JP2517382B2 - Electronic component mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The device of the present invention is used for mounting a surface mount electronic component on a board in an electronic circuit board assembling process.

(B) Conventional technology The number of types of surface mount electronic components has increased with the spread of surface mount electronic components in recent years. In addition to flat (square) and cylindrical (round) shapes, the size of flat components In this case, the length shows a rich variety of 2 mm to 7 mm or more and the width of 1 mm to 4 mm or more. When combining these surface-mounted electronic components to form an electronic circuit, there is no problem if component beams with the same shape can be used, but it is possible to mix flat plates and cylinders, or even if the same flat plate has an extremely large size. When combining different things,
It was necessary to line up a number of mounting devices designed for specific shaped parts to form a series of lines. 55
-112884 and Japanese Patent Laid-Open No. 51-54267 describe an electronic component mounting device in which the suction head is switched depending on the component, but both of these are mounted between the component supply section and the circuit board. The head moves back and forth to transfer electronic components, and it is not suitable for the purpose of mounting a large number of electronic components on one circuit board at high speed.

(C) Problem to be Solved by the Invention The present invention is to provide an electronic component mounting apparatus capable of mounting various types of surface mount electronic components at high speed.

(D) Means for Solving the Problems In the present invention, a plurality of sub-holders are attached to the periphery of the main holder that performs index rotation about the vertical axis so as to be rotatable about the vertical axis. Each sub-holder holds a plurality of types of suction heads so that they can be raised and lowered independently. A selector that changes the mounting angle of the sub holder with respect to the main holder is arranged in the middle of the route from the component mounting station to the component supply station. In addition, the component supply station and the component mounting station act on the suction head selected by the selector and do not change the height of the sub holder, and only the suction head is held by the sub holder as the suction target. Or, an elevating means for approaching the wearing target is provided.

(E) Action The sub holder moves sequentially from the work station to the work station by the index rotation of the main holder. At the component supply station, the selected suction head is lowered by the elevating means to suck the target electronic component. The suction head that has sucked the electronic component moves up and moves to the next work station. When this suction head arrives at the component mounting station, the elevating means lowers it again and transfers the electronic component to the circuit board. After delivering the electronic components, the suction head moves up and moves to the next work station. When this suction head is not suitable for the next electronic component to be handled, the selector changes the angle of the sub holder before reaching the component supply station,
Select another suction head.

(F) Embodiment An embodiment will be described with reference to FIGS. 1 to 5. In the figure, reference numeral 1 is a hollow index shaft which is intermittently rotated by 90 ° about a vertical axis, and a lower end thereof serves as a main holder 2. The main holder 2 is composed of four arms 3 protruding radially from the index shaft 1 at 90 ° intervals. A disc-shaped sub-holder 4 is attached to the tip of each arm 3. The sub holder 4 is mounted on the upper surface of the arm 3 so that the sub holder 4 can be rotated about a vertical axis by a mounting shaft 5 protruding from the upper surface.
Is held in. A click stop device is provided in order to stop the rotation of the sub-holder 4 every 90 ° in a manner that allows it to rotate. This is due to the recesses 6 formed on the upper surface of the sub-holder 4 so as to be lined up at intervals of 90 ° on the same circumference, and the ball springs 7 provided in the arm 3 so as to elastically engage with the recesses. Composed. The sub-holder 4 vertically penetrates this 4
It holds the individual suction heads 8, 9, 10, and 11. Each suction head can move up and down within a certain range, and is normally pushed up to the raised position by the compression coil spring 12. At this raised position, the upper end of each suction head does not project above the upper surface of the sub holder 4 and is not caught by the arm 3. A vertical groove 13 is formed inside the auxiliary holder 4 along the vertical path of each suction head, and a projection 14 from the suction head engages with the vertical groove 13, so that the suction head does not rotate with respect to the auxiliary holder 4. . Each suction head 8, 9, 10, 11 is hollow, and these hollow portions communicate with the four intake passages 15 formed independently inside the sub-holder 4 in a one-to-one relationship. ing. Each intake passage 15 rises through the inside of the mounting shaft 5 and has outlets open around the mounting shaft 5 at 90 ° intervals. Arm 3
An intake passage 16 connected to an intake passage 15 connected to the suction head located on the outermost side when viewed from the index shaft 1 is formed inside. Intake passage 16 is index shaft 1
The valve shaft 17 is arranged here. The valve shaft 17 communicates with a vacuum source (not shown) through an intake passage 18 at the center, and applies a suction force from the valve portion 19 at the lower end to the intake passage 16 that has reached a specific position.

