JPH06335888A - Nozzle fixing structure - Google Patents

Abstract

PURPOSE:To prevent effectively a nozzle from making rotational deviation by improving a property of the nozzle following up a nozzle shaft. CONSTITUTION:A housing member 14 provided with an inserting path 20 communicating to a negative pressure supply path 18 is forced into the lower end of a nozzle shaft 12 and a nozzle 16 is removably inserted in the inserting path 20. While a first ring holding groove 26 is formed on the wall surface of the inserting path 20 of the housing member 14 along the circumferential direction, an O-ring 30 made of a rubber material is disposed in the first ring holding groove 26 and the negative pressure supply path 18 of the nozzle shaft 12 and the first ring holding groove 26 are constituted to communicate to each other through a gap in a close contact portion between a flange 22 and the nozzle 16 under the condition of the nozzle 16 inserted in the inserting path 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention movably comprises a nozzle member for adsorbing chip parts, and this nozzle member is used to
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle fixing structure for a nozzle member, in particular, in a mounting machine or the like that sucks an electronic component such as C and mounts it on a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, a head unit movably mounted above a base is provided with a nozzle member for picking up a chip component so that the nozzle member can be raised and lowered and rotated, and this nozzle member sucks a chip component from a component supply section. After that, the mounting unit is generally known in which the head unit is moved onto the printed circuit board to mount the chip component on the printed circuit board.

In such a mounting machine, in the nozzle member, a nozzle is attached to the lower end of a hollow nozzle shaft, and negative pressure is supplied from a negative pressure supply source through a valve or the like to the nozzle shaft. The chip component can be sucked by being guided inside and acting on the nozzle.

Further, recently, since the chip parts have been diversified and have various shapes, the nozzle can be detachably attached to the nozzle shaft, and the nozzle can be replaced according to the shape of the chip part. Nozzle members are also widespread, and a nozzle member 90 as shown in FIGS. 6 and 7 is known as an example of such a nozzle member.

As shown in the figure, the nozzle member 90 comprises a nozzle shaft 91 having a negative pressure supply passage 92 and a nozzle 93 for sucking the chip component P.
Are fitted and attached to the lower end portion 94 of the nozzle shaft 91.

In the nozzle member 90, the upper edge 96 of the nozzle 93 is elastically held by a pair of leaf springs 95 attached to the nozzle shaft 91. When a larger external force acts on the nozzle withdrawal direction, the nozzle 93 is separated from the nozzle shaft 91 as shown in FIG. 7.

[0007]

However, although the nozzle member 90 having the above-described structure is excellent in that the nozzle 93 can be detachably mounted, the nozzle 93 is rotated by the rotation of the nozzle shaft 91 during mounting. However, there is a defect that the so-called nozzle 93 is rotated relative to the nozzle shaft 91, that is, a so-called rotational deviation of the nozzle 93 occurs. That is,
As shown in FIG. 6, when the nozzle shaft 91 is rotated and stopped in a state where the chip component P is adsorbed, an inertial force in the rotational direction is generated in the nozzle 91, and this inertial force causes the leaf spring 95.
If the holding force is exceeded, the nozzle 93 will rotate with respect to the nozzle shaft 91.

By the way, the rotation amount of the nozzle shaft 91 is set in the controller of the mounting machine based on the supply direction of the chip component P supplied to the component supply section and the predetermined mounting direction of the printed circuit board. Because it is
When the nozzle 93 relatively rotates with respect to the nozzle shaft 91 as described above, the chip component P is mounted with a shift in a predetermined mounting direction, which causes a defect such as conduction failure.

The present invention has been made to solve the above problems, and by improving the followability of the nozzle with respect to the nozzle shaft, the nozzle fixing structure capable of effectively preventing the rotational deviation of the nozzle. Is intended to provide.

[0010]

According to the present invention, a nozzle for adsorbing a chip component is attached to and detached from a lower end portion of a nozzle shaft rotatably provided in a head unit of a mounting machine and having a negative pressure supply passage therein. In the freely attached structure,
A nozzle mounting portion having an insertion passage communicating with the negative pressure supply passage is provided at a lower end portion of the nozzle shaft, and the nozzle is inserted into the insertion passage, and a wall surface of the insertion passage of the nozzle mounting portion is provided. A groove member is formed in the circumferential direction, and a ring member made of an elastic material is disposed in the groove member. With the nozzle inserted in the insertion passage, the upper peripheral surface of the nozzle and the ring member are Are closely contacted with each other, and the negative pressure supply passage of the nozzle shaft and the groove are communicated with each other (Claim 1).

