JPH0669656B2 - Parts mounting method for automatic assembly equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a component mounting method of an automatic assembly apparatus for automatically mounting components on a printed wiring board or the like.

[Technical background of the invention]

2. Description of the Related Art In recent years, for example, in the assembly process of electronic devices, many automatic assembly apparatuses have been introduced which take out components from a component storage cassette by a manipulator and mount them on a printed wiring board or the like. FIG. 4 shows an example of the configuration of this type of device, and 1 indicates the device base. An XY table 2 as a work stage, a manipulator 3, and a plurality of component storage cassettes 4 in which different kinds of components are stored are arranged on the upper surface of the apparatus base 1. Of these, the manipulator 3 is provided with a chuck 32 that can be moved up and down and swiveled in the direction of arrow A at the tip of a support arm 31. By this chuck 32, a component is taken out from a component storage cassette 4 and placed on the XY table 2. The printed wiring board 5 as the set assembly base is mounted. On the other hand, the component storage cassettes 4 are arranged in a line, and can be moved in the direction of arrow B by a moving mechanism (not shown) while being integrated with each other.

By the way, in the case where components are mounted in this type of apparatus, in the prior art, assuming that the assembly substrate is, for example, the printed wiring board shown in FIG. 5, first, the respective component mounting positions are detected,
Based on the detection result, the component mounting order is set in the order in which the distances between the component mounting positions are short. For example, in the case of FIG. 5, it is set in the order of a, b, c, d, e, f, g, h, i, j. Then, the XY table 2 is driven in accordance with this mounting order to move each component mounting position of the mounting target to immediately below the chuck 32 of the manipulator 3, and the component storage cassette 4 in which the components to be mounted at the component mounting position are stored. The chuck 32 is moved to a position close to the chuck 32, and in each of these states, the manipulator 3 is driven to take out a component from the cassette 4, and the component is mounted at the component mounting position of the printed wiring board 5. . With such a mounting method, the mounting order of the components at each component mounting position is determined in order of increasing distance, so that the moving distance of the XY table 2 becomes the shortest, and as a result, the components can be mounted efficiently.

[Problems of background technology]

However, in recent printed wiring boards, the number of types of components mounted on one board is increasing, and the number of component storage cassettes 4 tends to increase accordingly. Therefore, in the conventional mounting method, the component storage cassette 4 storing the components to be mounted at the respective component mounting positions according to the preset mounting sequence at the respective component mounting positions is provided with the manipulator 3 each time.
Since it has to be moved to a position close to, it takes a lot of time to move the component storage cassette 4, and as a result, the mounting time of each component is increased and the productivity is lowered.

[Object of the Invention]

The present invention provides a component mounting method for an automatic assembly apparatus, which can prevent the movement time of each cassette from increasing even when the number of component storage cassettes increases, thereby shortening the component mounting time and improving productivity. The purpose is to provide.

[Outline of Invention]

In order to achieve the above object, the present invention sets the component mounting order with respect to each component mounting position of the assembly base so that the moving distance of each component storage cassette becomes the shortest prior to component mounting, and Each time the mounting of all the components to the individual assembly base is completed, each of the next assembly bases is adjusted so that the moving distance of each component storage cassette becomes the shortest with reference to the component storage cassette closest to the manipulator at that time. The component mounting order is set with respect to the component mounting position, and the components are mounted in accordance with this setting order.

Example of Invention

FIG. 1 shows a configuration of a circuit portion of an automatic assembling apparatus for carrying out a component mounting method according to an embodiment of the present invention. This circuit includes a central control unit (CPU) 50 composed of a microprocessor. The CPU 50 has a ROM 52 in which a control program for designating control procedures and control contents of the CPU 50 is stored via a bus 51, control data. RAM 53 for storage and multiple input / output ports (I / O) 54,55,56,62
Are connected respectively. Of these, I / O ports 54,5
Reference numerals 5 and 56 are for inputting / outputting input information or output information to / from the key input unit 57, the printer 58 and the disk driver 59, respectively. The input / output port 62 outputs key input information and an image captured by the ITV camera 60 described later to the monitor 63 for display. On the other hand, a manipulator driving circuit 64, a table driving circuit 65 and a cassette moving circuit 66 are connected to the CPU 50 via a bus 51, respectively, and the manipulator 30, the step motor of the XY table 20 and a component storage cassette are connected via these circuits. The drive signal is supplied to the moving mechanism of No. 4.
Reference numeral 60 denotes an industrial television (ITV) camera used for detecting the pattern position of the printed wiring board 5 as the assembly substrate loaded on the XY table 2, and the image signal output from the ITV camera 60. Via the image information input circuit 61
Introduced in U50.

