JP3146746B2 - How to insert a press-fit connector into a printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting method for a press-fitting device for press-fitting a press-fit connector into a printed circuit board. A press-fit connector (hereinafter simply referred to as a connector) is a solderless press-fit type printed circuit board connector.

[0002]

2. Description of the Related Art Next, the construction of a conventional connector press-fitting device will be described with reference to FIG. 4 is a connector, 2 is a stocker, 3 is a transport mechanism, 4 is an insertion section, 5 is a moving mechanism, 6
Is a press-fit head, and 7 is a press-fit portion. Reference numeral 8 denotes a printed circuit board, 8A denotes a die, and 10 denotes a table.

In FIG. 4, a plurality of connectors 1 are accommodated in a stocker 2. Chuck 3A is floating mechanism 3
B and connected to the cylinder 3C. Transport mechanism 3
Moves the chuck 3A horizontally between the stocker 2 and the insertion section 4. The cylinder 3C moves the chuck 3A up and down.

[0004] The connector 1 removed from the stocker 2 by the chuck 3A is inserted into the insertion portion 4, and the pins 1A of the connector 1 are aligned. The insertion section 4 is elastically held by the mounting plate 5A, and the moving mechanism 5 reciprocates the insertion section 4 below the press-fit head 6 with the slide rail 5B connecting the mounting plate 5A and the substrate 5C as a guide.

The press-fit head 6 attaches and detaches the connector 1, and is elastically connected to the cylinder 7A of the press-fit portion 7 via a block 18. The press-fitting portion 7 moves the press-fitting head 6 up and down with the guide shaft 7B held on the base 7D as a guide. The guide 7C is attached to the L-shaped substrate shown in FIG. 4, and guides the guide shaft 7B.

The die 8A of FIG. 4 has the same arrangement as the through-holes of the printed circuit board 8, and has holes for the pins 1A. The die 8A is fixed to the table 10 on the bed 10A, and the table 10 moves in the XY directions according to a command from an NC device (not shown).

Next, the operation of FIG. 4 will be described. FIG. 4 shows a state in which the press-fit head 6 is sucking the connector 1 and a state before the press-fit. Next, the table 10 moves to a predetermined XY coordinate according to a command from the NC device, and the cylinder 7A lowers the press-fit head 6. The press-fit head 6 inserts the pin 1A into the printed circuit board 8.

A detector 17 such as a proximity switch is incorporated in the die 8A shown in FIG. 4, and detects a pin 1A of the connector 1 passing through a through hole of the printed circuit board 8. When the detector 17 detects the pin 1A in FIG. 4, the press-fitting head 6 is further lowered to press-fit the connector 1 into the printed circuit board 8. When the press-fitting is completed, the press-fitting head 6 moves up and holds the next connector 1 from the insertion portion 4.

In FIG. 4, when the detector 17 does not detect the pin 1A, the press-fit head 6 holds the connector 1 and rises. Next, the transport mechanism 15 connects the chute 15A to the connector 1.
Move it down. Next, the transport mechanism 15
A is moved to the press-fit head 6 side. The press-fit head 6 attaches and detaches the connector 1, and the connector 1 is guided by the chute 15A and is removed by the defective case 2A.

FIG. 4 shows a configuration in which a transport mechanism 15, a defective case 2A and a detector 17 are added to FIG. 1 of Japanese Patent Application No. 5-32611.

[0011]

In FIG. 4, it is possible to reduce poor press-fitting of the connector and damage to the printed circuit board 8. However, when the number of connectors 1 determined to be defective increases, there is a problem that the yield of the connectors 1 to be inserted into the printed circuit board 8 deteriorates.

Most of the causes of the press-fitting failure are caused by the connector 1
Is a position shift at the tip end portion 14 of the pin 1A due to the inclination of the pin 1A. The state of the inclination of the pin 1A of the connector 1 will be described with reference to FIG. FIG. 5A shows a normal connector.
FIG. 5A shows a case where a pin 1A is attached to a housing 1B with an inclination.

