JPH0112482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a method for manufacturing a snap button.

(b) Prior Art As is well known, a snap button consists of a pair of convex and concave snaps, and generally one type, for example, a concave snap element (SE), has a non-active end face made of synthetic resin. It consists of a button body attached. Generally, in order to attach the concave shape of the snap to the button body, a metal eyelet member that is bonded to the button body is used.
Conventionally, in order to attach this metal eyelet member to a button body made of synthetic resin, the synthetic resin, which is the material of the button body, was simultaneously cast and integrally molded. On the other hand, recently, this type of synthetic resin button may require piece-dying treatment. However, as mentioned above, buttons whose eyelets are integrally formed by the pour molding process are economically disadvantageous because the piece-dyed dye penetrates into the eyelets, and the workability in the crimping process is also disadvantageous. It has the disadvantage of causing a decrease in

(c) Purpose of the Invention This invention provides a method for manufacturing a snap button as described above, in which a button body and an eyelet member are separately molded, and the eyelet member is heat-fused and fixed to the button body. The object of the present invention is to provide a novel snap button manufacturing method that eliminates the conventional drawbacks.

(d) Structure of the Invention In order to achieve the above-mentioned object, the present invention specifically includes a button body made of synthetic resin, and a mechanism for caulking a female snap element to the button body. A method for manufacturing a snap button comprising a metal eyelet member, comprising a metal eyelet member formed by integrally molding an embedded base for the button body and a caulking end for the female snap element, and a button decorative surface on the surface. , separately preparing a recess on the back surface for receiving the embedded base of the eyelet member in the axial direction, and a button body made of thermoplastic resin having a circumferential ridge on the outer peripheral edge of the recess; The embedded base of the eyelet member is fitted into the recess of the button body, and the circumferential ridge on the button body is plastically deformed by heating and pressurizing to partially cover the embedded base of the eyelet member. In this manner, a method for manufacturing a snap button is constituted, which comprises a step of heat-fusion fixing the eyelet member to the button body.

(e) Description of Examples Hereinafter, a method for manufacturing a snap button according to the present invention will be described in detail based on specific examples shown in the drawings.

In this invention, the metal eyelet member 1 and the button body 2 made of thermoplastic resin are each formed and prepared separately. The metal eyelet member 1 is usually obtained by pressing a brass material having a thickness of about 0.2 to 0.3 mm. The eyelet member 1
integrally has an embedded base 3 with a preset diameter R and a caulked end 4 with an outer diameter r. The embedded base 3 of the eyelet member 1 may be flat, or may be reinforced and formed into an uneven rib shape. On the other hand, button body 2
is molded from thermoplastic resin, such as nylon (preferably 6-6 nylon) or ABS resin. The front side 2a of the button body 2 is
The design is appropriately processed as a button decoration surface. On the other hand, a recess 5 for receiving the embedded base 3 of the eyelet member 1 is provided on the back side 2b of the button body 2. Furthermore, the back side 2b of the button body 2
A circumferential ridge 6 is provided along the outer periphery of the recess 5. As shown in FIG. 2, the circumferential protuberance 6 preferably extends outward from the surface 3a of the embedded base 3 when the embedded base 3 of the eyelet member 1 is fitted into the recess 5. For example, it is formed into a ladder-shaped cross section that protrudes from the top. More preferably, a circumferential groove 7 whose level is slightly lowered is provided along the outer circumferential surface of the circumferential ridge 6. By providing the circumferential groove 7, when the circumferential protuberance is heat-fused and caulked, the bulge on the outer periphery of the circumferential protrusion can be compensated for and the finished surface created by the heat-fused caulking can be made flat. The eyelet member 1 and the button body 2 can be assembled by simply setting the diameter of the embedded base 3 in the eyelet member 1 and the diameter of the recess 5 in the button body 2 in advance, and the other parts can be adjusted according to the requirements. It can be designed as desired. In addition, button body 2
can be individually piece-dyed if necessary. On the other hand, the button body 2 and eyelet member 1 prepared in this manner are heat-fused and fixed in the next step. That is, the embedded base 3 of the eyelet member 1 is inserted into the recess 5 of the button main body 2, and the circumferential ridge 6 provided on the outer peripheral edge of the recess 5 of the button main body 2 is stamped with a photo stamp or ultrasonic wave. The undercut portion 8 is formed by applying heat and pressure using a welder or a high-frequency welder, and the undercut portion 8 is heat-fused and fixed.

(f) Effects of the invention As detailed above, according to the method for manufacturing a snap button according to the present invention, the metal eyelet member and the synthetic resin button body are prepared separately, Not only can the button body be treated with any design, but also the button body can be piece-dyed economically according to demand, so buttons can be provided in a wide variety of shapes. Furthermore, the present invention is suitable for mass production in terms of workability and can be provided at low cost, which is also economically advantageous. Furthermore, according to the present invention, the eyelet member is heat-fused and bonded to the button body, which has excellent strength and is extremely effective in providing high quality snap buttons. It can be said to be a thing.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a metal eyelet member applied to this invention, FIG. 2 is a half cutaway perspective view of a button body applied to this invention, and FIG. 3 is a perspective view of a metal eyelet member applied to this invention. FIG. 4, which is a partially cutaway perspective view of the button body being heat-fused and fixed, is a cross-sectional view showing how the concave snap element is crimped to the crimped end of the eyelet member. 1... Eyelet member, 2... Button body, 3...
Embedded base, 4... Caulked end, 5... Recess, 6...
... Peripheral protuberance, 8... Undercut portion.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a snap button comprising a button body made of synthetic resin and a metal eyelet member for caulking a female snap element to the button body, comprising: an embedded base for the button body; and a caulking end portion for the female-type snap element are integrally formed, a metal eyelet member having a button decoration surface on the front surface, a recess on the back surface for receiving the embedded base of the eyelet member in the axial direction, and the aforementioned metal eyelet member. a step of separately preparing a button body made of thermoplastic resin having a circumferential ridge on the outer peripheral edge of the recess; fitting the embedded base of the eyelet member into the recess of the button body; plastically deforming the circumferential protuberance on the button body by heating and pressurizing the button body so as to partially cover the embedded base of the eyelet member, and fixing the eyelet member to the button body by heat melting; A method for manufacturing a snap button characterized by: