Field of the Invention
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The present invention relates to a traverse apparatus having rotating wings
for rotating two yarn guide rotating wings in opposite directions. More
particularly, the present invention relates to a traverse apparatus having
rotating wings employed when a yarn is wound as a cone-shaped package.
Background of the Invention
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A traverse apparatus having rotating wings rotates two yarn guide rotating
wings disposed one over the other in opposite directions at a constant speed,
and transfers a yarn wound around a package to the yarn guide rotating wings
alternately, and guides the yarn to a yarn guide plate disposed along the locus
of movement of the yarn guide rotating wings, thereby reciprocally traversing
the yarn wound around the package in the axial direction.
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An improved traverse apparatus of this type is disclosed in Japanese Patent
Publication No. 2560918, which describes a traverse apparatus having rotating
wings. In this traverse apparatus having rotating wings, the number of two
yarn guide rotating wings disposed together is differentiated, and their
rotation speeds is differentiated by means of the inverse of the number ratio of
the two different rotating wing numbers, thereby differentiating the traverse
speeds of the forward and backward paths, i .e., the wind number of the forward
and backward paths.
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In such a traverse apparatus having rotating wings, although the upper and
lower yarn guide rotating wings for substantially traversing yarn rotate in
opposite directions, since their rotating wings rotate at a constant speed, the
traverse speed is constant at the right and left ends of the package.
Therefore, even if an attempt is made to form a cone-shaped package using the
above traverse apparatus having rotating wings, it is difficult to obtain a
well-shaped package.
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That is, when a cone-shaped package is formed, there is a need to increase
the traverse speed on the shorter diameter side to reduce the amount of yarn
wound there, and decrease the traverse speed on the longer diameter side to
increase the amount of yarn wound there. In the above traverse apparatus
having rotating wings, however, the traverse speed is the same on both the
longer and shorter diameter sides of the package, thus making it difficult to
obtain a cone-shaped package.
-
In view of the foregoing circumstances, it is an object of the present
invention to provide a traverse apparatus having rotating wings in which a well-formed
cone-shaped package can be obtained.
Summary of the Invention
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To achieve the above object, a traverse apparatus having rotating wings
according to the present invention comprises two yarn guide rotating wings that
rotate in opposite directions, an elliptical driven gear provided at the input
section of the yarn guide rotating wing, and an elliptical drive gear engaged
with the driven gear and provided at the output section of a drive motor,
wherein the yarn guide rotating wing is pulsated and rotated by means of the
gears to change the traverse speed in the axial direction of a cone-shaped
package, and an engagement of the gears is set so that the traverse speed is
faster on the shorter diameter side of the package and slower on the longer
diameter side thereof.
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According to the present invention, the yarn guide rotating wing is
pulsated and rotated by employing the elliptical drive gear and the driven gear
to change the traverse speed in the axial direction of the cone-shaped package.
In addition, the engagement of the above drive and driven gears are set so
that the traverse speed is fast on the shorter diameter side of the package and
is slower on the longer diameter side thereof. Thus, the amount of yarn wound
there is small on the shorter diameter side of the package and is large on the
longer diameter side thereof, so that a well-shaped cone-shaped package can be
obtained.
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In addition, the gears may engage in such a way as to be positioned on a
path in which a minimum traverse speed using the yarn guide rotating wing is
changed from the longer diameter side to the shorter diameter side of the cone-shaped
package and so as to be positioned on the path in which a maximum
traverse speed is changed from the shorter diameter side to the longer diameter
side.
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By doing this, the average traverse speed on the path from the longer
diameter side to the shorter diameter side of the package is slower than that
on the path from the shorter diameter side to the longer diameter side. Thus,
the length of a yarn wound on the path from the longer diameter side to the
shorter diameter side becomes longer than that of a yarn wound on the path from
the shorter diameter side to the longer diameter side. In addition, the wind
number on the path from the longer diameter side to the shorter diameter side
becomes larger than that on the path from the shorter diameter side to the
longer diameter side. As a result, the yarn release action is improved.
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A detailed description of this operation will be given with reference to
Figures 6 and 7.
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In general, if the wind number (number of coils) during winding is
excessive, the compression inside the package advances as the winding diameter
increases. As shown in Figure 6A, the internal yarn layer is deformed,
resulting in a bulge in the package such that both end faces protrude. To
prevent this, the wind number required for obtaining a proper package shaped
like that shown in Figure 6B is currently determined from experience depending
on the yarn count and the material of the yarn.
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On the other hand, in Figures 7A and 7B describe the wind number from the
viewpoint of ease of release. Figure 7A shows a package with a small wind
number, and the curvature R of the yarn is small at the release point at which
the yarn is released from the package surface. Figure 7B shows a package with
a large wind number, wherein the curvature R is large at the release point.
