JPH08316696A - Component suction nozzle for mounting machine - Google Patents

Abstract

PURPOSE: To effectively and suitably conduct the suction of a small-sized chip component by aligning three suction holes of a substantially circuit shape communicating with a passage in one row at the end of a shaft formed with the passage communicating with a negative pressure supply source therein and opening the holes. CONSTITUTION: A negative pressure passage 28 communicating with load supply means via a nozzle shaft 23 and a nozzle holding member 24 is formed in a shaft for constituting a nozzle 27, and communicates with the exterior via suction holes 30 formed in the nozzle tip 29. The holes 30 include a hole 30b formed at the center of the nozzle and holes 30a, 30c formed at an equal interval in one lateral row at the hole 30b as a center of total three holes. At the time of mounting, negative pressure guided to the nozzle tip 29 via the passage 28 is operated at a component via the holes 30a to 30b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting machine constructed so that a component suction nozzle mounted on a movable head unit picks up a component from a component supply section and mounts it on a printed circuit board. The present invention relates to a component suction nozzle of a mounting machine for mounting the above component.

[0002]

2. Description of the Related Art Conventionally, a movable head unit is provided with a nozzle member for adsorbing a component so as to be able to move up and down and rotate, and the nozzle member is used to adsorb a component from a component supply portion and mount it on a printed circuit board that is positioned. A mounting machine configured to do so is known.

In such a mounting machine, for example, the nozzle member is composed of a hollow nozzle shaft and a nozzle (component suction nozzle) which is removably mounted on the lower end of the nozzle shaft. Negative pressure is introduced from the negative pressure supply source into the nozzle shaft and acts on the tip of the nozzle to attract components.

The suction hole of the nozzle is a single hole, and the shape thereof is generally formed in a circular shape. Many so-called chip parts such as capacitors and resistors use a nozzle having such a circular suction hole. It is designed to be implemented using

[0005]

By the way, in the nozzle having the circular suction hole as described above, it is necessary to make the suction hole small in order to prevent the suction failure due to the air leak as the parts to be sucked are miniaturized. Therefore, it becomes difficult to sufficiently apply a negative pressure to the component.

Therefore, for example, for a rectangular component having a predetermined size or less, a suction nozzle having a rectangular nozzle with a size appropriately smaller than the component surface is used so that negative pressure acts on a wide range of the component surface. It has been adopted to mount components.

However, in the above-mentioned nozzle having a rectangular suction hole, the long side of the suction hole of the nozzle is relatively large.
If the component is displaced from the nozzle position at the component supply position, an air leak will occur or a standing suction phenomenon will occur, that is, negative pressure will act on the corner of the component and the corner of the component will fit into the suction hole. In some cases, the component may not be adsorbed properly due to the phenomenon that the component is adsorbed.

Therefore, there is a demand for a nozzle structure capable of sucking a component with a sufficient suction force while preventing the occurrence of such a suction defect when mounting a small component. In particular,
In recent years, electronic components have become smaller, and for example, 1 mm × 0.
It is required to mount a 5 mm rectangular ultra-small chip component, and it is desired to improve the suction failure with respect to the above-described small component.

The present invention has been made to solve the above problems, and more reliably attracts small chip components,
Moreover, it is an object of the present invention to provide a component suction nozzle of a mounting machine that can be appropriately performed.

[0010]

A component suction nozzle of a mounting machine according to claim 1 is provided in a head unit which is movable between a component supply side and a component mounting side of a mounting machine for sucking a rectangular component. In the component suction nozzle, three substantially circular suction holes communicating with the passage are bored in a row at the tip of a shaft body having a passage formed therein, the passage communicating with a negative pressure source. .

A component suction nozzle of a mounting machine according to a second aspect is the component suction nozzle according to the first aspect, wherein the diameter of each of the suction holes is formed to be about 3/5 of the short piece size of the component. It will be.

[0012]

When a component is picked up by the mounting machine equipped with the component suction nozzle of the present invention, the middle suction hole of the suction holes formed at the tip of the nozzle substantially coincides with the center of the component, and The nozzles are arranged with respect to the parts such that the arrangement direction and the longitudinal direction of the parts are substantially coincident. In this state, negative pressure acts on the parts through the suction holes to cause the parts to be adsorbed by the nozzle members. Be seen.