By the way, the CPU 50 has, as its main function, a component mounting control means and a scheduling control means for setting the mounting order. This scheduling control means, prior to the mounting of the components, information on the component mounting position coordinates of the printed wiring board input from the key input unit 57, a correspondence table between the mounting positions and the components, and the component storing cassettes 4 and the storing components. The component mounting order for each component mounting position is set from the correspondence table.

Next, the component mounting method of this embodiment will be described based on the above configuration. Here, for example, as shown in FIG. 2, one printed wiring board 50 has a plurality of (six in the figure) identical wiring patterns.
A case where components are mounted on a so-called multi-chamber printed wiring board in which K0 to K5 are arranged will be described as an example.

First, the operator inputs the positional coordinate information of each component mounting position Q of the reference wiring pattern K0 among the wiring patterns K0 to K5 while observing the monitor 63 with the key input unit 57. At this time, the position coordinate information is obtained with the positioning reference point P of the printed wiring board 50 preset on the XY table 2 as the origin. Next, the operator inputs a correspondence table of the component mounting positions of the reference wiring pattern K0 and the components to be mounted at these mounting positions, and further identifies each component storage cassette 4 and the components to be stored in these cassettes 4. Enter the correspondence table of. Finally, the position coordinate information of the reference positions P0 to P5 set in the wiring patterns K0 to K5 with respect to the origin P is input, and after the input is completed, the end key is operated. On the other hand, CP
U50 is the position coordinate information of each component mounting position Q of the wiring pattern K0, the correspondence table between the component mounting position Q and the mounting component, the correspondence table between each component storage cassette 4 and the storage component, and each wiring pattern K0 to K5. The coordinate information of the reference positions P0 to P5 are input in steps 3a to 3d as shown in FIG. 3 and stored in the RAM 53.

Now, when the necessary information is input, the CPU50
First, in step 3e, the component mounting order among the wiring patterns K0 to K5 is set. This is set so that the distance between the wiring patterns is the shortest from the origin P, and for example, in the case of FIG. 2, the order is K0, K1, K2, K3, K4, K5. Then, when the order setting between these patterns is completed, the CPU50
Next, in step 3f, first, the component mounting order for each component mounting position Q of the wiring pattern K0 is set. This order setting is set so that the movement distance of the component storage cassette 4 for each component mounting becomes the shortest. For example, assuming that the component storage cassettes 4 are arranged in a line and moved in the arrangement direction B as shown in FIG. 4, one by one from the cassette 4s located at one end. The movement operation of the cassette 4 is set so that the cassette 4 is moved, and the component mounting order of each component mounting position Q is set in accordance with the component mounting order determined by the moving order.

Then, when the mounting order for the wiring pattern K0 is set, the CPU 50 next sets the component mounting order for each component mounting position Q of the wiring pattern K1. This setting is based on the component storage cassette 4 that stores the component to be mounted at the last component mounting position among the component mounting positions Q of the arrangement pattern K0. Set to be the shortest. For example, in FIG. 4, the cassette corresponding to the final component mounting position of the wiring pattern K0 is
If it is 4e, this time, the movement operation of the cassette 4 is set so that each of the component storage cassettes 4 is moved one by one starting from this cassette 4e in the opposite direction to the case of the wiring pattern K0, and this movement is performed. The component mounting order for each component mounting position Q of the wiring pattern K1 is set according to the order. Similarly, the CPU 50 selects the wiring patterns K2, K3, K4, K5 according to the mounting order of the wiring patterns set in the step 3e in the steps 3g to 3k, and the wirings for the respective wiring patterns are also the above-mentioned wirings. Similar to the method of setting the mounting order for the pattern K1, each component mounting position Q is set so that the movement distance of the cassette is minimized from the component storage cassette 4 corresponding to the final component mounting position Q of the immediately preceding wiring pattern. Set the component mounting order for.

Then, when the setting of the component mounting order for each component mounting position Q of the previous wiring pattern is completed, the CPU 50 drives the disk driver 59 in step 3l to drive each wiring pattern K0.
The set mounting order for each K5 to K5 is converted into position coordinate information of each component mounting position Q and stored in, for example, a floppy disk.
The conversion into the position coordinate information is performed based on the coordinate information of the reference positions P0 to P5 of the wiring patterns K0 to K5 input in step 3d. Further, the CPU 50 outputs the information of the set mounting order for each of the wiring patterns K0 to K5 to the printer 58 in step 3m to print it out, thereby completing the control for a series of scheduling.

After that, when the operator operates the mounting operation start switch with the printed wiring board 50 loaded in the XY table 2, the CPU 5
0 drives the XY table 2, the manipulator 3 and the component storage cassette 4 in a predetermined procedure for each component mounting position in accordance with the set mounting order, whereby each wiring pattern K0
The component is mounted at each component mounting position Q every K5.

