JP3238943B2 - Parts assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component assembling method for performing a predetermined operation for assembling a chip component on a printed circuit board.

[0002]

2. Description of the Related Art A prior art of this kind is disclosed in Japanese Patent Application Laid-Open No. 3-160794 filed by the present applicant.

In this method, chip components are mounted on a printed circuit board to which cream solder or an adhesive as a coating agent has been applied in advance.

[0004] However, if there is no coating agent that should be applied on the substrate, the chip components are not mounted even if the mounting operation is performed, and the substrate becomes defective. In addition, mounting time and parts were wasted.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to detect a coating agent on a substrate to detect a substrate which does not need to perform subsequent operations at an early stage.

[0006]

Therefore SUMMARY OF THE INVENTION The present invention is In the part assembly method for performing predetermined work to assemble the chip components on a printed circuit board, the group in the screen printing machine
The presence / absence of a coating material screen-printed on a plurality of areas on a plate is detected for each area by a coating material presence / absence detection device.

In a component assembling method for performing a predetermined operation for assembling a chip component on a printed circuit board,
The presence or absence of the coating material applied to the plurality of areas on the substrate by the coating device is detected for each area by the coating material presence / absence detection device.

[0008]

From the above, the presence or absence of a coating agent on a printed circuit board screen-printed by a screen printing machine is determined by the presence of the coating agent.
It is detected by the non-detection device for each area on the printed circuit board .

[0009] The presence or absence of the coating material applied by the coating device is determined by a coating material presence / absence detection device in each area on the printed circuit board.
It is detected every time .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

(1) A screen printing machine constituting a component mounting line, and a coating agent having a desired pattern such that chip components are mounted on the upper surface of a printed board (2) conveyed from an upstream device (not shown). Cream solder is applied.

Reference numeral (3) denotes a mounting table on which the substrate (2) is mounted and the substrate (2) is suction-mounted on the upper surface by a vacuum pump (not shown).

[0014] (4) is a moving table provided below the mounting table (3), and the mounting table (3) is moved by moving the moving table (4). That is, the mounting table (3) is moved up and down by the up and down movement of the cylinder (5) that moves the moving table (4) up and down.

A screen (6) comprises a screen plate (7) formed in a desired circuit pattern and a screen frame (8) surrounding the plate (7).

(9) moves the screen plate (7) of the screen (6) while pressing it against the substrate (2), and applies the cream solder supplied on the screen plate (7) to the substrate (2). A pair of squeegees to be applied to the squeegee.

(10) The substrate (2) is mounted on the mounting table (3).
And (11) is a discharge conveyor.

Reference numeral (50) denotes a coating agent presence / absence detecting device for detecting whether or not screen printing by a screen printing machine has been correctly performed. The upper surface of the substrate (2) on the discharge conveyor (11) is imaged by a CCD camera, for example. The CCD camera is mounted movably in the X and Y directions above the conveyor (11), but may be fixed. Alternatively, the presence or absence of the coating agent may be detected by irradiating ultrasonic waves.

A RAM as a storage device (not shown) stores various data, and also stores data on a coating position (area) for each substrate (2) to be handled.

A ROM as a storage device (not shown) stores a coating operation program.

A CPU (not shown) as a control device controls the screen printing machine (1) according to various data relating to the coating operation.

The I / O interface (not shown) includes:
The coating agent presence / absence detection device (50) is connected.

The RAM, R
The OM, CPU, and I / O interface are connected.

(12) is an application device for applying an adhesive as an application agent to the substrate (2).

(13) An XY table on which the substrate (2) conveyed by the supply conveyor (14) is placed.
The XY movement is performed by the axis motor (15) and the Y axis motor (16).

An adhesive applying unit (17) for applying an adhesive to the substrate (2) is supported by a cam lever (20) via a roller receiver (18) and a roller (19). Reference numeral (21) denotes a cam whose arc diameter changes for each rotation angle, for example, and holds the cam lever (20) via a cam follower (22) provided on the cam lever (20).

Reference numeral (23) denotes a drive motor for rotating the cam (21). When the cam (21) is rotated by the motor (23), a fulcrum provided at the other end of the roller (19) of the cam lever (20). The cam lever (20) swings up and down around the shaft (24) as a fulcrum. The adhesive application unit (17) moves up and down by the vertical swing of the cam lever (20). The adhesive application unit (17) will be described.

(25) is a coating nozzle for discharging the adhesive to apply the adhesive to the substrate (2), and (26) is a syringe connected above the nozzle (25) and storing the adhesive. . (27) is an air tube for sending compressed air for discharging the adhesive from the nozzle (25).

