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Patent Office Secretary Hideo Saito Name! 'Fvr <nhH5> 3, Patent applicant-address Tokyo Vt
ward v 6-chome 83rd No. 3 [Phase] Japan Patent Office ? Japanese Patent Application
Publication 5Q-120615 15 0 Japanese Patent Application 50. (1975) 9.22 ? Japanese Patent
Application No. l?- / 2/2 in the office serial number (, ffJ title of the invention, title 2, a fixed pin
(18) for temporarily attaching four corners of a square sheet material A pair of parallel chains
(16) (17) implanted at intervals and driven intermittently, and a heating furnace (19) provided to
surround the chain on the forward side of the chain, and adjacent thereto And a pressing device
(20) having a mold for pressing and cooling the processed sheet material 9 is provided, the
heating furnace is maintained at or above the processing heating temperature of the sheet
product, and the pressing device is a pressed sheet An apparatus for forming a speaker edge
member, characterized in that only the heat-shrinkable portion of is pressed.
Loudspeaker edge member molding method and apparatus 1 of the present invention, a foam
sheet 'l having a weight ratio of about 7 to 70 g of collagen fine fibers of 0.2 to 2.0 m / m mixed
with ethylene borate vinyl copolymer and predetermined thickness The sheet is cut to the size
and size to make a square sheet I original plate, and with the four corners of this sheet original
plate fixed, heat shrinkage occurs uniformly in the central portion of the sheet plate at a
temperature above the processing heating temperature of the product. Immediately after this, it
is press-formed with a predetermined cooling mold, and the 'portion of the press-formed plate is
punched out to form an edge.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
forming a speaker edge member and its apparatus. It is well known that the speaker edge is a
large factor that influences the acoustic characteristics of the entire speaker. The sound
equipment such as Spearker is usually one in the range of -20 to 20 ░ C, so its performance
should also be maintained in the best condition in the above temperature range and the edge is
also at low temperature Needless to say, a round thing whose acousticity changes suddenly is
undesirable. The present inventors uniformly mix 0.2 to 2.0 m / m of collagen fibrils into a
thermoplastic resin foam, so that the low range characteristics, particularly fo, is low even at low
temperatures, and the efficiency is also excellent. Succeeded in developing a sponge sheet
material that does not decrease much (4? No. 48-141394), EndPage: 1 ? 1 ? This material itself
has satisfactory acoustic performance but has the property of shrinking when heated to
temperatures above about 50 ░ C. The fact that this contraction reduces the acoustic
performance of the above-mentioned material is not a practical application of the ? edge, which
is clear even in various comparison tests, that is, industrial production. Since it is necessary to
attach the entire circumference of the speaker cone to the frame to ensure the smoothness of its
back and forth movement, it must not be given an uneven external force on the cone. You must
not be overwhelmed. Thus, the etch (1) is generally annular and its outer edge (2) is fixed
between the frame outer peripheral edge (6) of the speaker and the annular arrowhead (4) and
the inner edge (5) is cone. It is glued to the outer edge (6). Special binders are used to bond the
edges. Moreover, since the binder needs to be heat-treated and the temperature is usually 70 to
80 ░ C., the edge material applied to the present invention naturally shrinks in an appropriate
manner as described in JP-A 5O-120615 (2i). Become. In addition, it is common practice to form
concentric or longitudinal corrugations (.7) on the edge in order to smooth out the longitudinal
vibration range and prevent distortion with large amplitude, which is a result of contraction as a
result of contraction. Or if it has disappeared, it is said to be a well-rounded material-it is suitable
for practical use. ????????? The present invention is intended to provide an edge that
does not shrink even in severe processing by using the disadvantages inherent in such novel
edge materials, and in accordance with this, it is rather rather appropriate softness and density.
Since the number lf of the binder and the high heating temperature can be also used, the
selection range of the binder to be used is expanded 1-and it is possible to manufacture a wide
variety of loudspeakers in an economical and economical manner.
