KR20030021677A - Nozzle assembly of chip mounter head - Google Patents

Abstract

PURPOSE: A nozzle assembly of a head unit of a surface mounter is provided to prevent the folding of a nozzle spring by forming a hole for exhausting a vacuum at a lateral of the nozzle. CONSTITUTION: A nozzle socket(13) is provided with an exhausting hole(13a) on a lateral thereof and a through-hole within the nozzle socket(13) in a longitudinal direction. An upper end of a nozzle(12) is inserted into the through-hole of the nozzle socket(13) and provided with a longitudinal hole on a lateral of the upper end of the nozzle(12). A nozzle pin(17) is inserted into the longitudinal hole by passing through simultaneously the nozzle socket(13) and the nozzle(12). A nozzle spring(14) is installed between the through-hole of the nozzle socket(13) and the upper end of the nozzle(12) to absorb movement of the nozzle(12). A nozzle holder(15) fixes the nozzle socket(13) by inserting the upper end of the nozzle(12) into a lower inserting hole(15a).

Description

Nozzle assembly of chip mounter head

The present invention relates to a nozzle assembly for a surface mounter head, and more particularly, to a nozzle assembly for preventing the folding of a nozzle spring by vacuum suction and reducing an error generated during automatic nozzle conversion.

The surface mounter is a core equipment of the surface mount assembly equipment for mounting a component on a printed circuit board. The surface mounter is a device that is mounted on a printed circuit board after receiving various components from a component supplyer and transferring them to the mounting position of the printed circuit board.

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

The general mounting procedure of surface mounter is as follows.

First, the printed circuit board is moved to the mounting position of the surface mounter using a conveyor. Then, the head of the surface mounter is moved to the pick-up position of the feeder.

Second, a vacuum is formed at the nozzle end by using the vacuum generator attached to the head. At this time, the degree of vacuum is adjusted using the valve of the vacuum generator. The head is then moved vertically downward to adsorb the feeder's components to the nozzle end using the vacuum already formed.

Third, the parts adsorbed at the nozzle end are recognized by the vision camera and the vision system, and the position and rotation angle are recognized, and the servo motor is moved to the mounting position on the printed circuit board.

Fourth, the parts arriving at the mounting position are placed on the printed circuit board to release the vacuum to form compressed air at the nozzle end, and the parts are mounted on the printed circuit board.

Referring to FIG. 1, a nozzle assembly 1 provided in a conventional surface mounter head unit includes a nozzle 2 for adsorbing a component on a printed circuit board, and a nozzle holder 5 coupled to the nozzle holder 5. A nozzle socket 3, a vacuum spring is formed inside the nozzle 2, the nozzle spring (4) for the buffering action when the component is adsorbed, and the nozzle holder (5) for holding the nozzle socket (3) fixed ).

The nozzle assembly 1 of the surface mounter head portion adsorbs components by the vacuum generated by the vacuum generator, and releases the vacuum after the absorbed components are moved to the mounting position of the printed circuit board by the servo motor. By supplying the compressed air to the nozzle, the component is mounted to the mounting position on the printed circuit board by using the compressed force of air.

The nozzle assembly of the surface mounter head portion may adjust the degree of vacuum through the valve of the vacuum generator, but not while driving the equipment. The surface mounter has a function to automatically convert nozzles according to parts during operation of the equipment, and when mounting all parts while changing nozzles with the same head, mounting errors between large or small parts may occur due to vacuum pressure. In order to minimize the impact of feeder and parts, the elastic force of the nozzle spring should be reduced.If the vacuum pressure is greater than the elastic force, the nozzle spring is folded after pick-up, causing component recognition and mounting error. The problem is that pickup of parts is impossible. In addition, due to the distance between the vacuum generator and the nozzle end and the compression of air during the vacuum release, a delay time of about 40 m / s occurs after the signal is released. It gives a delay of about / s but is not a fundamental solution.

In addition, when the shock absorber is attached to the nozzle assembly in order to reduce the impact generated on the part when the parts are absorbed, when the shock absorber is attached only to the nozzle, an error of the vertical position occurs when switching the automatic nozzle, and the shock absorber is attached only to the holder In the case of attachment, the amount of impact given to the feeder at the time of pick-up is increased and the elastic force cannot be changed according to the shape of the part.