(28) is a nozzle holder for holding the nozzle (25), and the nozzle (25) is a nozzle holding plate (29).
And it is attached to the nozzle attachment piece (31) below the nozzle holder (28) by a screw (30).

Reference numeral (32) denotes a spring for holding the syringe (26) in the nozzle holder (28).

(33) is a discharge conveyor.

A RAM as a storage device (not shown) stores various data.

A ROM (not shown) as a storage device stores a coating operation program.

A CPU (not shown) as a control device controls the coating device (12) according to various data relating to the coating operation.

The RAM, R
The OM and the CPU are connected.

A component mounting device (35) mounts chip components (not shown) on the substrate (2).

An XY table (36) on which the substrate (2) conveyed by the supply conveyor (37) is placed.
The XY movement is performed by the axis motor (38) and the Y axis motor (39).

Reference numeral (40) denotes a rotary disk which is intermittently rotated by a drive source (not shown). At its lower end, a number of suction heads (41) for picking up chip components from a component supply device (not shown) are arranged.

(42) is a discharge conveyor.

(60) is a coating device (1) which is an upstream device.
The upper surface of the substrate (2) on the supply conveyor (37) is imaged by, for example, a CCD camera by a coating agent presence / absence detection device that detects whether or not the coating operation according to 2) is performed correctly. The CCD camera is mounted movably in the XY direction above the conveyor (37), but may be fixed. Alternatively, the presence or absence of the coating agent may be detected by irradiating ultrasonic waves.

The RAM serving as a storage device (not shown) stores various data, and also stores data on the coating position (area) for each substrate (2) to be handled.

The ROM as a storage device (not shown) stores a mounting operation program.

A CPU (not shown) serving as a control device controls the component mounting device (3) according to various data related to the mounting operation.
5) is controlled.

The I / O interface (not shown) includes:
The coating agent presence / absence detection device (60) is connected.

The RAM, R
The OM, CPU, and I / O interface are connected.

The operation will be described below.

First, the mounting table (3) is connected to the supply conveyor (1).
0) below the conveyor level and the conveyor (10)
When the substrate (2) conveyed from the upstream device is placed above the mounting table (3), the conveyor (10) is stopped.

Next, the mounting table (3) is raised above the transport level by the cylinder (5), and the substrate (2) is mounted on the mounting table (3) by suction.

Then, one of the squeegees (9) is lowered, and the cream solder supplied on the screen plate (7) is perforated on the screen plate (7) as it moves , for example, rightward in FIG. It is applied on the substrate (2) through the opening.

After the printing is completed, the mounting table (3) is released from suction, the cylinder (5) lowers the table (3) below the transport level, and the discharge conveyor (11) discharges the substrate (2). You.

The substrate (2) on the conveyor (11) is imaged from above by a CCD camera of the coating material presence / absence detecting device (50). That is, the camera is moved XY to the first imaging area on the substrate (2) stored in the RAM. It is detected whether or not the cream solder is correctly applied to the pattern in the imaging area (the position to be applied). At this time,
If the position and area of the applied cream solder with respect to the position data and area data of the pattern stored in the RAM satisfy predetermined conditions, it is determined that the pattern solder is normal. Hereinafter, similarly, the presence or absence of the cream solder is detected for all application positions in the first imaging area. Next, presence / absence detection is similarly performed for the second, third,... Imaging areas. As a result of this detection, when it is determined that the substrate (2) is defective, the conveyor (11) is stopped and the operator is notified by a notifying device (not shown). The substrate (2) determined to be normal is transported as it is.

Next, the substrate (2) is placed on the XY table (13) of the coating device (12) by the supply conveyor (14) which has inherited the normal substrate (2).

The X-axis motor (15) and the Y-axis motor (1)
The XY table (13) is moved XY by the rotation of (6), and the desired coating position of the substrate (2) is positioned below the coating nozzle (12).

Then, the cam (21) is rotated by the rotation of the drive motor (23), and the cam lever (20) swings downward about the fulcrum shaft (24) via the cam follower (22). The lowering of the cam lever (20) lowers the adhesive application unit (17) via the roller (19) and the roller receiver (18). Adhesive application unit (1
The lowering of 7) also lowers the application nozzle (25), and the tip of the nozzle (25) comes into contact with the substrate (2), and is discharged to the tip of the nozzle (25) by compressed air previously sent from the air tube (27). The desired adhesive is applied to a desired position.

When the cam (21) is further rotated by the drive motor (23), the cam lever (20) is swung upward, the adhesive applying unit (17) is raised, and the nozzle (25) is moved to the substrate ( Leave 2) and rise.

