JPS61206579A - Production of spectacles - Google Patents

Abstract

PURPOSE:To perform the resistance welding of a broaching member and rim without spoiling the beauty with melting the projection part by forming the groove to fit a rim to a broaching member, by forming a projection part as well on the groove part and by electrifying the projection part with the pressure welding of electrode to the broach member and rim. CONSTITUTION:A projection part 34 is formed simultaneously by rotary bit 28 with forming the groove part 26 for fitting a rim 36 to broach 22. And the rim 36 and broach 22 are unified with projection welding by the linear projection part 34. It is therefore unnecessary to control the temp. with watching the color of the heated brazing filler metal, nor the beauty is spoiled by the leakage of the excess brazing filler metal. Moreover the product of excellent external appearance can be made by not only enabling to avoid from the accident of welding break away, etc. but also making the finish beautiful with the broach 22 and rim 36 being composed of the pure titanium of the same quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing eyeglasses, and more particularly, the present invention relates to a method for manufacturing eyeglasses, and more particularly, a method for manufacturing eyeglasses, in which a projection is made between a rim that supports an eyeglass lens and a so-called brooch that fits into this rim and holds a part of a temple. The present invention relates to a method of manufacturing eyeglasses for obtaining eyeglass frames by welding.

In recent years, methods of manufacturing eyeglass frames using metals containing titanium have become widespread. In particular, 10 glasses frames
If it is made of 0% titanium, it is suitable for frames made of composite titanium containing cladding materials because it promotes further weight reduction, and it also increases the rigidity, making it several orders of magnitude stronger than conventional eyeglass frames. The reason for this is its superiority.

Incidentally, as shown in FIG. 1, an eyeglass frame is a device composed of various parts such as a temple 2) a brooch 4, a hinge 6, and a rim 8.
When assembling O, these various parts must be joined. The rim 8.8 holding the spectacle lens 12 and the brooch 4.4 for attaching the temple 2.2 are no exception to this. In this case, in the prior art, a brazing method has been adopted when joining various parts constituting the eyeglass frame 10.

Therefore, when brazing eyeglass frames made of titanium, the heating temperature is increased to about 1000° C., and when this temperature is exceeded, titanium itself becomes nitrided and becomes brittle. Moreover, this temperature is generally determined by the luminescent color of the brazing material, which changes depending on the heating temperature, making temperature control difficult and exposing the drawback that quality cannot be guaranteed. Moreover, brazing requires considerable skill, and furthermore, brazing is inferior from an aesthetic point of view because the brazing filler metal 14 flows out and solidifies into unnecessary areas during the brazing process. (See Figure 2).

On the other hand, the rim 8 and the broach 4 are joined to each other, and a small diameter bolt 16 is screwed into a screw hole drilled in the broach 4 to attach the part 2a of the temple 2. And rim 8
, broach 4, etc., are all made as small as possible.

Therefore, attempts have been made to use resistance welding to join these relatively small parts all at once, but this requires an extremely large current to join the broach and the rim together. Another disadvantage is that it damages the surface of the welding base material, making it unusable.

SUMMARY OF THE INVENTION The present invention has been made to overcome the various disadvantages mentioned above, and includes defining a groove in a brooch for receiving a rim, forming a projection in the groove, and providing a large projection for the projection. The object of the present invention is to provide a method for manufacturing eyeglasses in which the broach and the rim are resistance welded by melting the brooch by passing an electric current through the rim.

To achieve the above object, the present invention provides an eyeglass frame including a rim for carrying an eyeglass lens and a brooch for attaching a temple to the rim, the brooch member defining a groove for fitting the rim, A protrusion is formed in the groove, and then an electrode is pressed against the broach member and the rim, and electricity is applied to the protrusion to melt it, thereby resistance welding the broach member and the rim. .

Next, preferred embodiments of the method for manufacturing eyeglasses according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 3, reference numeral 20 indicates the material of the brooch 22 for constructing the eyeglass frame.
is preferably made of pure titanium, i.e., 100% titanium, and is pre-drilled with a screw hole 24 passing through it in its longitudinal direction.

