JP2006324057A - Press fitting method of press fit terminal into printed-circuit board and press fitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain constant contacting press fitting height of press fit terminals into a terminal hole even if there are variations in the thickness of a printed-circuit board. <P>SOLUTION: This is a press fit method of a press fit terminal in which a plurality of press fit terminals arranged in a row holding the top end at the same height are pressed into terminal holes of a printed-circuit board or a bus bar and the elastic press fit part formed at the press fit terminals is made to contact the inner periphery face of the terminal holes and connected and fixed. One of the press fit terminal and the printed-circuit board or bus bar is made a fixed side and the other side is made a movable side and lifted or lowered to the fixed side, and the contacting position of the top end of the press fit terminal and the printed-circuit board or bus bar, or a position separated by a prescribed distance from the contacting position is made a reference position. A sensor is provided at the reference position and when it detects that the movable side reaches the reference position, the movable side is moved by a predetermined movement dimension from the detection position and made to stop, thereby, the press fit height of the press fit terminals into the terminal holes is maintained constant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a press-fit terminal press-fitting method and press-fitting device to a printed circuit board, and more specifically, an elastic press-fit portion provided in the press-fit terminal by press-fitting a press-fit terminal protruding from the press-fit connector into a terminal hole of the printed circuit board. In press-fitting equipment that presses and contacts the inner peripheral surface of the terminal hole for electrical connection, the press-fit terminal press-fitting height into the terminal hole of the printed circuit board is kept constant even if the board thickness varies. Thus, the press-fit accuracy is improved.

  Recently, a so-called press-fit connector (PFC) has been provided as a connector that can be electrically connected and fixed simply by press-fitting a terminal into a terminal hole of a printed circuit board and can be easily connected without requiring soldering. Various types of press-fit terminal press-fitting devices to the terminal holes of the printed circuit board have been proposed.

  For example, in Japanese Patent Application Laid-Open No. 2004-192976 (Patent Document 1), the present applicant attaches a printed circuit board 2 from above to a fixed press-fit connector 1 as shown in FIGS. 8A and 8B. 3 and press-fit terminals 4 protruding from the press-fit connector 1 are press-fitted into the terminal holes 2 a of the printed circuit board 2. At that time, the vicinity of the tip of the press-fit terminal 4 is passed through the hole of the alignment plate 5, and the press-fit terminal 4 is supported from below by the connector-side die 6.

In the press-fitting device, the front end positions L1 of a number of press-fit terminals 4 on the press-fit connector 1 side are made constant with accuracy by mounting flanges provided on the press-fit terminals 4, and variations in the front-end positions L1 of the terminals. Is extremely small and stable.
However, when a variation in the thickness D of the printed circuit board 2 and a slight amount of press distortion that occurs when the printed circuit board 2 is pressed by the press, the press-fit position of the press-fit terminal that is press-fitted into the terminal hole of the printed circuit board is not stable. There is.
Specifically, the tolerance of the thickness D of the printed circuit board 2 is set to be relatively large as ± 0.15 mm. If a variation due to press distortion is added to the variation in the plate thickness, a larger variation occurs.

Usually, the printed circuit board is driven by a servo motor and moved (lowered) to the press-fit connector side up to a preset numerical value, so that the press stroke is constant.
However, even when there is almost no press distortion, for example, as shown in FIG. 9A, when the thickness of the printed board 2 is a minus tolerance board, the press-fit terminal 4 to the terminal hole of the printed board is thin. This is a position where the press-fitting height is low (position where the press-fitting amount is small). Therefore, the gap S between the printed circuit board 2 and the connector 1 becomes too wide than the required dimension, and the elastic press-fit portion of the press-fit terminal is uneven at the position where it comes into contact with the inner peripheral surface of the terminal hole. Can not be secured.
On the contrary, as shown in FIG. 9C, when the thickness of the printed board 2 is a plus tolerance board, a proper gap S between the printed board 2 and the upper end surface of the housing of the connector 1 cannot be obtained. The printed circuit board 2 may come into contact with the upper end surface of the connector housing and interfere with each other to cause damage.
FIG. 9B shows a case where the thickness D of the printed board 2 is normal (± 0 mm), and shows an appropriate relationship in which the press-fit terminals 4 are press-fitted into the terminal holes of the printed board 2. 2 and the upper end surface of the connector 1 are provided with an appropriate gap S.