The present invention is to solve the problems as described above, by forming a hole in the nozzle side to prevent the folding of the nozzle spring by vacuum suction, to reduce the delay time required for releasing the vacuum, and to provide a buffer only to the nozzle In this case, an object of the present invention is to provide a nozzle assembly for a surface mounter head to prevent errors occurring during automatic nozzle conversion.

1 is a cross-sectional view of a nozzle assembly of a conventional surface mounter head portion,

2 is a cross-sectional view of the nozzle assembly of the surface mounter head portion according to an embodiment of the present invention;

3 is a cross-sectional view showing a state in which the nozzle spring of the nozzle assembly of FIG.

4 is a cross-sectional view of the nozzle socket,

5 is a cross-sectional view showing a state in which the nozzle holder and the head connection portion are connected.

<Description of Symbols for Major Parts of Drawings>

2, 12 ... Nozzles 3, 13 ... Nozzle sockets

13a ... exhaust hole 13b ... pinhole

4, 14 ... Nozzle spring 5, 15 ... Nozzle holder

15a ... insert hole 16 ... Holder spring

17 ... Nozzle pin 18 ... Connection pin

19.Head connection

The nozzle assembly of the surface mounter head portion of the present invention for achieving the above object comprises: a nozzle socket having at least one exhaust hole formed in the side surface and a through hole formed in the longitudinal direction thereof; A nozzle having an upper end inserted into a through hole of the nozzle socket and having a hole formed in a longitudinal direction at a side thereof; A nozzle pin inserted through the nozzle socket and the nozzle at the same time to be inserted into the hole in the longitudinal direction to define a vertical movement of the nozzle inserted into the nozzle socket; A nozzle spring disposed between the through hole of the nozzle socket and an upper end of the nozzle to cushion the rise of the nozzle; And a nozzle holder for fixing the nozzle socket by inserting the upper end of the nozzle socket into the lower insertion hole.

The apparatus may further include a holder spring connected between an upper part of the nozzle holder to hold the nozzle holder and a holder groove formed in the upper part of the nozzle holder to cushion the rise of the nozzle holder. .

In addition, when a part is vacuum-adsorbed to the nozzle, a part of the air sucked through the nozzle is discharged through the longitudinal hole of the nozzle and the exhaust hole of the nozzle socket.

Hereinafter, the nozzle assembly of the surface mounter head unit according to the 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 of the surface mounter head unit according to the exemplary embodiment of the present invention includes a nozzle socket 13 having a through hole formed in a longitudinal direction therein, and a through hole 13c of the nozzle socket. A nozzle 12 into which the upper end portion 12a is inserted, and a nozzle pin 17 for simultaneously penetrating and fixing the nozzle 12 and the nozzle socket 13 are provided. A nozzle spring 14 is installed between the through hole 13c of the nozzle socket and the upper end portion 12a of the nozzle to buffer the nozzle. A nozzle holder 15 into which the nozzle socket 13 is inserted into the insertion hole 15a is provided.

Referring to FIG. 4, the nozzle socket 13 has at least one exhaust hole 13a formed at a side thereof. The vacuum pressure generated by the vacuum generator is exhausted through the exhaust hole 13a to adjust the vacuum pressure. In addition, it is possible to adjust the vacuum pressure by changing the size of the exhaust hole (13a). In addition, a pinhole 13b is formed in the nozzle socket 13 to allow the nozzle pin 17 to be fitted therein. And the upper end portion 13e of the nozzle socket 13 is made in the same shape as the insertion hole (15a) of the nozzle holder to be inserted into the insertion hole (15a) of the nozzle holder (15). That is, the upper end portion 13e of the nozzle socket is processed into a tapered shape.

The outer diameter of the nozzle 12 is processed to have the same diameter as the through hole 13c of the nozzle socket 13. The nozzle 12 also has a nozzle through-hole 12c formed therein. The nozzle 12 is inserted into the through hole 13c formed in the nozzle socket 13. However, since the nozzle spring 14 is interposed between the nozzle 12 and the nozzle socket 13, the nozzle is not completely inserted into the nozzle socket. The nozzle spring 14 is interposed between the nozzle 12 and the nozzle socket 13 to prevent sudden impact of the component upon adsorption of the component due to the generation of vacuum pressure. A rectangular hole 12b is also formed in the side surface of the nozzle 12. In the hole 12b, the nozzle pin 17 penetrating the pinhole 13b formed on the side surface of the nozzle socket 13 is fitted into the nozzle 12. The vacuum pressure generated inside the nozzle is exhausted to the outside through the exhaust hole 13a formed on the side of the hole 12b and the nozzle socket 13.

