JP3453447B2 - Nozzle holding structure of mounting machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting machine for sucking and mounting components by means of a nozzle member mounted on a movable head unit, and more particularly, a mounting machine in which nozzles are selectively mounted according to the type of the component. The present invention relates to the nozzle holding structure.

[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 that is detachably attached to the lower end portion thereof, and the negative pressure for component suction is negative pressure. It is introduced from the supply source into the nozzle shaft and acts on the tip of the nozzle.

In the above nozzle member, for example, a nozzle suitable for the type of the component to be sucked can be selectively mounted on the nozzle shaft. By doing so, the component can be sucked and mounted appropriately. ing. Furthermore, recently, by providing a spring in the nozzle mounting portion (holder portion) of the nozzle shaft, the nozzle is supported so as to be able to move up and down elastically, so that the nozzle and the component come into contact with each other or the component and the printed circuit board come into contact with each other. There has been proposed a device capable of relieving the impact force in the event of a collision (Japanese Patent Laid-Open No. HEI 2).
-174299 publication).

[0005]

By the way, the above-mentioned function of alleviating the impact force on the parts is a function required when mounting a small chip component or the like which is weak against the impact force and is easily damaged at a high speed. Therefore, it is not necessarily required for a large component such as a QFP, which is relatively strong against impact force, and in which high-speed mounting is hardly performed because mounting accuracy is important.

However, in the above-mentioned conventional device that elastically supports the nozzle, regardless of the type of the nozzle to be mounted,
That is, since the nozzle is always elastically supported regardless of the type of component to be mounted, this causes an adverse effect such as a reduction in mounting accuracy when mounting a large component such as QFP.

That is, this type of device has a fitting portion for elastically supporting the nozzle, and since it is necessary to prevent relative rotation between the nozzle shaft and the nozzle, a rotation stopping mechanism is provided between the holder portion and the nozzle. Is provided,
When the vertical movement of the nozzle is allowed, backlash may occur in the fitting portion and the rotation stopping mechanism portion, which deteriorates the followability of the nozzle to the nozzle shaft and causes an error in the rotational direction of the mounted component. . Such an error in the rotation direction caused by the backlash does not cause a problem in the function in the case of a small chip component, but in the case of a large QFP or the like, the positional deviation in the peripheral portion becomes large and cannot be ignored. Decrease mounting accuracy moderately.

The present invention has been made in order to solve the above problem, and selectively mounts a mounting state in which the impact force on a component is prioritized and a mounting state in which the mounting accuracy is prioritized according to the type of the component. Nozzle holding structure of a mounting machine that can perform appropriate mounting according to the type of parts so that it can be carried out.

[0009]

A nozzle holding structure for a mounting machine according to a first aspect of the present invention comprises a nozzle shaft provided in a head unit and a nozzle detachably attached to the nozzle shaft, and the nozzle is small in size. A mounting machine configured such that a first nozzle for mounting components and a second nozzle for mounting large components are selectively mounted on a nozzle shaft according to the type of component,
A shaft body connected to the head unit, a holder having a nozzle holding portion at the tip, and a holder movably mounted in the shaft body in the axial direction thereof, and an elastic member for urging the holder toward the tip side. And a regulating means for preventing relative movement of the second nozzle with respect to the shaft main body when the second nozzle is mounted on the holder, at a corresponding position between the second nozzle and the shaft main body. Is.

According to a second aspect of the present invention, there is provided a nozzle holding structure for a mounting machine, wherein in the nozzle holding structure according to the first aspect, the restricting means includes engaging portions provided on both upper end sides of the second nozzle, and the shaft body. And an engaged portion which is provided at the lower end portion of the second nozzle and which engages with the engaging portion when the second nozzle is mounted on the holder.

According to a third aspect of the present invention, there is provided a nozzle holding structure for a mounting machine, wherein in the nozzle holding structure according to the second aspect, the engaging portion and the engaged portion are arranged in an axial direction and a rotational direction of the second nozzle with respect to the holder. It is configured to engage in a state in which relative movement is blocked.

[0012]

According to the nozzle holding structure described in claim 1,
When the first nozzle is mounted on the holder, the holder is allowed to move relative to the shaft body in the axial direction. Therefore, when a small chip component is mounted at high speed using the first nozzle, the holder has a cushioning function and is moved in the axial direction of the shaft body to reduce the impact force on the component. Is demonstrated. On the other hand, when the second nozzle is mounted on the holder, relative movement of the holder with respect to the shaft body is blocked, and the nozzle shaft, the holder, and the nozzle are operated integrally. Therefore, the followability of the nozzle with respect to the nozzle shaft is enhanced, and as a result, the mounting accuracy of the component is ensured.