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When these packages are compared with each other, in the case of the
package with a small curvature R shown in Figure 7A, the yarn is easily released
from the package surface, the release balloon rise is initiated well,
frictional contact with the low-wound yarn is small, and the yarn in the lower
layer hardly moves. In the case of the package with the large curvature R shown
in Figure 7B, frictional contact with the low-wound yarn is large, thus causing
the rise of the release balloon to be poorly initiated. In addition, the
rotating release yarn is moved due to friction with the package surface, and
winds a fluff or the like of the lower layer yarn, and thus, the yarn in the
lower layer moves in the release direction.
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In the case of yarn in the lower layer that is moved as described above,
the package is tapered and cone-wound, the wind number is large, and the winding
angle is small. Thus, the coil is easily loosened, and yarn cutting caused by
tangling with the release yarn is likely to occur. If the angle shown in
Figure 7B is as large as possible, the curvature R becomes small, thus improving
the release action. It is possible to increase the angle by making
adjustment so as to increase the wind number, however, as described previously,
the maximum wind number is limited by the need to obtain a properly shaped
package.
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In the case where the release point moves from the longer diameter side to
the shorter diameter side, i.e., in the case where the release point moves in
the same direction as the yarn lead-out direction, the angle of the package
with a small wind number becomes larger than that of the package with a large
wind number. In the case where the release point moves from the shorter
diameter side to the longer diameter side in the opposite direction from the
yarn lead-out direction, the angle of the package with a large wind number
becomes larger. Therefore, during winding, the apparatus offers a superior
release action when the wind number on the path from the longer diameter side
to the shorter diameter side is larger than that on the path from the shorter
diameter side to the longer diameter side.
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The present invention has been made in consideration of the above
circumstance. According to the present invention, the wind number ratio
between the forward path and the backward path is changed without changing the
total wind numbers of forward and backward, thereby making it possible to
perform winding with improved yarn release action and ensure that the package
shape is properly maintained.
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In addition, the above traverse apparatus having rotating wings comprises a
sensor for detecting the rotation speed of the package and a control section
for adjusting the rotation speed of the drive motor according to the output of
the sensor, wherein the control section may maintain a relationship between
package rotation and yarn guide rotating wing rotation irrespective of the
package rotation speed.
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By doing this, in the case where the package is contacted, rotated, and
driven by means of the friction drum, even if there is some slip between the
friction drum and the package when rotation is initiated after yarn splicing,
the relationship between the package rotation and the yarn guide rotating wing
rotation is maintained by means of the above sensor and the control section,
thereby making it possible to form a proper package free from traverse
disturbance.
Brief Description of the Drawing
-
- Figure 1 is a schematic view of a traverse apparatus having rotating wings
according to one embodiment of the present invention.
- Figure 2 is a schematic view showing the relationship among a drive gear
and a driven gear of the traverse apparatus having rotating wings, a momentary
state of a yarn to be wound around a package, and the traverse speed.
- Figure 3 is a schematic view showing an outlook of release of the yarn
wound around the package.
- Figure 4 is a schematic view showing the relationship among the drive gear
and the driven gear of the traverse apparatus having rotating wings, the average
state of the yarn wound around the package, and the traverse speed.
- Figure 5 is a schematic view showing the relationship among the drive gear
and the driven gear of the traverse apparatus having rotating wings embodied
according to the present invention, the average state of the yarn to be wound
around the package, and the traverse speed.
- Figure 6 is a schematic view showing the relationship between the wind
number and package deformation (bulge), and Figure 6A is a schematic view of a
bulge package in which the wind number is too high, and Figure 6B is a
schematic view of a package with a proper wind number.
- Figure 7 is a schematic view showing the relationship between the wind
number and the yarn release action, and Figure 7A is a schematic view showing a
state in which the yarn is released from a package with less wind number, and
Figure 7B is a schematic view showing a state in which the yarn is released from
a package with more wind number.
- Figure 8 is a schematic view of the traverse apparatus having rotating
wings according to one embodiment of the present invention.
- Figure 9 is a schematic view showing a state when the yarn is transferred
using the yarn guide rotating wing of the traverse apparatus having rotating
wings of the embodiment shown in Figure 8, and Figure 9A is a drawing showing
the first step of the operations, and Figure 9B is a drawing of the second step
of the operations, and Figure 9C is a drawing showing the third step of the
operations.
- Figure 10 is a schematic view showing the holding plate of the traverse
apparatus having rotating wings in the embodiment of Figure 8.
- Figure 11 is a side view of the traverse apparatus having rotating wings in
the embodiment of Figure 8.
- Figure 12 is a schematic view of a conventional traverse apparatus having
rotating wings.
- Figure 13 is a schematic view showing a state when a yarn to be traversed
is twisted by a conventional traverse apparatus having rotating wings.
