FIELD OF THE INVENTION
[0001] The present invention relates to a traverse drum and a yarn winding device using
the same. The present invention particularly relates to a traverse drum allowing a
yarn to be wound on a package while traversing the yarn and a yarn winding device
using the traverse drum.
BACKGROUND ART
[0002] There is disclosed a yarn winding device for manufacturing a package by rewinding
a yarn from a yarn supplying bobbin using a traverse drum on which traverse grooves
traversing the yarn are formed on a peripheral surface thereof (see, for example,
Patent Document 1). In this yarn winding device, the traverse drum rotates while a
peripheral surface thereof contacts with the package and the package rotates to follow
up rotation of the traverse drum. Further, the traverse grooves are formed on the
traverse drum so as to provide a predetermined number of wind. If the package is manufactured
using the traverse drum providing one number of wind, so-called ribbon winding occurs
when a predetermined relationship is held between the number of rotations of the traverse
drum and that of the package. The ribbon winding is a phenomenon that a cycle of traversing
a yarn by the traverse drum tunes to a cycle of winding the yarn by the package, the
yarn wound by the package passes through a same yarn route, the yarn concentrates
on a same place, overlap, and is wound into the form of a ribbon. The ribbon winding
causes yarn break resulting from sloughing or latching at the time of unwinding the
yarn from the package as a later step and eventually causes an unwinding defect. The
sloughing is the phenomenon that the yarn is entangled and unreeled at a breath and
the latching is the phenomenon that the unreeled yarn is turned upside down.
[0003] There has been proposed a yarn winding device for manufacturing a package using a
traverse drum on which traverse grooves providing two different numbers of wind, respectively
are formed so as to prevent occurrence of the ribbon winding. In this yarn winding
device, a yarn is normally wound on the basis of the traverse groove providing one
of the numbers of wind, and the traverse groove is switched over to another traverse
groove providing the other number of wind only when the number of wind of the yarn
wound around the package relative to the number of wind of this basic traverse groove
falls in a predetermined range in which the ribbon winding occurs, thereby preventing
an occurrence of the ribbon winding. A conventional traverse drum on which traverse
grooves providing different numbers of wind, respectively are formed will now be described.
[0004] Fig. 4 is an exploded view of a peripheral surface of the conventional traverse drum,
typically showing the traverse grooves.
[0005] Referring to Fig. 4, a line indicated by a two-dot chain line is an axial direction
of the traverse drum. A 3-wind outward route is a traverse groove starting at a start
point A, passing through passing points B and C, and reaching a turn-around point
D and is indicated by a solid line. A 2-wind outward route is a traverse groove starting
at the start point A, branching at a branching point P that is a branching part, passing
through a passing point F, and reaching the turn-round point D. An interval from the
starting point A to the branching point P of the 2-wind outward route is the traverse
groove common to the 3-wind outward route and indicated by the solid line, and an
interval from the branching point P to the turn-around point D thereof is indicated
by a one-dot chain line. A 2-wind homeward route is a traverse groove starting at
the turn-around point D, passing through a passing point E, and returning to the start
point A and indicated by a broken line. The turn-around point D is a merging part
in which the 3-wind outward route merges with the 2-wind outward route. The number
of wind corresponds to the number of rotations of the traverse drum when the yarn
is traversed from the start point A to the turn-around point D on the outward route
or when the yarn is traversed from the turn-around point D to the start point A on
the homeward route. Rewinding of the yarn using the traverse grooves of the 3-wind
outward route and the 2-wind homeward route is referred to as "winding of the yarn
by 2.5 winds". Rewinding of the yarn using the traverse grooves of the 2-wind outward
route and the 2-wind homeward route is referred to as "winding of the yarn by 2 winds".
If the yarn is wound back from the yarn supplying bobbin using the traverse drum on
which such traverse grooves are formed to manufacture a package and the yarn is, for
example, a thin yarn, the yarn is normally wound by 2.5 winds. Only when the number
of wind of the yarn wound around the package falls in a predetermined range in which
the ribbon winding occurs, the yarn is wound by 2 winds.