According to the nozzle holding structure of the second aspect, the engaging portion provided on the second nozzle engages with the engaged portion of the shaft main body, so that the second nozzle and the holder with respect to the shaft main body. Relative movement is prevented.

According to the nozzle holding structure of the third aspect, the second nozzle is securely fixed to the shaft body.

[0015]

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

1 and 2 are schematic views showing a nozzle member to which the nozzle holding structure according to the present invention is applied, and FIG.
It is sectional drawing which shows a nozzle member. As shown in these drawings, the nozzle member 1 is composed of a nozzle shaft 2, a nozzle holding member 3 integrally attached to the nozzle shaft 2, and a nozzle detachably attached to the nozzle holding member 3. . As the nozzle, the first nozzle 15 shown in these figures is used.
And a second nozzle 17 shown in FIGS. 4 and 5, which will be described later, are selectively mounted.

Although not shown, the nozzle shaft 2 is attached to a head unit that is movably provided above the base of the mounting machine, and is connected to an elevating mechanism and a rotating mechanism mounted on the head unit. As a result, the head unit is rotatably supported by the head unit. A passage 2a for negative pressure supply is formed inside the nozzle shaft 2, and the passage 2a is connected to a negative pressure supply source (not shown) via a valve or the like.

The nozzle holding member 3 has a cylindrical holding frame 4.
And a cylindrical holder 5 that is fitted in the holding frame 4 slidably in the vertical direction (axial direction).
Then, the holding frame 4 is screwed onto the nozzle shaft 2 so that the nozzle holding member 3 is attached to the nozzle shaft 2.
Is integrally attached to the lower end of the.

Inside the holding frame 4, the holder 5 is provided.
A spring 8 is provided between the holding frame 4 and the upper step portion of the holding frame 4. Further, a pair of guide holes 6 (a pair of left and right in FIG. 3) extending in the vertical direction is formed in the holding frame 4, and a guide pin 7 penetrating in the radial direction is provided in the holder 5, and both ends of the guide pin 7 are provided. The part projects into each of the guide holes 6. That is, the holder 5 can be moved vertically relative to the holding frame 4 within the range allowed by the guide hole 6 while being urged downward by the spring 8. With
The rotation preventing function of the holder 5 with respect to the holding frame 4 is exerted.

A thin shaft portion 9 is provided at the lower end of the holder 5,
A substantially flat leaf spring 10 fixed on both left and right sides of the thin shaft portion 9 is provided, and the thin shaft portion 9 and the leaf spring 10 constitute a mounting portion for the nozzle.

The holding frame 4 has a lower end portion,
A pair of flanges 11 (engaged portions) are formed so as to project in a direction (horizontal direction in FIG. 2) orthogonal to the direction in which the leaf spring 10 is arranged, and a trapezoidal projection (see FIG. 1) is provided at the lower end thereof. 12 (engaged portion) is formed.

The first nozzle 15 shown in FIGS.
Is a nozzle mainly for mounting a small component such as a chip component, and therefore, the tip has a thin shaft structure suitable for sucking the small component. Although not shown, a negative pressure supply passage communicating with the inside of the nozzle holding member 3 is formed inside the nozzle, and during mounting, a negative pressure for adsorbing components is applied to the nozzle 15 through this passage. It acts on the tip of the.

Further, a held portion 16 is formed on the upper end portion of the nozzle 15, and the held portion 16 is attached to the lower end portion of the holder 5 as shown in FIG. . Specifically, the nozzle 15 is attached to the lower end portion of the holder 5 with the thin shaft portion 9 inserted into the held portion 16, and a plate is formed on the protruding portions formed on both the left and right sides of the held portion 16. The nozzle 15 is held by the holder 5 by engaging the tip of the spring 10.
The surface of each of the protruding portions of the held portion 16 is formed to be substantially flat, whereby the nozzle 15 for the holder 5 is formed.
The anti-rotation function of is demonstrated.

The held portion 16 of the first nozzle 15 is held.
2, the direction orthogonal to the direction in which the projecting portion is formed (the left-right direction in FIG. 2) is formed so as to be narrower than the interval between the flanges 11 as shown in FIG.

By the way, in the nozzle member 1, instead of the first nozzle 15 for mounting a chip component or the like as described above, a large component such as a QFP as shown in FIGS. 4 and 5 is mainly mounted. It is also possible to mount the second nozzle 17 for this purpose.

The second nozzle 17 has a box-shaped structure with its tip opening downward so that a negative pressure can be applied over a wide range of the component surface, and the upper end portion thereof has the above-mentioned first part. Like the one nozzle 15, a held portion 18 for the holder 5 is provided.

The held portion 18 is also formed with projecting portions having the same shape as the held portion 16 on the left and right sides thereof, and the thin shaft portion 9 is inserted into the held portion 18. The nozzle 17 is attached to the lower end of the holder 5,
The nozzle 17 is held by the holder 5 by engaging the tip of the leaf spring 10 with the protruding portion of the held portion 18.