- Figure 14 is a schematic view showing a package when alternate twisting is
performed by a conventional traverse apparatus having rotating wings.
- Figure 15 is a schematic view showing a state when a striped pattern is
produced in a cloth using the package of Figure 14.
-
Detailed Description of the preferred Embodiments
-
Hereinafter, an embodiment of the present invention will be described with
reference to the accompanying drawings.
-
Figure 1 is a schematic view showing a traverse apparatus having rotating
wings according to this embodiment which is used as a traverse mechanism of an
automatic winder.
-
An automatic winder winds around a cone-shaped package 2 a yarn 1 released
from a yarn supply bobbin (not shown in the drawing) while cutting and removing
defective portions of the yarn 1. The cone-shaped package 2 is contacted,
rotated, and driven by a friction drum 5 while the left and right ends of that
bobbin 3 are supported able to be rotated by a bobbin holder 4. The friction
drum 5 is supported by a bearing 6 at both the right and left ends thereof, and
is rotated and driven by a winding motor 7, a belt 8, or the like. In the
vicinity of the friction drum 5, there is disposed a traverse apparatus having
rotating wings 9 for traversing the yarn 1 to be wound around the package 2.
-
The traverse apparatus having rotating wings 9 comprises two yarn guide
rotating wings 10a and 10b rotated in opposite directions by means of a gear
mechanism (not shown in the drawing) and a yarn guide plate 12 having a guide
section 11 formed in the shape of a mound along the locus of movement of these
yarn guide rotating wings 10a and 10b. The yarn 1 moving from the yarn supply
bobbin (not shown in the drawing) to the package 2 is transferred to the above
yarn guide rotating wings 10a and 10b alternately, and is guided to the guide
section 11 of the yarn guide plate 12 and is traversed. In the yarn guide
rotating wings 10a and 10b, their rotary shafts 13a and 13b are slightly
displaced so as to be rotated at identical speeds in opposite directions by a
publicly known gear mechanism (not shown in the drawing).
-
At the input section of the gear mechanism of the yarn guide rotating wings
10a and 10b, an elliptical driven gear 14 is provided with its rotary shaft 15
being eccentrically set. At the driven gear 14, an elliptical drive gear 16 is
engaged with its rotary shaft 17 being eccentrically set. Elliptical shapes of
these driven and drive gears 14 and 16 are formed, respectively, so as to be
constantly engaged with each other. The drive gear 16 is rotated and driven by
means of a drive motor 21 via a transmission mechanism 20 comprising a pulley
18, a belt 19, or the like. The transmission mechanism 20 may be a sprocket, a
chain, or a gear train or similar device.
-
With this structure, when the drive motor 21 is rotated at a constant
speed, the driven gear 14 is pulsated and rotated via the drive gear 16. Here,
pulsating rotation means that while the driven gear 14 is rotated 360 degrees,
its angular velocity is changed. More specifically, the angular velocity of the
driven gear 14 reaches a maximum when the longer diameter section 16a of the
drive gear 16 is engaged with the shorter diameter section 14b of the driven
gear 14, as shown in Figure 1. Conversely, the angular velocity of the driven
gear 14 reaches a minimum when the shorter diameter section 16b of the drive
gear 16 is engaged with the longer diameter section 14a of the driven gear 14.
-
When the driven gear 14 is thus pulsated and rotated, the yarn guide
rotating wings 10a and 10b are pulsated and rotated at identical speeds in
opposite directions. The traverse speed of the yarn 1 changes along the axial
direction of the package 2. More specifically, the gear ratio is set so that
the single-reciprocating traverse movement in which the yarn 1 moves from the
shorter diameter end 2a of the package 2 to the longer diameter end 2b, and is
returned to the shorter diameter end 2a again is equivalent to one rotation of
the driven gear 14. Thus, the maximum traverse speed and the minimum traverse
speed each are produced once between single reciprocating traverse movement of
the yarn 1.
-
Specifically, in this embodiment, as shown in Figure 2, when the yarn 1 is
positioned at the shorter diameter end 2a of the package 2, the engagement of
the drive and driven gears 16 and 14 is set to permit the longer diameter
section 16a of the drive gear 16 to be engaged with the shorter diameter section
14b of the driven gear 14 so that the traverse speed is maximal, and when the
yarn 1 is positioned at the longer diameter end 2b of the package 2, such
engagement is set to permit the shorter diameter section 16b of the drive gear
16 to be engaged with the longer diameter section 14a of the driven gear 14 so
that the traverse speed is minimal. Thereby, the winding angle of the
package 2 becomes maximal at the shorter diameter end 2a and minimal at the
longer diameter end 2b.
