KR20040110154A - Mechanism for driving nozzles of chip mounter - Google Patents

Abstract

PURPOSE: An apparatus is provided to reduce the weight of a head assembly by driving a plurality of spindle shafts through the use of a single actuator, and eliminate or reduce phase differences between spindle shafts. CONSTITUTION: An apparatus comprises a frame(160), a first rotating member(110), an actuator(100), a second rotating member(120), a first power transmission unit(130), and a second power transmission unit(140). A plurality of spindle shafts(15) with nozzles(30) are arranged in the frame such that the spindle shafts are rotatable. The first rotating member is arranged at one side of the frame, and has a first coupling portion(112) arranged eccentrically from a rotating shaft. The actuator rotates the first rotating member. The second rotating member is arranged at the other side of the frame, and has a rotating shaft arranged in parallel to the rotating shaft of the first rotating member. The second rotating member has a second coupling portion(122) arranged eccentrically from the rotating shaft of the second rotating member. The first power transmission unit transmits rotating force of the first rotating member to the second rotating member. The second power transmission unit includes a ring gear portion(146) contacting a certain part of a pinion(156), a third coupling portion(142) coupled to the first coupling portion, and a fourth coupling portion(144) coupled to the second coupling portion.

Description

Mechanism for driving nozzles of chip mounter

The present invention relates to a nozzle drive mechanism for a component mounter, and more particularly, to a nozzle drive mechanism for a component mounter having an improved structure for rotationally driving a nozzle of the component mounter head assembly.

The component mounter is a core equipment of the component mounting assembly equipment for mounting a component on a printed circuit board (PCB). The component mounting equipment receives various components from the component supply machine and transfers them to the mounting position of the printed circuit board, and then mounts them on the printed circuit board.

In general, the component mounting unit includes a feeder unit for supplying mounting components, a conveyor unit for conveying a printed circuit board to be worked on, and a head assembly for picking up mounting components from the feeder unit in order and mounting them on a printed circuit board.

Among them, the head assembly includes a frame, a spindle shaft installed on the frame to move up and down, a nozzle installed at one end of the spindle shaft to mount and mute a component, and mounted on the frame to lift the spindle shaft. A lift drive unit, a control unit for guiding mounting and detachment of the component at the correct position, and a nozzle drive mechanism for integrally rotating the spindle axes.

Recently, a plurality of nozzles are installed in the head assembly to increase the efficiency of component mounting. However, when an actuator for driving the nozzles is used to rotate the nozzles, there is a problem in that the volume of the head assembly is increased or the weight is increased.

In order to solve the above problem, recently, one actuator tends to rotationally drive a plurality of nozzles.

As a related art, the nozzle drive mechanism for a component mounter disclosed in Japanese Patent Laid-Open No. 8-316698 is shown in FIG. As shown, a plurality of spindle shafts 15 are rotated by one actuator 10 and belts 12 and 13.

Specifically, the nozzle is mounted at one end of each spindle shaft 15. The plurality of spindle shafts 15 are arranged in a row to allow rotation. Drive pulleys 16 and idle pulleys 17 are installed on the outer circumferential surfaces of the spindle shafts 15 up and down, respectively, and the installation positions of the drive pulleys 16 and idle pulleys 17 of the adjacent spindle shafts are mutually up and down. The opposite is true. The power transmission mechanism includes an actuator 10 and a pair of upper and lower belts 12 and 13 which rotate by the driving of the actuator. The belts are then connected to a drive pulley 16 and idle pulley 17 of the spindle shaft, respectively.

Accordingly, when the actuator 10 is driven, the rotational force is transmitted to the driving pulley 16 and the idle pulley 17 through the belts 12 and 13 so that the spindle axes connected with the driving pulley rotate together.

