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JPH04281698

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DESCRIPTION JPH04281698
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm cutting apparatus used for manufacturing a diaphragm used in a microphone.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 7, in this type of diaphragm
cutting apparatus, a ring 2 bonded to a diaphragm 1 is dropped into a die hole 4 provided in a
die 3 and positioned. The punch 5 is moved in the direction of the arrow to cut the diaphragm 1
between the punch cutting edge 6 and the die cutting edge 7.
[0003]
However, in the above-described conventional diaphragm cutting apparatus, when the diaphragm
1 should not protrude outside the side surface of the ring 2, the outer diameter dimensional error
of the ring 2 or the dimensional error of the ring 2 Since there is a positioning error of the ring 2
and the inner diameter of the die hole 4 needs to be larger than the outer diameter of the ring 2,
the shape after cutting is outside the side of the ring 2 as shown in FIG. There was a problem that
a part overflowed.
Also, the thickness of the diaphragm 1 is very thin (0.004 mm), the clearance between the punch
edge 6 and the die edge 7 is almost equal to zero, making it very difficult and expensive to make
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punches and dies. was there.
[0004]
The present invention solves such conventional problems, and provides an excellent diaphragm
cutting device in which the diaphragm does not protrude outside the side of the ring by the
punch and the die which can be easily manufactured. The purpose is to
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
adheres to a die having a die hole provided with a bowl-shaped inclined surface on the inner
surface and a metal ring on the upper surface. A pressing plate for pressing and fixing a portion
of the sheet-shaped diaphragm outside the ring of the ring on the upper surface of the die, and
pressing the ring downward through the diaphragm through the diaphragm of the ring A
diaphragm for pressing the inclined surface of the die hole and means for rotating the punch in a
state where the ring is pressed against the inclined surface of the die hole; It is possible to cut the
diaphragm.
[0006]
Therefore, according to the present invention, the diaphragm positioned on the outside of the
ring is fixed by the holding plate, and in this state, the ring is pushed by the punch into the inside
of the die hole, and the edge portion of the ring is inclined on the inclined surface By pressing
and rotating the punch, the ring is also rotated together, and the diaphragm sandwiched between
the inclined surface and the edge of the ring is pushed off so that the diaphragm does not
protrude outside the side of the ring Have the effect of being able to
[0007]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 1 and 2 show the construction of an
embodiment of the present invention.
In FIGS. 1 and 2, reference numeral 11 denotes a linear slider supported so as to be vertically
movable by a guide shaft 13 fixed to the apparatus main body 12, and is driven by compressed
air.
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A plate 14 is fixed to the linear slider 11. An angle 15 and a block 16 are attached.
A motor 17 is attached to the angle 15, and a gear 18 is attached to the output shaft. The
reference numeral 19 denotes a shaft rotatably supported by the block 16. A gear 20 engaged
with the gear 18 is attached to one end, and a pin 21 passes through the other end. In FIG. 1,
reference numeral 22 denotes a punch having an elongated hole 23 through which the pin 21
passes, and is biased downward by a spring 24 and held at a position where one end of the
elongated hole 23 abuts on the pin 21. A pressing plate 25 is vertically movably supported by a
supporting device (not shown), and is biased downward by a spring 26. Reference numeral 27
denotes a diaphragm to which a metallic ring 28 is adhered, and a diaphragm portion located
inside the ring 28 is given a constant tension. Reference numeral 29 denotes a die having a die
edge 30 and a die hole 32 provided with an inclined surface 31 and is attached to the apparatus
body 12. The diameter of the die cutting edge 30 is about 0.5 mm larger than the outer diameter
of the ring 28.
[0008]
The operation of the above embodiment will now be described. In the above embodiment, when
the linear slider 11 is driven in the direction of the arrow, the punch 22 and the holding plate 25
are lowered and the holding plate 25 is moved to the upper surface of the die 29 by the elastic
force of the spring 26 as shown in FIG. Press and fix 27. When the punch 22 further descends, as
shown in FIG. 4, the punch 22 pushes the ring 28 into the inside of the die hole 32, whereby the
diaphragm 27 on the outside of the ring 28 is extended and cut by the die blade 30 as shown in
FIG. It becomes the state of 5. Furthermore, when the linear slider 11 is lowered, the punch 22
presses the ring 28 by the elastic force of the spring 24. At this time, when the motor 17 is
driven, the shaft 19 is rotated through the gear wheels 18 and 20, and the pin 21 abuts on the
side surface of the elongated hole 23 to rotate the punch 22. Since the tip of the punch 22 is
non-slip, the ring 28 rotates with the punch 22. Thereby, the diaphragm 27 sandwiched between
the inclined surface 31 and the edge portion of the ring 28 is pushed off.
[0009]
As described above, according to the above embodiment, by pressing the ring 28 against the
inclined surface 31 and rotating it, the diaphragm 27 sandwiched between the inclined surface
31 and the edge portion of the ring 28 is pushed and cut off. As shown in FIG. 6, it has the
advantage that the diaphragm 27 does not protrude outside the side of the ring 28. In addition,
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since the diaphragm 27 is not cut between the die edge 30 and the outer diameter of the punch
22, the punch 22 and the die 29 do not require machining accuracy as compared with the
conventional one, and can be easily manufactured at low cost. Have the effect of
[0010]
Furthermore, according to the above embodiment, the ring 28 is automatically positioned at the
center position of the die hole 32 by pressing the ring 28 against the inclined surface 31 and
rotating it, so the ring 28 can be cut before cutting. It is not necessary to accurately position, and
has the effect of enabling cutting even if the positioning error is large.
[0011]
As is apparent from the above embodiments, the present invention pushes the ring against the
inclined surface inside the die hole to push the diaphragm away, so the diaphragm is provided
outside the side of the ring. It has the advantage of not sticking out.
Further, since the diaphragm 27 is not cut between the die tip and the outer diameter of the
punch, the punch and the die do not require machining accuracy as compared with the
conventional one, and can be easily manufactured at low cost. Have an effect.
[0012]
Furthermore, according to the present invention, the ring is automatically positioned at the
center position of the die hole by pressing the ring against the inclined surface and rotating it, so
it is not necessary to accurately position the ring before cutting. There is an effect that cutting is
possible even if the positioning error is large.
[0013]
Brief description of the drawings
[0014]
1 is an enlarged side view of an essential part of a diaphragm cutting apparatus according to an
embodiment of the present invention.
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[0015]
2 is an overall side view of the same embodiment.
[0016]
3 is a cross-sectional view showing the operating state of the same embodiment.
[0017]
4 is a cross-sectional view showing the operating state of the same embodiment.
[0018]
5 is a cross-sectional view showing the operating state of the same embodiment.
[0019]
6 is a cross-sectional view showing the diaphragm after cutting according to the same
embodiment.
[0020]
7 is a cross-sectional view of the main part of the conventional diaphragm cutting device.
[0021]
8 is a cross-sectional view showing the diaphragm after cutting by the conventional diaphragm
cutting device.
[0022]
Explanation of sign
[0023]
Reference numeral 22 punch 25 presser plate 27 diaphragm 28 ring 29 die 30 die cutting edge
31 inclined surface 32 die hole
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