-
According to this embodiment having the above structure, the elliptical
drive gear 16 and the driven gear 14 are employed, thereby to pulsate and
rotate the yarn guide rotating wings 10a and 10b and change the traverse speed
in the axial direction of the cone-shaped package 2. In addition, the
engagement of the drive gear 16 and the driven gear 14 is set so that the
traverse speed is fast at the shorter diameter end 2a of the package 2 and slow
at the longer diameter end 2b. Thus, the amount of yarn 1 wound becomes small
on the shorter diameter side and large on the longer diameter side, and a well-formed
cone-shaped package 2 can be obtained.
-
In the traverse apparatus having rotating wings 9, as shown in Figure 2,
when the yarn 1 is traversed from the shorter diameter end 2a to the longer
diameter end 2b, the traverse speed is gradually decreased. When the yarn 1 is
traversed from the longer diameter end 2b to the shorter diameter end 2a, the
traverse speed is gradually increased. Since these speed change rates are the
same, the winding angle of the yarn 1 wound from the shorter diameter end 2a to
the longer diameter end 2b becomes identical to the winding angle of the yarn 1
wound from the longer diameter end 2b to the shorter diameter end 2a.
-
After winding is completed, when the yarn 1 of the cone-shaped package 2 is
released in the next step, the winding angle pattern of the yarn released from
the shorter diameter end 2a to the longer diameter end 2b becomes identical to
that of the yarn 1 released from the longer diameter end 2b to the shorter
diameter end 2a, thereby impairing the release performance. In order to improve
the release performance, the winding angle of the yarn 1 when released from the
shorter diameter end 2a to the longer diameter end 2b should preferably be much
smaller than that of the yarn 1 when released from the longer diameter end 2b
to the shorter diameter end 2a. In the above embodiment, however, since the
winding angle from the shorter diameter end 2a to the longer diameter end 2b is
identical to that from the longer diameter end 2b to the shorter diameter end
2a, there is room for improvement regarding the release performance.
-
This fact can be understood by examining the average of the traverse
speeds. In the above embodiment, the traverse speed is actually changed along
the axial direction of the package 2, as indicated by the winding angle of
Figure 2. However, since the traverse speed is maximal at the shorter diameter
end 2a and is minimal at the longer diameter end 2b, the average traverse speed
from the shorter diameter end 2a to the longer diameter end 2b becomes identical
to that from the longer diameter end 2b to the shorter diameter end 2a.
-
Assuming that the yarn 1 is wound at that average traverse speed, when that
winding angle is virtually represented, as shown in Figure 4, the winding angle
of the yarn 1a wound from the short diameter end 2a to the longer diameter end
2b becomes identical to that of a yarn 1b wound from the longer diameter end 2b
to the shorter diameter end 2a. Assuming that the yarn 1 of such a package 2 is
released, as shown in Figure 3, the winding angle of the yarn 1b when the yarn
1b wound from the longer diameter end 2b to the shorter diameter end 2a is
released from the shorter diameter end 2a to the longer diameter end 2b (in
hardly released direction) becomes identical to that of the yarn 1a when the
yarn 1a wound from the shorter diameter end 2a to the longer diameter end 2b is
released from the longer diameter end 2b to the shorter diameter end 2a (in
easily released direction), thus impairing the release performance of the former
yarn 1b. To enhance the release performance of this yarn 1b, the winding angle
of the former yarn 1b may be decreased as indicated by the dashed line 26.
-
As shown in Figure 5, the present invention is configured such that the
engagement position between the above driven gear 14 and the drive gear 16 is
set so that the maximum traverse speed is shifted to the path from the shorter
diameter end 2a to the longer diameter end 2b, and the minimum traverse speed is
shifted to the path from the longer diameter end 2b to the shorter diameter end
2a. In the case of this embodiment, as shown in Figure 5, with respect to the
drive gear 16 and the driven gear 14, at the shorter diameter end 2a, the
immediately preceding part of the longer diameter section 16a of the drive gear
16 are engaged with the immediately preceding part of a shorter diameter section
14b of the driven gear 14. In addition, at the longer diameter end 2b, the
immediately preceding part of the shorter diameter section 16b of the drive gear
16 is engaged with the immediately preceding part of the longer diameter
section 14a of the driven gear 14.
-
Thus, by setting the engagement of the gears 14 and 16, the average
traverse speed from the shorter diameter end 2a to the longer diameter end 2b
(indicated by the broken line 23 in Figure 5) is faster than that from the
longer diameter end 2b to the shorter diameter end 2a (indicated by the dashed
line 24 in Figure 5). Assuming that the yarn 1 is wound at these average
traverse speeds 23 and 24, when the winding angles of the yarns 1a and 1b are
virtually represented, the winding angle of the yarn 1a wound from the shorter
diameter end 2a to the longer diameter end 2b is increased, the yarn 1a has a
shorter yarn length and has fewer windings, as indicated by the broken line 25
in Figure 5. The winding angle of the yarn 1b wound from the longer diameter
end 2b to the shorter diameter end 2a is decreased, the yarn 1b has a longer
yarn length and has more windings, as indicated by the dashed line 26 in Figure
5.