Further, the insertion passage of the nozzle mounting portion has a stepped structure in which an upper wall surface of the groove portion is extended in the axial direction to form a small diameter above the groove portion. The upper portion of the nozzle is formed in a tapered shape whose outer diameter gradually decreases upward (claim 2).

[0012]

According to the present invention, the nozzle is inserted into the insertion passage of the nozzle mounting portion provided at the lower end of the nozzle shaft,
In this state, the groove formed in the nozzle mounting portion is closed by the nozzle. At this time, the closed groove portion communicates with the negative pressure supply passage of the nozzle shaft through a gap between the nozzle outer peripheral surface and the nozzle mounting portion inner peripheral surface.

When negative pressure is supplied to the nozzle shaft and the chip component is attracted to the nozzle, the negative pressure supplied to the negative pressure supply passage of the nozzle shaft is supplied to the groove. When the negative pressure is supplied to the groove portion in this way, the ring member arranged in the groove portion is adsorbed between the outer peripheral surface of the nozzle and the upper wall surface of the groove portion, thereby rotating the nozzle with respect to the nozzle mounting portion. The resistance is increased and the followability of the nozzle with respect to the nozzle mounting portion is improved. Therefore, even when the nozzle shaft is rotated and stopped in accordance with the mounting operation of the chip component, the so-called rotational deviation of the nozzle in which the nozzle relatively rotates with respect to the nozzle shaft due to the inertial force is not caused. ).

Further, by extending the upper wall surface of the groove portion in the axial direction, the insertion passage of the nozzle mounting portion has a stepped structure and the upper portion of the nozzle is formed so as to gradually decrease upward. Then, the space of the closed groove is formed in a wedge shape in cross section surrounded by the groove upper wall surface and the nozzle outer peripheral surface. In other words, since the ring member that is attracted by the supply of negative pressure is sandwiched between the upper wall surface of the groove and the outer peripheral surface of the nozzle and firmly adheres, the followability of the nozzle to the nozzle mounting portion is further improved. Therefore, it is possible to effectively prevent the rotational deviation of the nozzle (claim 2).

[0015]

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

FIG. 1 is a sectional view showing a nozzle member 10 to which a nozzle fixing structure according to the present invention is applied. As shown in the figure, the nozzle member 10 includes a nozzle shaft 12
And a housing member 1 integrally press-fitted into the lower end thereof.
4 (nozzle mounting portion) and a nozzle 16 inserted into the housing member 14.

Although not shown, the nozzle shaft 12 is mounted on a head unit movably provided above the base in the mounting machine, and is used for raising and lowering a motor or the like via a transmission means. It is connected to the drive means and the rotation drive means, and is thereby supported so as to be vertically movable and rotatable. Further, the nozzle shaft 12 has a negative pressure supply passage 18 therein, and the negative pressure supply passage 18 is connected to a negative pressure supply source (not shown) via a valve or the like.

The housing member 14 is a cylindrical member having an insertion passage 20 therein, and its upper end has
By providing the flange 22, a connecting hole 24 having a diameter smaller than that of the insertion passage 20 is formed, and the insertion passage 20 is communicated with the negative pressure supply passage 18 of the nozzle shaft 12 through the communication hole 24. ing.

Further, on the inner peripheral surface of the upper portion of the housing member 14, there is formed a first ring holding groove portion 26 (groove portion) having the flange 22 as an upper wall surface over the circumferential direction thereof, and below the first ring holding groove portion 26. A second ring holding groove 28 having a width narrower than that of the first ring holding groove 26 is formed with a predetermined distance from the first ring holding groove 26.

An O-ring 30 (ring member) made of a rubber material is arranged in the first ring holding groove portion 26, while a metal for nozzle locking is made in the second ring holding groove portion 28. A C ring 32 is arranged. At this time, the inner diameter of the O-ring 30 is set to be substantially the same as the diameter of the communication hole 24, and the inner diameter of the C-ring 32 is set to be slightly smaller than the inner diameter of the insertion passage 20. It is set.

Further, a steel ball 34 is embedded in the lower inner peripheral surface of the second ring holding groove portion 28, and a part of the steel ball 34 projects into the insertion passage 20. .