When the vacuum is generated inside the nozzle by the vacuum generator, the components can be sucked by the vacuum pressure. The nozzle spring 14 is interposed between the nozzle 12 and the nozzle socket 13 to prevent a sudden impact on the component during the adsorption of the component. Referring to FIG. 3, the nozzle spring 14 may be contracted only by the vertical length of the rectangular hole 12b by fitting the nozzle pin 17 through the rectangular hole 12b formed at the side of the nozzle. Make sure Therefore, the nozzle spring 14 is prevented from contracting a lot. In addition, the nozzle 12 is prevented from popping out of the nozzle socket 13 by the restoring force of the nozzle spring 14 when the vacuum pressure is released. That is, the nozzle 12 is prevented from protruding from the nozzle socket 13 by engaging the nozzle pin 17 in the upper portion 12d of the edge of the hole 12b. An exhaust hole 13a is formed in the side surface of the nozzle socket 13 to prevent the nozzle spring 14 from being folded by a strong vacuum pressure when the component is adsorbed. That is, the vacuum pressure is lowered by the air being exhausted through the exhaust hole 13a.

Referring to FIG. 5, an insertion hole 15a is formed in the nozzle holder 15. The insertion hole 15a has the same shape as the upper end 13e of the nozzle socket 13 so that the upper end 13e of the nozzle socket 13 can be inserted. Spring grooves 15c are formed in the upper end portion 15b of the nozzle holder. A head connecting portion 19 for holding the nozzle holder 15 is connected to the upper end portion 15b of the nozzle holder. The connecting pin 18 connecting the nozzle holder 15 and the head connecting portion 19 passes through the rectangular connecting hole 19c formed at the side of the nozzle holder 15 and the side of the head connecting portion 19. Fix them. The head connecting portion 19 has a first air passage 19a formed therein, and a second air passage 19b having a diameter larger than the outer diameter of the upper end portion 15b of the nozzle holder is formed downward from the interruption thereof. do. A holder spring 16 is installed between the spring groove 15c and the second air passage 19b. This can prevent errors occurring in the z-axis motor during automatic conversion of the nozzle 12 when the shock absorber is attached only to the nozzle 12.

Here, the same reference numerals as in the above-described drawings refer to the same member having the same function, and are substantially the same as described above, and thus detailed description thereof will be omitted.

As described above, the nozzle assembly of the surface mounter head portion according to the present invention forms a hole through which the vacuum is exhausted to change the vacuum for each nozzle, thereby lowering the vacuum pressure during mounting of small parts, and thus reducing the vacuum pressure even at a low spring force. There is an advantage in that the pick-up error of the small parts is improved by preventing the folding of the nozzle spring.

In addition, there is an advantage in that the mounting speed of the component is improved by reducing the delay time required for vacuuming by forming holes.

In addition, by attaching a shock absorber to both the nozzle and the nozzle holder, there is an advantage of preventing the occurrence of an error during automatic nozzle switching that occurs when the shock absorber is applied to only one side.

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 (3)

At least one exhaust hole formed at a side thereof and having a through hole formed in a longitudinal direction thereof; A nozzle having an upper end inserted into a through hole of the nozzle socket and having a hole formed in a longitudinal direction at a side thereof; A nozzle pin inserted through the nozzle socket and the nozzle at the same time to be inserted into the hole in the longitudinal direction to define a vertical movement of the nozzle inserted into the nozzle socket; A nozzle spring disposed between the through hole of the nozzle socket and an upper end of the nozzle to cushion the movement of the nozzle; And a nozzle holder for fixing the nozzle socket by inserting the upper end of the nozzle socket into the lower insertion hole. The method of claim 1, And a holder spring connected between an upper part of the nozzle holder to hold the nozzle holder and a holder groove formed in the upper part of the nozzle holder to cushion the movement of the nozzle holder. Nozzle Head Assembly. The method of claim 1, And a part of the air sucked through the nozzle when the part is vacuum-adsorbed to the nozzle through a longitudinal hole of the nozzle and an exhaust hole of the nozzle socket.