-
In such a package 2, the yarn 1a (indicated by the broken line 25 in Figure
5) wound from the shorter diameter end 2a to the longer diameter end 2b is
released from the longer diameter end 2b to the shorter diameter end 2a. In
addition, the yarn 1b (indicated by the dashed line 26 in Figure 5) wound from
the longer diameter end 2b to the shorter diameter end 2a is released from the
shorter diameter end 2a to the longer diameter end 2b. As shown in Figure 3,
in the above package 2, the winding angle of the yarn 1a when it is released
from the easily released longer diameter end 2b to the shorter diameter end 2a
is increased as indicated by the broken line 25 (corresponding to broken line
25 in Figure 5), thereby improving the release performance. In addition, the
winding angle of the yarn 1b when it is released from the hardly released
shorter diameter end 2a to the longer diameter end 2b is decreased as indicated
by the dashed line 26 (corresponding to dashed line 26 in Figure 5), thereby
improving the release performance.
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In this embodiment, as shown in Figure 5, the maximum traverse speed is set
between the shorter diameter end 2a and the center section 2c of the package 2,
and the minimum traverse speed is set between the longer diameter end 2b and
the center section 2c of the package 2. Thus, as in the aforementioned
embodiment shown in Figure 2, the winding angle of the shorter diameter end
2a is greater than that of the longer diameter end 2b, and a winding quantity
of the yarn 1 on the shorter diameter side is smaller than that of the yarn 1
on the longer diameter side, so that a well-formed cone-shaped package 2 can be
obtained. The advantage of this embodiment is that a well-shaped cone-shaped
package 2 can be obtained in a similar manner to that in the aforementioned
embodiment, and a package 2 with good release action can be obtained.
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As shown in Figure 1, a sensor 27 for detecting the rotation speed of the
package 2 is disposed in the vicinity of the bobbin holder 4 of the above
package 2. In addition, a control section 28 for adjusting the rotation speed
of the above drive motor 21 according to the output of that sensor 27 is
provided. Thereby, the relationship between the rotation of the package 2 and
the rotation of the yarn guide rotating wings 10a and 10b may be maintained by
means of the control section 28 irrespective of the rotation speed of the
package 2.
-
By doing this, after the automatic winder has temporarily stopped the
friction drum 5 and the package 2 during cutting and removal of defective
portions of the yarn 1, and has spliced the yarn 1, even if the rotation of the
package 2 is not increased because there is some slip between the friction drum
5 and the package 2 when the stopped friction drum 5 is restarted, a
predetermined relationship between the rotation of the package 2 and the
rotation of the yarn guide rotating wings 10a and 10b is maintained by means of
the above sensor 27 and the control section 28, thereby making it possible to
form a proper package 2 free from traverse disturbance.
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In a general automatic winder, a traverse drum with an engraved traverse
groove (not shown in the drawings) is rotated and driven in contact with the
package 2. Thus, if there is some slip between the traverse drum and the
package 2 when the temporarily stopped traverse drum is restarted at the time
of yarn splicing, traversing is done in a state in which rotation of the
package 2 is not increased, thus producing traverse disturbance.
-
Conversely, in this embodiment, a predetermined relationship between the
rotation of the package 2 and the rotation of the yarn guide rotating wings 10a
and 10b is always maintained by means of the above sensor 27 and the control
section 28, thereby making it possible to form a proper package 2 free from
traverse disturbance even if there a slip is produced between the friction drum
5 and the package 2 at the time of yarn splicing.
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The traverse apparatus having rotating wings shown in Figure 12 rotates two
yarn guide rotating wings b1 and b2 with rotary shafts a1 and a2 being slightly
displaced in opposite directions at the same speed, pushes a yarn d wound
around a package c at the side section of the yarn guide rotating wing b, and
moves the yarn d along a yarn guide plate e. In addition, the traverse
apparatus transfers the yarn d at both ends of the package c from the side
section of one yarn guide rotating wing b1 to the side section another yarn
guide rotating wing b2, thereby making it possible to reciprocate it in the
axial direction of the package c (Refer to the Japanese Patent laid open
(Tokkai-Hei) No. 9-86793).
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In such a traverse apparatus having rotating wings, as shown in Figure 13,
the yarn d is pushed at the side section of the yarn guide rotating wing b, is
rolled on the yarn guide plate e, and is traversed. Thus, when the yarn d is
traversed from the right to the left and vice versa, a twist in the yarn d is
produced in the reverse direction. As a result, as shown in Figure 14, an S-twist
section g and a Z-twist section h are produced alternately at the yarn d
wound around the package c.