In this way, according to the present embodiment, the component mounting order for each component mounting position Q of each wiring pattern K0 to K5 is set in correspondence with the moving order of each component storage cassette 4, and the mounting sequence for each wiring pattern is set. Since the component storage cassette 4 corresponding to the final component mounting position Q in the previous wiring pattern is set as the starting point, the movement time of the component storage cassette 4 during the mounting operation can be minimized, and thus each wiring The component mounting time for each pattern and the transition time between wiring patterns can be shortened. Therefore, it is possible to significantly reduce the component mounting time as a whole, which can enhance the productivity. Further, the operator only needs to input predetermined necessary information, and the CPU 50 creates the schedule altogether, so that the schedule can be created extremely easily and quickly without error.

The present invention is not limited to the above embodiment. For example, the mounting order of the components with respect to each component mounting position Q is first set so that the moving distance of the XY table becomes the shortest from the distance between the mounting positions, and the component mounted at each component mounting position Q is mounted as described above. In order to minimize the moving distance of each component storage cassette 4 according to the order, for example, the fourth
As shown in the figure, when each cassette is in a line, they are stored in the order of their arrangement, so that each component mounting position Q is set so that not only the movement distance of the cassette but also the movement distance of the XY table is minimized.
You may make it set the component mounting order with respect to. By doing so, it is possible to further shorten the component mounting time and maximize productivity. In the above embodiment, the operator manually inputs the coordinate information of each component mounting position Q of the wiring pattern K0 and the coordinate information of the reference position of each wiring pattern by the key input unit 57.
It is also possible to take an image of a sample printed wiring board with the V camera 60 and detect the above-mentioned coordinate information from the image. In this way, the input items of the operator are reduced, and the burden is further reduced. Further, in the above-mentioned embodiment, the case where the multi-chamfered printed wiring board is applied has been described. However, a normal wiring board in which one wiring pattern is formed on one printed wiring board is used.
The same can be applied to the case where the sheets are automatically loaded into the XY table each time the sheets are loaded. Further, the component storage cassettes are not limited to those arranged in one row and moved in the one-dimensional direction, but those arranged in a plurality of rows and moved in zigzag may be applied. In addition, the structure of the work stage and the manipulator, the structure of the component storage cassette 4 and its moving mechanism,
The number of component mounting positions and the like can be modified in various ways without departing from the scope of the present invention.

〔The invention's effect〕

As described above in detail, according to the present invention, prior to the mounting of the component, the mounting order of the component with respect to each component mounting position of the assembly base is set so that the moving distance of each component storage cassette becomes the shortest. Every time the mounting of all the components to the individual assembly base is completed, the moving distance of each component storage cassette becomes the shortest with reference to the component storage cassette closest to the manipulator at that time. By setting the component mounting order for each component mounting position and mounting the components in accordance with this setting order,
Even if the number of component storage cassettes increases, it is possible to prevent the moving time of each cassette from becoming long, thereby shortening the component mounting time and improving the productivity. Can be provided.

[Brief description of drawings]

1 to 3 are for explaining a component mounting method in an embodiment of the present invention, and FIG. 1 is a block diagram showing a configuration of a circuit portion of an automatic assembly apparatus for carrying out the method, 2 is a plan view showing an example of the structure of a printed wiring board, FIG. 3 is a flowchart showing the control procedure and control contents of the CPU, FIG. 4 is a perspective view showing an example of the structure of the automatic assembly apparatus, FIG. FIG. 6 is a plan view showing an example of a component mounting order set by a conventional component mounting method. 1 ... Device base, 2 ... XY table, 3 ... Manipulator, 4 ... Component storage cassette, 50 ... Printed wiring board, 50 ...
… CPU, K0 to K4 …… wiring pattern, P …… reference point (origin) for positioning the printed wiring board, P0 to P4 …… reference position for each wiring pattern, Q …… component mounting position.

Claims (1)

[Claims] 1. A plurality of component storage cassettes, each of which stores different types of components and is movable with respect to a manipulator, are provided at a plurality of predetermined component mounting positions of an assembly base carried into a work stage. In an automatic assembly device that picks up and mounts a predetermined component from each component storage cassette using a manipulator, prior to component mounting, the component mounting order for each component mounting position on the assembly base is the shortest moving distance of each component storage cassette. So that the movement distance of each component storage cassette becomes the shortest with reference to the component storage cassette closest to the manipulator at that time each time the mounting of the components on one assembly base is completed. A part of an automatic assembling apparatus characterized in that a mounting order of components is set for each component mounting position of the next assembly base. Implementation method.