[Patent Document 1] Patent No. 3696778
DISCLOSURE OF THE INVENTION
PROBLEM TO BE SOLVED BY THE INVENTION
[0006] The above-stated yarn winding device has a problem that stripe stages are generated
on both end surfaces of the manufactured package by switchover of the traverse groove
to another traverse groove with the different number of wind. A stripe stage is generated
whenever one traverse groove is switched over to another traverse groove with the
different number of wind. Due to this, if the package has a larger amount of yarn
winding, more stripe stages are generated.
[0007] Fig. 5 is a perspective view of a package manufactured using the traverse drum shown
in Fig. 4. Fig. 5 (1) is a perspective view viewed from a small-diameter side of the
package and Fig. 5 (2) is a perspective view viewed from a large-diameter side of
the package.
[0008] Referring to Fig. 5, a package 60 is formed into a truncated cone shape having a
yarn wound around a truncated cone winding bobbin 61 and including a small-diameter
side end surface 62 and a large-diameter side end surface 63. Stripe stags 64 each
circular in a side view and slightly protruding outward are generated on the small-diameter
side end surface 62. Likewise, stripe stages 65 are generated on the large-diameter
side end surface 63. It is to be noted that these stripe stages 64 and 65 do not cause
an unwinding defect or the like at the time of unwinding the yarn from the package
60 as a later step and do not degrade the package 60. However, an appearance of the
package 60 is slightly marred, which possibly casts doubt on the quality of the package
60.
[0009] The present invention has been achieved to solve the above-stated problems. It is
an object of the present invention to provide a traverse drum capable of making it
difficult to generate stages on both end surfaces of a package and ensuring smart
appearance of the package even if one traverse groove is switched over to another
traverse groove providing a different number of wind so as to prevent ribbon winding,
and a yarn winding device using the same.
MEANS ADAPTED TO SOLVE THE PROBLEMS
[0010] To attain the above-stated object, according to a first aspect of the present invention,
there is provided a traverse drum for allowing a yarn to be wound on a package while
traversing the yarn, including: a peripheral surface in contact with the package;
and traverse grooves formed on a peripheral surface so as to provide different numbers
of wind when the yarn is traversed from a first end of the traverse to a second end
of the traverse, wherein the traverse grooves include a branching part in which the
different numbers of wind are switched and a merging part in which the yarn branches
from the branching part and branching parts of the yarn merge together while the yarn
is traversed from the first end to the second end, the branching part is set at a
position forward of the first end, and the merging part is set at a position backward
of the second end.
[0011] By so constituting, portions of the yarn wound in the branching part and the merging
part are arranged inward of both ends of the package in a traverse direction, respectively.
Further, even if the number of wind is switched over to another number of wind on
the traverse drum, a traverse angle between the both ends of the package is constant.
[0012] According to a second aspect of the present invention based on a constitution of
the first aspect of the present invention, the branching part is set at a position
forward of the first end substantially by a half round or more in the traverse grooves,
and the merging part is set at a position backward of the second end substantially
by the half round or more in the traverse grooves.
[0013] By so constituting, the portions of the yarn wound in the branching part and the
merging part are arranged inward of the both ends of the package in the traverse direction
each by a length equal to or larger than a predetermined length, respectively.
[0014] According to a third aspect of the present invention based on the constitution of
the first aspect of the present invention, the different numbers of wind are set to
three and two, respectively, the number of wind when the yarn is traversed from the
second end to the first end is set to two, the branching part is set at a position
forward of the first end substantially by a half round in the traverse grooves, and
the merging part is set at a position backward of the second end substantially by
a three-fourths round in the traverse grooves.
[0015] By so constituting, on the traverse drum capable of switching over between the winding
of the yarn by 2.5 winds and the winding of the yarn by 2
winds, the traverse groove on the 2-wind side connecting the branching part to the merging
part is inclined with respect to a traverse direction at an angle equal to or greater
than a predetermined angle.
[0016] According to a fourth aspect of the present invention, there is provided a yarn winding
device using the traverse drum according to any one of aspects 1 to 3, including:
the package; the traverse drum rotating while contacting with the package and allowing
the package to rotate; and switching means, arranged on an upstream side of the traverse
drum in a traveling direction of the yarn, for switching the traverse grooves guiding
the yarn in the branching part when the number of wind on the package falls in a predetermined
range.