According to this component suction nozzle structure, even if a sufficient opening area is secured for the entire suction holes in order to enhance the suction force of the components, the opening area for each suction hole is relatively large with respect to the components. Since the size is small, it is possible to properly adsorb the components without causing a component adsorption failure such as standing suction. Moreover, when a suction deviation around the nozzle axis occurs in the component, a negative pressure acts on both end portions in the longitudinal direction of the component via the suction holes at both ends, and the suction deviation is corrected.

In particular, if the diameter of each suction hole of the nozzle is set to about 3/5 of the short piece size of the component, it becomes possible to secure a sufficient suction force for the component.

[0015]

Embodiments of the present invention will be described with reference to the drawings.

1 and 2 schematically show the entire mounting machine to which the present invention is applied. As shown in the figure, on the base 1 of the mounting machine, a conveyor 2 for carrying a printed circuit board is installed.
The printed circuit board 3 is conveyed on the conveyor 2 and stopped at a predetermined mounting work position.

A head unit 5 for mounting components is mounted above the base 1. This head unit 5
Is movable across the component supply unit 4 and the component mounting unit where the printed circuit board 3 is located. In this embodiment, the X-axis direction (direction of the conveyor 2) and the Y-axis direction (direction orthogonal to the X-axis on a horizontal plane). ) Can be moved to.

That is, a fixed rail 7 in the Y-axis direction and a ball screw shaft 8 rotatably driven by a Y-axis servomotor 9 are arranged on the base 1, and the head unit is mounted on the fixed rail 7. A support member 11 is arranged, and a nut portion 12 provided on the support member 11 is screwed onto the ball screw shaft 8. In addition, the support member 11 has an X
A guide member 13 in the axial direction and a ball screw shaft 14 driven by an X-axis servomotor 15 are arranged, and a head unit (a component mounting head) 5 is movably held by the guide member 13, and this head is provided. A nut portion (not shown) provided on the unit 5 is screwed onto the ball screw shaft 14. The operation of the Y-axis servomotor 9 moves the support member 11 in the Y-axis direction, and the operation of the X-axis servomotor 15 causes the head unit 5 to move in the X-axis direction with respect to the support member 11. ing.

The head unit 5 is provided with a nozzle member for sucking a component, and in the illustrated example, two nozzle members 21 and 22 are provided.

The nozzle members 21 and 22 have the same basic structure. For example, as shown in FIG.
3, a nozzle holding member 24 attached to the nozzle holding member 3, and a nozzle 27 detachably attached to the nozzle holding member 24.

The nozzle shaft 23 of each nozzle member 21, 22 is attached to the frame of the head unit 5 so as to be movable in the Z-axis direction (vertical direction) and rotatable about the R-axis (nozzle central axis). The Z-axis servomotors 17 and 18 and the R-axis servomotors 19 and 20 are connected to the elevating mechanism and the rotating mechanism and operated. Further, the nozzle shaft 23 of each nozzle member 21, 22 is connected to the negative pressure supply means via a valve or the like.

The nozzle holding member 24 is screwed onto the nozzle shaft 23 so that the nozzle shaft 2
It is integrally attached to the lower end of 3. At the lower end of the nozzle holding member 24, there are provided a fitting portion 25 for the nozzle 27 and a pair of substantially flat leaf springs 26 arranged on both left and right sides of the fitting portion 25, and the upper end of the nozzle is provided. The nozzle 27 is fitted into the fitting portion 25 and is held from both sides by the leaf springs 26, so that the nozzle 27 is held by the nozzle holding member 2.
It is attached to the lower end of No. 4.

In the embodiment, the nozzle 27 is mainly used for mounting a small rectangular component, and therefore the tip of the nozzle has a thin shaft structure suitable for sucking the small component.

A negative pressure passage 28, which communicates with the negative pressure supply means via the nozzle shaft 23 and the nozzle holding member 24, is formed inside the shaft forming the nozzle 27. It communicates with the outside through a suction hole 30 formed in the nozzle tip 29.

As shown in FIG. 4, the suction holes 30 are hole portions 30b formed at the center of the nozzle, and hole portions 30a and 30 are formed at equal intervals in a horizontal line centering on the hole portion 30b.
It is composed of a total of three circular holes c, and at the time of mounting, the negative pressure introduced to the nozzle tip 29 through the negative pressure passage 28 acts on the parts through these hole portions 30a to 30b. It has become.

On the other hand, on the side of the conveyor 2, a component supply section 35 is arranged. The component supply unit 35 includes a large number of tape feeders 36 for supplying components, and each tape feeder 36 supplies components such as ICs and capacitors.

