JPH0120411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing eyeglasses, and more specifically, a resistance welding electrode is pressed into contact with each of a hinge consisting of a male mold and a female mold, which are rotatably assembled in advance. The present invention relates to a method of manufacturing eyeglasses that allows the hinge to be suitably fixed to the temple.

As shown in FIGS. 1 and 2, the eyeglass frame is composed of various parts such as a temple 2, a brooch 4, a hinge 6, a rim 8, and a bridge 10. When assembling, these various parts must be joined by methods such as welding. temple 2
The hinge 6 for bending this is also no exception. The hinge 6 is generally composed of a male mold 6a and a female mold 6b, and the protrusion 14 of the hinge 6a in which the circular hole 13 is bored is connected to the bifurcated protrusions 15a and 15b of the female mold 6b. It fits into the recess 16 thus formed. Then, the mold release 6a is fixed to the relatively long temple member 2a, and the female mold 6
b is fixed to a relatively short temple member 2b that connects the broach 4. In addition, in the figure, reference numeral 1
8 indicates a circular hole defined in the projections 15a, 15b of the female mold 6b, and reference numeral 20 indicates a circular hole 13,
18, and reference numeral 22 designates a disc-shaped nut that is screwed onto the bolt 20.

In the above configuration, the temple member 2a
By fixing the hinge 6, the temple member 2b
bending operation is possible. Therefore, when using or handling the glasses, the temple member 2a or the temple member 2b must not come off the hinge 6, and when manufacturing them,
If the hinge 6 is fixed in a position deviated from the predetermined position, not only the normal function of the hinge 6 or the temple 2 may be impaired, but also the condition is aesthetically undesirable. Ultimately, the hinge 6 must be fixed at a predetermined position on the temple 2 with a predetermined bonding strength. Like this, hinge 6 on temple 2
Conventionally, the following methods have been used for fixing.

That is, as shown in FIG.
is initially in a state where the temple members 2a and 2b are integrated and bent at the portion where the hinge 6 is attached. A groove into which the temple 2 is appropriately fitted is provided on the upper surface of the lower electrode 24, and the temple 2 is fitted into this groove to position it on the lower electrode 24. In this case, in advance,
Projections 26a and 26b are formed at predetermined positions on the upper surface of the temple 2. Then, the hinge 6 is placed on top of this, and then the upper electrode 28 is lowered from above the hinge 6 to bring the tip of the electrode into contact with the hinge 6, and then the upper electrode 28 is applied downward to the hinge 6. The upper electrode 2 is pressed while applying directed mechanical pressure to the projections 26a, 26b.
A large current is passed between 8 and the lower electrode 24. As a result, the projections 26a and 26b melt, and together with the pressurizing force, the hinge 6 and the temple 2 are welded together. After projection welding is completed in this manner, the temple 2 is cut along the rotating portion of the hinge 6, as shown by the broken line. Eventually, the temple 2 is separated into a relatively long temple member 2a and a relatively short temple member 2b, and the hinge 6
This will result in a rotatably connected state.

However, in the prior art, the upper electrode 28
Since the tip of the electrode constituting the electrode is single, the welding current is divided by the hinge 6 and flows to the lower electrode via the projections 26a and 26b. Therefore, the shape of the projections 26a, 26b,
This results in different welding effects depending on processing accuracy such as size and thickness. That is, when the progeexion 26a is thicker than the progeexion 26b, when the electrode 28 is lowered and brought into pressure contact with the hinge 6, the tip of the electrode comes into contact with the hinge 6, and the mechanical pressure causes the electrode to contact the hinge 6. The position of the hinge 6 may shift. On the other hand, Projection 2
If 6, 26b or the male mold 6a and the female mold 6b have different electrical resistances, the current will flow in the direction of the part with the lower resistance value, and the remaining parts will not be sufficiently melted, resulting in a reliable welding state. is not obtained. In the end, according to the prior art, the hinge 6 could not be fixed in a predetermined position, and a predetermined joint strength could not be obtained.

The present invention has been made to overcome the various disadvantages described above, and includes, for example, separating the upper electrodes on the hinge side of the welding machine so that they are separate bodies,
A current of a predetermined value is applied to each electrode from a power source, and a pressure balance device is used to press the hinge against the lower electrode at the same pressure, thereby welding the hinge and the temple under the same pressure. The purpose of the present invention is to provide a method for manufacturing eyeglasses.

In order to achieve the above-mentioned object, the present invention further divides at least one of the first electrode and the second electrode arranged oppositely into a plurality of electrodes, and each divided electrode has a male type and a male type in contact with the temple. The method is characterized in that the hinge and the temple are welded together by projection welding by press-contacting each part of the female hinge and applying electricity to the divided electrodes.

Next, regarding the method for manufacturing glasses according to the present invention,
Preferred embodiments will be described in detail below with reference to the accompanying drawings, in relation to the apparatus for implementing them.

In FIG. 4, reference numeral 40 indicates a lower electrode for resistance welding, and this lower electrode 40 has a recess 44 extending in a straight line for properly positioning and holding the temple 42. The temple 42 does not need to be pre-bent where it is to be cut, it can simply be separated and the temple members 46a, 46b
The cut surface 48a of the temple member 46a and the cut surface 48b of the temple member 46b are brought into surface contact and positioned and held within the recess 44.

Next, the male mold 52a and the female mold 5 constituting the hinge 50 are
A bolt 54 for making the male mold 52a and the female mold 52b mutually rotatable is inserted in advance into the hole that integrally penetrates the male mold 52a and the female mold 52b. Type 52b to temple 42
Place it in the specified position on the top surface of the In that case, instead of the projection, use Temple 42 or
Metal foils 56a and 56b made of the same material as the hinge 50 are attached to the temple 4 in correspondence with the male mold 52a and the female mold 52b.
2.

