JPS5838259B2 - Eyelet Mekashime Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a grommet crimping device that can swage a grommet inserted into a double-sided printed circuit board, and an object thereof is to provide a device that can swage a grommet by correctly aligning a punch with the center of the grommet. It is something to do.

Conventionally, through-hole plating used for double-sided printed circuit boards would crack at the soldered areas if warpage or stress was applied to the printed circuit board due to temperature changes such as during soldering after inserting electrical circuit components.

To prevent this drawback, instead of through-hole plating, there is a structure in which a stopper is inserted into the board and soldered to the copper foil portions on both sides.

At this time, in order to improve solderability, the eyelet is divided into multiple parts and caulked.

There are various methods for dividing, but explanation will be given by taking six divisions as an example.

As shown in FIG.
A divided punch 1 is provided, and on the other hand, a through hole 4 is formed in the printed circuit board 3, a cylindrical eyelet 5 is inserted into the through hole 4, and a caulking stand 6 is positioned below. 5 is caulked with the above-mentioned punch 1 from above.

However, if the center of the through hole 4 and the center of the punch 1 do not perfectly match, the crimping will be uneven as shown in FIG. 1C, and the eyelet will not be divided into six parts correctly as shown in FIG. 1D. A. As shown by B and C, the pattern becomes non-uniform, and it is difficult to make a complete electrical connection with the copper foil portion of the printed circuit board 3.

In addition, as shown in Fig. 2 as be C@d, when a conical part I is formed at the lower end of the punch 1, the tip of the eyelet 5 widens due to this conical part 7, and cracks D, E, F are formed slightly.
It is also not a good idea for electrical connections because it is closed after entering.

To prevent further cracks from forming, see Figure 3 aeb.
As shown in FIG. 3, the tip of the punch 1 has a conical portion 8 with a smaller diameter than that in FIG. 2, or a hexagonal conical portion 9 as shown in FIG. 3C.
However, in this case, the center of the through hole 4 and the center of the punch 1 do not coincide with each other, as shown in FIG. 3d, and a good caulking condition cannot be obtained.

The present invention aims to improve the above-mentioned drawbacks, and one embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, a flat part 11 is formed at the center of the lower surface of the cylindrical pon 10, and a tapered part 12 is formed around the lower end of the cylindrical pon 10, which is divided into six parts by a plane.
In addition, a regulating hole 13 is provided in the center from the flat portion 11 toward the axially inward side of the punch 10.

On the other hand, 14 is a caulking stand, which includes a cylindrical part 15 in contact with the inner peripheral surface of the eyelet, a cylindrical part 16 provided coaxially on this cylindrical part 15 and in contact with the inner diameter of the regulation hole 13,
A conical portion 17 is integrally formed at the upper end, and a flat portion 18 having a larger diameter than the cylindrical shape contacts the lower end of the eyelet.

FIG. 5 shows the state in which the closure is crimped.

A through hole 20 is provided in the printed circuit board 19, and a cylindrical eyelet 21 is inserted into the through hole 20.

This state is such that the cylindrical part 15.16 of the caulking stand 14 is positioned from below the eyelet 21 so as to fit inside the eyelet 21, and the flat part 18 is brought into contact with the lower end of the eyelet 21. Lower the punch 10 from above the stop 21,
The conical part 17 and the columnar part 16 are fitted into the regulating hole 13.

As the punch 10 continues to descend, the tapered portion 12 stops 2.
1, cut it into six equal parts, and caulk the clasp 21 to the printed circuit board 19 as shown in FIG.

If copper foil parts are attached to both the front and back sides of this printed circuit board 190, both copper foil parts are electrically connected by the dovetail eyelet 21.

FIG. 7 shows a plurality of eyelets 21 on one printed circuit board 19.
This shows a device that caulks both at the same time.

Attach the caulking stand 14 downward to the lower surface of the movable plate 22,
The movable plate 22 has a guide rod 23a. 23b, it moves up and down smoothly.