Thereafter, the coating operation is continued in the same manner, and the substrate (2) having completed the coating operation is discharged by the discharge conveyor (33).

Next, an image of the substrate (2) on the supply conveyor (37) inherited from the substrate (2) is taken from above by a CCD camera of the coating material presence / absence detecting device (60). That is,
The camera is moved XY to the first imaging area on the substrate (2) stored in the RAM. It is detected whether or not the adhesive is correctly applied in the imaging area (the position to be applied). At this time, if the position and the area of the applied adhesive with respect to the position data and the area data stored in the RAM satisfy the preset condition, it is determined to be normal. Hereinafter, the presence / absence of the adhesive is similarly detected for all application positions in the first imaging area. Next, the second, third ...
The presence / absence detection is similarly performed for the imaging area. As a result of this detection, when it is determined that the substrate (2) is defective, the conveyor (37) is stopped, and a worker is notified to that effect by a not-shown notification device. The board (2) determined to be normal is conveyed as it is, and the component mounting device (3)
5) placed on the XY table (36).

The X-axis motor (38) and the Y-axis motor (3
The XY table (36) is moved XY by the rotation of (9), and the desired component mounting position of the board (2) is set to the suction head section (4).
It is located below 1).

At this time, the suction head portion (41) from which the chip component has been taken out of the component supply device has been moved above the component mounting position by the rotation of the rotary plate (40).

Then, the suction head part (41) is lowered to mount chip components on the substrate (2).

Thereafter, the mounting operation is continued in the same manner, and the board (2) on which the mounting operation has been completed is discharged by the discharge conveyor (42).

Incidentally, the coating agent presence / absence detecting devices (50), (6)
The installation location of 0) is not limited to the present embodiment. For example, the application agent presence / absence detection device (50) is provided above the supply conveyor (14) of the application device (12), or the screen printing machine (1)
A new device (50) at an intermediate position between the
May be provided. Further, the application agent presence / absence detection device (60) is connected to the discharge conveyor (3) of the application device (12).
3) A space for the device (60) may be newly provided at an intermediate position between the application device (12) and the component mounting device (35). Further, the presence / absence detection may be performed not in the middle of the conveyance but in a state where it is positioned at a predetermined position.

Further, when it is detected that the coating agent is not applied, the conveyance may be continued as it is. In this case, a command is issued so that the downstream device does not work. That is,
When it is determined by the coating agent presence / absence detection device (50) that the screen printing by the screen printing machine (1) is incomplete,
The subsequent operations in the coating device (12) and the component mounting device (35) are not performed according to a command from the CPU, and the substrate (2)
Transport only. Similarly, when the application operation by the application device (12) is detected by the application agent presence / absence detection device (60) to be incomplete, the operation by the component mounting device (35) is not performed. If there is no communication function between the devices, a bat mark indicating a defective substrate is attached to the substrate (2) when the detection device (50) or (60) determines that the substrate is defective, and the substrate is recognized. If it is detected that the bat mark is attached to the substrate (2) conveyed by the camera, the operation may not be performed on the substrate (2).

[0063]

As described above, according to the present invention, the presence or absence of a coating agent on a printed circuit board can be detected, and a board that does not require subsequent work can be found at an early stage. The efficiency of the printing
Detects the presence of coating material on the board for each area of the printed circuit board
So, after screen printing on the printed circuit board,
Or, when the application of the coating agent to the printed circuit
After detecting the presence of the coating agent after the
For example, reducing the area of one image taken by a camera
With a small imaging area
Can be used, and the type of printed circuit board changes.
Even if the size of the printed circuit board changes
Increasing or decreasing the number of imaging areas with the cloth material detection device
Thus, it is possible to easily respond.

[Brief description of the drawings]

FIG. 1 is a diagram showing a component mounting line.

FIG. 2 is a side view showing the screen printing machine.

FIG. 3 is a perspective view of a coating apparatus.

FIG. 4 is a perspective view of the component mounting device.

[Explanation of symbols]

 (1) Screen printing machine (2) Printed circuit board (12) Coating device (35) Component mounting device (50) Coating agent presence / absence detection device (60) Coating agent presence / absence detection device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 13/04

Claims (2)

(57) [Claims] In a component assembling method for performing a predetermined operation for assembling a chip component on a printed board, a screen printer is used to screen a plurality of areas on the board.
Each area whether the printed coating agent in coating agent presence detection device
A component assembling method characterized in that detection is performed for each of the following . 2. A component assembling method for performing a predetermined operation for assembling a chip component on a printed circuit board, wherein the presence or absence of a coating material applied to a plurality of areas on the substrate by a coating device is detected. A component assembling method, wherein the apparatus detects each area .