JPH05283225A - Magnetic coil device, its manufacture and manufacturing equipment - Google Patents

Abstract

PURPOSE:To improve the reliability for connections and permit automation by enhancing the workability of connecting work between the lead wires from a magnetic coil and external lead wires. CONSTITUTION:A pair of connecting terminals 5 comprising conductive bodies are fixed to an outer end portion of a flange portion 1b of a bobbin 1, lead wires 2a and 2b at the beginning and end of an electromagnetic coil 2 wound around the bobbin 1 are wound around the rear ends of corresponding connecting terminals 5, these connecting terminals 5 are dipped into solder, and ends of lead wires 3 overlapped with the connecting terminals 5 are respectively spot-welded with a pair of tungsten or molybdenum electrodes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic coil device for a micro clutch used in office automation (OA) equipment, a method of manufacturing the same, and a manufacturing apparatus therefor.

[0002]

2. Description of the Related Art FIG. 4 is a front view of a conventional electromagnetic coil device. In the figure, reference numeral 1 denotes a bobbin made of a synthetic resin molded product, in which a cylindrical winding portion 1a and both side flange portions 1b are integrally formed. The flange portion 1b is provided with a pair of cutout portions 1c. Reference numeral 2 denotes an electromagnetic coil wound around the winding portion 1a, which has a lead wire 2a at the beginning of winding and a lead wire 2 at the end of winding.
b and are issued. A pair of lead wires 3 made of a copper stranded wire and provided with an insulating coating supplies a current from a power source (not shown) to the electromagnetic coil 2. The lead wire 2a is connected to one lead wire 3, and the lead wire 2b is connected to the other lead wire 3.
Are connected.

FIG. 5 shows a connecting portion between the lead wire 3 and the lead wires 2a and 2b. The lead wire 2a (2b) is wound around the end of the lead wire 3 several times, and the outer circumference thereof is soldered and connected using a soldering iron. Reference numeral 4 is a cross section of solder. The connection between the lead wire 3 and the leads 2a and 2b is performed manually.

[0004]

The above-mentioned conventional electromagnetic coil device has the following problems. (1) Winding the lead wire 2a (2b) around the lead wire 3,
The soldering of this part can be done only by hand, the work efficiency is extremely low, and labor can not be saved. (2) Since the lead wire 3 and the lead wires 2a and 2b are connected only by soldering, the holding force against the movement of the lead wire 3 is small and the connection reliability is low.

The present invention has been made in order to solve such a problem, and the lead wire of the electromagnetic coil and the external lead wire are automatically connected to each other to improve the productivity and to improve the connection portion. It is an object of the present invention to provide an electromagnetic coil device which is strongly connected to withstand high temperatures and has improved reliability, a manufacturing method thereof and a manufacturing device thereof.

[0006]

SUMMARY OF THE INVENTION In an electromagnetic coil device according to the present invention, a pair of contact terminals are projected and fixed to the outer end of a flange of a bobbin so that the winding start of the electromagnetic coil wound around the bobbin can be improved. Wrap the lead wire and the lead wire at the end of the winding around the rear end side of the corresponding contact terminal, attach solder to this connection terminal, and spot weld a lead wire consisting of a stranded wire to the tip side of each contact terminal. It is connected by.

In the electromagnetic coil manufacturing apparatus according to the present invention, the bobbin flange is projectingly secured to the outer end of the flange, and the lead wire of the electromagnetic coil is wound around the rear end of the bobbin and soldered to the connection. A welding machine provided with a pair of electrodes made of tungsten or moridene fixed to a holder made of copper material, facing the terminals from both sides;
One of the electrodes is a flat end face and presses one side of the connection terminal,
The other electrode is formed by spot welding on a groove for receiving the lead wire, which is provided on the end face, is overlapped and pressure-contacted with the other side surface of the connection terminal for receiving the end portion of the lead wire.