The press-fit terminal variation in the press-fit terminal to the printed circuit board terminal hole needs to be suppressed to ± 0.05mm. The variation of the printed board thickness of ± 0.15mm is the variation in the press-fit terminal press-fit position in the terminal hole. It will have a big impact on Therefore, it is necessary to control the press stroke of the printed circuit board in order to make the variation in the press-fit position of the press-fit terminal extremely small.
To solve this problem, the thickness of the printed circuit board is measured with a laser sensor and numerical processing is performed to eliminate printed circuit boards having variations exceeding the allowable tolerance, and the press stroke is changed according to the variation even within the allowable tolerance. In some cases.

In the connector press-fitting device disclosed in Japanese Patent Laid-Open No. 10-270898 (Patent Document 2), as shown in FIG. 10, a printed circuit board 2 ′ is placed on an XY moving table 5 and a press-fit terminal 4 ′ is attached. The fit connector 1 ′ is lowered to the printed circuit board 2 ′, and a press-fit terminal 4 ′ is press-fitted into the terminal hole.
In the connector press-fitting device of Patent Document 2, a pressure measurement unit that detects pressure input when press-fitting a press-fit terminal into a terminal hole of a printed circuit board, a plate thickness detection unit that detects the thickness of the printed circuit board, and press-fit A gap detection unit that detects the gap between the connector and the printed circuit board is provided, and a control unit that controls the pressure applied to the press-fit connector and the stop position based on the output values from the pressure measurement unit, plate thickness detector, and gap detection unit Provided.

JP 2004-192976 A Japanese Patent Laid-Open No. 10-270898

As described above, Patent Document 2 also describes that the variation in the thickness of the printed circuit board is detected by arranging a thickness detector and the press stroke is controlled according to the detected value.
However, when the press stroke is controlled by using a plate thickness detector as a countermeasure against variations in the thickness of the printed circuit board, if the detection is performed for each printed circuit board and the press stroke is controlled each time, the productivity becomes very poor. At the same time, there is a problem that the apparatus becomes very complicated and costly.
In addition, a non-contact laser sensor is usually used as the plate thickness detector. However, there is a possibility of erroneous measurement in the non-contact detection by the laser, and there is room for improvement in order to ensure electrical connection reliability. .

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and as a countermeasure against variations in the thickness of the printed circuit board, the printed circuit board can be easily and reliably replaced with a conventional non-contact laser sensor detection and press stroke control method. It is an object of the present invention to provide a method and a device capable of controlling the press-fitting height of a press-fit terminal into a terminal hole of the terminal.

In order to solve the above-mentioned problems, first, the present invention first press-fits a plurality of press-fit terminals arranged in alignment with holding the tips at the same height, into the terminal holes of a printed circuit board or bus bar, to the press-fit terminals. A press-fit terminal press-fitting method in which the formed elastic press-fitting part is brought into contact with the inner peripheral surface of the terminal hole to be connected and fixed,
The press-fit terminal and either one of the printed circuit board or the bus bar provided with the terminal hole are fixed side, and the other side is moved to the fixed side.
A contact position between the tip of the press-fit terminal and the printed circuit board or the bus bar or a position away from the contact position as a reference position is set as a reference position, and a sensor is provided at the reference position to detect that the movable side has reached the reference position. Providing a press-fit terminal press-fitting method in which the movable side is moved by a predetermined moving dimension from the detection position and then stopped, and the press-fit terminal press-fitting height into the terminal hole is kept constant. Yes.

