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The present invention relates to a cone and an edge manufacturing method in which a flexible
cone edge for joining a cone and a speaker frame is integrally molded using the same material
when manufacturing a speaker cone by vacuum molding using an olefin-based synthetic resin as
a material. It is. A conical horn plate (hereinafter referred to as a speaker cone or simply a cone)
constituting a loudspeaker. ) Is mainly made of paper, but it is difficult to maintain the uniformity
of thickness and density of paper, which may affect the fidelity of the reproduced sound, and
since the moisture resistance is weak, the change in sound quality due to moisture absorption
can be avoided It was not. In the audio equipment industry, we have been researching materials
to replace paper, but recently we have developed cones made of olefin-based synthetic resins
such as polypropylene and polyethylene that have excellent homogeneity, moisture resistance,
mass productivity, etc. It is taking a place to replace corn-made cones. Although it may be said
that the material of the speaker cone has been improved, what remains as a problem is a cone
edge, ie, a flexible member joining the cone and the speaker frame. Conventionally, the cone edge
is formed in a ring shape using a flexible material such as urethane, rubber, leather, cloth, etc.
separately from the cone, and the ringed inner edge is adhered to the outer edge of the cone and
the ringed outer edge is adhered to the speaker frame The cone and the speaker frame have been
elastically joined □, but is this method used to make the cone edge cone? It is a separate process
from molding, and the adhesion of cones and cone edges is also a subsequent process, which
takes time and effort, and has become an uneconomic factor in speaker production. It is an object
of the present invention to obviate the disadvantages of the prior art and to provide a simple and
inexpensive method of integrally producing corn and edges. Next, an embodiment of the present
invention will be described in the order of operation based on FIG. FIG. 1 is a cross-sectional view
of a speaker cone (1) tocone edge (2) formed according to the present invention. The thick part
shows a cone, and the thin part shows an edge. FIGS. 2 to 5 show the outline of the apparatus for
practicing the present invention and the operation thereof over time. In FIG. 2, a sheet (3) of an
olefin-based synthetic resin as a material is held by a circular or elliptical ring-shaped note clamp
(4) and heated by a heater (5). At this stage, the conical mold (6), the air-tightness (7) on which
the mold is placed and the annular edge forming mold (8) circumscribing the air-tight image are
adjusted according to the adjustment of the lifting air cylinder (9). Located below the seat clamp
(4), the pressure-(10) is located above the seat clamp according to the adjustment of the lifting
air cylinder (11).
Airtight-(7) is formed in a circular or oval cylinder having an outer diameter equal to the
diameter of the bottom of the mold (6), and the pressure fi (10) is approximately equal to the
diameter of the bottom of the mold (6) It is formed in a circular or oval cylindrical shape having
an inner diameter. FIG. 3 shows the forming process of the speaker cone (1), and when the sheet
(3) is softened by heating, the piston rod of the air cylinder (9) extends and the mold (6), airtight(7), The edge mold (8) and the air cylinder (13) for the edge mold are raised, and the mold (6)
pushes up the sheet (3) so that the bottom of the mold, that is, the top surface of the airtight i1i +
(7) is the sheet ( Stop at the same height as the clamp position in 3). At the same time, the
pressure-(10) descends and presses the sheet (3) against the peripheral edge of the mold (6) to
shut off the air for vacuum forming. The suction pump (14) is then operated to suck the sheet (3)
onto the surface of the mold (6) through the air tightness (7) and the air inlet (15) to form a
cone. FIG. 4 shows the first half of the forming process of the cone edge (2) following the cone
forming. When molding of the cone part is finished, the piston rod of the air cylinder (9) is
extended by a fixed distance to push up the mold (6), and it is clamped between the peripheral
part of the mold and the sheet clamp (4) The portion sheet is pulled to form a thin sheet (16). In
this case, since the sheet may be cut if the temperature drops, the auxiliary heater (12) heats the
sheet so as to maintain a temperature suitable for tension. Subsequently, as shown in FIG. 5, the
piston rod of the air cylinder (13) is extended to raise the edge molding die (8), and the upper
surface of the die is the same height as the peripheral portion of the die (6). Stop at the lined
position. At the same time, the suction pump (17) is operated, and the thin-walled sheet (16) is
adsorbed on the upper surface of the mold (8) through the suction hole (18) to form the edge (2).
The edge portion must be soft and flexible and at the same time be capable of supporting the
cone, but its thickness is suitably from-to-of the cone portion (1). An appropriate value can be
obtained by adjusting the degree of increase in air-tightness (7). Airtight-(7) and sheet clamps (4)
are formed in a circular or oval shape according to the shape of the mold (6), so thin wall tension
between airtight 1 to sheet clamps is performed evenly, the wall thickness It does not cause
unevenness or wrinkles. After molding is complete, raise the suppression fi (10), stop heating,
cure the resin, release the mold and cut it down, etc., and obtain the product through ordinary
Since the process in the edge suction chamber is carried out within 1 second or so from the cone
suction, the present invention is composed of two operations. The high speed of the process and
the production of a multi-cavity mold are possible. It can be said that it is an integrated
manufacturing method of high cone and edge.
Brief description of the drawings
1 is a front sectional view of a product molded according to the present invention, FIG. 2 is a
heating step of a resin sheet, FIG. 3 is a molding step of a cone portion, FIG. 4 is a first half of an
edge portion molding step, Is a figure which shows the second half of an edge part formation
2 is a speaker cone portion, 2 is a cone edge portion, 3 is a resin sheet, 4 is a sheet clamp, 5 is a
heater, 6 is a conical mold, 7 is an airtight-, 8 is an edge forming mold, and 9 is a lifting air
cylinder , 10: press-111: lift air cylinder, 12: auxiliary heater, 13: edge mold air cylinder, 14:
suction pump, 15: suction port, 16: thin sheet, 17: suction pump, 18: suction port . Patent
application agent Takashi Kanade-\ lIiJ
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