FIG. 5C shows a state in which the pin 1 is attached to the housing 1B.
A is a right angle but housing 1B of pin 1A
The dimensions to enter are different. In FIG. 5, pin 1A
Of the press-fitting head 6 enters the hole 6A and is held by suction. The press-fit portion 11 of the pin 1A enters the through hole of the printed circuit board 8 and press-fit is completed. In FIG. 5, the mounting portion 12 of the pin 1A of the connector 1 is provided on the press-fitting surface 6B of the press-fitting head 6.
Contact, and the posture is determined. 5A and 5C are considered to occur when the housing 1B and the pin 1A of the connector 1 are assembled, and the pins 1A all tend to tilt in the same direction by the same dimension. .

FIGS. 5A and 5C show the inclination of the pin 1A with particular emphasis. However, according to the actually measured values, even if the tip portion 14 of the pin 1A is as long as about 20 mm, the positional deviation at the tip is not significant. Is
It is about 0.2 to 0.5 mm.

An object of the present invention is to provide a control method for improving the yield of inserting the connector 1 into the printed circuit board 8 by utilizing the inclination tendency of the pin 1A.

[0016]

In order to achieve this object, in the first invention, the control unit 9 includes an input unit 9A, a press-fit coordinate memory 9B, an input unit 9C, and a setting memory 9D.
A main control unit 9E, a correction coordinate memory 9F, a counter memory 9G, and a mechanism operation control unit 9H. The input unit 9A sends press-fit coordinate data 91 of the printed circuit board 8 to the main control unit 9E. The main control unit 9E stores the press-fit coordinate data 91
Is written into the press-fit coordinate memory 9B, the main control unit 9E reads the press-fit coordinate data 91 into the press-fit coordinate memory 9B, instructs the mechanism operation control unit 9H to move the table 10 to the press-fit coordinate An0, and lowers the press-fit head 6. When the detecting means 17 does not detect the pin 1A, the main control section 9E reads the corrected coordinates Ani from the corrected coordinates memory 9F and reads the table 10A.
Is moved to the correction coordinates Ani, the press-fit head 6 is lowered, and the press-fit head 6 is inserted into the connector 1 at the correction coordinates Ani.
When the number of corrections "L1" of D is reached, the main control unit 9E instructs the mechanism operation control unit 9H to remove the connector 1, the press-fit head 6 descends, and inserts the connector 1 at the position of the correction coordinates Ani. Is detected, the mechanism operation control unit 9H is instructed to move the table 10 to the press-fitting coordinates An0, the connector 1 is press-fitted into the printed circuit board 8, and the correction coordinate memory 9F is rewritten with the correction coordinates Ani.

In the second invention, the number of defects "m" of the connector 1 at the correction coordinates Ani is written to the counter memory 9G, and the number of insertion defects "m" is compared with the same number of defects "L2" of the setting memory 9D. When m = L2, the main control unit 9E issues an alarm.

[OO18] In the third invention, centering on the press-fitting position Ano,
Distance Δl smaller than through hole diameter r of printed circuit board 8
The position moved only in the X and Y directions is defined as the correction coordinate Ani.

According to the fourth aspect of the invention, the connector 1 keeps the same correction coordinate Ani continuously for the number of continuous corrections "K" in the setting memory 9D.
In the case of inserting at the position, the press-fit coordinate An0 is changed to the correction coordinate Ani.
And the correction coordinate memory 9F is rewritten.

[0020]

Next, the structure of the press-fitting device according to the present invention will be described with reference to FIG. Reference numeral 9 in FIG. 1 denotes a control unit, which is an input unit 9A.
, A press-fit coordinate memory 9B, an input means 9C, a setting memory 9D, a main control unit 9E, a correction coordinate memory 9F, a counter memory 9G, and a mechanism operation control unit 9H. The control unit 9 and the alarm unit 16 are connected to the control unit 9.
Reference numerals 10X and 10Y denote motors for moving the table 10 in the XY directions, and the other configurations are the same as those in FIG.