On the other hand, the nozzle 16 has a negative pressure acting passage 36 therein, and the negative pressure acting passage 36 passes through the communicating hole 24 of the housing member 14 and the negative pressure supplying passage of the cylinder shaft 12. It is designed to communicate with 18.

As shown in FIG. 1, the nozzle 16 has a fixing portion 40 having an outer diameter gradually increasing upward and a taper shape having an outer diameter gradually decreasing upward. The formed contact portion 42 is continuously provided upward from the intermediate portion of the nozzle 16, and the outer diameter of the nozzle 16 at the critical portion 48 between the fixed portion 40 and the contact portion 42 is the insertion passage. It is formed so as to be substantially equal to the inner diameter of 20. Further, the upper end portion of the nozzle 16, that is, the upper end portion of the close contact portion 42, is formed such that the outer diameter thereof is slightly smaller than the diameter of the communication hole 24 of the housing member 14 and can be inserted into the communication hole 24.

Further, the critical portion 48 is set so as to be located above the position where the C ring 32 is disposed when the nozzle 16 is inserted and attached to the housing member 14. And the nozzle 16 at the critical portion 48
Since the outer diameter of the nozzle 16 is larger than the inner diameter of the C ring 32, the inserted nozzle 16 has a critical portion 48 of the nozzle 16 and the above C as shown in FIGS.
The engagement with the ring 32 causes the C ring 32 to function as a snap ring, which causes the nozzle 16 to move.
It is held in the housing 4 so that it does not easily come off.

Further, a positioning groove 46 extending in the vertical direction is formed on the outer peripheral surface of the nozzle 16. The steel ball 34 disposed on the housing member 14 is interposed in the positioning groove 46, and the positioning groove 46 and the steel ball 34 are engaged with each other as shown in FIGS. 1 and 2. By fitting, the housing member 1 of the nozzle 16
The rotation relative to 4 is largely suppressed.

A flange portion 44 for clamping is formed on the lower outer peripheral surface of the nozzle 16, and the nozzle 16
At the time of removal, the flange portion 44 is clamped by a clamp member 50 (shown in FIG. 4) such as an exchange device (not shown).

In the structure described above, when the mounting operation of the chip component on the printed board is started, the nozzle member 10 is moved to a predetermined chip component supply section, and at the same time,
The supply of negative pressure to the negative pressure supply passage 18 of the nozzle shaft 12 is started, and this negative pressure is communicated with the communication hole 24 of the housing member 14.
And the nozzle 16 through the negative pressure passage 36 of the nozzle 16.
It acts on the suction portion 38 at the lower end, so that a predetermined chip component P is sucked from the component supply portion as shown in FIG.

The chip component P sucked by the suction portion 38 at the lower end of the nozzle 16 as described above is moved onto the printed circuit board by the movement of the head unit and the vertical movement and rotation of the nozzle shaft 12, so that the component is moved. The suction position of the nozzle 16 is corrected by recognition or centering, and the printed circuit board is mounted at a predetermined mounting position in a predetermined direction.

By the way, in the mounting operation as described above, when the nozzle shaft 12 is rotated and stopped, the nozzle 16 is rotationally displaced, which causes the chip component P to be displaced in a predetermined direction. There is a concern that mounting defects such as In particular, in a large chip component, since the inertial force generated when the nozzle shaft 12 rotates is large, there is a concern that the above-mentioned rotational deviation tends to increase.