-
The package c of the yarn d at which periodic alternating twists are thus
produced is low in commodity value. For example, in the case where the package
c around which the yarn d is wound is to serve as a weft such as air jet room,
when the width of a woven fabric matches the false twisting period, an
undesireable striped pattern is produced on the woven fabric i, as shown in
Figure 15.
-
In view of the foregoing circumstances, the traverse apparatus having
rotating wings of the automatic winder shown in Figures 8 to 11 is designed so
as not to produce a twist in the yarn. This traverse apparatus having rotating
wings will be described below.
-
An automatic winder winds a yarn 1 released from a yarn supply bobbin (not
shown in the drawings) around a cone-shaped winding package 2 while cutting and
removing defective sections of the yarn 1. The winding package 2 is supported
able to be rotated by means of a holder (not shown in the drawings) at the
right and left ends thereof, and is contacted, rotated, and driven by means of a
friction drum 5, as shown in Figure 10. A traverse apparatus having rotating
wings 9 for traversing the yarn 1 around the package 2 is disposed in the
vicinity of the friction drum 5.
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The traverse apparatus having rotating wings 9 has two yarn guide rotating
wings 36a and 36b with rotary shafts 35a and 35b being slightly displaced, as
shown in Figure 8. Each of the yarn guide rotating wings 36a and 36b is rotated
in the opposite direction at the same speed by means of a publicly known gear
mechanism housed in a gear case 37, as shown in Figure 11. The gear ratio of
the above gear mechanism is set so that these yarn guide rotating wings 36a and
36b overlap at both ends (both traverse ends) of the winding package 2.
-
Yarn holding sections 38a and 38b, respectively, for holding the yarn 1
moving from the yarn supply bobbin to the winding package 2, are provided at
the tips of the yarn guide rotating wings 36a and 36b. Each of the yarn holding
sections 38a and 38b is formed stepwise, i.e., at a lower section in the
forward rotation direction and at an upper section in the backward rotation
direction of the yarn guide rotating wings 36a and 36b so as to transfer the
held yarn 1 from the yarn holding section 38a of one yarn guide rotating wing
36a to the yarn holding section 38b of the other yarn guide rotating wing 36b,
as shown in Figures 9A, 9B and 9C.
-
More specifically, the yarn holding sections 38a and 38b have lower step
sections 39a and 39b in the forward rotation direction of the respective yarn
guide rotating wings 36a and 36b, upper step sections 40a and 40b in the
backward rotation direction, and U-shaped cavity sections 41a and 41b provided
at connection sections thereof for substantially holding the yarn 1. The lower
step sections 39a and 39b, and the upper step sections 40a and 40b are formed
centrosymmetrically at both ends of the yarn guide rotating wings 36a and 36b
around the rotary shafts 35a and 35b of the yarn guide rotating wings 36a and
36b provided therewith.
-
U-shaped grooved ceramic parts may be engaged in the cavity sections 41a
and 41b to prevent wear. The upper step sections 40a and 40b are arc-shaped
around the rotary shafts 35a and 35b of the yarn guide rotating wings 36a and
36b provided therewith. As shown in Figures 9A, 9B and 9C, the lower step
section 39b (also 39a) are tapered so as to push up the yarn 1 held on the yarn
holding section 38a of the yarn guide rotating wing 36a together with the
relative rotation of the yarn guide rotating wings 36a and 36b, remove the yarn
1, and transfer it to the yarn holding section 38b, and these sections 39a and
39b serve as the yarn removing section (hereinafter, designated by reference
numeral 39).
-
The yarn removing section 39b (also 39a) is formed so that the front parts
thereof are depressed beneath the yarn 1 held at the cavity section 41a of the
other yarn holding section 38a, as shown in Figure 9A, and an intermediate part
is formed so as to push up the depressed yarn 1 in the cavity section 41a, as
shown in Figure 9B, and a rear part is formed so as to be overlapped with or
higher than the upper step section 40a of another yarn holding section 38a, as
shown in Figure 9C and Figure 1, and entirely, these sections are tapered and
lower than the above upper step section 40a.
-
The tapered shape of each of the yarn removing sections 39a and 39b is
formed centrosymmetrically at both ends of the yarn guide rotating wings 36a and
36b with respect to the rotary shafts 35a and 35b of the yarn guide rotating
wings 36a and 36b provided therewith. As shown in Figure 1 and Figure 2C, the
deviation quantity of the rotary shafts 35a and 35b of the two yarn guide
rotating wings 36a and 36b is set so that the yarn removing section 39b of one
yarn guide rotating wing 36b is overlaid on the upper step section 40a of the
other yarn guide rotating wing 36a. Thereby, the length between the rotary
shaft 35a of the yarn guide rotating wing 36a and the upper step section 40a
essentially matches that between the rotary shaft 35b of the yarn guide
rotating wing 36b and the rear part of the yarn removing section 39b.
