JPS62208917A - Manufacture of spectacle frame composed of thermoplastic resin material - Google Patents

Abstract

PURPOSE:To obtain a spectacle frame provided with a connecting recessed groove of a lens, by a method wherein a core template which possesses a form of the lens circumference on its outside circumference and is composed of resin having appropriate hardness and elasticity is interposed into the groove of the inside circumference of a female mold on the inside of which a form of the spectacle frame is provided in a recessed state and the resin is filled into the female mold through injection. CONSTITUTION:An injection molding machine is equipped with a hard and elastic core template 2 which possesses the protruded fringe F, whose outside circumference is in conformity with a form of a lens circumference, and is composed of a ethylene fluoride resin having the high fusion point of 327 deg.C in a state wherein the protruded fringe F has been interposed into a groove H of the inside circumference of a hollow part of a female mold 1 having a hollow part coinciding with an external form of a pair of circular ring form spectacle frame on the inside. The inside of the hollow part R is filled with nylon resin P having the low fusion point of 185 deg.C-215 deg.C through injection, the resin cooled and solidified is removed from the female mold 1 along with the core template 2 and then the core template 2 is removed outside from a molded form by being bent. A frame 3 on which a lens frame connecting recessed groove V has been formed is obtained in this manner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on manual or mechanical secondary work such as post-molding machining of a grooved frame edge for lens mounting on an eyeglass frame edge made of a so-called thermoplastic resin material such as a synthetic resin. The present invention relates to a simple and efficient method for manufacturing an eyeglass frame edge with grooves, in which the frame edge is formed at the same time as the frame edge.

Conventionally, eyeglass frame edges made of molded articles of synthetic resin, celluloid, etc. are first made into a female mold with a hole in the desired frame line shape, such as the original shape of the frame edge, such as a bicyclic or bielliptic shape. A synthetic resin is filled into the molten state, and then it is cooled. When the resin is molded and solidified, the frame edge molded body is removed from the female mold, and next, the frame edge molded body is attached to the inner periphery of the frame edge of the molded body. This requires two steps to mechanically cut the outer periphery of the lens.

However, it is not only inefficient in terms of manufacturing to add grooves to the frame edges formed in this way, but the grooves in particular require skilled techniques, which is why it is often difficult to do so. It also has the disadvantage that it tends to result in lost product and thus makes the product expensive.

The present invention has been made as a result of research to eliminate the above-mentioned disadvantages, and has succeeded in obtaining a highly efficient and accurate eyeglass frame rim with grooves by the following method.

That is, as described below for convenience, a female mold 1 is provided in which the frame edge-shaped cavity R of circular eyeglasses is concavely formed as shown in the figure, and the center shaft is inserted into the inner circumferential groove H of the cavity of the female mold. The cavity of the female mold in the injection molding machine is installed on a line with a 327° C. flange F that approximately conforms to the inner circumferential shape of the rounded cavity, has appropriate hardness and elasticity, and has a flange F at 327°C. Nylon resin with a melting point lower than that of the material of the stretcher template 2, for example, 185°C to 215°C, polycarbonate resin with a melting point of 200°C to 300°C, or nonflammable celluloid with an even lower melting point of 140°C is injected and filled in a molten state in part R. After that, the filled resin is cooled down to 70℃ in a short time.
When the temperature is lowered to ~80°C and solidified to form the frame edge molded body 3, when one side of the stretcher template 20 assembled with the frame edge molded body is pressed from the female mold 1, the flexibility of the stretcher template is Due to its nature, it bends in a curved shape (see Fig. 2), so its flange F is removed from the frame edge molded body 3, and at the same time, a lens having the same shape as the ridge of the elastic plate periphery is attached to the inner periphery of the frame edge. A valley-like groove V is formed.

As described above, the present invention provides a female mold filled with a thermoplastic resin material, which is a molding material for the frame edge, and a stretcher made of a highly thermoplastic material having a melting point higher than that of the molding material and having appropriate hardness and elasticity. Since the concave grooves are formed by bending and removing the stretcher placement plate after forming the frame edge using the template, it is not necessary to form the frame edge as in the above-mentioned conventional method. Grooving by machining eliminates the troublesome work process and has the efficiency effect of making a grooved [lens frame edge] all at once.

However, if the stretcher template of the present invention is a metal template, the groove wires will be broken and damaged when the template is removed, making it impossible to obtain the desired effect of the present invention.

As described above, the present invention is a simple and extremely efficient manufacturing method for forming grooved frame edges of eyeglasses made of thermoplastic resin materials such as synthetic resins. It is an extremely useful invention with great practical benefits.

[Brief explanation of drawings]

