JPS6141160B2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a method of assembling a substrate guide mechanism.

[Background of the invention]

BACKGROUND ART Electronic devices such as computers have a structure in which a plurality of electronic component mounting boards, which are small printed circuit boards on which electronic components are mounted, are attached to a logic board, which is a large printed circuit board. For example, such a structure is well known from JP-A-54-73950 (JP-A-58-16226), JP-A-54-111656 (JP-A-58-16230), and the like. As the density of electronic components increases, high dimensional accuracy is required for assembly. First, before explaining the assembly method, the prerequisite structure will be explained.

FIG. 1 shows the well-known structure described above in which an electronic component mounting board is connected to a logic board 8.

The logic board 8 is attached to an electronic device rack 10 via a frame 9. Pins 11 are attached to the logic board 8 for electrical connection with the electronic component mounting board 12. A connector 14 is attached to the electronic component mounting board 12 and is connected to the pin 11 of the logic board 8. Electronic parts 1
The logic signal No. 3 is transmitted through wiring (not shown) on the electronic component mounting board 12 and connected to the pin 11 on the logic board 8 side via the connector 14. Since the pins 11 are planted on the logic board 8 at a fairly high density, dimensional accuracy is required for connecting the pins 11 and the connector 14 when inserting the electronic component mounting board 12.
For this reason, as shown in FIG. 8, the logic board 8 is provided with a guide receiver 15 having a guide receiving recess 25, and the connector 14 is provided with a guide protrusion 24, so that when the electronic component mounting board 12 is inserted, the connector 14 The guide protrusion 24 is inserted into the guide receiving recess 25 of the guide receiver 15 with precision (this is also disclosed in the above-mentioned Japanese Utility Model Application No. 54-73950). . A board guide 17 for holding the electronic component mounting board 12 and guiding the electronic component mounting board 12 until the connector protrusion 24 is inserted into the guide receiving recess 25 is attached to the frame 9 by board guide fixing screws 21. It is being

Furthermore, in order to easily insert and remove the electronic component mounting board 12, a board insertion/extraction lever 19 is rotatably attached to the end of the electronic component mounting board 12, while a lever lock receiver 18 is connected to the rack 10 and the board guide 17.
The board 12 is attached to and removed by rotating the lever 19. Further, the substrate slip-off prevention protrusion 20 locks the lever 19 so that the lever 19 does not rotate due to vibration or the like and the substrate 12 does not come off (see Japanese Utility Model Publication No. 111656/1983).

Conventionally, when assembling an electronic device having such a structure, screws are tightened by relying on the positions of the mounting holes provided in the frame 9, the board guide 17, and the lever lock receiver 18. As described above, since the board guide 17 is assembled depending on the mounting hole positional accuracy, the vertical positional accuracy of the board guide 17 and the positional accuracy of the lever lock receiver 18 cannot be easily achieved due to dimensional errors and play. Therefore, a large amount of time is spent on assembly. If the positional accuracy of this part cannot be achieved, even if the electronic component mounting board 12 is inserted, the convex part 24 will not be properly inserted into the concave part 25, and there will be a problem that the pin 11 will not be able to enter the connector 14. In addition, the lever lock receiver 18
Of the positional accuracy, the dimensions related to the board insertion/extraction lever 19, that is, the logic board 8 and lever lock receiver 18.
There was a drawback that the dimensions could not be determined easily, and insertion and removal using the lever 19 could not be performed properly.

[Purpose of the invention]

An object of the present invention is to solve the above-mentioned drawbacks and to provide an assembly method that achieves high precision and reduces assembly man-hours.

[Embodiments of the invention]

An embodiment of the present invention will be described below.