[0017] By so constituting, the branching part and the merging part are arranged at predetermined
positions, respectively, and the numbers of wind are switched in the branching part
arranged at a predetermined position.
EFFECT OF THE INVENTION
[0018] As stated so far, according to the first aspect of the present invention, portions
of the yarn in which portions the yarn is wound at the branching part and the merging
part are arranged inward of the both ends of the package in the traverse direction,
respectively. Furthermore, even if the numbers of wind on a traverse drum are switched,
the traverse angle of the yarn between the both ends of the package is constant. Due
to this, even if the numbers of wind are switched to prevent the ribbon winding when
the number of wind on the package falls in the predetermined range, it is difficult
to generate stages on the both end surfaces of the package and it is possible to manufacture
the package presenting a smart appearance.
[0019] According to the second aspect of the present invention, besides the advantage of
the first aspect of the present invention, the portions of the yarn in which portions
the yarn is wound at the branching part and the merging part are arranged inward of
the both ends of the package each by the length equal to or larger than the predetermined
length in the traverse direction, respectively. It is, therefore, possible to further
make it difficult to generate the stages on the both end surfaces of the package.
[0020] According to the third aspect of the present invention, besides the advantage of
the first aspect of the present invention, on the traverse drum capable of switching
over between the winding of the yarn by 2.5
winds and the winding of the yarn by 2 winds, the traverse groove that is on the
2-wind side connecting the branching part to the merging part is inclined with respect to
the traverse direction at an angle equal to or greater than a predetermined angle.
It is, therefore, possible to prevent an occurrence of such a traverse failure as
sticking of the yarn onto the traverse grooves.
[0021] According to the fourth aspect of the present invention, besides the advantage of
any one of the first to third aspects of the present inventions, the branching part
and the merging part are arranged at the predetermined positions, respectively and
the number of wind is switched over to another number of wind at the branching point
arranged at a predetermined position.
Due to this, the number of wind on the traverse drum can be switched over to another
number of wind at the position that can make it difficult to generate stages on the
both end surfaces of the package.
BEST MODES FOR CARRYING OUT THE INVENTION
[0022] Embodiments of the present invention will next be described referring to the drawings.
[0023] Fig. 1 is a schematic diagram showing a schematic configuration of a yarn winding
device according to a first embodiment of the present invention.
[0024] Referring to Fig. 1, a yarn winding device 10 is a device for manufacturing a package
24 by rewinding a yarn 11 from a yarn supplying bobbin 12 produced by a ring spinning
machine or the like. The yarn winding device 10 includes an unwinding assisting device
13, a tension device 14, a device 15, a yarn clearer 16, a pin cylinder 19 serving
as switching means, and a traverse drum 20 in order from an upstream side along a
traveling direction of the yarn from the yarn supplying bobbin 12 to the package 24.
[0025] The unwinding assisting device 13 is a device controlling an unreeled balloon generated
when the yarn 11 is unreeled from the yarn supplying bobbin 12. By appropriately controlling
the balloon, contact between portions of the yarn 11 when the yarn 11 is separated
from winding layers of the yarn supplying bobbin 12 can be minimized. This can reduce
sloughing, generation of fluff and the like.
[0026] The tension device 14 is a device applying a variable tension to the yarn 11 from
the yarn supplying bobbin 12 and controlling a winding tension. By appropriately controlling
the winding tension, the winding tension is kept constant since start of winding until
end of winding, thus enabling quick winding. Moreover, even during a transit period
due to yarn break, the winding tension can be promptly returned to an original tension.
[0027] The splicing device 15 is a device splicing a lower yarn on a yarn supplying bobbin
12 side to an upper yarn on a package 24 side. If the yarn 11 is separated into the
lower yarn and the upper yarn during cutting of the yarn 11 by the yarn clearer 16
or the like, then the lower yarn is guided to the splicing device 15 by a suction
mouth 17, and the upper yarn is guided to the splicing device 15 by a suction pipe
18. The splicing device 15 joins the guided lower and upper yarns together and winding
of the yarn 11 around the package 24 restarts. The yarn clearer 16 is a device detecting
a yarn defect of the traveling yarn 11 such as a slub and cutting the yarn 11.
