KR100799204B1 - Nozzle assembly of chip mounter - Google Patents

Abstract

The present invention relates to a nozzle assembly for a component mounter, the nozzle holder having a compliance with respect to the spindle axis, while preventing the rotational movement of the nozzle during the vertical movement of the nozzle and maintaining a straightness mechanism that can guide the nozzle accurately The upper part is supported by the spindle shaft, the nozzle holder for fixing the nozzle to the lower part, the outer guide is integral with the spindle shaft and the nozzle holder is inserted and the center part is fixed to the nozzle holder, the outer peripheral part is fixed to the outer guide And a nozzle holder guide device including at least one flexible disk having a rotational and horizontal rigidity to accurately mount the component at the height of the upper surface of the substrate and to reduce the damage of the component during high-speed movement. Provide the assembly.

Description

Nozzle assembly of chip mounter

1 is a schematic view showing an example of a nozzle assembly for a conventional component mounter,

2 is a perspective view schematically showing a nozzle assembly for a component mounter according to an embodiment of the present invention;

3A is an exploded perspective view of the nozzle assembly for the component mounter of FIG. 2;

3B is a plan view illustrating the flexible disk of the nozzle assembly for the component mounter of FIG. 2;

4 is a cross-sectional view showing a section IV-IV of the nozzle assembly for component mounter of FIG. 2.

5A, 5B, and 5C are schematic views showing the operation principle of the nozzle holder.

<Description of the symbols for the main parts of the drawings>

1, 10 ... nozzle assembly 11 ... spindle shaft

12 ... Nozzle 13 ... Nozzle Holder

14 ... External guide 15 ... Flexible disc

15a ... Disc of the flexible disc 15b ... Aperture for buffering the flexible disc 15c ... Hole for fixing the center of the flexible disc 15d ... Hole for fixing the outer circumference of the flexible disc                 

16 ... Bolt 17 ... Bellows

18 Nuts 19 Sleeves

TECHNICAL FIELD The present invention relates to a nozzle assembly for a component mounter, and more particularly, to a nozzle holder guide device for allowing a nozzle holder to be compliant with respect to a spindle axis.

The component mounter is a core equipment of the component mounting assembly equipment for mounting a component on a printed circuit board. The component mounter is a device that receives various components from a component supplier and transfers them to the mounting position of the printed circuit board and then mounts them on the printed circuit board.

The component mounting machine includes a feeder portion for supplying mounting components, a conveyor portion for conveying a printed circuit board to be worked on, a head portion for picking up mounting components from the feeder portion, and mounting them on a printed circuit board.

Referring to FIG. 1, a nozzle assembly 1 provided in a conventional component mounter head includes a nozzle 2 for absorbing a component at an end thereof for mounting a component on a printed circuit board, and a nozzle socket for fixing the nozzle. (3), a nozzle holder (5) for holding the nozzle socket on the spindle shaft (4), and a nozzle spring (6) which buffers when a vacuum is formed inside the nozzle to adsorb components. Include.

The nozzle assembly 1 of the component mounter adsorbs the component by the vacuum generated by the vacuum generator, and releases the vacuum after the adsorbed component is moved to the mounting position of the printed circuit board by the servo motor. By supplying compressed air to the nozzle, the compressed air force acts to mount the component at a mounting position on the printed circuit board.

In this case, when the component is mounted in the component mounter, it is difficult to accurately mount the component on the height of the upper surface of the substrate due to problems such as flatness of the substrate and may damage the component when the component is mounted. Thus, when designing the nozzle assembly, the nozzle holder is designed to have some degree of compliance with respect to the spindle axis.

In general, in order to ensure that the nozzle holder is compliant with the spindle axis, the spindle axis uses a method of supporting the nozzle holder with a mechanism such as a guide, a spring, bellows, or the like.

As a guide for giving a compliance to the nozzle, a hole-shaft method of inserting a shaft into a hole and a ball spline guide method are mainly used. However, the hole-shaft method is difficult to accurately guide the nozzle due to the play, and a separate mechanism for rotation prevention such as pins should be configured. In addition, the ball spline method is complicated and weight-increasing, which can cause damage to components during high-speed movement.