Fig. 2 shows a nozzle drive mechanism for a component mounter disclosed in Japanese Patent Laid-Open No. Hei 8-330791 as another prior art. Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

2, the shape of the spindle shaft 15, the drive pulley 16, and the idle pulley 17 is the same as the embodiment of the invention described in Japanese Patent Application Laid-Open No. 8-316698, but it has two rotary drive sources. It is characterized by having the actuators 20 and 21. Each of the actuators 20, 21 is connected to a separate belt 22. Thus, one of the actuators 20, 21 is connected to the drive pulley 16 of the spindle shaft by the belt, and the other of the actuators 20, 21 is connected to the idle pulley 17. Thus, when the actuators 20 and 21 are actuated, the spindle axes 15 associated with the nozzles are rotated independently into two groups, respectively. That is, while the nozzles of one group are mounting the component, the nozzles adsorbing the other group of components are rotated to determine the rotation direction of the component mounted thereto.

However, when the spindle axes are simply connected in series by the belt according to the above-mentioned prior art, a phase difference in rotation of the spindle axis occurs due to the elasticity of the belt itself or the slippage between the belt and the pulley. If the belts are superimposed in order to reduce this phase difference, a larger capacity actuator is required, which increases costs and makes maintenance and maintenance of the actuator difficult. In addition, the belt is a rubber material is worn by the friction with the pulley, there is a problem that must be replaced regularly.

The present invention solves the above problems, and provides a nozzle drive mechanism for a component mounter in which a plurality of spindle shafts equipped with nozzles are simultaneously rotated by one actuator, without or at least reduced in phase difference due to rotation of the spindle shafts. It aims to do it.

1 is a plan view showing a nozzle drive mechanism for a conventional component mounter,

2 is a plan view showing another conventional nozzle drive mechanism for a component mounter,

3 is a perspective view of a nozzle driving mechanism for a component mounter according to an embodiment of the present invention;

4 is a cross-sectional view taken along line IV-IV of FIG. 3.

Explanation of symbols on major parts of partial drawings

15: spindle axis 100: actuator

110: first rotating member 112: first coupling portion

120: second rotating member 122: second coupling portion

130: first power transmission means 140: second power transmission means

142: third coupling portion 144: fourth coupling portion

146: ring gear 156: pinion

The present invention to achieve the above object,

A frame in which the spindle shaft having a pinion and a component mounting nozzle is rotatably installed; A first rotating member rotatably installed at one side of the frame, the first rotating member having a first coupling part eccentric from the rotating shaft; An actuator capable of rotating the first rotating member; A second rotating member rotatably installed on the other side of the frame and having a rotating shaft parallel to the rotating shaft of the first rotating member, the second rotating member having a second coupling portion eccentric from the rotating shaft; First power transmission means for transmitting the rotational force of the first rotating member to the second rotating member; And a second power transmission means having a ring gear portion inscribed with a portion of the pinion, a third coupling portion coupling with the first coupling portion, and a fourth coupling portion coupling with the second coupling portion. Provide a nozzle drive mechanism.

Eccentric length from the center of rotation of the first rotating member to the first coupling portion, eccentric length from the center of rotation of the second rotating member to the second coupling portion, and the difference between the radius of the ring gear portion and the radius of the pinion Are all the same, and the rotational force transmission radius of the first and second rotating members is preferably the same.

Meanwhile, one of the first coupling part and the third coupling part may have a shape of a protrusion, and the other may have a shape of a hole in which the protrusion is accommodated, and one of the second coupling part and the fourth coupling part may also be It may have a shape of a protrusion and the other may have a shape of a hole in which the protrusion is accommodated.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, a nozzle mounting mechanism for a component mounter according to an exemplary embodiment of the present invention includes a frame 160, a first rotating member 110 installed at one side of the frame 160, and the frame ( The second rotating member 120 installed on the other side of the 160, the first power transmitting means 130 transmitting the rotational force of the first rotating member 110 to the second rotating member 120, and the first rotation; A part of the ring gear portion 146 mounted to the second power transmission means 140 having a ring gear portion 146 coupled to the member and the second rotating member, and a spindle shaft 15 on which the nozzle 30 is mounted. And a pinion 156 in contact with it.

