JPH0322078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an apparatus for mounting leadless electronic components on a circuit board.

(b) Prior Art Various types of leadless electronic component mounting devices have been proposed so far. A device that mounts leadless electronic components one by one using a mounting head supported by a type of robot arm (Japanese Patent Application Laid-open No.
54-80558), and those that aim to increase the speed by arranging mounting heads around the periphery of a rotary index table (Japanese Patent Application Laid-open No. 55-24494, 57-
Publication No. 187997, Publication No. 112884 of 1988, Publication of Utility Model Publication No. 112884, No. 57-
No. 4275, No. 57-48672, etc.) are typical types of so-called one-by-one mounting devices.
By the way, recently, the variety of leadless electronic components has increased, and in addition to the flat (square) shape and cylindrical (round) shape, the size of flat components varies from 2 mm to just over 7 mm in length and width. 1mm to 4
It has come to show a rich variety, with the number being just over mm. Naturally, all of these leadless parts are required to be automatically installed.

(c) Problems to be Solved by the Invention When mounting a wide variety of leadless electronic components onto circuit boards, using a robot arm type mounting device would require a number of mounting devices with different mounting head types to be lined up. It becomes something you have to do. If it is a rotary index table type mounting device, it is possible to handle many types of parts with one device by arranging various types of mounting heads in a row. In this case, an unsuitable mounting head must be allowed to pass by until a suitable mounting head for the component arrives, resulting in loss time. An object of the present invention is to solve this problem and provide a device that can efficiently mount many types of leadless electronic components with one device.

(d) Means for Solving the Problems In the present invention, a group of work stations including a component supply station and a component mounting station are placed in the circumferential area of the support whose index is rotated by an index shaft, and a group of work stations including a component supply station and a component mounting station are placed in the region around which the index of the support is rotated. A plurality of suction tool holders, each facing a different work station, are rotatably coupled to the support. Each suction tool holder is arranged with one suction tool group consisting of an assortment of a plurality of types of suction tools. The suction tools protrude radially from the periphery of the suction tool holder, and one of them is directed directly downward as the suction tool holder rotates. Further, the support body shall be caused to move up and down by a lifting device.

(E) Function When installing, select one of the suction tools to be used from the group of suction tools for each suction tool holder, depending on the part to be installed next. Selection is made by rotating the suction tool holder, and the desired suction tool is directed directly downward. When the support is lowered by the lifting device, the downward suction tool suctions components at the component supply station and mounts components at the component mounting station.

(F) Embodiment In the figure, reference numeral 1 denotes a hollow index shaft that rotates in 90° increments about a vertical axis, and a support 2 is connected to the lower end of the shaft. The support 2 is constituted by four horizontal arms 3 which project radially from the index shaft 1 at 90° intervals and rotate in a horizontal plane. A total of four suction tool holders are arranged around the periphery of the support body 2 at the same angular intervals as the index rotation angle. The suction tool holder is constituted by a disk-shaped suction tool holder 4 rotatably coupled to the tip of each arm 3. The suction tool holder 4 is held such that a mounting shaft 5 protruding from one end surface is inserted into the tip of the arm 3 so as to be rotatable around a horizontal axis. A pin 6 is inserted into the arm 3 from above, and is engaged with an annular groove 7 formed in the mounting shaft 5 to secure the suction tool holder 4.
to prevent it from falling out. A click stop device is provided for the suction tool holder 4 in order to dynamically stop its rotation every 90 degrees. and a ball spring 9 installed in the arm 3 to engage with the recess 8. One suction tool group is arranged in each suction tool holder 4. In the embodiment, each suction tool group consists of an assortment of suction tools 10, 11, 12, and 13.
The suction tools 10, 11, 12, and 13 have the same external shape at the portion attached to the suction tool holder 4, but have three different shapes at the nozzle portions at the tips. That is, the suction tools 10 and 11 are equipped with the nozzle 29 for small parts, and the suction tool 12 is equipped with the nozzle 30 for large parts, and the suction tool 13 is equipped with the nozzle 30 for large parts. A cylindrical component nozzle 31 is arranged to form a cylindrical component suction tool.

The suction tools 10, 11, 12, and 13 protrude radially from the periphery of the suction tool holder 4 at 90° intervals. Each suction tool can move forward and backward within a certain range, and is normally pushed to the advanced position by the compression coil spring 14. The hollow parts of the suction tools 10, 11, 12, 13 are
4 formed independently from each other inside the suction tool holder 4
It communicates with the book suction tool holder side air intake passage 15 in a ratio of 11:1. Each suction tool holder-side intake passage 15 extends into the mounting shaft 5 and has outlets at 90° intervals around the mounting shaft 5. A support side air intake passage 16 is formed inside the arm 3. The support side intake passage 16 is
It communicates only with the suction tool holder side air intake passage 15 attached to the suction tool which faces directly below. All the support side air intake passages 16 of each arm 3 communicate with the interior of the index shaft 1. A valve device 17 is arranged inside the index shaft 1. Valve device 1
Reference numeral 7 is constituted by a hollow shaft, and the center part serves as an intake passage 18 within the index shaft leading to a vacuum source (not shown). The lower end of the valve device 17 is a valve portion 19 that exerts a suction force on the support side intake passage 16 that has come to a specific position.