In the setting state as described above, the upper electrodes 58a and 58b, which are configured separately, are lowered from above, and the upper electrodes 58a and 58b are connected to the male mold 52.
a. It is pressed against the female mold 52b in the state shown in FIG. In addition, so as not to be easily understood from the diagram,
In this case, the tips of the upper electrodes 58a and 58b are formed to be inclined so as to closely contact the inclined surfaces of the male die 52a and the female die 52b as workpieces.

Next, a predetermined current is applied to the upper electrodes 58a, 58b.
Electricity is applied between the lower electrode 40 and the lower electrode 40 . As a result, the foils 56a and 56b are melted and the hinge 50 and temple 42 are welded together.

Note that when projection welding is performed as described above, the separated upper electrodes 58a and 58b
In order to equalize the mechanical pressure applied to the male die 52a and the female die 52b, a pressure balance device 60 as shown in FIG. 6, for example, can preferably be used. The pressure balance device 60 is
As can be easily understood from the figure, guide members 63a, 63b are passed through the main body 61, and holding members 65a, 65 are attached to the tips of the guide members 63a, 63b.
Electrodes 58a and 58b are fixed via 5b. In this case, coil springs 67a, 67b
are selected with the same elastic force. The pressure balance device 60 configured in this way always has the electrode 5
8a and 58b with the same pressure to form the male mold 52a and the female mold 52.
A suitable welding effect can be obtained because of the contact with b.

In this case, in the method of the present invention, as shown in FIG. 7, there are two power supply systems on the secondary side that supply current to the upper electrodes 58a and 58b. That is, in the figure, reference numerals 70a and 70b indicate primary-side power supplies, and transformers 72a and 72b are connected to the power supplies 70a and 70b. In this case, one secondary output terminal of the transformer 72a is connected to the upper electrode 58a.
Similarly, one secondary output terminal of the transformer 72b is connected to the upper electrode 58b. Further, the other secondary terminals of the transformers 72a and 72b are both connected to the lower electrode 40.

In such a circuit configuration, the primary side power supply 7
The number of turns of the primary and secondary coils of the transformers 72a and 72b is appropriately selected according to the resistance welding process 0a and 70b, and the low voltage and large current required for the resistance welding is obtained at the secondary output of each transformer. For example, power supply 70
If a and 70b are the same power source or a power source with similar output, the number of turns of the primary coil of each transformer 72a and 72b is the same and larger, while the number of turns of the secondary coil of each transformer 72a and 72b is increased. By keeping the number of turns the same and decreasing the number of turns, the foils 56a, 56b
It is possible to supply low voltage and large current equal to .
Therefore, the foils 56a and 56b are in a similar melted state, and the male mold 52a and the female mold 52b can be welded to the temple members 46a and 46b with a predetermined bonding strength. In addition, by controlling the power supply system on the secondary side according to the resistance values of the foils 56a, 56b, the male mold 52a, the female mold 52b, etc., it is possible to create more diverse types of hinges and projections. It also becomes possible to easily perform resistance welding that provides a predetermined joint strength.

As described above, according to the present invention, by using an electrode divided into two as one electrode,
The current is supplied by separate power supply systems for each. As a result,
It becomes possible to fix the male and female parts of the hinge in a predetermined position on the temple with a desired bonding strength. Moreover, since the mechanical pressures applied to the male and female parts of the hinge are equal, there is an advantage that the joint strength is also equal. Moreover, since the temple members separated in advance are joined and welded in this state, there is no need to apply a fixing liquid to the hinge and precisely cut the temple itself.
In addition, since the lower electrode on the temple side can be made into a simpler shape than conventional lower electrodes, it is easier to manufacture this lower electrode, and the accurate position and angle setting with respect to the upper electrode is easier. It becomes easier to do. Therefore, it is possible to easily provide an eyeglass frame that is excellent both mechanically and aesthetically.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

Figure 1 is a partially omitted perspective view of the eyeglass frame;
The figure is a partially omitted exploded perspective view to explain the combination of the temple and hinge of the eyeglass frame.
The figure is a partially longitudinal front view for explaining the process of joining a hinge and a temple according to the prior art, and FIG. Fig. 5 is a partially omitted front view showing the temple, hinge, and electrode of a resistance welding machine when carrying out the method of the present invention, and Fig. 6 is a diagram showing the pressure used when carrying out the method of the present invention. An explanatory diagram of the balance device, Figure 7 shows the power supply of the resistance welding machine
FIG. 2 is a schematic diagram of a systematic circuit. 40... lower electrode, 42... temple, 44...
...Recessed portion, 46a, 46b...Temple member, 48
a, 48b...cut surface, 50...hinge, 52a...
...Male type, 52b...Female type, 54...Bolt, 56
a, 56b... foil, 58a, 58b... upper electrode, 60... pressure balance device, 61... main body,
63a, 63b...Guide member, 65a, 65b
...Holding member, 67a, 67b...Coil spring, 70a, 70b...Power supply, 72a, 72b
...Transformer.

Claims (1)

[Claims] 1. At least one of the first electrode and the second electrode arranged opposite to each other is further divided into a plurality of parts,
The method is characterized in that each divided electrode is pressure-contacted to a respective part of a hinge consisting of a male mold and a female mold that is in contact with the temple, and the divided electrodes are energized to weld the hinge and the temple by projection welding. A method for manufacturing eyeglasses. 2. In the method described in claim 1,
A method for manufacturing eyeglasses, which comprises supplying current to each electrode divided into a plurality of parts from a separate power supply system. 3. In the method described in claim 1,
A method of manufacturing eyeglasses, which comprises pressing electrodes, each of which is divided into a plurality of parts, into contact with male and female parts of a hinge via a pressure balance device.