JPH0110096Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a mold for molding a metal lens frame for eyeglasses.

Prior Art FIG. 1 shows a lens frame 1 and a lens L before and after processing.

Normally, prescription lenses or sunglass lenses L
is a spherical disk before processing. On the other hand, the lens frame 1 has almost a non-circular shape, except for the shape that it fits into. For this reason, the lens L is a non-circular lens frame 1.
When the lens L is cut off along the inner contour of the lens L, the outer shape of the lens L after processing, that is, the outline of the cut end, is not equidistant from the center of the lens L, and therefore does not lie within one plane. Therefore, the lens frame 1 is bent into a ring shape in one plane, and then bent using a press machine so as to follow the contour of the lens L after the bending process, and the lens frame 1 is bent into a ring shape in one plane, and then bent with a press machine so as to follow the contour of the lens L after the bending process. It can be combined with the lens L of This bending process is called warping process among those skilled in the art.

Now, as shown in FIGS. 1 and 2, the lens frame 1 is provided with a hinge 2 for a temple connection on one side.

Conventionally, hinge 2 is not subject to warping and remains in a free state during warping, so when viewed from a plane, the tangential direction of the lens spherical surface after warping is It comes off. As a result, when the temple for glasses is attached to the hinge, the temple opens more than necessary. This makes the glasses look unsightly, and the glasses tend to become unstable during use.

Purpose of the Invention The purpose of the present invention is to regulate the posture of the hinge during warping of a lens frame, thereby shaping the hinge in a desired orientation after warping.

Therefore, in the present invention, of a pair of upper and lower molds, a receiving pin is provided on the molding surface of the lower mold facing the hinge, and the lens frame is inserted between the upper mold and the lower mold. When giving a warp to the lens, the hinge is shaped with a receiving pin in the tangential direction of the spherical surface of the lens.

Structure of the Invention The present invention will be specifically explained below based on an embodiment shown in FIGS. 4 to 6.

The lens frame molding mold 3 of the present invention is composed of a pair of lower mold 4 and upper mold 5, both of which have annular molding on corresponding surfaces that has the same outline as the lens frame 1 and curves in accordance with the warp. It has surfaces 6 and 7, respectively. Further, the lower mold 4 has a guide body 8 along the inside of the molding surface 6 and having the same shape as the inside contour of the lens frame 1.
Further, a receiving pin 9 is held at a position corresponding to the hinge 2 of the lens frame 1.

Both molding surfaces 6 and 7 are joined to each other, but the degree of warpage (curvature) at that part is set to be slightly larger than the curvature of the lens frame 1 to be molded to take into account spring back. be. Further, the guide body 8 includes guide holes 10 of the lower die 4 and the upper die 5,
11 in a vertically slidable manner, but is supported by a support rod 12 during machining and is located inside the guide hole 10 at a position slightly higher than the molding surface 6.

The receiving pin 9 has a receiving surface 13 at its tip that is inclined along the molding direction of the hinge 2, and its position can be adjusted in the height direction with respect to the mounting hole 14 on the outside of the recess 18 of the molding surface 6. It can be inserted freely. The receiving pin 9 is fixed by tightening a push screw 16 screwed into a screw hole 15 in the side surface of the lower mold 4. The tip of this push screw 16 is connected to the contact surface 17 of the receiving pin 9.
is in contact with.

Note that the molding surface 6 on the upper surface of the lower mold 4 corresponds to the lens frame 1 on the right side, but the molding surface 6 on the lower surface is
The lower mold 4 is turned upside down and combined with an upper mold (not shown) to be used for processing the left lens frame. Of course, the inclined receiving surface 13 on the lower surface of the receiving pin 9 is used when processing the left lens frame.

Effect of the invention Next, the effect of the invention will be explained as well as the warping process using the lens frame molding die 3.