However, in the second nozzle 17, the held portion 18
In the direction orthogonal to the direction in which the protruding portion is formed (the left-right direction in FIG. 5), unlike the first nozzle 15,
As shown in FIG. 5, the groove 19 is formed so as to be wider than the gap between the flanges 11, and a groove 19 (engagement portion) having a substantially triangular cross section corresponding to the protrusion 12 formed on the flange 11 is formed on the upper surface portion thereof. Is formed, and the projection 12 and the groove 19 are fitted to each other with the nozzle 17 mounted on the holder 5.

In order to exchange the nozzles 15 and 17 with each other in the nozzle member 1 configured as described above, for example, the nozzle 15 (or
By applying a downward force to the nozzle 17) that is greater than the holding force of the leaf spring 10, the nozzle 15
(Or the nozzle 17) can be removed from the holder 5. On the other hand, instead of this, the nozzle 17 (or the nozzle 1
5) is attached to the holder 5, the leaf spring 10 of the holder 5 and the protruding portion of the nozzle 17 are made to correspond to each other, and in this state, the leaf spring 10 is spread by the protruding portion and the nozzle 17 is fitted into the tip of the holder 5. As a result, the nozzle 17 can be attached to the holder 5.

Next, the operation of the nozzle member 1 configured as described above will be described.

When the mounting operation is started in the mounting machine in which the nozzle member 1 is mounted, the nozzle shaft 2 is lowered with respect to the head unit after the head unit is arranged above the component supply section. As a result, the component supplied to the predetermined supply position of the component supply unit is the nozzle member 1.
Adsorbed by. At this time, the negative pressure is started to be supplied to the passage 2a of the nozzle shaft 2 as the nozzle shaft 2 descends, and this negative pressure acts on the tip of the nozzle 15 or 17 through the inside of the holder 3, whereby the component Adsorption is performed.

The components thus sucked by the nozzle member 1 are subjected to suction position correction by component recognition or centering with a straightening claw, and then the head unit is moved and the nozzle shaft 2 is moved up and down and rotated. It is moved onto the positioned printed circuit board and mounted at a predetermined mounting position on the printed circuit board in a predetermined direction.

Here, when a small component such as a chip component is sucked by the nozzle member 1, that is, when the nozzle 15 is mounted on the holder 5, the component is sucked, the tip of the nozzle 15 will be described. When the nozzle abuts on the surface of the component, it is raised with a cushioning property with respect to the holding frame 4, whereby the impact force when the nozzle 15 abuts the component is alleviated.

Similarly, when the component sucked by the nozzle 15 is mounted on the printed board, the holder 5 is also used.
Is raised with a proper cushioning property with respect to the holding frame 4, so that the impact force when the component comes into contact with the printed circuit board is alleviated.

Therefore, the damage of the component due to the collision of the nozzle and the component, which is likely to occur when the chip component or the like is mounted at high speed,
Alternatively, it is possible to effectively prevent damage to the component due to collision between the component and the printed circuit board.

On the other hand, when a large component such as QFP is sucked by the nozzle member 1, that is, the holder 5
When the component is sucked while the second nozzle 17 is attached to the nozzle 17, the nozzle 17 and the holding frame 4 are integrally operated.

That is, when the nozzle 17 is attached to the holder 5, as shown in FIGS.
Engages with the flange 11 of the holding frame 4, thereby preventing the nozzle 17 from moving relative to the holding frame 4 in the axially upward direction. Moreover, by fitting the projection 12 having a trapezoidal cross section formed on the flange 11 into the groove 19 having a triangular cross section formed in the held portion 16, the nozzle 17 relative to the holding frame 4 in the rotational direction. Is blocked more firmly.

Therefore, when a large component such as QFP is sucked, the cushioning property as in the case where the nozzle 15 is mounted is not exhibited, but the nozzle 17 and the holding frame 4 can be lifted and rotated completely integrally. As a result, the followability of the nozzle 17 with respect to the nozzle shaft 2 is improved, and as a result, the component mounting accuracy is improved.

As described above, according to the nozzle member 1 of the above-described embodiment, the nozzle 15 and the nozzle 17 are selected depending on the type of the mounted component.
Is selectively attached to the holder 5 to allow the axial movement of the nozzle 15 with respect to the nozzle shaft 2, thereby giving a cushioning property to the nozzle 15 and giving priority to the function of alleviating the impact force on the component. Since it is possible to selectively perform a mounting state and a mounting mode in which movement of the nozzle 17 with respect to the nozzle shaft 2 in the axial direction and the rotational direction is blocked and the mounting accuracy of components is prioritized, this allows a conventional apparatus of this type. Therefore, it is possible to effectively prevent the adverse effect of the deterioration of the mounting accuracy on the large-sized component, etc., which has occurred in step 1, and perform the appropriate mounting according to the type of the component.