0.2 to 2.0. It is a sponge sheet mixed and heat-foamed in a 7 to 70% weight range of collagen
fine fiber gold of m / m. The present invention will be described below with reference to the
drawings. The sheet body is divided into a thickness of 1 m / m and further cut into a square of
50 m on each side to obtain an original plate (11). The outline of the apparatus for forming the
original plate is as shown in FIG. 2 and below, and the transfer chains (16) and (17) are stretched
over the sprockets (121 (13), (14) and (15), respectively. A bottle (18) for temporarily attaching
the original plate is implanted in the chain. Of course, the spacing of the chain and the spacing of
each bin are adapted to the size of the original plate. (19) is a heating furnace and (20) is a press.
The original plate (11) is inserted at its four corners into a bottle (18) and temporarily attached
onto a chain. The original plate (11) is intermittently transferred by a predetermined length in
the arrow direction and enters a heating furnace. The furnace is maintained at 100-11Q'C, and
the raw #i shrinks in all directions in the furnace to form a wound form as a whole. The yarn-
wound base plate coming out of the heating furnace is pressed (at the same time as it is pressed
(at the same time, it is cooled to 20 ░ C.) in order to form a 3- to 1-shaped corrugation of a
predetermined shape, ie, an edge, in a pressing device (2o). The press blank (21) coming out of
the press device is peeled off and stacked from the pin (18) of the chain by the automatic
removal lever (22). The apparatus of the present invention performs the work on the crucible
continuously to form a press blank. When the press plate is pulled out of the pin, the corner
angle pulled by the pin shrinks and becomes slightly corrugated, but this part is used as an edge
and is a rough part, and the used part is pressed There is no impact on the quality of the product
because it is only a part. Of course, the mold is produced according to the corrugation of the
edge, but if it is produced as shown in FIG. 4, there is an advantage that two types of edges
having different diameters can be press-formed in one behavior. The press base plate thus pressformed is punched into a predetermined shape by a punching device to form an annular edge
member. This annular edge member is bonded to the outer peripheral portion of the cone paper
and the frame as shown in FIG. 1 and heated to EndPage: 2 about 70 to 80 ░ C., but the edge
member is already heated to 110 ? ? ? CK 71 O Since the film is sufficiently shrunk, it does
not undergo total heat shrinkage even when subjected to a heating temperature of 70 to 80 ░ C.
and is adhered in a state of being glued at room temperature. Temporarily hold the four corners
of the sheet for the edge as small as possible, ie, an area close to the point S, by means of a pin or
other clamping device in order to shrink the edge material which is contracted by The collection
part, ie, the central part, of the sheet original plate is freely shrunk to a temperature (not the
temperature necessary for press forming) at a temperature equal to or higher than the
processing temperature for marijuana processing to obtain a distortion-free and homogeneous
sheet material, and the part is pressed into a desired shape.?Molded into a punched annular
edge member, this shrinkage increases the density, provides appropriate flexibility, and improves
the acoustic characteristics, resulting in a favorable state and at the same time improving the
workability 1 workability. It is nine of them.
The characteristics of the edge of the present invention are: V, A, and knee 1 which can be
changed by the blending ratio of the collagen fiber with the collagen fiber and the like. According
to the general rule of Japanese Patent Application Laid-Open No. 5O-120615 (3), the best
characteristics are obtained in this final state, so that the manufacturing conditions of the sheet
material are determined in consideration of the entire shrinkage factor. It should. In particular,
since the expansion ratio is absorbed by the foaming gas-ball collagen fiber and the amount of
shrinkage usually decreases by the amount of collagen fiber, the preferable acoustic
characteristics are individually determined empirically and experimentally. It is not necessary to
free the force ball lower side which may be necessary only for the black flat plate mounting type
of the manufacturing apparatus of the press original plate in the embodiment and the
embodiment, but it is not preferable to support four points as in the practical example. The
scheme is good.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the main part of a
speaker to which the edge of the present invention is applied, FIG. 2 is a plan view of a press
forming apparatus, FIG. It is section 1 of the vermilion of the type. (1) ...... edge, (4) ...... annular
arrow paper, (11) ...... ii ', (21) ...... Press original plate, (16 (17)
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EndPage: 36 Inventors other than the above address in Tokyo ? Fi Fib 4 chome 5th grade 6 ? Ц
V ?? address ? 6 city number 4 337 number 1 ? ? Name Iwasaki man Z other applicants,
address Tokyo r ward; i3 i ? ? l-64, c. 54, No. 6, name ik Ц ? ? 50-120615 (4) End Page: ?
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