In FIG. 1, the input means 9A sends the press-fit coordinate data 91 on the XY plane of the table 10 to the main control section 9E. The main control unit 9E instructs writing / reading of memory between components in the control unit 9 or input / output between components by a program in the control unit 9.

The main controller 9E writes the press-fit coordinate data 91 into the press-fit coordinate memory 9B. The main control unit 9E reads the press-fit coordinate data 91 from the press-fit coordinate memory 9B,
E instructs the mechanism operation control unit 9H to move the table 10 to the press-fitting coordinates An0.

The mechanism operation control unit 9H is connected to a cylinder 7A for moving the press-fitting head 6 up and down, a switching valve (not shown) for the press-fitting head 6 to attach and detach the connector 1, and motors 10X and 10Y. Control by command of main controller 9E

The input means 9C is, for example, a keyboard, and the input means 9C inputs initial setting conditions to the setting memory 9D. Initial setting conditions are written in the setting memory 9D.

The correction coordinates Ani are written in the correction coordinate memory 9F in the procedure of FIG. The correction coordinates Ani are read by the main control unit 9E, and the main control unit 9E instructs the mechanism operation control unit 9H to move the table 10 to the correction coordinates Ani.

The counter memory 9G stores the number of insertions of the connector 1 at the correction coordinates Ani, and the number of insertions is read by the main controller 9E as necessary.

Next, the relationship between the press-fit coordinates An0 and the correction coordinates Ani will be described with reference to FIG. The coordinates An0 (Xn, Yn) in FIG.
) Indicates the center position of the through hole of the printed circuit board 8 into which the connector 1 is press-fitted. “N” means the position of the n-th through hole into which the connector 1 is press-fitted.
n, Yn) as the center.

The press-fit coordinates Ano (Xn, Yn) are stored in the control unit 9.
Is the press-fit coordinate data 91 that has been input to. The corrected coordinates Ani are positions shifted by ± △ l in the X and Y directions about the press-fit coordinates Ano. According to the present invention, the order of the correction coordinates Ani is determined as An1, An2, An3, and An4 as shown in FIG.

In FIG. 2, the number of movements of the correction coordinates of the connector 1 is set to "4". In FIG. 2, Δl is considerably smaller than the radius r, so that the through holes having the radius r are An1 and An.
The figure formed by moving four times with 2, An3, and An4 is approximate to a circle having a radius (r + △ l). Therefore, when all the pins 1A of the connector 1 are inclined in the same direction as shown in FIG. 5, if the connector 1 is inserted into the correction coordinates Ani shown in FIG. 2, the through hole having the radius (r + △ l) is obtained. Since it is inserted into the hole, the probability of insertion increases.

When it is confirmed that the pin 1A of the connector 1 has been inserted into the correction coordinates Ani, the table 10 is moved to the press-fitting coordinates Ano while the pins 1A are inserted into the printed circuit board 8, and the connector 1 is press-fitted. I do.

In the connector 1 as shown in FIGS. 5A and 5B, the same tendency appears for each manufacturing rod. In the present invention, when the correction position Ani of the table 10 is continuously inserted at the same position K times, for example, when the correction position Ani is continuously inserted K times at the position of An3 in FIG. The connector 1 is inserted at the corrected coordinate ni. If you do this,
The insertion probability increases.

Next, the operation of FIG. 1 will be described with reference to the flowchart of FIG. The control unit 9 has input means 9 in advance.
At A, the press-fit coordinate data 91 is input to the press-fit coordinate memory 9B. The total number of press-fits S of the connector 1 and the number of corrections L1 of insertion of the same connector are input to the setting memory 9D by the input means 9C.
The number L2 of defective insertions of the same connector and the number K of consecutive corrections of the same correction coordinates are input.