As shown in FIG. 5, the front end portion (the left end portion in FIG. 5) of each tape feeder 36 is attached to the feeder mounting base 1a erected on the base 1 by the positioning pin 37 and the mounting bracket 38. Installed.

The tape feeder 36 has a reel 3 around which a tape 40 containing a large number of components is wound on the rear side thereof.
9 is rotatably attached, and the tape 40 is led out from the reel 39 and guided to the component take-out portion 45 at the front end of the feeder, and is taken out by the tape take-out mechanism 46.

A tape 40 drawn from the reel 39.
Is composed of a tape body 40a and a cover tape 40b, as shown in FIGS. The tape body 4
0a is provided with a large number of component storage portions 40c opened at the top at regular intervals, and the component storage portions 40c are provided with components 41a.
And a plurality of engagement holes 40d are arranged at regular intervals on the side of the tape body 40a. The cover tape 40b is adhered to the upper surface of the tape body 40a so as to close each component storage portion 40c of the tape body 40a from above. Then, in the component take-out section 45, the cover tape 40b is attached to the tape body 40.
The part 41 is peeled off from a so that the part 41 can be taken out, the part 41 is adsorbed and taken out by the nozzle members 21 and 22, and a certain amount of the tape 40 is taken out by the tape feeding mechanism 46 along with the part taking-out operation. It is designed to be delivered intermittently.

The tape feeding mechanism 46 comprises a sprocket 47 located below the component take-out portion 45, and a ratchet 48 connected to the sprocket 47.
The sprocket 47 is engaged with the engagement hole 40d of the tape 40 guided to the component take-out portion 45. The ratchet 48 is intermittently rotated only in a fixed direction as the lever 49 attached to the front of the feeder is swung as the nozzle members 21 and 22 are lowered and raised when the parts are taken out. It is designed to feed out a fixed amount.

The cover tape 48b separated from the tape body 40a at the component take-out section 45 is guided by a cover tape take-up mechanism provided at the lower portion of the feeder, though not shown, and taken off.
The cover tape 40b is peeled off from the tape body 40a by the pulling force of the cover tape pulling mechanism.

6 to 9 show the structure of the component take-out portion 45.

In these figures, the component take-out section 45
Is a base portion 50 formed at the upper end in front of the feeder.
And a tape protection member 53, a shutter member 60, and a cover member 65 provided above it, and the tape 40 moves along the upper surface of the base portion 50.

The tape protecting member 53 is located above the tape passing portion of the base portion 50, and is located at the base portion 50.
And a mounting portion 54 that is continuously provided on the side of the tape protection member 53 is fixed to the front end portion of the feeder. The tape protection member 53 is provided with an engaging portion 55 for determining the peeling start position of the cover tape 40b at one end side thereof, and an opening portion 56 for taking out a component at a predetermined position in the middle portion. ing. When the component storage portion 40c of the tape body 40a reaches the position of the opening portion 56 after the cover tape 40b is peeled off at the position of the engagement portion 55, the component storage portion 40c is opened upward and the nozzle It is possible to take out the component 41 from above by the members 21 and 22. Further, the tape protecting member 53 is formed with a notch 57 for guiding a narrow shutter member having a predetermined width, which is continuous with the opening 56.

The shutter member 60 is arranged on the upper surface side of the tape protection member 53, is slidable back and forth, and operates in conjunction with the swing of the lever 49 and the operation of the tape feeding mechanism 46. A closed position (solid line position in FIG. 7) that closes at least a part of the open portion 56 except when the component is taken out, and a non-closed position where the open portion 56 is fully opened when the component is taken out (two-dot chain line position in FIG. 7) ) Is designed to slide. At one side of the shutter member 60, an edge portion 61 bent downward is provided.
Is provided, and the edge portion 61 is engaged with the cutout portion 57. Further, the shutter member 60 is provided with a long hole 62 for inserting a fixing pin 66 which will be described later, and a convex portion 63 which is inserted into the long hole which is described later for the cover member 65.

The cover member 65 is the shutter member 6
0 is arranged on the upper surface side, is connected and fixed to the tape protection member 43 by a fixing pin 66, and is provided with a long hole 67 for inserting the convex portion 63 and guiding it in the front-back direction. . The cover member 65 is made of, for example, a thin metal plate, and a pair of protrusions 68 are formed on one end side (right side in FIGS. 6 and 7) of the cover member 65 at predetermined intervals in the sliding direction of the shutter member 60. 68 is in contact with the surface of the shutter member 60.