The sub holder 4 has four work stations I, II, II.
Orbit I and IV in sequence. Of the work stations, I is the parts supply station, III is the parts mounting station, and I
V is a head selection station. An XY table 21 on which a component tray 20 is mounted is arranged in the component supply station I, and an XY table 23 on which a circuit board 22 on which a component is to be mounted is mounted is arranged in the component mounting station III.
These work stations I and III are provided with tappet-like elevating means 24 and 25 for lowering the suction head which is located farthest from the index shaft 1. The head selection station IV has a sub holder 4 for the main holder 2
A selector 26 is arranged to change the mounting angle of the as required. The selector 26 is composed of gears whose axes are vertical,
The sub-holder 4 is provided with a gear portion 27 that meshes with it. The component tray 20 holds a large number of components divided into columns for each type. Looking at the parts in terms of shape, there are three types of flat small parts (hereinafter referred to as small parts) 28, large flat parts (hereinafter referred to as large parts) 29, and cylindrical parts 30. Are arranged on the suction heads 8, 9, 10, and 11. That is, the suction heads 8 and 10 have a small component nozzle 31, and the suction head 9 has a large component nozzle 32.
And the nozzles 33 for cylindrical parts are assigned to the suction head 11.

The device operates as follows. With the index rotation of the main holder 2, the auxiliary holder 4 is moved to the work stations I, I.
Orbit I, III and IV in sequence. In the orbiting process, the second
As shown in the drawing, the intake passage 16 located in the section of the work stations I, II, and III communicates with the intake passage 18, and exerts a suction force on the suction heads that are farthest from the center of rotation. In the component supply station I, this suction head (the suction head 9 in FIG. 1) farthest from the center of rotation is pushed down by the elevating means 24, and a component suitable for the nozzle held therein (large component 29 in FIG. 1). ) Is absorbed. After the suction is completed, the elevating means 24 comes out of the sub holder 4, and the suction head that has sucked the component returns to the raised position by the elastic force of the spring 12. At this time, in the component mounting station III, the elevating means 25 pushes the suction head (suction head 10 in FIG. 1) carrying the component from the component supply station I, and the component suctioned (small component 28 in FIG. 1). Is pressed against the circuit board 22. The small component 28 is attached to the substrate 22 by the adhesive applied to the predetermined portion of the substrate 22. In order to completely separate the small component 28 from the nozzle 31, the valve portion 19 is rotated here to the position of the phantom line in FIG. 2 to cut off suction from the suction head 10. Then, the elevating means 25 is pulled up to raise the suction head 10. After the suction head 10 finishes ascending, the valve portion 19 returns to the original position by the time the next sub holder 4 comes to the component mounting station III. After the component suction and component mounting are completed, the index shaft rotates 90 ° and each sub holder 4 moves to the next work station. The sub-holder 4, which has reached the head selection station IV, has the suction head used for component mounting at the component mounting station III at the outermost end as viewed from the center of rotation. When the suction head is not suitable for the next scheduled component mounting, the selector 26 approaches the sub holder 4 and connects to the gear portion 27, and the sub holder 4 is rotated until the suction head is replaced with the required suction head. . After that, the selector 26 is separated from the gear portion 27, and the sub holder 4 is sent to the component supply station I. If it is not necessary to replace the suction head, the selector 26 is not connected to the sub holder 4.

(G) Effect of the Invention According to the present invention, it is possible to handle surface-mounted electronic components of any shape by incorporating a suction head group having a required nozzle shape into one electronic component mounting apparatus. Become. The effects particularly related to the configuration of the present invention are as follows.

The first effect is brought about by a structure in which a plurality of rotatable sub-holders are attached to the main holder that rotates in an index manner, and a plurality of types of suction heads are held in each of the sub-holders. This will be described with reference to FIGS. 6 and 7. FIG. 6 is a simplified version of FIG. 5, and FIG. 7 shows a state in which the same number of suction heads as those of the apparatus of FIG. 6 are arranged at regular intervals so as to draw a single circle on the periphery of the rotary index table. Is shown. Now, when the distances d between adjacent suction heads are set to be the same, it can be understood that the device in FIG. 6 occupies a smaller area as a whole. This is because the suction heads must be arranged on a line with a width of zero in the device of FIG. 7, whereas in the device of FIG. 6, the suction heads have a width in the radial direction of the main holder due to the existence of the auxiliary holder. This is because they can be placed. Further, in the apparatus of FIG. 7, the arrangement interval of the suction heads must match the intermittent movement interval of the rotary index table. On the other hand, in the apparatus of FIG. 6, the problem is that the target suction head appears at the predetermined indexing position, and it does not matter how the suction heads are arranged in the sub-holder. Therefore, the suction heads can be densely arranged at intervals different from the intermittent movement intervals of the main holder, and the number of suction heads can be increased compared to the occupied area.

