 29 in the direction to open the positive pressure air supply port 24. Therefore, the state where the negative pressure air supply port 17 is closed and the positive pressure air supply port 24 is opened is maintained.

Therefore, in the suction nozzles 42, 42, ... Where the electronic components are not suctioned, the valve rod 2
5, 25, ... by negative pressure air supply ports 17, 17,
Since the ... Is closed, the other suction nozzles 42, 42, which have already sucked the electronic component and are kept at a predetermined negative pressure,
The pressure inside the air supply chambers 49, 49, ... Is not affected.

When the one suction nozzle 42 mounts an electronic component on the printed circuit board, the shaft portion 3 rotates by a predetermined angle and the suction nozzle 42 located next to the one suction nozzle 42 is positioned at the mounting position. It Then, in the same manner as above, the suction nozzle 42 is moved downward to mount the electronic component on the printed circuit board, and then moved upward.

When the electronic components of all the suction nozzles 42, 42, ... Are mounted on the printed circuit board, the rotary head 1 is again positioned above the component supply position of the electronic component supply device.
Is moved. Then, the suction nozzles 42, 42, ...
The electronic components are sucked by the above method, then the sucked electronic components are mounted on the printed circuit board, and these suction and mounting are repeated.

[0094]

As is apparent from the above description, in the air pressure switching mechanism of the suction nozzle of the present invention, the air supply chamber to which air is supplied is formed, and the negative pressure air supply line is provided in the air supply chamber. Negative pressure air is supplied through the device to adsorb electronic components and the like, and positive pressure air is supplied to the air supply chamber through the positive pressure air supply line to separate the adsorbed electronic components and the like. A nozzle air pressure switching mechanism, which communicates with the air supply chamber and a first rod moving chamber that communicates with the air supply chamber and also communicates with the positive pressure air supply line through a positive pressure air supply port. A second rod moving chamber that communicates with the negative pressure air supply line through the negative pressure air supply port and a second rod movement chamber that moves in the rod movement chamber to open and close the air supply port are also used. A valve rod connected by a link member having a rotation fulcrum is provided in an intermediate portion, and when one valve rod moves to close the negative pressure air supply port or the positive pressure air supply port, the other link member is used by the link member. The valve rod is moved in the direction opposite to the moving direction of the one valve rod to open the positive pressure air supply port or the negative pressure air supply port.

Therefore, in the suction nozzle air pressure switching mechanism of the present invention, since positive pressure air is supplied at the same time as the supply of negative pressure air is interrupted, the inside of the suction nozzle is interrupted at substantially the same time as the supply of negative pressure air is interrupted. Since the pressure is increased to the extent that the electronic components can be separated, there is almost no time lag between the interruption of the supply of negative pressure air and the separation of the electronic components.

Therefore, the speed of the electronic component automatic mounting machine can be increased as compared with the conventional electronic component automatic mounting machine in which there is a time lag between the supply of the negative pressure air and the separation of the electronic components. I can.

Further, since the electronic component is detached from the suction nozzle and mounted on the printed circuit board at about the same time as the supply of the negative pressure air is cut off, the upward movement of the nozzle portion is made at about the same time as the supply of the negative pressure air is cut off. It can be set so that the electronic component does not move to the upper side together with the suction nozzle while being suctioned without being mounted on the printed circuit board.

Therefore, the electronic components can be reliably mounted on the printed circuit board.

The shapes and structures of the respective portions shown in the above-mentioned embodiments are merely examples of the embodiment when the present invention is carried out, and the technical scope of the present invention can be realized by these. Should not be interpreted in a limited way.

[Brief description of the drawings]

FIG. 1 shows an embodiment of an air pressure switching mechanism of a suction nozzle of the present invention together with FIGS. 2 to 4, and this figure is a vertical cross-sectional view showing a main part of a rotary head.

FIG. 2 is an enlarged vertical sectional view showing a suction nozzle and an air pressure switching mechanism.

FIG. 3 is a view for explaining the operation of the air pressure switching mechanism together with FIG. 4, and this drawing is an enlarged sectional view showing a state in which the negative pressure air supply port is closed and the positive pressure air supply port is opened. is there.

FIG. 4 is an enlarged cross-sectional view showing a state where the negative pressure air supply port is opened and the positive pressure air supply port is closed.

[Explanation of symbols]

 13 First Rod Movement Chamber 17 Negative Pressure Air Supply Port 18 Cylinder 18a Inner End Surface 19 Second Rod Movement Chamber 24 Positive Pressure Air Supply Port 25 Valve Rod 26 Valve Rod 27 Piston 28 Link Member 28a Rotation Support Point 29 Coil Spring 42 Adsorption nozzle 49 Air supply chamber 57 Negative pressure air supply line 58 Positive pressure air supply line

Claims (3)

[Claims] 1. An air supply chamber to which air is supplied is formed, and negative pressure air is supplied to the air supply chamber through a negative pressure air supply line to adsorb electronic components and the like to the air supply chamber. An air pressure switching mechanism of an adsorption nozzle in an adsorption nozzle that releases positively-charged air through a positive-pressure air supply line to remove the adsorbed electronic components and the like, and communicates with the air supply chamber and supplies positive-pressure air. A first rod moving chamber communicating with the positive pressure air supply line through a port, and a second rod communicating with the air supply chamber and communicating with the negative pressure air supply line through a negative pressure air supply port A moving chamber and a valve rod that moves in the rod moving chamber to open and close the air supply port and are connected to each other by a link member having a rotation fulcrum at an intermediate portion are provided. When one of the valve rods moves to close the negative pressure air supply port or the positive pressure air supply port, the other valve rod is moved by the link member in the direction opposite to the moving direction of the one valve rod. An air pressure switching mechanism for a suction nozzle, wherein the positive pressure air supply port or the negative pressure air supply port is opened. 2. A cylinder, which is connected to the first rod moving chamber and communicates with the air supply chamber and one of which is open, and a piston which moves integrally with the valve rod in the cylinder are provided. When the negative pressure air supply port is opened and the air supply chamber reaches a predetermined negative pressure, the piston moved toward the air supply chamber is maintained in that state due to the pressure difference between the atmospheric pressure and the predetermined negative pressure. 2. The positive pressure air supply port is maintained in a closed state.
An air pressure switching mechanism of the suction nozzle according to. 3. A coil spring is arranged between the inner end surface of the cylinder and the piston in a direction along the moving direction of the piston, and a predetermined negative pressure is maintained in the air supply chamber even if the negative pressure air supply port is opened. When it does not reach, the piston moves due to the expansion of the coil spring compressed by the movement of the piston to open the positive pressure air supply port and close the negative pressure air supply port. The air pressure switching mechanism of the suction nozzle according to claim 2.