The protrusion 68 is bent downwardly by pressing or the like, and is formed, for example, in a substantially trapezoidal cross section with a flat bottom as shown in FIG.
With such a shape, the cover member 65 elastically contacts the shutter member 60.

Next, the function and effect of the mounting machine configured as described above will be described.

In the above mounting machine, the head unit 5
The nozzle member 2 after being moved to the component supply unit 35.
1 (or the nozzle member 22) is moved up and down with respect to the component take-out portion 50 of the tape feeder 36, and negative pressure is supplied to the nozzle member 21,
The component 41 in the tape 40 is taken out in a state of being sucked by the nozzle member 21. When the removal of the component 41 by the nozzle member 21 is completed, the head unit 5 is moved above the printed circuit board 3 on which the nozzle unit 21 is positioned, and the nozzle member 21 is lowered. When the supply of pressure is cut off, the component 41 is mounted on the printed circuit board 3.

By the way, in the suction of a component by the nozzle member 21 in such a mounting operation, for example, as shown in FIG. 10, among the hole portions 30a to 30c constituting the suction hole 30 of the nozzle member 21, the middle hole. The part 30b is the part 41
Is located in the center of each of the parts 41 and the holes 30a to 30c are
The nozzle members 21 are arranged so as to be aligned in the longitudinal direction of the nozzle member 2, and the negative pressure supplied to the nozzle tip 29 through the holes 30a to 30c acts on the component 41 to cause the nozzle member 2 to move.
The component 41 is sucked by 1.

As described above, the suction holes 30 are formed in the hole portions 30a to 30.
In the nozzle structure of the above-described embodiment configured by c, even if the opening area of the suction hole 30 as a whole is sufficiently secured to obtain a predetermined suction force for the component 41, each of the hole portions 30a to 3a.
Since the opening area in units of 0c is relatively smaller than that of the component 41, negative pressure is applied to the corners of the component 41 and the corners of the component are adsorbed in a state where they are fitted in the adsorption holes. It is possible to appropriately adsorb the components without causing the above. Therefore, according to the mounting machine of the above embodiment,
Compared to a conventional mounting machine of this type that uses a nozzle structure with a single suction hole, it is possible to suck small rectangular parts more reliably and appropriately, thus increasing the suction rate. You can

In addition, according to the nozzle structure of the above embodiment, for example, as shown in FIG. 11, when the component 41 has a suction deviation around the nozzle axis (shown by the solid line in FIG. 11), both ends are Through the holes 30a, 30c of the component 41
Negative pressure acts on both end portions in the longitudinal direction of (1) to thereby correct the suction deviation (shown by the chain double-dashed line in FIG. 11). Therefore, also in this respect, the mounting accuracy can be improved. It should be noted that such a correction function is not always able to completely correct the suction deviation, but when the correction function is exerted and the suction deviation of the component is corrected to some extent, for example, the suction by the component recognition camera is corrected. When components are recognized and the correction amount is calculated, the error included in the calculated value can be reduced, and as a result, the mounting accuracy can be improved.

On the other hand, during the mounting operation as described above, in each of the tape feeders 36, the reel 3
The tape 40 led out from 9 is guided to the component taking-out portion 45, and the cover tape 40 is provided at the starting end side of the component taking-out portion 45.
After b is peeled off, the tape body 40a is guided forward below the tape protection member 53, and is intermittently fed by the tape feeding mechanism 46, while the opening portion 56 is being released.
At the position of, the component 41 stored in the component storage portion 40c of the tape body 40a is taken out by the nozzle members 21 and 22. And, until this take-out operation is performed,
Due to the shutter member 60 in the closed position, the component 4
1 is protected from jumping out of the opening portion 56, and the shutter member 60 slides to the non-closed position when the parts are taken out, and the parts 41 can be taken out. In addition,
In the present embodiment, as shown in FIG. 9, with the shutter member 60 in the closed position, the edge portion 61 of the shutter member 60 is arranged immediately above the component storage portion 40c of the tape 40, and the edge portion 61 of the component 41 is removed. It is designed to prevent jumping out.

By the way, in this type of tape feeder, since the shutter member floats above the tape protection member, the space between the tape component storage portion and the shutter member is expanded, and the component is set up in the component storage portion.
There is concern that this may impair the suitability of component adsorption.