[0028] The traverse drum 20 is a device allowing the yarn 11 to be wound on the package
24 while traversing the yarn 11 in an axial direction of the traverse drum 20 as indicated
by a two-dot chain line shown in Fig. 1. The traverse drum 20 is formed into a cylindrical
shape having a circular cross section at a diameter L, and includes a peripheral surface
22 in contact with the package 24 and traverse grooves 21 formed on the peripheral
surface 22. The traverse drum 20 is driven to rotate around an axis thereof and the
package 20 in contact with the traverse drum 20 rotates to follow up rotation of the
traverse drum 20. The traverse grooves 21 are formed along a peripheral direction
of the traverse drum 20 and formed to be displaced in the axial direction of the traverse
drum 20. The traverse drum 20 rotates with the yarn 11 guided by the traverse grooves
21, thereby traversing the yarn 11 in the axial direction of the traverse drum 20.
The traverse grooves 21 will be described later in detail.
[0029] The pin cylinder 19 is switching means, disposed on an upstream side of the traverse
drum 20 in a traveling direction of the yarn 11, for switching one traverse groove
21 guiding the yarn 11 over to another traverse groove 21 in a branching portion and
for controlling the number of wind on the traverse drum 20. The pin cylinder 19 is
controlled to be turned on or off. When the pin cylinder 19 is turned on, the pin
cylinder 19 protrudes to a position shown in Fig. 1, bends the yarn 11, and switches
the traverse grooves guiding the yarn 11. When the pin cylinder 19 is controlled to
be turned off, the pin cylinder 19 is withdrawn and the yarn 11 is guided to the traverse
groove 21 before switchover. By controlling the pin cylinder 19 to be turned on or
off, the number of wind on the traverse drum 20 is switched over to another number
of wind. It is to be noted that a sensor, not shown, detects the number of rotations
of the traverse drum 20 and that of the package 24. The number of wind of the yarn
on the package 24 is calculated from the respective numbers of rotations.
[0030] The package 24 includes a hollow truncated winding bobbin 23 around which the yarn
11 is wound and is formed into a truncated shape.
The winding bobbin 23 is supported by a cradle arm, not shown, while urging a peripheral
surface of the package 24 to always contact with the peripheral surface 22 of the
traverse drum 20. A traverse drum 20-side edge of the winding bobbin 23 is set to
be parallel to the axial direction of the traverse drum 20 in a side view, whereby
a traverse drum 20-side edge of the package 24 contacts with the peripheral surface
22 of the traverse drum 20 in the side view.
[0031] The traverse grooves 21 formed on the peripheral surface 22 of the traverse drum
20 will next be described in detail.
[0032] Fig. 2 is an exploded view of the peripheral surface of the traverse drum shown in
Fig. 1, typically showing the traverse grooves.
[0033] Referring to Fig. 2, a line indicated by a two-dot chain line is the axial direction
of the traverse drum 20. A length of the peripheral surface 22 orthogonal to the axial
direction is π×L. A width by which the yarn 11 is traversed by the traverse drum 20
has two ends, that is, a start point A that is a first end and a turn-around point
D that is a second end. A 3-wind outward route is the traverse groove 21 starting
at a start point A, passing through passing points B and C, and reaching a turn-around
point D and indicated by a solid line. A 2-wind outward route is a traverse groove
starting at the start point A, branching at a branching point P that is a branching
part, passing through a passing point F, merging at a merging point Q that is a merging
part, and reaching the turn-around point D. An interval from the start point A to
the branching point P and that from the merging point Q to the turn-around point D
of the 2-wind outward route correspond to the traverse groove 21 common to the 3-wind
outward route, and are indicated each by the solid line. An interval from the branching
point P to the merging point Q thereof is indicated by a one-dot chain line.
A 2-wind homeward route is the traverse groove 21 starting at the turn-around point
D, passing through the passing point E, and reaching the start point A and indicated
by a broken line.
[0034] The number of wind corresponds to the number of rotations of the traverse drum when
the yarn is traversed from the start point A to the turn-around point D on the outward
route or when the yarn is traversed from the turn-around point D to the start point
A on the homeward route.