[0008]

In the present invention, the lead wire of the electromagnetic coil is wound around the connection terminal projecting from the outer end portion of the bobbin flange, and the winding wire is automatically wound by the winding machine. By soaking the connection terminal in this state in the molten solder layer, automatic soldering is performed. Further, by superposing a lead wire on the connection terminal, sandwiching it with a pair of electrodes, press-contacting and energizing the lead wire, the lead wire is spot-welded to the connection terminal and automatically and firmly connected.

Further, in the electromagnetic coil manufacturing apparatus of the present invention, the electrodes of the welding machine are made of tungsten or molybdenum, and are fixed inside the holding electrodes made of copper material, and the ends of the leads are superposed on the connection terminals. Both sides are pressure-welded and spot-welded, and both are instantly crimp-welded. Moreover, solder does not adhere to each electrode end face side, and cleaning work of the electrode end face is not required after welding.

[0010]

【Example】

Example 1. FIG. 1 is a sectional view of an electromagnetic coil device according to an embodiment of the present invention. 1 is a synthetic resin molded product, and is a bobbin having a winding portion 1a and flanges 1b on both sides, and a pair of protrusions 1d is formed on the outer end portion of one flange portion 1b. Reference numeral 5 denotes a pair of connection terminals composed of square pole pins made of a conductive material, which are fitted and fixed to the respective projections 1d. The lead wire 2a at the beginning of winding of the electromagnetic coil 2 is wound several times around the rear end side of one connection terminal 5, and the lead wire 2b at the end of winding is wound around the rear end side of the other connection terminal 5 several times. It is wrapped. The ends of the lead wires 3 are overlapped on the tip end side of each connection terminal 5, and they are pressure-welded and connected by spot welding. The state of this connection is shown in FIG.

The electromagnetic coil device is manufactured as follows. The connection terminal 5 is press-fitted and fixed to the protrusion 1d of the flange 1b of the bobbin 1. The electromagnetic coil 2 is wound around the bobbin 1 by an automatic winding machine. Then, by using an automatic winding machine, the lead wire 2a at the beginning of winding is wound around the rear end side of one connection terminal 5 several times, and the lead wire 2b at the end of winding is placed at the rear end side of the other connection terminal 5. Wind several times. In this state, the connection terminal 5 is put in a molten solder bath and soldered. Next, as shown in FIG. 2, the tip end of the stranded wire of the lead wire 3 is overlapped on the tip end side of the connection terminal 5 with an inclination of about 20 °, and a welding machine (not shown) 1
It is sandwiched from both sides by a pair of electrodes, pressure-welded, instantaneously energized, and spot-welded.

Next, the manufacturing apparatus will be described. FIG. 3A shows a state in which the lead wire 3 is superposed on the connection terminal 5 and sandwiched by a pair of electrode parts of the welding machine. Solder 4 is attached to the connection terminals 5. 6 is one holding electrode made of a copper material, and an electrode 7 made of tungsten or molybdenum is fixed in the end portion, and this end face is the same as the end face of the holding electrode 6 or about 1 mm.
The following allowable protrusion range is set. Reference numeral 8 is the other holding electrode made of a copper material, and an electrode 9 made of tungsten or molybdenum is fixed in the end portion. As shown in FIG. 2, the end surface of the electrode 9 protruding from the end surface of the holding electrode 8 is provided with a receiving groove 9a for receiving the end portion of the lead wire 3 in an inclined state. The end portion of the lead wire 3 is inserted into the receiving groove 9a and positioned. The connection terminals 5 to which the solder is attached are superposed and positioned on the lead wires 3. After that, one of the holding electrodes 6 and the electrodes 7 is lowered and set to the position of FIG. next,
Spot welding is performed with a pressure of 24 kg, a current of 2100 A, and an energization time of 19 ms. As a result, as shown in FIG.
The lead wire 3 and the connection terminal 5 are firmly connected. In addition,
The electrodes 7 and 9 are made of tungsten or molybdenum, and the solder attached to the connection terminal 5 does not attach to the electrodes 7 and 9 during spot welding.