Four work stations, . . . are arranged in the circumferential region of the support 2. The work station is a component supply station and the work station is a component placement station. The suction tool holder pivots above each work station and faces another work station with each index revolution. An XY table 21 on which a component tray 20 is mounted is disposed at the component supply station, and an XY table 23 on which a circuit board 22 to be mounted with an electronic component is mounted is disposed at the component mounting station. A selector 24 is arranged at the work station to change the angle at which the suction tool holder 4 is attached to the support 2 as required. The selector 24 is composed of a gear that rotates around a horizontal axis,
A gear portion 25 that meshes with the suction tool holder 4 is formed therein. The component tray 20 holds a large number of electronic components divided into rows according to type. In the example, a flat plate-like small part (hereinafter referred to as a small part) 2
6. Large plate-shaped parts (hereinafter referred to as large parts) 2
7. Three types of cylindrical parts 28 are available.

At the component supply station and component mounting station, the suction tool is used as the work target (component tray 2).
0 and the circuit board 22) is achieved by lowering the support 2. The lowering of the support 2 is caused by a lifting device, but in the embodiment the index shaft 1 itself also serves as the lifting device. The index shaft 1 can be moved up and down by being connected to the up and down cam mechanism in addition to the indexing mechanism.

The above device operates as follows. By the index rotation of the support 2, the suction tool holder 4 sequentially revolves around the work stations, . During the circulation process, as shown in FIG. 4, the support side air intake passage 16 located in the section of the work station, , communicates with the index shaft internal air intake passage 18, and applies suction force to the suction tools facing directly below. It's affecting. When the index shaft 1 enters a rotation stop period and the suction tool holder 4 has settled at each work station, the index shaft 1 is lowered. At the component supply station, a group of downward suction tools (the suction tool 10 in the figure) that is exerting a suction force collides with a target component (the small component 26 in the figure) and sucks it. At the component mounting station, the suction tool (suction tool 12 in the figure) that has carried the electronic components presses against the electronic components on the circuit board 22, adhering the electronic components to the adhesive applied to the circuit board 22 in the previous process. let At both the parts supply station and the parts mounting station, the suction tool that hits the work object is Spring 1.
4 and escape upwards to prevent parts from breaking due to excessive pressure. The valve part 19 continues to operate even when the support body 2 is lowered, but in order to completely separate the electronic components attached to the circuit board 22 from the suction tool, the valve part 19 is moved along the imaginary line in FIG. Rotate it to the position to cut off the suction of the suction tool located at the component mounting station. The valve portion 19 returns to its original position after the support 2 has finished rising.

At the station, the suction tool holder 4 coming from the component mounting station is connected to the selector 24. The suction tool holder 4 connects the suction tool that has just been fitted with an electronic component to the selector 24 with the suction tool facing straight down, but if this suction tool is not suitable for the next planned mounting of the component. ,
The selector 24 rotates to change the angle of the suction tool holder 4 so that the desired suction tool faces directly below. If the suction tool is fine as before, the selector 24 will not rotate.

After completing the work at each work station in this manner, the support 2 is raised and rotated through 90 degrees to move the suction tool holder 4 to the next work station. Although not particularly shown in the figure, an appropriate anti-rotation means is provided between each suction tool and the suction tool holder 4 so that the angle of the electronic components (in the horizontal plane) will not be distorted when the electronic components are sucked and transported. It is a good idea to apply Further, a mechanism for centering and orienting the electronic component with respect to the suction tool may be arranged before the component mounting station, in the working station in the embodiment.

(g) Effects of the Invention According to the present invention, it is possible to select any suction tool suitable for a particular type of part from among the suction tool holders that have come across a particular type of part and use it for transporting the part. Therefore, there is no need to unnecessarily feed the support body in order to match the parts and the suction tool, and the parts can be reliably picked up at each mounting tact. Component suction at the component supply station and component mounting at the component mounting station proceed in the same tact due to the lowering of the support, but at this time, only one suction tool at each station is facing straight down, so it is necessary to No suction tools other than those used may come into contact with components or circuit boards.

[Brief explanation of drawings]

The figures show one embodiment of the device of the present invention, in which Fig. 1 is a perspective view with the main parts cut away, Figs. 2 and 3 are vertical sectional views in different states, and Fig. 4 is a top view with the main parts cut away. It is. In addition, Fig. 3 is A-A in Fig. 4.
It is sectioned at the point , and then expanded. ... component supply station, ... component mounting station, 2 ... support body, 1 ... index shaft (elevating device), 4 ... suction tool holder,
10, 11, 12, 13...Suction tool.

Claims (1)

[Claims] 1. An electronic component mounting device comprising the following components. (a) a support disposed above a group of work stations including a component supply station and a component mounting station so as to be rotatable in a horizontal plane; (b) an index shaft for index rotation of the support; (c) a rotation mechanism for the support; (d) a plurality of suction tool holders, which are coupled together in a manner that allows them to face another work station each time the support is indexed; A suction tool group (e) consisting of an assortment of multiple types of suction tools that protrude radially and one of them faces straight down as the suction tool holder rotates.By causing the support to descend,
An elevating device that uses the downward suction tool to suction components at a component supply station and to mount components at a component mounting station.