JPS6248331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a display circuit block built into a switch, which lights up a display element such as a neon tube when the switch is off to indicate the location of the switch in the dark.

[Background technology]

FIG. 1 shows a sectional view of a so-called firefly type switch, in which a movable contact body 4 is swingably supported by a support protrusion 3 of a conductive metal fitting 2 arranged at the bottom of a device body 1, and the switch can be operated. Central rib 5 of handle 5
The lower half of the coil spring 7 whose upper half has been inserted into the hole 6 provided in the section a is fitted into the movable contact body 4, and the coil spring 7 is bent and reversed in response to the reversing operation of the operating handle 5, and the movable contact body 4 The movable contact 8 provided on the upper side surface of the movable contact body 4 is rotated left and right around the support protrusion 3, and as a result of this left and right rotation, the movable contact 8 provided on the upper side surface of the movable contact body 4 is rotated to the fixed terminal plate 9. It contacts and separates from a certain fixed contact 10 to turn on and off. In the figure, reference numeral 11 or 12 is a locking metal fitting for a quick connection terminal, and a connecting terminal 13 or 1 is connected to the fixed terminal plate 9 or the terminal plate part 2a of the conductive metal fitting 2.
4. In the figure, the double quick connection terminal 1 is in contact with the movable contact 8 and the fixed contact 10.
3 and 14 are energized and turned on as a switch.

By the way, this type of switch is equipped with a display element 15 such as a neon tube to display the position of the switch when the switch is turned off, and is illuminated through a lamp cover of the operating handle 5 made of a transparent material. However, in the display circuit block built into a conventional switch, a display element 15 and a current-limiting resistor 17 are connected in series to a printed circuit board 16 by soldering, as shown in FIGS. The block member is attached to the operating handle 5 by inserting the central rib 5a of the operating handle 5 into the hole 18 provided in the printed circuit board 16. Then, one end of one lead wire 20 of the resistor 17 is electrically connected to the upper end of the coil spring 7, and the display element 1
A contact portion 19 connected to one end of the printed circuit board 16 is provided on the lower surface of the end of the printed circuit board 16, and when the operation handle 5 is turned to the off side, the contact portion 19 contacts the upper surface of the fixed terminal plate 9, and the quick connection terminal 14, An energizing circuit is formed of the conductive metal fitting 2, the movable contact body 4, the coil spring 7, the resistor 17, the display element 15, the fixed terminal plate 9, and the quick connection terminal 13, so that the display element 15 emits light.

This type of switch is very convenient for the user because it can display the location of the switch in the dark by incorporating a display circuit block, but the conventional display circuit block is not connected to the printed circuit board 1 as described above.
The resistor 17 and the display element 15 are connected in series on the printed circuit board 16 by soldering, and each component is made to stand upright on the printed circuit board 16, resulting in instability and difficulty in turning the operating handle 5 on and off. There was a problem in that vibrations were transmitted and the wires were broken, and assembly was very troublesome.

Further, as a display circuit block using a molded substrate, there is one described in Japanese Utility Model Application Publication No. 57224/1998.

In other words, in this conventional example, a molded rib base for supporting the display element is integrally provided on the surface of the molded substrate, and a locking means for locking and holding the resistor is provided protruding from the surface of the molded substrate. The connection between the resistor and the resistor is made by directly connecting the lead wires to each other by soldering, etc., and connects them in series. Therefore, the electric circuit is exposed and there is a risk of being affected by arcing when used in a switch. Furthermore, when soldering the lead wires to each other, it is necessary to bend the lead wires and place them in a position where they can be joined, resulting in poor assembly efficiency and a structure unsuitable for automatic assembly.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing a display circuit block, which allows display circuit blocks to be automatically assembled through a consistent assembly process.