The second effect is that it is possible to set up a wearing program without loss time. That is, in the case of setting a program for continuously mounting a specific component, for example, a large component, in the case of the apparatus shown in FIG. 6, the large component nozzle 32 may be selected by each sub-holder. This allows large parts to be mounted without breaks. However, in the apparatus shown in FIG. 7, the nozzle for small parts 3 is sucked up after one large part is sucked up and then the nozzle 32 for small parts is held down.
1. The cylindrical component nozzle 33, the small component nozzle 31 and the ones unrelated to the intended work must be stopped at the component mounting station three times, which results in a loss of time. With the device shown in FIG. 6, a mounting program can be freely constructed without causing such a loss.

The third effect is as follows. That is, a certain sub-holder is located at the component supply station and carries out a component picking operation. Another sub-holder is located at a station between the component supply station and the component mounting station, so as to prevent the components from being dropped. Another sub-holder carries out component mounting work at the component mounting station. Still another sub-holder is located at a station between the component mounting station and the component supply station, and is rotated by the selector to switch the suction head. These operations proceed simultaneously when the main holder stops moving. Therefore, the operations which are originally incompatible with each other, such as picking up a component, mounting a component, and selecting a suction head, proceed simultaneously, and the working time is shortened. Further, since the sub-holder arrives at the component supply station in a state where the suction head to be used next is prepared, the component pickup work can be immediately performed.

The following points can be mentioned as the fourth effect. The sub-holder is rotated to select the suction head between the component mounting station and the component supply station, that is, when the suction head does not hold the component. Therefore, the sub holder can be rotated at high speed without worrying about the parts.

The following points can be given as the fifth effect. The main holder carries out an index rotation about a vertical axis, and a plurality of sub holders are attached to the periphery of the main holder so as to be rotatable about the vertical axis. Each sub-holder holds a plurality of types of suction heads, and these suction heads can be raised and lowered independently while being held by the sub-holders. For this reason, the selected suction head can be lowered independently while maintaining the intake state through the main holder and the sub-holder to perform the component suction or component mounting work. There is no need to change the height of the main holder or the height of the sub holder. Since the lifting object has a small mass, it can move quickly and is energy efficient.

[Brief description of drawings]

1 to 5 show one embodiment of the device of the present invention. FIG. 1 is a perspective view with a main part cut away, FIG. 2 is a partial cross-sectional top view of a main holder, and FIG. Half-section top view, 4th
FIG. 5 is a vertical sectional view of a connecting portion between the main holder and the sub holder, and FIG. 5 is a bottom view of the device. FIGS. 6 and 7 are schematic bottom views for explaining the effect of the present invention. 1 ... Index shaft, 2 ... Main holder, I ...
Parts supply station, III ... Parts mounting station, 4 ... Sub holder, 8, 9, 10, 11 ... Suction head,
26 …… selector, 24, 25 …… lifting means

Claims (1)

(57) [Claims] 1. An electronic component mounting apparatus comprising the following components. Index shaft with intermittent rotation around the vertical axis. b. A main holder which is index-rotated about a vertical axis by the index shaft and has a work station group including a component supply station and a component mounting station in a circulation region thereof. c. A plurality of sub-holders that are rotatably connected to the periphery of the main holder about a vertical axis and face a different work station for each index rotation of the main holder. d. A plurality of types of sub-holders are arranged so that they can be raised and lowered independently of each other, and one of them is selected by the rotation of the sub-holder, and the selected one is supplied from the parts supply station. A suction head that handles parts transportation to the mounting station. e. The sub-holder, which is located at a specific work station between the component mounting station and the component supply station, arrives at this work station and is rotated as necessary so that which of the suction heads it holds holds the part. A selector that determines whether to be responsible for. f. The suction heads are arranged in the component supply station and the component mounting station, respectively, and act on the suction head selected by the selector to hold only the suction head on the sub holder without changing the height of the sub holder. An elevating means for approaching a suction target or a mounting target in the state.