[0013]

As described above, according to the present invention, a pair of connecting terminals made of a conductor is fixed to the outer end of the flange of the bobbin, and the lead wires at the start and end of the electromagnetic coil are wound. Each of them is wound around the rear end side of the corresponding connection terminal, the connection terminal is dipped into solder, the end of the lead wire is overlapped with the tip side of the connection terminal, and both are spot welded and connected. The output wire can be wound around the connection terminal with a table winding machine, and the soldering of the connection terminal portion and the welding of the lead wire and the connection terminal can be automated, which improves work efficiency and saves labor.

Further, since the lead wire of the electromagnetic coil is wound around the connection terminal and soldered, and the lead wire is spot welded to the connection terminal, the reliability of connection is improved.

Furthermore, since the connection terminal and the lead wire are pressed and spot-welded between a pair of electrodes made of tungsten or molybdenum, solder does not adhere to the electrode end faces, and maintenance of their removal is not required. The property is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic coil device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a connection terminal portion of FIG.

3 (A) is a cross-sectional view showing a state in which it is sandwiched by a pair of electrodes of a welding machine for connecting the connection terminal and the lead wire of FIG. 2,
FIG. 6B is a sectional view showing a state in which the connection terminal and the lead wire of FIG.

FIG. 4 is a front view of a conventional electromagnetic coil.

5 is an enlarged cross-sectional view of a connecting portion between a lead wire and a lead wire of the electromagnetic coil of FIG.

[Explanation of symbols]

 1 bobbin 1a winding part 1b flange part 1d protrusion 2 electromagnetic coil 2a lead wire at the beginning of winding 2b lead wire at the end of winding 3 lead wire 4 solder 5 connecting terminal 6, 8 holding electrode 7, 9 electrode 9a receiving groove

Claims (3)

[Claims] 1. A bobbin made of a synthetic resin molded product, having a tubular winding portion, flange portions on both sides, and a pair of protrusions at the outer end portion of one flange portion. It is wound around the winding part and consists of an electromagnetic coil with a lead wire at the beginning and end of the winding, a conductive material, and is fixedly attached to each protrusion of the bobbin. Each of the output wires is wound around the rear end side and is provided with a pair of connection terminals to which solder is attached, and the end portion of the external lead wire having a core wire made of a stranded wire is overlapped with the tip end side of the connection terminal by spot welding. The electromagnetic coil device that is formed. 2. A step of winding an electromagnetic coil around a bobbin,
On the rear end side of the pair of connection terminals made of a conductive material, which are fixed to the pair of protrusions on the outer end of the one flange portion of the bobbin, the corresponding winding start lead wire of the electromagnetic coil is provided. The step of winding each of the lead wires at the end of winding, the step of hitting the connecting terminal with solder in this state, and the end of the external lead wire whose core wire is a stranded wire to the tip side of the connecting terminal. A method for manufacturing an electromagnetic coil device, which comprises a step of spot welding. 3. A pair of connecting terminals fixed to the outer ends of one of the flanges of the bobbin, at the rear ends of the pair of connection terminals, corresponding openings at the beginning and end of winding of the electromagnetic coil wound around the bobbin. A state in which wires are wound and solder is applied to the connection terminals, and the ends of a pair of external lead wires, each of which has a stranded core wire, are superposed on the tip ends of the connection terminals. Then, a welding machine for spot-welding both of them is sandwiched between a pair of electrodes made of tungsten or molybdenum, and the one electrode is fixed in a holding electrode made of a copper material, and a flat end face of the connection terminal is used. One side part is pressure-contacted, the other electrode is fixed in a holding electrode made of a copper material, and the end portion of the lead wire is received and pressure-contacted in a receiving groove formed on the end face. Manufacturing equipment.