[Disclosure of the invention]

3A to 3D are drawings showing the manufacturing process of one embodiment, in which A is a hoop material in which a molded substrate 22 is integrally inserted into a long thin metal lead plate 21 in the longitudinal direction. It is. The molded substrate 22 made of the hoop material A has a rib 29 and a molded rib base 24 provided with a U-shaped recess 23 on one side of the surface on which the head of the display element 15 such as a neon tube is placed. A hole 18 is formed in the center for inserting the central rib 5a of the operating handle 5, and three molded protrusions 25 for locking the resistor 17 are formed on the other side of the surface. It has been set up. And molded substrate 2
2. A part of the metal lead plate 21, which is formed by punching a metal lead plate 21 into an electric circuit, is inserted into the inside, and the inserted part and the surrounding metal lead plate 21 are connected by a connecting piece. The molded substrate 22 is integrally held by the hoop-shaped metal lead plate 21.

The hoop-shaped metal lead plate 21 is continuously fed out, and first, three connecting pieces protruding from one side of the molded board 22 are cut by the terminal forming device B, and a portion of each connecting piece is used to form the resistor 17. A terminal 26 for caulking and fixing the lead wire 20' of the display element 15, and terminals 28 for caulking and fixing one end of the lead wires 27, 27 of the display element 15 are formed. Next, the resistors 17 with both lead wires 20' and 20'' taped and aligned are sequentially fed into the molded projections 2 of the molded substrate 22 on the metal lead plate 21 by the resistor insertion machine C.
5, 25 and 25 are press-fitted and locked. In other words, in the embodiment, the molded substrate 22 has two molded protrusions on one side, and these two molded protrusions 25, 2
Consisting of one molded projection 25 arranged in parallel corresponding to the center position of 5, molded projections 25, 25 on both sides and 2
5, the resistor 17 is locked and fixed. At this time, one lead wire 20' of the resistor 17 is placed on the U-shaped portion of the terminal 26. Then, the lead wire 20' of the resistor 17 is caulked and fixed to the terminal 26 by caulking the U-shaped portion of the terminal 26 by a caulking machine D. After this caulking and fixation, the resistor 17 is
The other lead wire 20'' of the resistor 17 is bent vertically from the base and horizontal at the middle part.
The lead wire 20'' is bent at an angle of 45 degrees with respect to the molded substrate 22, so that the tip of the lead wire 20'' is located exactly at the center of the hole 8 of the molded substrate 22.Furthermore, after this process is completed, the display element 15 is bent. Two lead wires 27 are placed on the U-shaped portions of the terminals 28, 28, and the U-shaped portions are caulked by a caulking machine F and fixed to the terminals 28, 28. In the figure, G indicates taping. The display elements 15 are aligned and the parts supply machine
H is a cutting machine that cuts the lead wires 27, 27 of the display element 15 to a predetermined length; I is the lead wire 27, 27 of the display element 15 on the table of the parts supply machine J; This is a bending machine for bending the display element 15 at 90 degrees.

Now, as mentioned above, the lead wires 27, 27 are connected to terminal 2.
Since the display element 15 fixed by caulking to the leads 27 and 28 is in a vertical state at 90 degrees to the lead wires 27 and 27, the display element 15 is bent horizontally by the bending machine K in the next step. Lead wire 27,
27' is bent by 90 degrees, and the head of the display element 15 is fitted into the U-shaped recess 23 of the molded rib base 24, and the rib 29 is provided in parallel with the molded rib base 24.
Place the lower surface of the display element 15 on top of the display element 15.
is held on the molded substrate 22. Note that the inside of the U-shaped recess 23 may not be used, and the mounting surface of the molded rib base 24 may be made flat to receive the display element 15. In this way, the hoop-shaped metal lead plate 21 is sequentially moved, and the resistor 17 and the display element 15 are assembled and the respective lead wires 20', 27,
27 and the terminals 26, 28, 28, and before dividing each molded board 22, twist the hoop-shaped metal lead plate 21 at the The body 17 and display element 15 are placed on the lower side.

At this time, the resistor 17 has molded projections 25, 25, 25.
Because it is locked by the handle, it does not fall downward. This reversal makes it possible to easily cut the molded substrate 22 from the hoop-shaped metal lead plate 21 from above using a cutting die in the next step, and at the same time, the molded substrate 22
The purpose is to easily press fit the central rib 5a of the operating handle 5 into the hole 18 of the handle.