On the 3-wind outward route, for example, the traverse drum 20 rotates three times
to traverse the yarn 11 from right to left on a sheet of the paper. The traverse grooves
21 are formed to provide different number of wind when the yarn 11 is traversed from
the start point A to the turn-around point D. Further, the traverse grooves 21 include
the branching point P at which the number of wind is switched over to another number
of wind and the merging point Q at which the yarn 11 branches into two parts and the
two parts merges together between the start point A and the turn-around point D. The
traverse grooves 21 formed to provide different numbers of wind are the 3
-wind outward route and the 2-wind outward route. One number of wind is switched over to
another number of wind by switching the traverse grooves 21 guiding the yarn 11 at
the branching point P. A direction indicated by an arrow in Fig. 2 is a traveling
direction and the branching point P is set at a position forward of the start point
A substantially by a half round. In other words, the branching point P is set at the
position forward of the start point A substantially by the half round or more and
the merging point Q is set at a position backward of the turn-around point D substantially
by the three-fourth round. That is, the merging point Q is set at a position backward
of the turn-around point D substantially by the half round or more.
[0035] Rewinding of the yarn 11 using the traverse grooves 21 constituted by the 3-wind
outward route and the 2-wind homeward route, respectively is referred to as "winding
of the yarn 11 by 2.5 winds". Rewinding of the yarn 11 using the traverse grooves
21 constituted by the 2-wind outward route and the 2-wind homeward route, respectively
is referred to as "winding of the yarn 11 by 2 winds". To wind the yarn 11 by 2.5
winds and to wind the yarn 11 by 2 winds, the traverse groove 21 from the branching
point P to the merging point Q indicated by the one-dot chain line in Fig. 1 and the
traverse groove 21 from the branching point P to the merging point Q indicated by
the solid line in Fig. 1, which are independent of each other, are used, respectively
and a common traverse groove is used in remaining portions.
[0036] If the yarn 11 passing through the start point A and the yarn 11 passing through
the turn-around point D substantially form both ends of the package 24, respectively,
a traverse angle formed by the yarn 11 passing through the start point A and that
passing through the turn-around point D is a constant predetermined angle on the traverse
drum 20 on which the traverse grooves 21 are formed as stated above. This is constant
even if the number of wind of the yarn 11 on the traverse drum 20 is switched from,
for example, 2.5 to 2.
[0037] If the package 24 is to be manufactured by rewinding the yarn 11 from the yarn supplying
bobbin 12 using the traverse drum 20 on which such traverse grooves 21 are formed
and the yarn is, for example, a thin yarn, the yarn 11 is normally wound by 2.5 winds.
The yarn 11 is wound by 2 winds only when the number of wind of the yarn 11 on the
package 24 falls in a predetermined range in which ribbon winding occurs.
[0038] Switchover of the number of wind of the yarn 11 on the traverse drum 20 will next
be described.
[0039] Fig. 3 is a chart showing the relationship between the number of wind of the yarn
on the package and a large-diameter side diameter of the package if the package is
manufactured by the yarn winding device shown in Fig. 1.
[0040] Referring to Fig. 3, a vertical axis indicates the number of wind on the package
24 and a horizontal axis indicates the diameter of the large-diameter side package
24. The yarn 11 is normally and basically wound by 2.5 winds and the number of wind
is switched to two only when the number of wind of on the package 24 falls in the
predetermined range in which the ribbon winding occurs. Each of a range in which the
number of wind on the package 24 is near two and a range in which the number of wind
on the package 24 is near 1.5 corresponds to the predetermined range in which the
ribbon winding occurs. When the number of wind on the package 24 is near two, the
large-diameter side package 24 has a size of about 125 mm to 130 mm. When the number
of wind on the package 24 is near 2.5, the large-diameter side package 24 has a size
of about 165 mm to 170 mm.
A control unit, not shown, calculates that the number of wind on the package 24 falls
in the predetermined range from the number of rotations of the traverse drum 20 and
that of the package 24. While the number of wind on the package 24 falls in the predetermined
range, the control unit controls the pin cylinder 19 to be turned on, switches the
traverse grooves 21 guiding the yarn 11 at the branching point P, and controls the
yarn 11 to pass through the 2-wind outward route. If the number of wind on the package
24 is out of the predetermined range, the control unit, not shown, controls the pin
cylinder 19 to be turned off and the traverse groove 21 guiding the yarn 11 to pass
through the 3-wind outward route. In this way, the package 24 without the ribbon winding
is manufactured using the traverse drum 20 on which the traverse grooves 21 with the
two different numbers of wind, respectively are formed. It is to be noted that the
numbers of wind on the traverse drum 20 may be switched by detecting the diameter
of the package 24 and thereby calculating the predetermined range in which the ribbon
winding occurs.