  Specifically, the press-fit terminal is placed at a lower position, the tip position of the press-fit terminal or a position away from the tip position is set as the reference position, and the printed circuit board or the bus bar is pressed from above. When the lower surface of the printed circuit board or bus bar reaches the reference position, it is detected by the sensor, stopped by lowering by a predetermined dimension from the reference position, and press fit to the terminal hole. It is preferable to keep the press-fitting height of the terminals constant.

As described above, in the present invention, instead of the conventional method of measuring the thickness of the printed circuit board and controlling the press stroke, the tip of the press-fit terminal whose variation is smaller than the thickness crossing of the printed circuit board A method is adopted in which the position is set as a reference position, the printed circuit board is lowered from the reference position by a set dimension, and when the set position is reached, the downward movement of the printed circuit board is stopped.
According to this method, the tip position of the terminal with high accuracy is used as the reference position, the printed board is lowered from this reference position by the set dimension, and the terminal is press-fitted into the terminal hole. Even if there is variation within the allowable tolerance, the insertion amount (press-fit height) of the terminal from the lower surface of the printed circuit board can always be kept constant. In addition, if the setting position for stopping the descent of the printed circuit board is set to a position where a predetermined gap can be generated between the press-fit connector housing and the printed circuit board, printing can be performed even if the thickness of the printed circuit board is large. The problem that the substrate interferes with the housing does not occur.
As described above, according to the present invention, it is not necessary to measure the thickness of each printed circuit board one by one, and it is not necessary to control the press stroke according to the thickness, so that the press-fit terminal can be easily press-fitted into the printed circuit board. The height can be controlled.

Secondly, the present invention provides a press-fitting device used in the press-fitting method of the first invention.
That is, a fixing means for supporting the press-fit connector,
Holding means for holding the printed circuit board so that it can be lowered above the tips of the plurality of press-fit terminals protruding from the press-fit connector;
A substrate-side die disposed above the printed circuit board;
Drive to raise and lower the board-side die, lower the printed board toward the press-fit terminal side by contacting the upper surface of the printed board when lowered, and press-fit the press-fit terminal into each terminal hole provided on the printed board Means,
It is detected that the lower surface of the printed circuit board is lowered at the same position as the front end of the press-fit terminal or the reference position that is a predetermined distance away from the position, and the drive means when the printed circuit board is lowered from the reference position and reaches a set position. And a sensor for generating a signal for stopping driving, and a press-fit terminal press-fitting device to a printed circuit board.

  Specifically, the sensor includes a contact piece that is pivotally supported at the base end side and protrudes in a cantilevered manner, the free end of the contact piece is positioned at the reference position, and the printed circuit board is lowered. The free end is lowered together with the printed circuit board through the elastic material that elastically supports the contact piece, and the descending amount of the free end of the contact piece is detected as a voltage, and the detected voltage value becomes the set value. When it is reached that the set position is reached, a drive stop signal is issued to the servo motor constituting the drive means.

  Thus, the detection reliability is enhanced by using a contact type sensor that is in contact with the lower surface of the printed circuit board as compared with the case of using a non-contact sensor such as a laser sensor. As described above, the sensor contact piece is urged by an elastic material such as a spring, and is moved downward against the spring in conjunction with the lowering of the printed circuit board, and the voltage value is changed in accordance with the lowering. It is said. However, the sensor system is not limited to the sensor system, and can detect contact between the printed circuit board and the contact piece, and can detect that the printed circuit board has been lowered by a predetermined dimension from the detected reference position and has reached a set position. I just need it.

  It is preferable that a pair of left and right sensors be arranged at positions facing the left and right ends of the printed circuit board. When the printed circuit board is long, three or more sensors may be arranged at the left and right ends and the center position.

  In addition to press-fitting the press-fit terminal of the press-fit connector into the terminal hole of the printed circuit board, an apparatus similar to the above is suitable for press-fitting the press-fit terminal of the press-fit connector into the terminal hole drilled in the bus bar. Needless to say, it is used in

  Thirdly, according to the present invention, the press-fit terminal is press-fitted into the terminal hole of the printed circuit board by the press-fitting device, and the press-fit height of the press-fit terminal press-fitted into the terminal hole of the printed circuit board is constant. The press-fit terminal press-fitting structure to the board is provided.