In step 101 of FIG. 3, the press-fit head 6 sucks the connector 1, and in step 102, the main control unit 9E
Reads the press-fit coordinates from the press-fit coordinate memory 9B. In step 103, the main control unit 9E instructs the mechanism operation control unit 9H to move the table 10 to the press-fit coordinates An0. In step 104, the press-fit head 6 connects the pin 1A to the printed circuit board. 8
Insert

In step 105, the detecting means 17 determines that the pin 1A
Is detected, the process proceeds to step 106. Step 1
At 06, the press-fit head 6 press-fits the connector 1 into the printed circuit board 8, and proceeds to step 107.

When the connector press-fitting position number n to the printed circuit board 8 reaches the total press-fitted number S of the connector 1 in step 107, the operation is terminated, and the next connector 1
Press-fit. When n ≠ S in step 107, the process returns to the previous stage of step 101, and the next connector 1 is press-fitted.

At step 105, the detecting means 17 detects the pin 1A.
If is not detected, the process proceeds to step 108. In step 108, the main control unit 9E reads the corrected coordinates Ani from the corrected coordinate memory 9F, and proceeds to step 109.

In step 109, it is determined whether or not the correction coordinates Ani have reached the number of corrections L1 of the same connector. When i ≠ L1 in step 109, the process proceeds to step 110,
When i = L1, the process proceeds to step 120.

In step 110, the press-fit head 6 is lifted while holding the connector 1, and in step 111, the main controller 9E instructs the mechanism operation controller 9H to move the table 10 to the correction coordinates Ani. In step 112, the press-fit head 6 descends to insert the pins 1A of the connector 1 into the printed circuit board 8, and proceeds to step 113.

In step 113, the detecting means 17 detects the pin 1A. If the pin 1A is not detected, the process returns to the step before the step 108 and the connector 1 is inserted into the next correction coordinate Ani. In step 113, the detecting means 17 sets the pin 1A
Is detected, the process proceeds to step 114.

In step 114, it is determined whether or not the corrected coordinate Ani matches the previous corrected coordinate P. If Ani = P, the process proceeds to step 115. In step 115, +1 is added to the number of consecutive insertions T of the same correction coordinates Ani, and step 11 is executed.
Proceed to 6.

In step 116, it is determined whether or not the number of consecutive insertions T of the same correction coordinate Ani matches the number of consecutive corrections K of the same correction coordinate Ani set in the setting memory 9D. If T = K in step 116, the process proceeds to step 117. In step 117, the correction coordinates A stored in the correction coordinate memory are stored.
The ni is rewritten, the order of correction from press-fit coordinates to correction coordinates is changed, and the routine proceeds to step 118.

In step 118, the table 10 is moved to the press-fitting coordinates An0, and the process returns to the previous stage of step 106.

If Ani ≠ P in step 114, the flow advances to step 119. In step 119, the correction coordinates Ani in the correction coordinate memory 9F are rewritten, and the number of continuous insertions T of the same correction coordinates Ani is counted. move on.
If T ≠ K in step 116, the process skips step 117 and proceeds to step 118.

In step 109, when the correction coordinates Ani have reached the number of corrections L1 of the same connector (i = L1)
Goes to step 120. In step 120, the press-fit head 6 is lifted while holding the connector 1. In step 121, the connector 1 is removed from the defective case 2 </ b> A, and the process proceeds to step 122.

In step 122, the counter memory 9G
M of the connector 1 and the setting memory 9
The number L2 of insertion failures set in D is compared. Step 1
22, when m = L2, the main control unit 9E outputs the alarm unit 16
Command an alarm. The alarm is made to be noticed to the worker by voice or light.

If m ≠ L2 in step 122, +1 is added to the counter memory 9G, the process returns to the previous stage of step 101, and the next connector 1 is press-fitted.