However, in the nozzle member 10, the steel ball 3 provided on the housing member 14 as described above.
By engaging 4 with the positioning groove 46 of the nozzle 14,
Relative rotation of the nozzle 16 with respect to the housing member 14 is largely suppressed, and frictional resistance between the O-ring 30 and the nozzle 16 provided on the housing member 14 can reliably prevent rotational deviation of the nozzle 16 due to inertial force. It has become. More specifically, when the nozzle 16 is inserted into the housing member 14, the outer peripheral surface of the close contact portion 42 of the nozzle 16 comes into close contact with the edge of the flange 22 and the inner peripheral surface of the housing member 14 as shown in FIG. The contact portion 42 closes the first ring holding groove portion 30 from the inside. In this state, there is some clearance between the outer peripheral surface of the close contact portion 42 of the nozzle 16 and the contact portion between the flange 22 and the groove portion 30 via this clearance.
Is communicated with the negative pressure supply passage 18, the negative pressure supplied to the negative pressure supply passage 18 of the nozzle shaft 12 after the chip component P is adsorbed by the nozzle 16 is further passed through the clearance. It is supplied into the 1-ring holding groove portion 26. Then, when the negative pressure is supplied to the first ring holding groove portion 26 in this way, as shown in FIG.
The O-ring 30 arranged in the ring holding groove 26 is adsorbed toward the contact portion between the outer peripheral surface of the contact portion 42 and the flange 22. At this time, since the O-ring 30 is made of a rubber material, the O-ring 30 is deformed as shown in the figure, and is brought into close contact with the outer peripheral surface of the close contact portion 42 and the lower end surface of the flange 22. That is, as described above, the O-ring 30 comes into close contact with the outer peripheral surface of the close contact portion 42 of the nozzle 16 and the lower end surface of the flange 22 to increase the rotational resistance of the nozzle 16 with respect to the housing member 14. Due to this increase in rotation resistance, the nozzle 1 with respect to the housing member 14
The followability of No. 6 is improved, and the rotational displacement of the nozzle 16 does not occur. Therefore, in the mounting machine using the nozzle member 10, it is possible to effectively eliminate the mounting failure of the electronic component due to the rotational displacement of the nozzle.

Further, by providing a close contact portion 42 having an outer diameter gradually decreasing upward on the upper portion of the nozzle 16, the closed space surrounded by the outer peripheral surface of the close contact portion 42 and the first ring holding groove 26 is viewed in cross section. It can be formed in a wedge shape. That is, the O-ring 30 to be attracted is attached to the flange 22.
The lower end surface and the outer peripheral surface of the close contact portion 42 can be tightly adhered to each other by being sandwiched between them, whereby the rotation resistance of the nozzle 16 with respect to the housing member 14 is further increased, and the rotation deviation prevention effect of the nozzle 16 is enhanced. You can

On the other hand, in the nozzle member 10, when the nozzle 16 is replaced, the nozzle 16 is pulled out from the nozzle shaft 12 by applying an external force to the nozzle 16 in the nozzle pulling direction. In particular,
As shown in FIG. 4, after the flange portion 44 of the nozzle 16 is clamped by the clamp member 50 provided on the base or the like, the nozzle shaft 12 is raised to move the nozzle 16 to the housing as shown in FIG. Member 14
Try to pull it out from At this time, the nozzle shaft 12
The nozzle 16 can be pulled out while the C ring 32 is being spread by the fixing portion 32 as the nozzle rises.

On the contrary, when the nozzle 16 is inserted into the nozzle shaft 12, it is set in advance so that the position of the steel ball 34 of the housing member 14 and the position of the positioning groove 46 of the nozzle 16 match. The nozzle shaft 12 is lowered. At this time, the nozzle 16 is the nozzle shaft 1
2, the C ring 32 is inserted into the insertion passage 20 of the housing member 14 while expanding the C ring 32 by the close contact portion 42, and the C ring 32 is inserted into the critical portion 4 of the nozzle 16.
It is arranged to be inserted and attached to the nozzle shaft 12 by being arranged below.

The nozzle 16 is attached and detached in this manner. In this case, by providing the contact portion 42 whose outer diameter is gradually reduced upward on the upper portion of the nozzle 16, the inside of the O-ring 30 when the nozzle 16 is attached and detached. There is also an advantage that abrasion of the O-ring 30 due to friction between the peripheral surface and the contact portion 42 can be suppressed.

The nozzle member 10 is an embodiment to which the nozzle fixing structure of the present invention is applied, and various modifications other than the above embodiment can be considered. For example, in the above embodiment, the housing member 14 is press-fitted into the lower end of the nozzle shaft 12 and the nozzle 16 is inserted into the housing member 14. However, without providing the housing member 14, the lower end of the nozzle shaft 12 is not provided. O-ring 3 on the part
The nozzle 16, the C ring 32, the steel ball 34, and the like may be disposed, and the nozzle 16 may be directly attached to the nozzle shaft 12.