[0041] Judging from the foregoing, in the yarn winding device 10 using the traverse drum
20 configured as stated above, portions of the yarn 11 in which portions the yarn
11 is wound at the branching point P and the merging point Q are arranged inward of
the both ends of the package by a length equal to or larger than a predetermined length
in a traverse direction, respectively. Furthermore, even if the numbers of wind on
the traverse drum 20 are switched, the traverse angle of the yarn 11 between the both
ends of the package is constant. Due to this, even if the numbers of wind are switched
to prevent the ribbon winding when the number of wind on the package 24 falls in the
predetermined range, it is difficult to generate stages on the both end surfaces of
the package 24 and it is possible to manufacture the package presenting a smart appearance.
[0042] Moreover, on the traverse drum 20 capable of switching over between the winding of
the yarn 11 by 2.5 winds and the winding of the yarn 11 by 2
winds, the traverse groove 21 that is the 2-wind outward route connecting the branching
point P to the merging point Q and indicated by the one-dot chain line in Fig. 2 is
inclined with respect to the traverse direction at an angle equal to or greater than
a predetermined angle. It is, therefore, possible to prevent an occurrence of such
a traverse failure as sticking of the yarn 11 onto the traverse grooves 21.
[0043] Further, the branching point P and the merging point Q are arranged at the predetermined
positions, respectively and the number of wind is switched over to another number
of wind at the branching point P arranged at the predetermined position. Due to this,
the number of wind on the traverse drum 20 can be switched over to another number
of wind at the position that can make it difficult to generate stages on the both
end surfaces of the package 24.
[0044] In the above-stated embodiment, the yarn winding device 10 is configured so that
the yarn 11 can be wound around one traverse drum by 2.5 winds and 2 winds. However,
the numbers of wind of the yarn 11 may be, for example, 1.5 and two as long as the
traverse grooves providing different numbers of wind are formed on the traverse drum
so as to prevent an occurrence of the ribbon winding.
[0045] Moreover, in the above-stated embodiment, the traverse grooves providing different
numbers of wind are formed on an outward side. Alternatively, the traverse grooves
providing different numbers of wind may be formed on a homeward side or the outward
route may be replaced by the homeward route.
[0046] Additionally, in the above-stated embodiment, the branching point P is set at the
position forward of the start point A substantially by the half round and the merging
point Q is set at the position backward of the turn-around point D substantially by
the three-fourths round. However, the branching point P and the merging point Q may
be set at other positions as long as the branching point P is at the position forward
of the start point A and the merging point Q is at the position backward of the turn-around
point D.
BRIEF DESCRIPTION OF THE DRAWINGS
[0047]
[Fig. 1] Fig. 1 is a schematic diagram showing a schematic configuration of a yarn
winding device according to a first embodiment of the present invention.
[Fig. 2] Fig. 2 is an exploded view of a peripheral surface of a traverse drum shown
in Fig. 1, typically showing traverse grooves.
[Fig. 3] Fig. 3 is a chart showing the relationship between the number of wind on
a package and a diameter of a large-diameter side of the package when the package
is manufactured by the yarn winding device shown in Fig. 1.
[Fig. 4] Fig. 4 is an exploded view of a peripheral surface of a conventional traverse
drum, typically showing traverse grooves.
[Fig. 5] Fig. 5 is a perspective view of a package manufactured using the traverse
drum shown in Fig. 4, wherein Fig. 5 (1) is a perspective view viewed from a small-diameter
side of the package and Fig. 5 (2) is a perspective view viewed from the large-diameter
side thereof.
DESCRIPTION OF REFERENCE NUMERALS
[0048]
- 10
- YARN WINDING DEVICE
- 11
- YARN
- 19
- PIN CYLINDER
- 20
- TRAVERSE DRUM
- 21
- TRAVERSE GROOVE
- 22
- PERIPHERAL SURFACE
- 24
- PACKAGE
- P
- BRANCHING POINT
- Q
- MERGING POINT