In more detail the configuration, the nozzle 30 for mounting and detaching the component is coupled to one end of the spindle shaft 15. The spindle shaft 30 is installed on the frame 160 to be rotatable. Since the spindle shaft 15 is rotatably supported by the frame 160, a bearing is preferably interposed between the frame 160 and the spindle shaft 15.

One side of the frame 160 is provided with a first rotating member 110 driven by the actuator 100. The first rotating member 110 is provided with a first coupling portion 112, the first coupling portion 112 is located eccentrically from the rotation axis of the first rotating member 110, the second power transmission means It is coupled with the third coupling portion 142 formed on one side of the 140.

The other side of the frame 160 is rotatable, and a second rotating member 120 having a rotating shaft parallel to the rotating shaft of the first rotating member 110 is installed. The second rotary member 120 also has a second coupling portion 122 eccentric from the rotation axis, the second coupling portion 122 is a fourth coupling portion formed on the other side of the second power transmission means 140 144 is combined.

3 illustrates a pulley as an embodiment of the first rotating member 110 and the second rotating member 120, but is not limited thereto. For example, a machine capable of rotating by receiving power such as a gear may be used. The element may be adopted as the first rotating member 110 and the second rotating member 120.

At this time, the first rotating member 110 and the second rotating member 120 is preferably spaced apart by the same distance in the opposite direction from the center of gravity of the second power transmission means 140, whereby This is because the two power transmission means 140 can receive the load uniformly.

The rotational force of the first rotating member 110 is transmitted to the second rotating member 120 through the first power transmission means 130. 3 illustrates a belt as the first power transmission means 130, but is not limited thereto. For example, a belt may be adopted as the first power transmission means 130 if it is a device for transmitting rotational force such as a chain. have. If the first power transmission means 130 is a belt, the thread is formed on the outer surface of the first rotating member 110, the outer surface of the second rotating member 120, and the inner surface of the belt.

The second power transmission means 140 has a third coupling portion 142 coupled to the first rotating member 110, a fourth coupling portion 144 coupled to the second rotating member 120, and a ring gear portion ( 146). The ring gear portion 146 has threads on an inner surface thereof so that some of the threads are inscribed with the pinion 156.

The difference between the radius R of the ring gear and the radius P of the pinion is the eccentric distance G from the rotational axis of the first rotating member 110 to the first coupling portion 112, and the second rotation. The ring gear 146 and the pinion 156 may be accurately engaged with each other by being equal to the eccentric distance J from the rotation axis of the member 120 to the second coupling part 122.

In addition, the eccentric distance (G) from the rotating shaft of the first rotating member 110 to the first coupling portion 112, and from the rotating shaft of the second rotating member 120 to the second coupling portion 122 The eccentric distance (J) should be equal to each other to enable the circular motion of the second power transmission means (140).

Meanwhile, one of the first coupling part 112 and the third coupling part 142 may have a shape of a protrusion, and the other may have a shape of a hole in which the protrusion is accommodated. In addition, one of the second coupling part 122 and the fourth coupling part 144 may have a shape of a protrusion and the other may have a shape of a hole in which the protrusion is accommodated. In this case, since the friction between each of the first rotating member 110 and the second rotating member 120 and the second power transmission means 140 is preferably small, it is preferable that a bearing is interposed between the protrusion and the hole. .

Hereinafter, the operation of the nozzle drive mechanism for the component mounter according to the embodiment of the present invention will be described.

The first rotating member 110 connected to the rotating shaft of the actuator by the actuator 100, and the second rotating member 120 connected to the first rotating member 110 and the first power transmission means 130. ) Is rotated in the same phase. At this time, the rotational force transmission radius of the first rotating member 110 and the second rotating member 120 should be the same, the first rotating member 110 and the second rotating member 120 can be rotated at the same cycle with each other. Here, the rotational force transmission radius means a distance from the rotational axis to the surface in contact with the first power transmission means 130. That is, for example, when the first rotating member 110 and the second rotating member 120 is a pulley, and the first power transmission means 130 is a belt, the belt of the pulley from the rotation axis of the pulley It means the distance to the contact surface.