However, in the tape feeder 1, as described above, the projection 68 of the tape protection member 53 provided on the upper surface of the shutter member 60 pushes the shutter member 60 toward the tape protection member 53 side. This prevents the shutter member 60 from rising, and thus prevents the component 41 from standing up in the component storage portion 40c. Moreover, the projecting portion 68 of the cover member 65 is formed in a substantially trapezoidal cross section,
As a result, the cover member 65 elastically abuts the shutter member 60, so that dimensional tolerances of components are effectively absorbed and the shutter member 60 is reliably prevented from rising.

As described above, according to the mounting machine of the above-described embodiment, the performance of the component suction side is enhanced by adopting the nozzle structure having the suction holes 30 including the hole portions 30a to 30c, and the tape is also provided. Since the feeder 36 has a structure in which the shutter member 60 is prevented from rising, the performance on the component supply side is improved.
By mutually improving these performances, it is possible to more appropriately mount small components.

The mounting machine of the above embodiment is an embodiment of the mounting machine to which the component suction nozzle according to the present invention is applied, and its specific configuration is within the scope not departing from the gist of the present invention. It can be changed as appropriate. For example, in the nozzle 27 of the above-described embodiment, the suction hole 30 is composed of circular hole portions 30a to 30c, but the shape of each hole portion 30a to 30c does not need to be strictly circular, and each hole is not required. Parts 30a-30
The diameter (size) of c, the arrangement interval, and the like may be appropriately selected according to the size and the like of the component. In addition, each hole 3
Regarding the diameter of 0a to 30c, it is desirable to form the diameter of about 3/5 of the dimension of the short piece in the component 41. That is, if the diameter is larger than this, air leakage occurs even if the nozzle members 21 and 22 are slightly displaced with respect to the component 41 during component adsorption, which is not practical.
Also, if the diameter is smaller than this, it becomes difficult to perform component suction with sufficient suction force in relation to the size of the component 41.

[0048]

As described above, according to the present invention, in the structure of the component suction nozzle, the tip of the shaft body having the passage communicating with the negative pressure source inside is provided with three substantially circular shapes which communicate with the passage. The suction holes are arranged in a line, and when suctioning the parts, the negative pressure acts on the parts through each suction hole to suck the parts. Even if the opening area of the entire hole is sufficiently secured, the opening area of each suction hole can be made relatively small with respect to the component, so that it is possible to prevent component suction failure such as so-called standing suction. The components can be more reliably and appropriately sucked. In addition, when suction deviation around the nozzle axis occurs in the component, negative suction is applied to both ends in the longitudinal direction of the component through the suction holes at both ends, and the suction deviation is corrected, so Can be done more appropriately.

Particularly, by making the diameter of each suction hole of the nozzle approximately 3/5 of the short piece size of the component, the component can be sucked with sufficient suction force to the component.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a mounter to which a component suction nozzle according to the present invention is applied.

FIG. 2 is a schematic front view showing a mounter to which the component suction nozzle according to the present invention is applied.

FIG. 3 is a schematic front view showing the structure of a nozzle member.

FIG. 4 is a view on arrow A in FIG. 3 showing the structure of the tip of the nozzle.

FIG. 5 is a side view showing an example of a tape feeder applied to a mounting machine.

FIG. 6 is an enlarged vertical cross-sectional view of a component taking-out portion of the tape feeder.

FIG. 7 is an enlarged plan view of a component taking-out portion of the tape feeder.

FIG. 8 is an enlarged plan view showing a state where a cover member of a component take-out portion is removed.

9 is a sectional view taken along line IX-IX in FIG. 7.

FIG. 10 is a schematic diagram illustrating a suction state of components by a nozzle member.

FIG. 11 is a schematic diagram illustrating a suction state of components by a nozzle member.

[Explanation of symbols]

 1 Base 5 Head Unit 21, 22 Nozzle Member 23 Nozzle Shaft 24 Nozzle Holding Member 27 Nozzle 28 Negative Pressure Passage 29 Nozzle Tip 30 Adsorption Hole 30a, 30b, 30c Hole 35 Parts Supply Part 36 Tape Feeder 41 Parts

Claims (2)

[Claims] 1. A component suction nozzle of a mounting machine, which is provided in a head unit movable between a component supply side and a component mounting side and sucks a rectangular component, wherein a passage leading to a negative pressure supply source is provided inside. A component suction nozzle for a mounting machine, wherein three substantially circular suction holes communicating with the passage are bored in a line at the tip of the formed shaft body. 2. A component suction nozzle for a mounting machine, wherein the diameter of each suction hole is formed to be approximately three-fifths of the short piece size of the component.