On the other hand, a bolt 10 is attached to the upper surface of the fixing plate 24 facing upward and facing the caulking table 14, and the printer 1/substrate 19 is attached at both ends to the support plate 25a. 25b, and position regulating portions 26a. The position is controlled by 26b, and the support pillar 27a27
b and spring 28a. 28b moves the printed circuit board 19 up and down.

The cylindrical portion 15 of the clasp 14 and the inner diameter of the eyelet 21 may have a slight clearance (approximately 0.02 mm).

When the eyelet 14 descends, the cylindrical part 15 first moves to the eyelet 2.
1 and further descends, the cylindrical part 16 and punch 1
Since the second regulating hole 13 is fitted to correctly determine the center, the end of the eyelet 21 can be accurately pushed out and caulked by the tapered portion 12.

Note that if one end of the eyelet 21 is expanded in advance, even if it is inserted into the through hole 20 of the printed circuit board 19, it will not fall.

Similarly, in the above embodiment, the case where the fasteners are caulked to a double-sided printed circuit board has been described, but the present invention can be used to caulk the fasteners to any desired board.

As described above, the present invention provides a regulating hole in the axial direction from the center of one end of a cylindrical punch, and also forms a tapered portion with a plurality of planes around one end of the punch, which is fitted into the regulating hole. a first cylindrical part that fits together, a second cylindrical part that is provided continuously to this cylindrical part and fits into an eyelet that is larger than the outer diameter of this cylindrical part, and a lower end of the eyelet. A caulking stand consisting of a flat part having a larger diameter than the second cylindrical part that comes into contact with the base plate is provided, and the first and second cylindrical parts of the caulking stand are inserted into the eyelets inserted into the through holes of the substrate. , a grommet crimping device characterized in that the first cylindrical part is inserted into the regulating hole of the punch, and force is applied to the punch to swage the eyelet; After fitting the center regulation hole of the punch, the eyelet is caulked and fixed to the through hole of the board, so the center of the punch and the center of the eyelet can be aligned correctly, so the eyelet is It can be accurately divided into equal parts, spread out, and caulked onto the substrate.

As a result, it is possible to obtain a highly reliable product with uniform quality and fewer defects without requiring much dimensional accuracy in the size of the through holes or the spacing between them, and it has practical value especially when used for double-sided printed circuit boards. It has a high value.

[Brief explanation of drawings]

Figure 1 a+ be Cm d is a side view of a conventional punch;
Bottom view, cross-sectional side view of double-sided printed circuit board, top view, Figure 2 as b, ce d are side views of other conventional punches,
Bottom view, cross-sectional side view of a double-sided printed circuit board, top view, Figure 3 as b, e, d are side views and bottom views of other conventional punches, bottom view, top view of a different punch, Figure 4 as be
c* d is a side view and bottom view of a punch used in a grommet crimping device according to an embodiment of the present invention, a plan view and a side view of a crimping stand, FIG. 5 is a cross-sectional side view of the same device, and FIG. 6 is a double-sided view. FIG. 7 is a plan view of the printed circuit board and a side view of the device. 10... Punch 12... Theba part,
13... Regulation hole, 14... Caulking stand, 15.16... Cylindrical part, 19... Curved double-sided printed circuit board, 2o゜kawa゜゜ through hole, 21 ..... Eyelet.

Claims (1)

[Claims] 1. A regulating hole is provided in the axial direction from the center of one end of a cylindrical punch, and a tapered portion is formed by a plurality of planes around one end of the punch, and a first circle that fits into the regulating hole is formed. a columnar part, a second columnar part that is provided continuously to the columnar part and fits into an eyelet larger than the outer diameter of the columnar part, and a second columnar part that comes into contact with the lower end of the eyelet. A caulking stand made of a flat part with a larger diameter than the cylindrical part is provided, and the first part of the caulking stand is inserted into the eyelet inserted into the through hole of the substrate.
A dovetail caulking device characterized in that a second cylindrical portion is inserted, and with the first cylindrical portion inserted into the regulating hole of the punch, force is applied to the punch to caulk the eyelet. .