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Ming # fI Ministry 1, the name of the invention
Method of manufacturing an edge for a speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing an edge for a speaker diaphragm. The edge for a speaker diaphragm needs to be
formed of a material having a large internal loss, in particular, in order to prevent resonance.
Materials having a large internal loss include, for example, plastic or plastic foam, and of these,
there was the one shown in FIG. 1 for forming an edge using the plastic foam. That is, for
example, polyurethane 7 foam as plastic 7 ohms, a fabric material of this polyurethane based
foam, an annular edge construction piece C having an inner diameter and an outer diameter of a
desired edge, leaving a yield BI + 82. After cutting, the edge-constituting pieces C are heat-treated
and pressure-treated to form an edge. However, with this method, only the area about h of the
entire area of the fabric material can take the edge configuration piece C for EndPage: 1 molding
the edge, and the yield BI + 82 is wasted . The present invention has been made in view of the
above-described points, and the object of the present invention is to minimize yield loss from a
fabric material, and to make it possible to use a large number of edges from one edgeconstituting base material. It is an object of the present invention to provide a method of
manufacturing an edge for a speaker diaphragm in which an edge can be formed by a simple
process and apparatus because materials can be effectively used since component pieces can be
formed without waste. Hereinafter, the present invention will be described together with the
apparatus used in accordance with FIG. In FIG. 6, 1 is an upper mold and 2 is a lower mold, and
the upper mold 1 and the lower mold 2 have desired shapes to be molded. Then, in order to form
an edge using the above-described apparatus, first, as a first step, the cylindrical fabric material 3
formed of thermoplastic plastic foam is spirally wound so as to peel off the skin, and the width of
the edge is substantially the same as the width Slice 4 (Figures 2 and 3). Then, in the second step,
the material material 3 sliced in the spiral shape is sliced at a thickness of about half or less of
the thickness of the edge in the direction orthogonal to the axial length direction, and the strip 6
is formed. As a third step, the above-mentioned strip 6 is ring-shaped into two or more pieces
(FIG. 5) and housed in the lower mold 2, and then the upper mold 1 and the lower mold 2 are
butted, Heat and press (FIG. 6) to form an edge. Hereinafter, the present invention will be
specifically described according to one embodiment. In the first step, polyurethane-form (for
example, urethane foam) 'f: A columnar material 3 having parallel upper and lower end faces and
having a columnar shape is prepared, and the material 3 is peeled from the periphery toward the
center Slice 4 in a spiral shape to the width of the edge (for example, 10 to 60 m).
At this time, a part of the outer periphery is the remaining yield. Next, as the second step, the
dough 3 sliced in a spiral shape 4 is sliced 5 in a thickness direction of about half or less of the
thickness of the edge in the direction of 9 in the axial direction and + ', for example 1 to 10
inches). , Strip 6 is formed. Since the strip 6 is required to be sliced in a spiral shape, it tends to
curl naturally. Therefore, when the strip 6 is placed on a flat surface, the lower strip of the press
may be used as a third process which is convenient for naturally molding a ring-like and a nari
endless edge. After being contained in 2, the pressure is applied by the upper mold 1 and heat
treatment is performed. In this case, the temperature varies depending on the composition of the
heating / heating type, the urethane type / form used, the thickness, and the filler of the upper
mold 1 and the lower mold 2; Is about 3 K 97 cm "; about 20 seconds. Then, the strip 6 becomes
an endless edge due to the self-bonding by the above-mentioned molding. Therefore, even if the
strip 6 is stacked several times, the self-fluxing layer forms an inconspicuous integrated edge of
the seam. In addition, it is necessary to change the hardness of the edge depending on the 4s
[used], but the hardness can be easily changed by changing the number of overlapping strips 6.
できる。 Since the remaining strip 6 has a large degree of freedom in curling, the same strip 6
can also form an edge of a machine having a different diameter. EndPage: 2 or more 2) As in the
present invention, a cylindrical dough material is spirally sliced and sliced in the direction
orthogonal to the axial direction to obtain a strip, and the strip is heated by pressing, As pressure
is applied to form an endless edge, a large number of edges can be formed from one fabric
material, and at the same time, waste of material is eliminated, and the material can be used
effectively. In addition, since it is possible to easily form an edge with different hardness and a
large edge metal with one strip, cost can be reduced.
4. Brief description of the drawings m1 is a front view of a state in which an edge component is
cut out from a dough phase in the conventional edge manufacturing method, and FIGS. 2 to 6
show the process of the present invention 96, 2 is a perspective view of the base material, FIG. 3
is a perspective view showing a first step of fluoride, FIG. 4 is a perspective view showing a
second step, and FIG. 5 is a perspective view of a strip obtained by the above, FIG. The figure is a
cross-sectional view showing the third step. 1 .... - - the upper mold 2 ...... lower mold 3 ······ fabric
material 6 .... - - strip cantilever Patent Applicant Pioneer body, Ltd. 11 Figure Δ 3 14
−43EndPage: 3
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