If one side 22a of the brooch 22 is curved to match the shape of the rim, which will be described later, an aesthetically pleasing effect can be obtained. Therefore, the brooch 22 formed in this way has
As shown in FIG. 4, a groove 26 is defined, as shown in chain lines, for fitting and welding the curved rim. This groove 2
6, preferably the bite 28 is used (
(See FIG. 4), the groove portion 26 is formed in the side portion 22a by rotating the cutting tool 28. in this case,
A V-groove notch 32 is defined in the tip 30 constituting the tip of the broach 22, and the side part of the broach 22 is rotated continuously at high speed by a rotational drive source (not shown). 22a is cut to define a groove portion 26. As a result, a linear projection 34 having the same curvature as the groove 26 is formed on the broach 22 by the cutting process (
(See FIG. 5) After such a protrusion 34 is obtained, a rim 36 is fitted into the groove 26. As a result, it will be easily understood that the rim 36 constituting the eyeglass frame comes into line contact with the brooch 22 through the linear protrusion 34.

Therefore, in such a setting state, one electrode 38a is brought into contact with the broach 22, and the other electrode 38a is brought into contact with the rim 36.
b. Next, when a predetermined current is passed from the one electrode 38a to the other electrode 38b, this current flows through the linear protrusion 34 formed on the broach 22 to the rim 36 side.

In this case, the linear protrusion 34 plays the role of a projection in projection welding, and this portion is intensively heated and melted, allowing the rim 36 and the broach 22 to be easily welded together. In addition, in the figure, reference numeral 40 indicates a temple that is screwed onto the brooch 22.

According to the present invention, when defining the groove for attaching the rim to the broach as described above, a protrusion is simultaneously formed using a rotating bit, and the rim and broach are projection welded using this linear protrusion. This makes it possible to achieve integration. Therefore, there is no need to control the temperature while checking the color of the heated brazing material as in brazing, and excess brazing material generated during brazing leaks outside, which may later affect the aesthetic appearance of the eyeglass frame. It won't be damaged, and if the brooch and rim are made of the same titanium,
Not only can you avoid accidents such as welding peeling, but also the finish is extremely beautiful, so
For products such as eyeglass frames where design is important, it is also possible to provide an excellent appearance.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to the above-mentioned embodiments. It is also possible to form the protrusions in different steps without departing from the gist of the present invention, and the same effect can be obtained even if the protrusions in the grooves are bulged in a hemispherical shape. Of course, improvements and changes in design are possible.

[Brief explanation of drawings]

FIG. 1 is an overview perspective view showing a state in which an eyeglass frame and a lens attached to the eyeglass frame are connected, and FIG. 2 is a partially omitted perspective explanatory view showing a state in which a rim of an eyeglass frame and a brooch are connected according to the prior art. FIG. 3 is a perspective view of the broach according to the present invention before cutting, FIG. 4 is a perspective explanatory view of the broach shown in FIG. 6 is an explanatory diagram of projection welding of the broach and rim according to the present invention, and FIG. 7 is a diagram showing projection welding of the broach and rim, and then screwing a part of the temple together. FIG. 20...Material 22...Broach 24...Threaded hole 26...Groove 28...Bite
30...Tip 32...Notch 34...Protrusion 36...Rim 38a, 38b --
Electrode 40...Temple FIG, 3/-\38a

Claims (3)

[Claims] (1) In a spectacle frame including a rim for supporting a spectacle lens and a brooch for attaching a temple to the rim, a groove portion into which the rim fits is defined in the brooch member, and a protrusion is formed in the groove portion; Next, an electrode is pressed against the broach member and the rim, and electricity is applied to the protrusion to melt the protrusion, thereby resistance welding the broach member and the rim. (2) A method for manufacturing eyeglasses according to claim 1, wherein the groove and the protrusion are simultaneously formed by rotating a cutting tool that defines a recess corresponding to the protrusion. (3) A method for manufacturing eyeglasses according to claim 1 or 2, in which the brooch and the rim are made of titanium.