-
According to this kind of structure, these two yarn guide rotating wings
36a and 36b are rotated in opposite directions, and every time these yarn guide
rotating wings 36a and 36b overlap each other at both ends (both traverse ends)
of the winding package 2, as shown in Figures 9A, 9B and 9C, the yarn 1 in the
cavity section 41a of the holding section 38a of one yarn guide rotating wing
36a (the upper side in Figure 9) is pushed up and removed by the yarn removing
section 39b of the other yarn guide rotating wing 36b (the lower side in Figure
9), and is securely transferred to the cavity section 41b of the holding section
38b of the other yarn guide rotating wing 36b (the lower side in Figure 9).
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In order to facilitate yarn removal, it is preferable to form the rear part
of the yarn removing section 39b of the lower yarn holding section 38b so as to
be slightly higher than the upper step section 40a of the upper yarn holding
section 38a, as shown in Figure 2C and Figure 1. If it is formed too high,
however, the yarn removing section 39b causes the yarn 1 to jump up and slip off
the holding section 38b. The rear part should therefore be formed at a
suitable height. Actually, as shown in Figure 2C and Figure 1, it is
sufficient that the upper step section 40a of the upper yarn holding section
38a overlaps the rear part of the yarn removing section 39b of the lower yarn
holding section 38b.
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According to the traverse apparatus having rotating wings 9 of this
embodiment, the yarn 1, which is held by the yarn holding section 38a of one
yarn guide rotating wing 36a and then traversed as shown in Figures 9A, 9B and
9C, is transferred to the yarn holding section 38b of the other yarn guide
rotating wing 36b at one end of the winding package 2, and the yarn 1 is
subsequently traversed in the reverse direction by means of the other yarn
guide rotating wing 36b. Then, the yarn 1 traversed in the reverse direction by
the other yarn guide rotating wing 36b is transferred to the yarn holding
section 38a of yarn guide rotating wing 36a at the other end of the winding
package 2. Thus, the yarn 1 is transferred alternately to the yarn holding
sections 38a and 38b of the yarn guide rotating wings 36a and 36b at both ends
of the package 2, and is reciprocally traversed.
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Thus, according to the traverse apparatus having rotating wings 9 of this
embodiment, the yarn 1 moving from the yarn supply bobbin to the winding
package 2 is transferred alternately in air and traversed at the yarn holding
sections 38a and 38b provided at the tip end of each of the yarn guide rotating
wings 36a and 36b. Thus, the yarn guide plate e required for guiding the yarn d
in a conventional apparatus of the type shown in Figure 5 is eliminated, and
the problem that alternate twists of the yarn d shown in Figure 14 are produced
by the yarn d being rolled in contact with the yarn guide plate e is avoided.
According to the traverse apparatus having rotating wings 9, a high quality
winding package 2 with less twisted yarn 1 can be manufactured.
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According to the traverse apparatus having rotating wings 9 of this
embodiment, the yarn 1 is held by the yarn holding sections 38a and 38b at the
tip ends of the yarn guide rotating wings 36a and 36b, and is traversed in an
arc-shape. Thus, the yarn path length from the yarn guide 42 shown in Figure 11
to the winding point 43 of the package 2 via the yarn holding sections 38a and
38b is essentially constant during the traversing operation, and variations in
the tension of the yarn 1 to be wound are greatly reduced. Thereby, a properly
shaped and less crumbling package can be obtained.
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In a conventional apparatus like that shown in Figure 12, the yarn d is
pushed to the side of the yarn guide rotating wing b, and is traversed along
the yarn guide plate e, thus making the above yarn path length (see Figure 11)
different at both ends and the center section of the package c. Therefore,
variations in the tension of the yarn d to be wound cannot be avoided.
According to the traverse apparatus having rotating wings 9 of this embodiment,
as shown above, the yarn 1 is held at the tip end of each of the yarn guide
rotating wings 38a and 38b, and is traversed in an arc-shaped path. Thereby,
the above yarn path length becomes constant, thus making it possible to
minimize variations in the tension of the yarn 1.
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An automatic winder to which the above traverse apparatus having rotating
wings 9 is mounted winds the yarn 1 of the yarn supply bobbin around the
winding package 2 while cutting and removing defective sections. Thus, the yarn
1 may be cut to remove such defective sections. In the cut yarn 1 cut in this
manner, an upper yarn 1a thereof is positioned on the side of the winding
package 2, and a lower yarn 1b is positioned on the side of the yarn supply
bobbin. These yarns, respectively, are held by a conventional suction mouse,
are moved to the yarn splicing apparatus 44 shown in Figures 10 and 11, and
spliced thereto.