  As described above, in the present invention, when the press-fit terminal of the press-fit connector is press-fitted into the terminal hole of the printed circuit board or the like, even if there is a variation in the thickness of the printed circuit board, the tip of the press-fit terminal is defined as a reference. Since the position is the reference position, and the contact type sensor detects that the bottom surface of the printed circuit board has reached the reference position, the descending dimension of the printed circuit board is controlled to be constant. The press-fitting height of the fit terminal can be kept constant, and the press-fitting accuracy can be kept high.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 7 show a first embodiment. First, the configuration of a press-fit connector having a press-fit terminal and a printed board will be described with reference to FIGS. 1 (A) and 1 (B).
1A and 1B show a press-fit terminal 11 (hereinafter abbreviated as a terminal 11) attached in advance to a press-fit connector 10 (hereinafter abbreviated as a connector 10) to a terminal hole 13 of a printed circuit board 12. The state before press-fitting is shown.
The connector 10 is provided with a connector-side jig 20 that supports the terminal 11 during press-fitting, and the printed board 12 is loaded with the pressing force of the board-side die 30.

The connector 10 is a multipolar connector, and a large number of terminals 11 which are L-shaped by protruding upward from one end face of a resin housing 10a and then bent upward are spaced apart from each other vertically and horizontally. Projecting in parallel. In the present embodiment, there are 21 left and right identical rows, and 63 terminals 11 are projected in three upper and lower stages.
An elastic press-fit portion 11a bulged in the shape of a needle press-fitted into the terminal hole 13 of the printed circuit board 12 is formed in the vicinity of the tip portion of each terminal 11 facing upward. It abuts on the pressing surface 20a of the connector side jig 20. The pressing surface 20a is formed on a bottom surface of a shallow bottom 20d formed in a direction orthogonal to a deep groove 20c provided at a distance in the left-right direction, and each terminal 11 is positioned and held at a predetermined position, and the tips of these terminals 11 are also positioned. 11t is held at a constant height without variation.

A terminal hole 13 is formed in the printed board 12 so as to penetrate in the thickness direction at a position facing the terminal 11, and the inner peripheral surface of these terminal holes 13 is on the upper surface side (or / and the lower surface) of the printed board 12. A conductive material that is electrically connected to the circuit formed on the side). Therefore, the elastic press-fitting portion 11a of the terminal 11 is press-fitted into the terminal hole 13 so as to be brought into elastic contact with the conductive material so that electrical connection and fixation are achieved.
The board-side die 30 is in contact with the upper surface of the printed circuit board 12 when lowered, and presses the printed circuit board 12 toward the terminal 11, and the tip of each terminal 11 penetrating the terminal hole 13 of the printed circuit board 12 is inserted. A groove 30a is provided. Further, a hole may be used instead of the groove 30a.

  2 shows a press-fitting device 100 composed of a press mechanism for press-fitting the terminal 11 attached to the connector 10 into the terminal hole 13 of the printed circuit board 12, FIG. 2 (A) is a front view, FIG. 2 (B) is a plan view, 3 is a schematic configuration, and FIG. 4 is an enlarged view of a main part.

The press-fitting device 100 includes a slide table 102 that is slidable in the XY direction on a base 101, and a floating table 103 that can be further slid in the Z direction on the slide table 102 (the dashed line in FIG. 2B). Is provided).
On the slide table 102, a connector setting jig 104 for setting the connector 10 and a connector side jig 20 are provided.
On the other hand, board positioning pins 106 are provided on the left and right sides of the floating table 103, respectively, and the end portions of the printed circuit board 12 are held through the board positioning pins 106 so as to be lowered.
Further, a bridging portion 108 is provided at the upper end of the support column 107 erected at the four corners of the base 101, a servo motor 110 is mounted on the bridging portion 108, and the downward output shaft 110a of the servo motor 110 is connected to the bridging portion 108. Yes.