The lower mold 4 is fixed on the table of the small press, and the upper mold 5 is attached to its ram. Then, a flat lens frame 1a as a workpiece
is fitted into the guide body 8 and placed in a fixed position. At this time, the hinge 2 has entered the recess 18. Here, the height of the receiving surface 13 is adjusted in advance to an appropriate height that allows it to come into contact with the hinge 2 along the curved surface of the warping process.

When the upper mold 5 descends in this state, the planar lens frame 1a is compressed between the molding surface 6 of the lower mold 4 and the molding surface 7 of the upper mold 5, and the flat lens frame 1a is pressed against the molding surfaces 6 and 7. curved.

At this time, the hinge 2 of the lens frame 1a is the receiving pin 9.
Since it is pressed against the upper receiving surface 13 of the lens frame 1a, the lens frame 1a is shaped along the same arc as the curve of the upper and lower lenses L, that is, in the tangential direction.

Thereafter, the upper mold 5 rises, and the guide body 8 sinks into the guide hole 10 as the support rod 12 descends. As a result, the processed lens frame 1a is released from the constraints and can be easily taken out. Of course, after processing, the warpage of the lens frame 1a is
The lens frame 1 returns due to the spring back inherent to the metal material, and after returning, the lens frame 1 has a shape that conforms to the contour of the lens to be fitted.

Note that even if the orientation of the hinge 2 is incorrect and needs to be corrected after the above processing, this mold 3 can be used again for correction by adjusting the height of the receiving pin 9.

The above-mentioned receiving surface 13 has an inclined receiving surface 13, but as long as this receiving surface 13 is at an appropriate height, even if it is not inclined, it will come into contact with the hinge 2 during warping. , the direction can be regulated.

Effects of the invention According to the invention, since the receiving pin is provided at a position corresponding to the hinge of the lens frame, the hinge comes into contact with the receiving pin during warping and is bent in the direction of warping. The orientation can be easily processed when warping the lens frame.

In addition, as a preferred embodiment, in an example in which the receiving pin has an inclined receiving surface and is provided in a position adjustable state on the lower mold, the direction of the hinge can be set accurately and arbitrarily, and the spring of the lens frame It becomes easier to deal with changes in back, and can also be used to correct orientation. Furthermore, in the embodiment in which the guide body is vertically movable, positioning of the lens frame before processing is easy, and furthermore, removal after warping is also facilitated.

[Brief explanation of drawings]

Fig. 1 is an explanatory view of the relative position of the lens frame and lens, showing the side and front views, Figs. 2 and 3 are plan views of the lens frame, and Fig. 4 is a front view of the mold for molding the lens frame of the present invention. Fig. 5 is a plan view of the lower mold, Fig. 6 is a plan view of the lower mold.
The figure is a vertical sectional view of the lower mold. 1... Lens frame, 2... Hinge, 3... Lens frame molding mold, 4... Lower mold, 5... Upper mold, 6, 7...
...Molding surface, 8...Guide, 9...Receiving pin, 1
0, 11... Guide hole, 13... Receiving surface.

Claims (1)

[Claims for Utility Model Registration] (1) A lower mold having an annular molding surface corresponding to the curvature of the lens frame, an upper mold having an annular molding surface corresponding to the curvature of the lens frame, and the lower mold. A mold for molding lens frames of eyeglasses, comprising a guide body located inside the molding surface, and a receiving pin provided near the molding surface of the lower mold and capable of abutting on the hinge of the lens frame. . (2) At the tip of the receiving pin, a receiving surface is formed that is inclined along the direction of the hinge, and this receiving pin is inserted into the mounting hole of the lower mold so that its position can be adjusted freely, and the pusher pin is screwed into the lower mold. A mold for molding a lens frame of eyeglasses according to claim 1, which is fixed with a screw. (3) A mold for forming a lens frame of eyeglasses according to claim 1 or 2 of the utility model registration claim, characterized in that the guide body is slidably supported in the guide hole of the lower mold.