Eccentric distance G from the rotation axis of the first rotating member 110 to the first coupling portion 112, and Eccentric from the second rotating member 120 to the second coupling portion 122 The distance J is the same. For this reason, the first coupling part 112 provided on the first rotating member 110 is coupled to the third coupling part 142 and the second coupling part 122 provided on the second rotating member 120. The second power transmission unit 140 coupled to the fourth coupling unit 144 has a radius of the eccentric distance (G) (J), the non-rotating circular motion. Therefore, the ring gear part 146 formed in the second power transmission means 140 also performs the same non-rotating circular motion.

Due to the circular motion of the ring gear part 146, the pinion 156 inscribed to a part of the threads of the ring gear part 146 performs a rolling rotation motion in a direction opposite to the non-rotational circular motion of the ring gear part 146. As a result, the spindle shaft 15 having the pinion 156 rotates.

When the radius of the ring gear is R, the radius of the pinion is P, the number of teeth of the ring gear is nr, and the number of teeth of the pinion is np. Np) has a relationship such as Nr: Np = 1: (R / P-1) = 1: (nr / np-1).

Therefore, the number of teeth nr of the ring gear 146 and the number of teeth np of the pinion 156 are determined, whereby the amount of rotation of the pinion 156 can be determined. In addition, the rotation angle of the nozzle 30 is adjustable by controlling the rotation amount of the actuator 100, and thus the rotation angle of the component adsorbed by the nozzle 30 can be determined.

According to the present invention, by driving a plurality of spindle axes using one actuator, it is possible to reduce the volume or weight of the head assembly.

In addition, since the spindle axis is rotated by the ring gear portion and the pinion, there is no phase difference or at least reduced between the spindle axes.

Furthermore, there is no need to overlap belts in order to reduce the phase difference between spindle axes, and a small motor can be used, which simplifies maintenance and maintenance.

Although the present invention has been described with reference to the embodiments shown in the 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. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (3)

A frame 160 rotatably mounted with a spindle shaft 15 having a pinion and a component mount nozzle 30; A first rotating member 110 rotatably installed at one side of the frame 160 and having a first coupling part 112 eccentric from the rotating shaft; An actuator (100) capable of rotating the first rotating member (110); A second rotating member rotatably installed on the other side of the frame 160, having a rotating shaft parallel to the rotating shaft of the first rotating member 110, and having a second coupling portion 122 eccentric from the rotating shaft ( 120); First power transmission means (130) for transmitting the rotational force of the first rotating member (110) to the second rotating member (120); And A ring gear portion 146 in contact with a portion of the pinion, a third coupling portion 142 coupled with the first coupling portion 112, and a fourth coupling portion 144 coupled with the second coupling portion 122. And a second power transfer means (140) having a nozzle mounting mechanism for a component mounter. The method of claim 1, Eccentric length (G) from the center of rotation of the first rotating member 110 to the first coupling portion 112, the eccentric length from the center of rotation of the second rotating member 120 to the second coupling portion 122 (J) and the difference between the radius R of the ring gear portion 146 and the radius P of the pinion 156 are all the same, and the first rotating member 110 and the second rotating member 120 are equal to each other. The rotation force transmission radius of the nozzle mounting mechanism for the component mounter is the same. The method of claim 1, One of the first coupling part 112 and the third coupling part 142 has a shape of a protrusion and the other has a shape of a hole in which the protrusion is accommodated, and the second coupling part 122 and the fourth One of the coupling portion 144 has a shape of a projection and the other has a shape of a hole in which the projection is accommodated nozzle drive mechanism for component mounting.