In the present invention, the reference board 1 is used to assemble the board guide 17 and the lever lock receiver 18. As shown in FIGS. 2 to 4, the reference board 1 is made in consideration of the dimensional error of the electronic component mounting board 12, and has a guide 22 and a lever positioning tool 6 attached thereto, and a logic board 8 that serves as a positioning reference.
The logic board contact portion 3 facing the board guide 17 and the board guide contact portion 2 contacting the board guide 17 are finished with high precision. The guide 22 is made up of a guide protrusion 4 and a guide receiving contact portion 5. The lever positioner 6 can move up and down. The reference board 1 does not have any electrical connection means, and the board guide 17 is temporarily attached to the frame 9 to which the logic board 8 is attached (the board guide fixing screws 21 are not tightened), and the reference board 1 is used as a reference. The guide 22 is engaged with the guide receiver 15 by inserting the board 1 until the logic board contact portion 3 contacts the logic board surface. As shown in FIG. 7, the thickness of the guide protrusion 4 of the guide 22 is made precisely so as to fit snugly with the groove width of the guide receiving recess 25 of the guide receiver 15, and the guide receiving contact portion 5 of the guide receiving recess 25 of the guide receiver 15 is made precisely. A tight fit with the guide contact portion 16 ensures that the reference board 1 is accurately positioned on the logic board 8. As is clear from FIG. 8, the guide protrusion 24 of the connector 14 of the electronic component mounting board 8 has a relatively large margin with respect to the guide receiver 15, and from the comparison with FIG. I can understand the position. As described above, the guide 22 and the guide receiver 15 allow the reference board 1 to be accurately positioned in the vertical and depth directions in FIG. It is accurately positioned in the left-right direction in FIG.

In this state, the board guide 17 is brought into contact with the board guide contact portion 2 of the reference board 1 and fixed to the frame 9 by tightening the screws 21. As a result, the board guide 17 is fixed in alignment with the reference board 1 that is accurately positioned on the logic board 8 without play, so that the board guide 17 is accurately positioned with respect to the logic board 8.

Next, the lever lock receiver 18 is brought into contact with the lever receiving contact portion 7 of the lever positioning tool 6 attached to the reference board 1, and the lever lock receiver 18 is fixed to the board guide 17 with the fixing screw 23. The lever positioning tool 6 is attached to the reference board 1 so as to be slidable in a straight line. The lever 19 of the mounting board 12 is rotatable so that the mounting board 12 can be inserted and removed, whereas the lever positioning tool 6 of the reference board 1 is slidable linearly. If it were made rotatable, it would be difficult to set the rotation angle, so we created a structure that allows it to slide in a straight line to suit positioning.

As a result, the assembly is performed according to the reference board 1 accurately positioned on the logic board 8, the reference board has a shape suitable for assembly, and the assembly procedure is in an orderly manner. Shortening work time, simplifying adjustment work,
Dimensional accuracy is improved. If the guide mechanism is assembled in this manner, the dimensional accuracy is good, so that the actual electronic component mounting board 12 can be inserted and removed with high precision.

〔Effect of the invention〕

According to the present invention, assembly work time can be shortened, adjustment work can be simplified, and dimensional accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a side view of a device in which the present invention is used, FIG. 2 is a diagram showing an example of a reference substrate used in the present invention, FIG. 3 is a left side view of FIG. 2, and FIG. 5 is a diagram showing one embodiment of the present invention, FIG. 6 is a diagram showing cross section A-A in FIG. 5, and FIG.
The figure shows the cross section B-B in Figure 5, and Figure 8 shows the cross section BB in Figure 5.
It is a diagram showing a cross section CC in the figure. 1... Reference board, 8... Logic board, 9... Frame,
10... Shelf, 12... Electronic component mounting board, 17...
... Board guide, 18... Lever lock receiver.

Claims (1)

[Scope of Claims] 1. A logic board (for example, 8) to which a guide receiver (for example, 15) is attached, and a member (for example, 14) guided by the guide receiver and a board insertion/extraction lever (for example, for example) rotatably attached. 19) A method for assembling a board guide mechanism that serves as a guide for inserting and removing an electronic component mounting board (for example, 12) having an electronic component mounting board (for example, 12) and making an electrical connection using an electrical connection means possessed by both, the method comprising: engaging with the guide receiver; guide (e.g. 22)
A reference board (for example, 1) having a lever positioning tool (for example, 6) mounted so as to be slidable in a straight line is prepared, and the reference board is inserted until it abuts against the surface of the logic board, and the guide is inserted into the guide. After being engaged with the receiver, the frame (for example, 9) on which the logic board is attached by bringing the board guide (for example, 17) into contact with the reference board
A method for assembling a board guide mechanism, comprising the steps of: further fixing the lever lock receiver (for example, 18) to the board guide by bringing a lever lock receiver (for example, 18) into contact with the lever positioning tool.