  As the configuration, in the state where the printed board 12 with which the board-side die 30 is abutted from the upper surface and the terminals 11 supported from below by the connector-side jig 20 of the connector 10 face each other, the board-side die 30. Is lowered by the servo motor 110, and the printed board 12 is lowered downward by the board-side die 30 so that the terminal 11 is press-fitted into the terminal hole 13 of the printed board 12.

A pair of contact-type sensors 50 are attached to the slide table 102 and installed at positions below the left and right ends of a printed board supported on the floating table 13 via substrate positioning pins 106.
These sensors 50 comprise an electronic pick sensor or a sensor with a similar mechanism. The base end side of the contact piece 51 is rotatably supported on the sensor main body 51 of the sensor 50, and the free end 51a of the contact piece 51 is positioned below the printed circuit board 12 in a cantilever manner with a spring (not shown). The free end 51a is urged upward.
After the printed circuit board 12 is lowered and comes into contact with the free end 51a of the contact piece 51 on the lower surface 12a, when the printed circuit board 12 is further lowered, the leading end of the free end 51a is also moved downward. Stroke) is detected by the sensor 50 as a voltage value. When the detected voltage value reaches a predetermined value (threshold value), the servo motor 110 is stopped to stop the lowering of the printed circuit board 12 and the press-fitting of the terminal 11 into the terminal hole 13 is stopped. Is raised.

  As shown in FIG. 4, the installation position of the free end 51a of the contact piece 51 of the sensor 50 coincides with the tip end line L1 of the terminal 11, and this position is set as a reference position L1 for detection start. Therefore, the lower surface 12a of the printed circuit board 12 comes into contact with the free end 51a of the sensor at a position where the lower surface 12a of the terminal 11 reaches the reference position line L1, and detection is started. The printed circuit board 12 descends from the detection start position, presses the terminal 11 into the terminal hole 13, and when the printed circuit board 12 descends a predetermined stroke and reaches the reference position L2, a threshold value preset by the sensor 50 is obtained. Thus, the lowering of the printed circuit board 12 is stopped.

That is, the detection principle of the present invention does not detect the variation in the thickness of the printed circuit board as in the prior art, but contacts the contact piece 51 of the sensor 50 to the lower surface 12a of the printed circuit board 12 reaching the tip position of the terminal 11. Then, when the downward stroke of the printed circuit board 12 from this position (reference position L1) is detected and the set stroke is reached, the downward movement is stopped.
Thus, since the setting is made such that the printed circuit board 12 is always lowered from the reference position L1 at the moment when the terminal 11 is press-fitted into the terminal hole 13 to the set position L2, the length of the terminal 11 press-fitted into the terminal hole 13 is set. The height (press-fit height) is always kept constant.

5A, 5B, and 5C show the press-fitting process by the press-fitting device of the present invention. FIG. 5A shows a state before press-fitting, FIG. 5B shows a state immediately before press-fitting, and FIG.
In the state before press-fitting shown in (A), the lower surface 12 a of the printed circuit board 12 is not in contact with the contact piece 51 of the sensor 50 disposed below the printed circuit board 12. The substrate-side die 30 is lowered onto the upper surface 12b of the printed circuit board 12 by the servo motor 110 to come into contact with the upper surface 12b of the printed circuit board 12, and the printed circuit board 12 held on the floating table 103 is lowered.
As shown in (B), when the lower surface 12a of the printed circuit board 12 reaches a position L1 where it contacts the front end 11t of the terminal 11, the printed circuit board lower surface 12a comes into contact with the front end 51a of the contact piece 51 of the sensor 50. This contact position is the reference position L1 for starting detection. When the printed circuit board 12 is further lowered from the reference position L1, the contact piece 51 is also moved downward, and the voltage of the sensor 50 is changed according to the lowered amount.
As shown in FIG. 6C, when the voltage reaches the set position L2 after being lowered by the set stroke from the reference position L1, the voltage of the sensor 50 reaches the set threshold value, and the servo motor 110 is stopped.