The present invention is to solve the problems as described above, in order to accurately mount the component to the height of the upper surface of the substrate and to reduce the damage of the component during high-speed movement, while the nozzle holder has compliance with respect to the spindle axis, the nozzle during the vertical movement of the nozzle It is an object of the present invention to provide a nozzle assembly for a component mounter including a nozzle holder guide device capable of accurately guiding a nozzle by preventing a rotational movement and maintaining straightness.

In order to achieve the above object, a nozzle assembly for a component mounter of the present invention includes: a nozzle holder having an upper portion supported by a spindle shaft and fixed to a lower portion; An external guide integrated with the spindle shaft and into which the nozzle holder is inserted; And at least one flexible disk having a central portion fixed to the nozzle holder, an outer peripheral portion fixed to the outer guide, and having rotational and horizontal rigidity.

In addition, the flexible disk is characterized by including a buffer opening in the disk surface of the flexible disk to increase the flexibility of the disk.

In addition, the flexible disk is characterized by being fixed to the external guide in a structure of a plurality of rows by at least one bolt.

In addition, it is located between the outer surface of the upper nozzle holder and the inner surface of the spindle shaft, characterized in that it further comprises a bellows to give the initial pressure to the flexible disk and seal the gas.

The present invention has a mechanism that can prevent the rotational movement when the nozzle equipped with the component moves up and down and maintain the nozzle straightness to guide the nozzle accurately, the upper part is supported by the spindle shaft, the lower part At least one flexible unit which is integral with the nozzle holder and the spindle shaft to be fixed and the outer guide into which the nozzle holder is inserted and the center portion is fixed to the nozzle holder, the outer circumferential portion is fixed to the outer guide, and has rotational and horizontal rigidity The nozzle holder guide device including the disk is implemented.

At this time, the flexible disk has a flexible structure in the direction of the plate consists of one or several thin layers, has a rotational and horizontal rigidity, the central portion is fixed to the nozzle holder by a predetermined fixing means, penetrating the upper and lower surfaces The outer guide is fixed to the outer guide in a plurality of rows by bolts. Therefore, when the nozzle is subjected to the vertical upward force, the nozzle holder only translates without rotational movement, and maintains almost infinite rigidity in the circumferential direction of the disc. Can not.

Hereinafter, a nozzle assembly of a component mounter according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, the nozzle assembly 10 for a component mounter according to an embodiment of the present invention includes a nozzle holder 13 having an upper portion supported by a spindle shaft 11 and fixing the nozzle 12 to a lower portion thereof. An outer guide 14 which is integral with the spindle shaft, into which the nozzle holder is inserted, and a central portion fixed to the nozzle holder, and an outer circumferential portion fixed to the outer guide, the flexible disk 15 having rotation and horizontal rigidity And a nozzle holder guide device.

At this time, the outer guide upper element 14a, the flexible disk 15, the outer guide intermediate element 14b, the flexible disk 15, and the outer guide lower element 14c, which are integral with the spindle shaft, are lower from the top. Row structures are fixed in a plurality of rows by at least one bolt 16 so as to be integral with the spindle shaft.

Referring to FIG. 3A, there is shown an exploded perspective view of the nozzle assembly for the component mounter, in which the spindle shaft 11 is fitted to the nozzle head body, and the outer guide is the outer guide upper element 14a integral with the spindle shaft. The outer guide middle element 14b and the outer guide lower element 14c are coupled by the bolts so that the flexible disks 15 can be fixed by the bolts 16 between the elements.

In addition, a screw thread 13a is formed so that the nut can be fastened to fix the flexible disk to the nozzle holder 13, and there is an elongated cylindrical portion 13b into which the sleeve can be fitted. The nozzle 12 is inserted into and fixed to the lower part of the nozzle holder.

There is also a bellows fitted over the nozzle holder, a nut 18 and a sleeve 19 fastened to a thread formed in the nozzle holder to secure the flexible disk beneath it.

Referring to FIG. 3B, a flexible disk 15 is shown. A buffer opening 15b is formed on the surface of the disk 15a to increase the flexibility of the disk, and the flexible disk 15 is fixed to the nozzle holder. A central fixing hole 15c and an outer peripheral fixing hole 15d for fixing the flexible disk to the external guide are formed.

In this case, the bolt penetrates through the outer circumferential fixing hole to fix the flexible disk to the outer guide. Preferably, the plurality of holes are disposed at regular intervals so that the load is evenly distributed on the flexible disk.