Further, in the above embodiment, when the negative pressure is supplied to the first ring holding groove portion 26, the negative pressure is supplied by utilizing the gap in the close contact portion between the flange 22 and the close contact portion 42 of the nozzle 16, that is, Flange 22 and contact portion 42
This is used as a communication hole in consideration of the fact that a minute gap is produced in the portion closely contacted with the. However, for example, the flange 22 or the close contact portion 42 extends radially from the axial center of the nozzle member 10. A passage that connects the negative pressure supply passage 18 and the first ring holding groove portion 26 by forming a plurality of narrow grooves or by designing in advance so that a gap is formed between the flange 22 and the close contact portion 42. May be provided.

Further, in the above embodiment, the nozzle 16 is held in the housing member 14 by utilizing the C ring 32. However, for example, a pin member is provided so as to project on the inner peripheral surface of the housing member 14. By forming a locking groove composed of a vertical groove and a horizontal groove on the outer peripheral surface of the nozzle 16, and interposingly engaging the pin member of the housing member 14 with the locking groove of the nozzle 16, the nozzle 16 is inserted into the housing member 14. It may be configured to hold.

In addition, in the above embodiment, from the viewpoint of preventing the rotational displacement of the nozzle 16 with respect to the housing member 14, a steel ball 34 is provided on the housing member 14, and the steel ball 34 is positioned in the positioning groove 46 of the nozzle 16. However, for example, instead of the steel ball 34, a pin member may be provided upright. Of course, the nozzle of the present invention can be fixed without providing the steel ball 34 or the like. The nozzle member may be configured by applying only the structure.

[0039]

As described above, according to the present invention, the nozzle mounting portion provided with the insertion passage communicating with the negative pressure supply passage is provided at the lower end portion of the nozzle shaft, and the nozzle is inserted into the insertion passage. And a groove is formed on the wall surface of the insertion passage of the nozzle mounting portion in the circumferential direction thereof, and a ring member made of an elastic material is disposed in the groove, and the nozzle is inserted into the insertion passage. Since the upper peripheral surface of the nozzle and the ring member are in close contact with each other and the negative pressure supply path of the nozzle shaft and the groove portion are communicated with each other, the negative pressure is supplied to the nozzle shaft. When the chip component is adsorbed by the nozzle, the negative pressure supplied to the negative pressure supply passage of the nozzle shaft is further supplied to the groove portion, and the ring member arranged in the groove portion extends between the nozzle outer peripheral surface and the groove upper wall surface. Is absorbed It becomes door. As a result, the rotation resistance of the nozzle with respect to the nozzle mounting portion is increased, and the followability of the nozzle with respect to the nozzle mounting portion is improved. Therefore, it is possible to effectively prevent the rotational deviation of the nozzle even when the nozzle shaft rotates or stops. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a nozzle member to which a nozzle fixing structure of the present invention is applied.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view showing a state in which a nozzle is removed from a nozzle member.

FIG. 5 is an enlarged view of a main part showing a nozzle member.

FIG. 6 is a cross-sectional view showing a conventional nozzle member.

FIG. 7 is a cross-sectional view showing a state in which a nozzle is removed from a conventional nozzle member.

[Explanation of symbols]

 10 Nozzle Member 12 Nozzle Shaft 14 Housing Member 16 Nozzle 18 Negative Pressure Supply Channel 20 Insertion Channel 22 Flange 26 First Ring Holding Groove 28 Second Ring Holding Groove

Claims (2)

[Claims] 1. A structure in which a nozzle for adsorbing a chip component is detachably attached to a lower end portion of a nozzle shaft rotatably provided in a head unit of a mounting machine and provided with a negative pressure supply passage therein. A nozzle mounting portion having an insertion passage communicating with the negative pressure supply passage is provided at a lower end portion of the nozzle shaft, and the nozzle is inserted into the insertion passage, and a wall surface of the insertion passage of the nozzle mounting portion is provided. To
A groove member is formed over the circumferential direction, a ring member made of an elastic material is arranged in the groove portion, and the upper peripheral surface of the nozzle and the ring member are in a state in which the nozzle is attached to the insertion passage. A structure for fixing a nozzle, characterized in that the nozzle shaft and the negative pressure supply passage of the nozzle shaft communicate with each other and the groove portion. 2. The insertion passage of the nozzle mounting portion has a stepped structure in which an upper wall surface of the groove portion is extended in an axial direction to form a small diameter above the groove portion. The nozzle fixing structure according to claim 1, wherein the upper portion of the nozzle is formed in a tapered shape whose outer diameter gradually decreases upward.