At the stop position, the printed circuit board 12 is always lowered by a predetermined stroke from the reference position L1 where the tip of the terminal 11 and the lower surface 12a of the printed circuit board 12 are in contact with each other, so that it is press-fitted from the lower end opening of the terminal hole 13 of the printed circuit board 12. The press-fitting height of the terminal 11 can always be constant. An elastic press-fitting portion 11 a is provided at a portion to be press-fitted into the terminal hole 13. Therefore, the elastic press-fitting portion 11a is located at a fixed position inside the terminal hole 13 having a predetermined dimension from the lower end opening position of the terminal hole 13, and the electric connection position between the elastic press-fitted portion 11a and the conductive material in the terminal hole 13 is always constant. The electrical connection position of each terminal 11 in the large number of terminal holes 13 of the printed circuit board 12 can be kept constant with high accuracy.
In this way, after the terminals 11 are press-fitted and fixed in the terminal holes 13 of the printed circuit board 12, the board-side die 30 is lifted and removed from the connector-side jig 20, and as shown in FIGS. The press-fitting operation of the terminal 11 of the connector 10 into the terminal hole 13 on the printed circuit board 12 of the ten terminals 11 is finished.

The press-fitting structure of the terminal of the press-fit connector of the present invention into the terminal hole of the printed circuit board is not limited to the first embodiment, and the sensor 50 is arranged on both the left and right sides when the terminal arrangement area is long with a large connector. You may provide in two places and one place of an intermediate position. Further, the accuracy can be improved by adding more as necessary.
Moreover, although the reference position is the tip position of the press-fit terminal, it may be defined at a position that is a predetermined dimension above the tip position.
Furthermore, the press-fit terminal attached to the press-fit connector is not limited to the one that protrudes in an L shape from the end face of the connector housing. For example, it can be applied to one that protrudes linearly from the end face of the connector housing. It is.

Furthermore, in the said embodiment, although the connector is fixed and the printed circuit board is lowered | hung to the connector side, it is good also as a structure which reverses top and bottom.
That is, the printed circuit board is fixed, the sensor is disposed on the side of the upper surface line of the printed circuit board, the connector with the press-fit terminal protruding downward is attached to the movable side, and the connector is disposed above the printed circuit board. The structure is lowered to the printed circuit board side. A position at which the tip of the terminal protruding from the lower surface of the connector reaches the upper surface of the printed circuit board is detected by a sensor and set as a reference position, and the connector is set to descend by a predetermined stroke from the reference position.
In this case as well, the press-fitting height of the terminals that are press-fitted into the terminal holes of the printed board can be regulated to be constant regardless of variations in the thickness of the printed board.

FIG. 7 shows the second embodiment, which is different in that the printed circuit board of the first embodiment is replaced with a bus bar 200. Also in this case, the tip 51a of the contact piece 51 of the sensor 50 is disposed on the line of the tip 11t of the terminal 11 attached in advance to the connector.
When the bus bar 200 is lowered by the driving means and detected by the sensor 50, the bus bar 200 is lowered by the stroke set from the detection position. With this configuration, it is possible to accurately define the press-fitting height of the terminal 11 into the terminal hole 201 provided in the bus bar 200.

  An electrical component in which the press-fit terminal of the press-fit connector according to the present invention is electrically connected and fixed without being soldered by press-fitting the terminal into the terminal hole of the printed circuit board or the bus bar is attached to the electrical connection box mounted on the automobile. It can be accommodated and used suitably as an internal circuit material.