Now, after the above-mentioned reversal, the molded substrate 22 and the surrounding metal lead plate 21 are cut from above by the cutting mold of the cutting machine L.
The desired display circuit block is obtained by cutting off the connection piece with the display circuit block, and at the same time, this display circuit block is attached to the cut molded substrate 22 at the central rib 5a of the operating handle 5, which has been moved downward by the index table M. The molded substrate 22 is firmly fixed to the operating handle 5 by press-fitting the hole 18 using downward pressure during cutting. During this press-fitting, the lead wire 2 of the resistor 17
0'' tip is inserted into the hole 6 of the central rib 5a through the notch groove 5b of the central rib 5a of the operating handle 5. As shown in FIG. 4, the lamp cover 30 pulled out from the transparent material 31 is inserted into the hole in the ceiling surface of the operation handle 5 that is sent in order by the lamp cover insertion machine P, and then the index table M is inserted. The index table M receives the operating handle 5 at the location, detects the presence or absence of the operating handle 5 at the location with the detector Q, and then transports the index table M with the fiber insertion machine R at the location. A light-shielding fiber 33 cut out and bent in a U-shape from a light-shielding fiber material 32 is inserted into the operating handle 5 as shown in FIG. After detecting the posture, the above-mentioned molded substrate 22 is separated and press-fitted into the operating handle 5 at the position, the display circuit is checked for lighting at the position, and the product is taken out at the position. When taking out the products, the non-defective products and defective products selected during the above-mentioned lighting inspection are separated and taken out separately. to detect whether

By the way, a contact part 34 whose upper surface is covered with a molding material is formed at one end of the molded board 22 by protruding a part of the built-in metal lead plate 21, and the contact part 34 is connected to a fixed terminal board inside the switch. It comes into contact with 9 and separates.

Figures 5a to 5d show the process of forming electric circuits on the long metal lead plate 21, which is wound into a hoop shape.
A long metal lead plate 21 with a thickness of 0.2 m/m is punched and formed with an electric circuit section in the center using a punching machine U.As shown in Fig. 5b, the electric circuit has terminals 28 and 26 at both ends. The lead wire 27 of the display element 15 is provided between the terminals 28 and 28 formed in the above-described process. 27 is caulked and fixed, and the lead wire 20' of the resistor 17 is caulked and fixed to the terminal 26, a series circuit of the resistor 17, display element 15, and contact part 34 is formed via each electric circuit la, lb. be. 6a to 6d show that after the electric circuits la and lb have been formed as described above, a forming machine V is used to cover each electric circuit la and lb portion of the hoop-shaped metal lead plate 21 with a molded substrate 22. This figure shows a step of insert molding, in which molding rib bases 24, ribs 29, and molding protrusions 25, 25, 25 are provided during this insert molding. In the figure, numeral 35 is an interlayer paper inserted between layers when the hoop material A is wound up. Figure 7 a, b,
c is a top view of the molded substrate 22 taken out;
A front view and a sectional view are shown, and a dowel 36 that contacts the fixed contact plate 9 is provided on the lower surface of the contact portion 34.

The operating handle 5, on which the molded board 22 of the display circuit block is mounted as described above, is mounted inside the switch body 1 as shown in FIG. The half is inserted into the hole 6 of the central rib 5a and electrically connected to the lead wire 20'' of the resistor 17 inserted into the hole 6, and the contact portion 34 of the molded board 22 is inserted into the operation handle 5. It is arranged on the lower surface of the periphery, and comes into contact with and separates from the fixed terminal plate 9 in accordance with the operation of the operating handle 5. In the figure, 37 is a release button, and 38 is a screwdriver insertion hole. It is a perspective view which shows the state where the resistor 17 in an example is locked by the molded protrusion 25,25,25.

It should be noted that the resistor 17 can be locked in place by the three molded protrusions 25, 25, 25 in the above embodiment, for example, by the tenth molded protrusion.
The resistor 17 may be press-fitted between the molded rib bodies 39, 39 parallel to FIGS. 3 in the diagram
9a is a recess into which the resistor 17 is fitted.