The above-mentioned nozzle member 1 is an example of a nozzle member to which the nozzle holding structure of the present invention is applied, and its specific structure can be appropriately changed without departing from the gist of the present invention. For example, in the nozzle member 1, the held portions 16 and 18 of the nozzles 15 and 17 are held by the plate spring 10 so that the nozzles 15 and 17 are held by the holder 5.
The nozzles 15 and 17 may be attached to the holder 5 by press fitting, screwing, or the like.

Further, in the above-described embodiment, the flange 12 of the holding frame 4 is provided with the projection 12 and the holding portion 18 of the nozzle 17 is provided with the groove 19, and these are fitted to each other to fit the nozzle 17 to the nozzle shaft 2. Although the pin 11 is provided in the flange 11 and the pin member is projectingly provided on the held portion 18, the pin member is configured to project into the pin hole. I don't mind.

Further, in the above-mentioned embodiment, one type of each of the first and second nozzles 15 and 17 is provided, and these are selectively attached to the holder 5. Alternatively, the second nozzles 15 and 17 may be provided for each of a plurality of types having different nozzle diameters and the like, and may be selectively mounted.

[0043]

As described above, according to the nozzle holding structure of the present invention, in the state where the first nozzle for mounting the small-sized component is mounted on the holder, the holder is relatively positioned with respect to the shaft body in the axial direction. By allowing the movement, the first nozzle and the holder can be moved integrally with a proper cushioning property, so that the impact force on the component can be effectively mitigated. On the other hand, in the state where the second nozzle for mounting a large-sized component is mounted on the holder, the relative movement of the holder with respect to the shaft body is blocked by the restricting means, and the nozzle shaft and the nozzle are integrally operated so that the nozzle shaft is not moved. The followability of the nozzle is enhanced, and as a result, the mounting accuracy of the component is ensured. Therefore, according to the nozzle holding structure of the present invention, it is possible to selectively perform the mounting state in which the impact force relaxation to the component is prioritized and the mounting mode in which the mounting accuracy of the component is prioritized. Appropriate implementation can be performed according to the requirements.

In this structure, the second nozzle is provided with the engaging portion, and the shaft main body is provided with the engaged portion that engages with the engaging portion when the second nozzle is mounted on the holder. By configuring the restricting means in this way, the above-described effects can be obtained with a simple configuration. In particular, if the engaging portion and the engaged portion are configured so as to engage with the holder so as to prevent relative movement of the second nozzle with respect to the holder in the axial direction and the rotational direction, it is possible to more reliably secure the second nozzle to the shaft body. The nozzle can be fixed.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a nozzle for mounting a small component such as a chip component is mounted on a nozzle member to which a nozzle holding structure according to the present invention is applied.

FIG. 2 is a view on arrow A in FIG.

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

FIG. 4 is a side view showing a state in which a nozzle for mounting a large component such as QFP is mounted on a nozzle member to which the nozzle holding structure according to the present invention is applied.

5 is a view on arrow B in FIG. 4. FIG.

[Explanation of symbols]

1 Nozzle member 2 nozzle shaft 3 Nozzle holding member 4 holding frame 5 holder 6 guide holes 7 Guide pin 8 springs 9 Thin shaft 10 leaf spring 11 flange 12 protrusions 15,17 nozzles 16,18 Held part 19 groove

Claims (3)

(57) [Claims] 1. A nozzle shaft provided in a head unit, and a nozzle removably mounted on the nozzle shaft. As the nozzle, a first nozzle for mounting a small component and a second nozzle for mounting a large component are provided. In a mounting machine configured to be selectively mounted on the nozzle shaft according to the type of component, the nozzle shaft has a shaft main body connected to the head unit, and a nozzle holding portion at the tip, The shaft main body is composed of a holder mounted so as to be movable in the axial direction thereof, and an elastic member for urging the holder toward the tip side, and the second nozzle and the shaft main body are provided at corresponding positions. A regulating means is provided for preventing relative movement of the second nozzle with respect to the shaft body when the second nozzle is mounted on the holder. Nozzle holding structure for mounting machine. 2. The restricting means is provided on both sides of the upper end of the second nozzle, and on the lower end of the shaft body, and the engaging is performed with the second nozzle mounted on the holder. The nozzle holding structure for a mounting machine according to claim 1, wherein the nozzle holding structure comprises an engaged portion that engages with the portion. 3. The engaging portion and the engaged portion are configured to engage in a state of preventing relative movement of the second nozzle with respect to the holder in the axial direction and the rotation direction. The nozzle holding structure of the mounting machine according to claim 2.