The state before the press-fit of the terminal of the press fit connector which concerns on embodiment of this invention to the printed circuit board is shown, (A) is sectional drawing, (B) is a side view. The press-fitting device of an embodiment of the present invention is shown, (A) is a front view and (B) is a top view. It is the schematic of the press injection apparatus of FIG. It is an enlarged view which shows a sensor attachment position. (A) (B) (C) is drawing which shows the process of press-fitting a terminal into the terminal hole of a printed circuit board. The state which removed the board | substrate side and the connector side jig | tool is shown, (A) is a front view, (B) is a side view. It is the schematic which shows 2nd Embodiment of this invention. (A) (B) is drawing which shows a prior art example. (A)-(C) are explanatory drawings which show the press fit relationship between the board thickness variation and the terminal. It is drawing which shows another prior art example.

Explanation of symbols

10 Press-fit connector (connector)
11 Press-fit terminals (terminals)
11a Elastic press-fit part 11t Tip 12 Printed circuit board 13 Terminal hole 20 Connector side jig 30 Board side jig 50 Sensor 51 Contact piece 100 Press-fitting device
200 Busbar L1 Reference position L2 Setting position

Claims (6)

Press-fit a plurality of press-fit terminals, which are aligned and held at the same tip, into the terminal hole of the printed circuit board or bus bar, and contact the inner periphery of the terminal hole with the elastic press-fit part formed on the press-fit terminal. Press-fit terminal press-fitting method to fix the connection,
The press-fit terminal and either one of the printed circuit board or the bus bar provided with the terminal hole are fixed side, and the other side is moved to the fixed side.
A contact position between the tip of the press-fit terminal and the printed circuit board or the bus bar or a position away from the contact position as a reference position is set as a reference position, and a sensor is provided at the reference position to detect that the movable side has reached the reference position. A press-fit terminal press-fitting method in which the movable side is moved from the detection position by a predetermined moving dimension and then stopped, and the press-fit terminal press-fitting height into the terminal hole is kept constant.   The press-fit terminal is fixed at a lower position, the tip position of the press-fit terminal or a position away from the tip position is set as the reference position, and the printed circuit board or the bus bar is lowered to the press-fit terminal side from above. When the lower surface of the printed board or bus bar reaches the reference position, it is detected by the sensor, stopped by being lowered by a predetermined dimension from the reference position, and the press-fit terminal press-fitting height into the terminal hole The method of press-fitting a press-fit terminal according to claim 1, wherein Fixing means for supporting the press-fit connector;
Holding means for holding the printed circuit board so that it can be lowered above the tips of the plurality of press-fit terminals protruding from the press-fit connector;
A substrate-side die disposed above the printed circuit board;
Drive to raise and lower the board-side die, lower the printed board toward the press-fit terminal side by contacting the upper surface of the printed board when lowered, and press-fit the press-fit terminal into each terminal hole provided on the printed board Means,
It is detected that the lower surface of the printed circuit board is lowered at the same position as the front end of the press-fit terminal or the reference position that is a predetermined distance away from the position, and the drive means when the printed circuit board is lowered from the reference position and reaches a set position. A press-fit terminal press-fitting device to a printed circuit board, comprising: a sensor for generating a signal for stopping driving.   The free end of the contact piece of the sensor is positioned at the reference position, and after the printed circuit board is lowered and brought into contact, it is lowered together with the printed circuit board, and the lowered amount of the contact piece is detected as a voltage, and the detected voltage value 4. A press-fit terminal press-fitting device for a printed circuit board according to claim 3, wherein a drive stop signal is issued to a servo motor that constitutes the drive means when it is detected that the motor has reached a set value and has reached the set position. .   A pair of left and right sensors are arranged at positions facing the left and right ends of the printed circuit board, or when the printed circuit board is long, three or more sensors are arranged at the left and right ends and a central position. 3. A press-fit terminal press-fitting device to a printed circuit board according to claim 3 or claim 4.   With the apparatus according to any one of claims 3 to 5, the press-fit terminal is press-fitted into the terminal hole of the printed circuit board, and the press-fit height of the press-fit terminal press-fitted into the terminal hole of the printed circuit board is constant. Press-fit terminal press-fitting structure to printed circuit boards.

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