In addition, the buffer opening may have a shape in which the 'c' shape and the 'c' are inverted from left to right, respectively. In addition, a thin slit groove may be formed between the buffer opening and the buffer openings adjacent thereto to provide greater flexibility to the flexible disk. At this time, there is a bridge connecting the left and right shapes of the buffer opening due to the slit groove. In this case, the bridge can support the nozzle holder including the nozzle to deal with the external force more flexibly.

Referring to FIG. 4, a flexible disk 15 is inserted through a central hole on a portion where the lower end jaw of the nozzle holder 13 is formed, and a sleeve 19 is fitted along the nozzle holder middle part on the flexible disk. The flexible disk 15 is inserted through the hole in the center, and the nut 18 is fastened along the thread made in the nozzle holder on the flexible disk, so that the flexible disk is fixed to the nozzle holder.

In addition, the spindle shaft 11, the outer guide upper element 14a, the flexible disk 15, the outer guide middle element 14b, the flexible disk 15 and the outer guide lower element 14c, each of the outer periphery And a tab is formed in the hole of the outer guide lower element 14c, and the elements are coupled in a plurality of rows through holes formed in each element by at least one bolt 16 to be fixed to the nozzle holder. Flexible disks are fixed to the outer guide.                     

At this time, the nozzle holder and the external guide are coupled to each other using a leaf spring structure of a plurality of layers using at least one of the flexible disks, so that the flexible disk can have rotational and horizontal rigidity even with a large clearance of the nozzle holder. . In particular, when there is a limitation of the size of the external guide, a flexible disk having a multi-layer structure is useful, and the stroke in the vertical direction of the nozzle holder can be increased.

In addition, the bellows 17 is located between the outer surface of the upper portion of the nozzle holder and the inner surface of the through hole of the spindle shaft, giving an initial pressure to the flexible disk and sealing the gas to the nozzle assembly.

5A, 5B, and 5C are schematic views showing the operation principle of the nozzle holder.

5A, 5B, and 5C, when the nozzle holder 13 of FIG. 5A receives a vertical upward force as shown in FIG. 5B, the nozzle holder may be bent by the disk 15a of the flexible disk 15. Only translational movement is performed vertically upward without rotation. If the nozzle holder is inclined as shown in Fig. 5c during the vertical upward movement, the disc should be stretched or shortened as shown in Fig. 5c. However, due to the characteristics of the flexible disk can be bent, but can not increase or decrease, so only vertical upward movement as shown in Figure 5b. At this time, since the disk circumferential direction maintains almost infinite stiffness, the nozzle holder in the ascending movement process can not be rotated in the axial direction. This eliminates the need for guides such as pins and splines.

Here, the same reference numerals as in the above-described drawings indicate the same members having the same function, and the detailed description thereof will be omitted since they are substantially the same as described above.

As described above, the nozzle assembly for component mounter according to the present invention can obtain the following effects.

By mounting a flexible disk between the nozzle holder and the outer guide, the nozzle holder can have compliance with respect to the spindle axis, and the nozzle can be accurately guided when the nozzle mechanically moves up and down.

In addition, the flexible disk maintains almost infinite rigidity in the circumferential direction such that the nozzle holder cannot rotate in the axial direction.

In addition, it is possible to implement a straight motion at the same time while preventing the rotation of the nozzle.

In addition, since the straightness of the nozzle can always be maintained during the vertical clearance movement, the component can be mounted on the substrate with high accuracy.

In addition, the device is simple and light, so that the impact of the part is hardly affected even at the time of high speed vertical movement of the nozzle.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (4)

A nozzle holder whose upper portion is supported by the spindle shaft and which fixes the nozzle to the lower portion; An external guide integrated with the spindle shaft and into which the nozzle holder is inserted; And And at least one flexible disk having a central portion fixed to the nozzle holder and an outer circumferential portion fixed to the outer guide and having rotational and horizontal rigidity. The method of claim 1, And the flexible disk includes a buffer opening on the disk surface of the flexible disk to increase the flexibility of the disk. The method of claim 1, And the flexible disk is fixed to the external guide in a structure of a plurality of rows by at least one or more bolts. The method of claim 1, Located between the outer surface of the nozzle holder and the inner surface of the spindle shaft, the nozzle assembly for the component mounter, characterized in that it further comprises a bellows to provide an initial pressure to the flexible disk and seal the gas.

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