Further, as shown in FIG. 12, a part of the metal lead plate 21 inserted into the molded board 22 is used to form a holding piece 21a, and the holding piece 21a and the molded rib body 40 hold the resistor 17 on both sides. It may also be locked from. FIG. 13 shows an embodiment in which the molded rib body 40 and the presser piece 21a of FIG. 12 are placed on opposite sides.

Also, as shown in FIG. 14, the molded rib body 37 is not used, and the metal lead plate 21 is used to hold the holding pieces 21a, 21 in parallel.
a' may be formed, and the resistor 17 may be locked between the holding pieces 21a and 21a'.

Furthermore, as shown in FIG. 15, a part of the metal lead plate 21 may be curled, and the resistor 17 may be inserted into the curled portion 21b and locked therein.

Furthermore, as shown in FIGS. 16a and 16b, molded projections 41, 41, 41 having an arcuate cross section are protruded on the same circumference so as to have a cylindrical shape, and these molded projections 41, 4
The resistor 17 may be press-fitted into the space surrounded by 1 and 41 and locked therein.

〔Effect of the invention〕

In the present invention, as described above, the molded substrate is formed on the long metal lead plate by simultaneous molding, so it can be handled as a hoop-shaped member and a desired display circuit block can be manufactured through an integrated continuous process. Therefore, compared to the case where individual blocks are manufactured individually, quality can be stabilized and costs can be reduced.Furthermore, when dividing a display circuit block from a long metal lead plate, it is possible to Because it is press-fitted into the handle (handle), it can be press-fitted in parts in one step, which has the effect of reducing the number of steps.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a switch using a conventional example, Figures 2 a and b are front and side views of the conventional example, and Figure 3 a
- d are explanatory diagrams of the process of the present invention, Fig. 4 is an explanatory diagram of assembly of the operating handle used in the above, and Figs. Figures 7a to 7c are top views and front views of the molded substrate portion of the same as above, and X-X'-Y-
Y'-Z-Z' sectional view, FIG. 8 is a sectional view of a switch using one embodiment of the present invention, FIG. 9 is a perspective view of the same main part, and FIG. 10 is a main part of another embodiment of the present invention. FIG. 11 is a front view of the same as above, FIG. 12 is a perspective view of main parts of another embodiment of the present invention, FIG. 13 is a perspective view of main parts of a modification of the same as above, and FIG. 14 is a front view of the same as above. FIG. 15 is a perspective view of a main part of still another embodiment of the present invention, FIGS. 16 a and b are a top view of a main part and a perspective view of a main part of still another embodiment. is a diagram,
5 is an operation handle, 15 is a display element, 17 is a resistor, 20', 20'' are lead wires, 21 is a metal lead plate, 22 is a molded substrate, 24 is a molded rib base, 25 is a molded protrusion, 26 is a terminal, 27 is a lead wire, and 28 is a terminal.

Claims (1)

[Claims] 1. A direction in which a long metal lead plate is sequentially unwound by punching out electrical circuits for a display circuit at equal intervals in the longitudinal direction, forming a molded substrate by insert molding in each electrical circuit portion, and winding it into a coil shape. A terminal forming step is performed in which a part of the connection piece that connects the electric circuit part inside the molded board and the metal lead plate part outside the molded board is cut, and a terminal for caulking and fixing is formed. a resistor mounting step of locking the resistor to the locking means; a lead wire crimping step of caulking and fixing one lead wire of the resistor to the corresponding terminal created in the terminal forming step; A process of bending the remaining lead wires, a process of caulking both lead wires of the display element to the corresponding terminals created in the terminal forming process, and a process of bending both lead wires so that the display element is placed on the molded rib stand. After the bending step, the molded substrate portion is divided from the long metal lead plate to obtain a display circuit block, and at the same time, the display circuit block is press-fitted into a predetermined member by the cutting pressure at the time of division. A method for manufacturing a display circuit block.