The figure shows an embodiment of the method of the present invention, and FIG. 1 shows a state in which molten resin is filled between the empty space of a female mold in a molding machine and the stretcher mold plate inserted in the female mold. Fig. 2 is a transverse cross-sectional view showing the process of bending and removing the stretcher template from the eyeglass frame edge molded product removed from the same device, and Fig. 3 is a cross-sectional view of the main part showing the present method. It is a front view of the spectacle frame obtained by this. 1 is a female mold, 2 is a stretcher template, 3 is a frame edge molded body, F is a ridge,
H is the slot, R is the frame edge shaped cavity, P is the thermoplastic resin material, ■
is a groove for attaching the lens. Bud! 〆 Procedural amendment May 7, 1985 Commissioner of the Japan Patent Office Black 1) Yu Akira 1986 % Ken Application No. 051525 3, Relationship with the case of the person making the amendment Patent applicant 7, Contents of the amendment Akira MW MB Book 1, Title of the Invention Method 2 for Manufacturing Eyeglass Frame Edges Made of Thermoplastic Resin Material, Claims MB Book 1, Title of the Invention Method 2 for Manufacturing Eyeglass Frame Edges Made of Thermoplastic Resin Materials A protruding edge that fits the outer circumference of the lens is provided on the outer circumference of a stretch mold plate made of a thermoplastic resin with a high melting point and has hard elasticity that fits the inner circumference of the nucleus. In the tightened state, the device then has the female frame edge shape'! l! Thermoplastic (t) I having a lower melting point than the material of the elastic template is contained in the part.
A method for manufacturing an eyeglass frame rim made of a thermoplastic resin material, characterized in that the I material is filled in a hot molten state and then cooled and solidified to obtain a lens frame rim with a concave groove for attaching a lens that comes out of the frame. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of molding the rim of an eyeglass frame made of a so-called thermoplastic resin material such as a synthetic resin. [Prior Art] Conventionally, eyeglass frame edges made of molded articles of synthetic resin, celluloid, etc. are first made of a female bottle with a mold hole in the desired frame edge shape. The synthetic resin is filled in a molten state into the mold hole, and then it is cooled. When the resin is molded and solidified, the frame rim molded body is removed from the female mold, and next, the inside of the frame rim of the molded body is A two-step process is required, in which a valley-shaped concave groove that matches the shape of the outer peripheral edge of the lens to be mounted, for example, a chevron-shaped cross-sectional edge, is manually cut with a cutting tool or mechanically with a cutter device. This is what I did. However, it is not only inefficient to process the frame edge after molding the frame edge, but it is also inefficient in terms of manufacturing, and especially the grooved process requires skilled technique, which is why it is often This has the disadvantage that it tends to cause loss of product and therefore makes the product expensive. [Problems to be Solved] In order to solve the disadvantages of constriction, the present invention has been developed by forming a frame line having a concave groove on the inner periphery for engagement with the outer periphery of the lens at the same time as forming the core frame edge. This is intended to eliminate the secondary technical effort or man-hours of manually or mechanically cutting the frame edge separately after forming the frame edge as in the conventional method. [Means for solving the problem] In other words, the outer periphery is adapted to the shape of the lens periphery within the groove on the inner periphery of the female mold, in which a frame edge-shaped cavity that matches the desired shape of the lens frame is provided in a communicating manner on the inner side. A state in which the outer periphery of a stretcher template made of fluorinated ethylene resin (trade name: Teflon) or silicone rubber, etc., which has a moderate hard elasticity and has an appropriate hard elasticity, is interposed (
After the known injection molding apparatus is installed, nylon resin or polycarbonate resin is injected into the cavity of the female mold in a molten state, and non-combustible celluloid is injected in a molten state, and then cooled in a short period of time to fill the filled resin. After waiting for solidification, the frame edge molded body in the female pot is removed together with the stretcher template, and then the stretcher template is bent and removed from the molded body. [Operation and Effect] As described above, this method is an alternative to cutting a separate lens-like groove for engaging the lens into the inner periphery of the frame edge molded body without the groove for engaging the lens, which has been conventionally done. In addition, a stretcher template in the shape of a peripheral lens edge that is highly heat resistant and has great bending elasticity is inserted into the female mold and molded together with these. Since a frame edge with a concave groove for engaging the lens is obtained, there is no need for the conventional secondary and troublesome technical steps, and the great advantage is that an accurate concave groove can be obtained extremely easily. It is. [Example] As shown in the drawing, in the groove H on the inner periphery of the above-mentioned part of a known h-type IK, in which a hollow part R of an inner shape that matches the outer shape of a bicircular ring-shaped eyeglass frame is formed in communication with the outer periphery. A hard elastic elastic template 2 made of a fluorinated ethylene resin with a high melting point of 327°C and having a protrusion 44 F that matches the shape of the outer circumference of the lens is molded by known injection molding (;* <After the apparatus is installed, a nylon resin P with a low melting point of 185°C to 215°C is injected and filled in the space between these parts using a conventional method, and then the filled resin is cooled and solidified in a short period of time. After being removed from the female mold 1 together with the template 2, the stretcher template is bent (see Fig. 2) and removed from the molded body to form a lens edge engagement lens on the inner periphery as desired in the present invention. A frame edge 3 in which a groove v is formed is obtained. 4. A simple explanatory diagram of the drawing shows an embodiment of the method of the present invention. Figure 2 is a cross-sectional view of the main part showing a shape in which the molten resin was optically measured between the stretcher templates inserted in the female mold. Fig. 3 is a cross-sectional plan view showing the process of bending and ejecting the extension template, and Fig. 3 is a front view of the eyeglass frame obtained by this method. 1 is the female mold, 2 is the extension template, 3 is the frame edge, F is a ridge, H is a concave groove, R is a frame edge-shaped nitrogen part, P is a thermoplastic VvJ resin material, and V is a concave groove for attaching V lenses.

Claims (1)

[Claims] A high melting point material having appropriate hardness and elasticity whose rim approximately conforms to the inner peripheral shape of the cavity is placed in the inner circumferential groove of the cavity in a female mold which has an eyeglass frame-shaped cavity formed therein. The apparatus then inserts the material of the core template into the frame edge-shaped cavity of the female mold with a protrusion such as a chevron-shaped cross section provided on the outer periphery of the core template made of thermoplastic resin or silicone rubber. A frame edge molded body filled with a low melting point thermoplastic resin material in a hot molten state and then cooled and molded and solidified is removed from the female mold together with a core template. A method for producing an eyeglass frame rim made of a thermoplastic resin material, the method comprising bending the frame to obtain an eyeglass frame rim with a concave groove for attaching a detachable lens.