[0047]

According to the present invention, when the connector cannot be inserted into the press-fit coordinates of the printed circuit board, the connector is inserted into the correction coordinates, so that the press-fit failure can be reduced. Further, the correction coordinates are set in four orthogonal directions where the pins of the connector tend to be inclined, and the connector is inserted into the correction coordinates that are continuously inserted, so that the probability of insertion increases and the work efficiency increases.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a press-fitting device according to the present invention.

FIG. 2 is a diagram illustrating the relationship between a press-fit coordinate An0 and a correction coordinate Ani according to the present invention.

FIG. 3 is a flowchart illustrating the operation of FIG. 1;

FIG. 4 is a configuration diagram of a conventional connector press-fitting device.

FIG. 5 is a state diagram of the inclination of the pin 1A of the connector 1.

[Explanation of symbols]

 Reference Signs List 1 press-fit connector 1A pin 6 press-fit head 8 printed board 8A die 9 control unit 9A input means 9B press-fit coordinate memory 9C input means 9D setting memory 9E main control unit 9F correction coordinate memory 9G counter memory 9H mechanism operation control unit 10 table 17 detection Container 91 Press-fit coordinate data

Claims (4)

(57) [Claims] A die (8A) has a printed circuit board (8) mounted thereon,
The table (10) is equipped with a die (8A), the control unit (9) instructs the table (10) to move in the XY directions,
(6) moves up and down while holding the press-fit connector (1), and when the detector (17) built in the die (8A) detects the tip of the pin (1A) of the press-fit connector (1) In the press-fitting device for press-fitting the press-fit connector (1) into the printed circuit board (8), the control unit (9) includes a first input means (9A) and a press-fit coordinate memory (9).
B), second input means (9C), setting memory (9D), main controller (9E), corrected coordinate memory (9F), and counter memory (9F).
G) and a mechanism operation control unit (9H). The first input means (9A) sends press-fit coordinate data (91) of the printed circuit board (8) to the main control unit (9E), The part (9E) stores the press-fit coordinate data (91) in the press-fit coordinate memory (9
B), the main controller (9E) stores the press-fit coordinate data (91) in the press-fit coordinate memory (9
B) and instructs the mechanism operation control section (9H) to move the table (10) to the press-fitting coordinates An0, the press-fitting head (6) descends, and the detecting means (17) does not detect the pin (1A). At this time, the main control section (9E) reads the corrected coordinates Ani from the corrected coordinate memory (9F) and stores the corrected coordinates Ani in the table (10).
The mechanism operation control unit (9H) is instructed to move to the ni, the press-fit head (6) is lowered, and inserted into the press-fit connector (1) at the corrected coordinate Ani. When the number of corrections “L1” of 9D) has been reached, the main control unit (9E) commands the mechanism operation control unit (9H) to remove the press-fit connector (1), and the press-fit head (6) descends. When the insertion of the press-fit connector (1) is detected at the position of the correction coordinates Ani, the mechanism operation control unit moves the table (10) to the press-fit coordinates An0.
(9H) and press-fitting the re-fit connector (1) into the printed circuit board (8) and rewriting the corrected coordinate memory (9F) with the corrected coordinates Ani. . 2. The number of defects "m" of the press-fit connector (1) at the correction coordinates Ani is written into the counter memory (9G), and the number of insertion defects "m" is the same as the number of defects "L2" in the setting memory (9D). And when m = L2, the main control section (9E) issues an alarm. The method of inserting a press-fit connector into a printed circuit board according to claim 1, wherein 3. A printed circuit board (8) centering on the press-fitting position Ano.
2. The method for inserting a press-fit connector into a printed circuit board according to claim 1, wherein a position moved in the X and Y directions by a distance .DELTA.l smaller than the through hole diameter r is used as the correction coordinate Ani. 4. The press-fit connector (1) continues the same correction coordinate A for the number of continuous corrections "K" in the setting memory (9D).
ni, the insertion coordinates An0 to the correction coordinates Ani
2. The method of inserting a press-fit connector into a printed circuit board according to claim 1, wherein the correction order is changed and the correction coordinate memory (9F) is rewritten.