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Normally, as shown in Figure 10, the spliced yarn 1 slips off from the yarn
holding section 38b (38a) of the yarn guide rotating wing 36b (36a) because its
position is uncertain. In addition, as shown in Figures 9A, 9B and 9C, when
the yarn 1 is transferred and traversed, the yarn 1 is thought to slip off from
the yarn holding sections 38a and 38b for any number of reasons. Thus, in the
case where the yarn 1 slips off from the yarn holding sections 38a and 38b, the
yarn 1 must engage the yarn holding sections 38a and 38b again. A holding
plate 45 shown in Figures 10 and 11 has been invented to ensure such engagement.
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As illustrated, the holding plate 45 is disposed in the lower vicinity of
the yarn guide rotating wings 36a and 36b along the axial direction of the
winding package 2, and has a yarn contact section 46 with which the yarn 1
slipping off from the yarn holding section 38a and 38b comes into contact at
the time of yarn splicing. The yarn 1 slipping off from the yarn holding
sections 38a and 38b is tensioned at a predetermined tension between the winding
package 2 and the yarn supply bobbin, thus coming into contact with the yarn
contact section 46 of the holding plate 45. As shown in Figure 10, the yarn
contact section 46 is formed in the shape of a mound crossing the arc locus of
the yarn removing section 39b (39a) in sync with rotation of the yarn guide
rotating wing 36b (36a). The contact section 46 is molded at a height lower
than the arc locus of the cavity section 41b (41a) in accompany with the
rotation of the yarn guide rotating wing 36b (36a).
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With this structure, as shown in Figure 10, the yarn 1 slipping off from
the yarn holding section 38b is held at the yarn contact section 46 of the
holding plate 45 at the time of yarn splicing, and is formed in the shape of a
mound. Thus, the yarn 1 is scooped up by the yarn removing section 39b of the
yarn holding section 38b of that yarn guide rotating wing 36b by restarting the
rotation of the yarn guide rotating wing 36b, and automatically engages the
cavity section 41b of that yarn holding section 38b again. Since the yarn
contact section 46 is formed at a height lower than the arc locus of the cavity
section 41b, the yarn 1 engaged the cavity section 41b neither comes into
contact with nor interferes with the yarn contact section 46 during traversing.
The alternate twisting usually caused by contact is avoided.
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The holding plate 45 in this embodiment, as shown in Figures 10 and 11, is
similar in shape to the conventional yarn guide plate e shown in Figure 12.
However, the function of the holding plate 45 is completely different from the
conventional plate e. Unlike the conventional yarn guide plate e, the plate 45
does not have a function for guiding the yarn d to be traversed. At the time of
yarn splicing, the yarn 1 slipping off from the yarn holding sections 38a and
38b is temporarily held so as to engage the yarn holding sections 38a and 38b
again. After the yarn 1 engages the yarn holding sections 38a and 38b, there
is no contact with the yarn 1.
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At both of the most traverse ends (see Figure 9C), as indicated by a
virtual line 47 of Figure 10, both ends of the yarn contact section 46 may be
formed so that yarn removal is assisted when the yarn 1 in the cavity section
41b (41a) is pushed into contact with the yarn contact section 46 of the holding
plate 45. Thus, as shown in Figures 9A, 9B and 9C, the yarn 1 in the cavity
section 41a (41b) is removed by the yarn removing section 39b (39a) of another
yarn guide rotating wing 36b (36a). Further, as indicated by a virtual line 47
of Figure 10, the yarn is pushed into contact with the yarn contact section 46
of the holding plate 45 and is removed. Thus, the yarn 1 is removed with
certainty and transferred in a timely manner because the position at which the
yarn 1 is removed becomes stable.
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As shown in Figure 11, the above holding plate 45 is provided so as to
cover the lower section of the yarn guide rotating wings 36a and 36b, which
rotates at a high speed, thus serving as a safety cover. In addition, in Figure
10, at a position opposite to both the traverse right and left ends of the
holding plate 45, there may be provided an auxiliary guide (not shown in the
drawings) for pressing the yarn 1 to be transferred from one yarn guide
rotating wing 36a (36b) to the other yarn guide rotating wing 36b (36a),
respectively.
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As has been described, the traverse apparatus having rotating wings
according to the present invention has the following advantages over the prior
art.
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According to the traverse apparatus having rotating wings, a well-formed
cone-shaped package can be produced.
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According to the traverse apparatus having rotating wings, a cone-shaped
package with superior release performance can be provided.
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According to the traverse apparatus having rotating wings, a cone-shaped
package free from traverse disturbance at the time of yarn splicing can be
provided.