YARN WINDING MACHINE
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a yarn 5 winding
machine.
2. Description of the Related Art
As a conventional yarn winding machine, there is
10 known a yarn winding machine including a yarn supplying
device adapted to supply a yarn having a core yarn, a winding
device adapted to wind the yarn into a package, and a yarn
joining device adapted to perform a yarn joining operation
to join the yarn from the yarn supplying device and the yarn
15 from the package upon disconnection of the yarn (see e.g.,
Japanese Unexamined Patent Publication No. H11-200165).
Such a yarn winding machine may include a yarn guiding
device adapted to perform a yarn guiding operation to guide
the yarn from the package to the yarn joining device.
20
BRIEF SUMMARY OF THE INVENTION
However, in the yarn winding machine described above,
a portion where the core yarn is exposed may be mixed in
the yarn wound into the package.
25 It is an object of the present invention to provide
an improved yarn winding machine. Embodiments provide a
yarn winding machine capable of preventing a portion where
a core yarn is exposed from mixing into a package.
A yarn winding machine comprises a yarn supplying
30 device adapted to supply a yarn having a core yarn; a winding
device adapted to wind the yarn into a package by forwardly
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rotating the package; a yarn joining device adapted to
perform a yarn joining operation to join the yarn from the
yarn supplying device and the yarn from the package upon
disconnection of the yarn; a yarn guiding device adapted
to perform a yarn guiding operation to guide the yarn 5 from
the package to the yarn joining device while sucking the
yarn from the package upon disconnection of the yarn;
wherein the winding device is adapted to perform a first
unwinding operation to unwind the yarn from the package by
10 reversely rotating the package when the yarn guiding device
is performing the yarn guiding operation, and to perform
a second unwinding operation to unwind the yarn from the
package by reversely rotating the package after the yarn
guiding device finishes the yarn guiding operation and
15 before the yarn joining device starts the yarn joining
operation, and the yarn guiding device is adapted to suck
the yarn from the package when the winding device is
performing the second unwinding operation.
20 BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of a spinning machine, which
is a yarn winding machine, according to one embodiment of
the present invention;
FIG. 2 is a side view of a spinning unit of the spinning
25 machine of FIG. 1;
FIG. 3 is a timing chart illustrating an operation
of the spinning unit from middle of a yarn guiding operation
to end of a yarn joining operation;
FIG. 4 is a side view of the spinning unit at the time
30 of yarn disconnection;
FIG. 5 is a side view of the spinning unit at the time
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of the yarn guiding operation;
FIG. 6 is a side view of the spinning unit at the time
of a yarn moving operation;
FIG. 7 is a side view of the spinning unit at the time
of 5 a second unwinding operation; and
FIG. 8 is a side view of the spinning unit at the time
of the yarn joining operation.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
10 An embodiment of the present invention will be
hereinafter described in detail with reference to the
accompanying drawings. The same reference numerals are
denoted on the same or corresponding portions throughout
the drawings, and redundant description will be omitted.
15 As illustrated in FIG. 1, a spinning machine (yarn
winding machine) 1 includes a plurality of spinning units
2, a yarn joining cart 3, a doffing cart (not illustrated),
a first end frame 4, and a second end frame 5. The plurality
of spinning units 2 are arranged in a row. Each spinning
20 unit 2 is adapted to form a spun yarn (yarn) Y and wind the
spun yarn Y into a package P. The yarn joining cart 3 is
adapted to perform a yarn joining operation in a spinning
unit 2, after the spun yarn Y is cut, or is broken for some
reason in such a spinning unit 2. The doffing cart is
25 adapted to doff the package P and to supply a new bobbin
B to the spinning unit 2 when the package P is fully-wound
in a spinning unit 2. The first end frame 4 accommodates,
for example, a collecting device adapted to collect fiber
waste, yarn waste, and the like generated in the spinning
30 units 2.
The second end frame 5 accommodates an air supplying
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section adapted to adjust air pressure of compressed air
(air) to be supplied to the spinning machine 1 and to supply
the air to each section of the spinning machine 1, a drive
motor adapted to supply power to each section of the
spinning unit 2, and the like. The second end frame 5 5 is
provided with a machine control device (setting section)
41, a display screen 42, and an input key 43. The machine
control device 41 is adapted to intensively manage and
control each section of the spinning machine 1. The display
10 screen 42 is capable of displaying information relating to
set contents and/or status, or the like of the spinning
units 2. An operator can perform a setting operation of
the spinning units 2 by performing an appropriate operation
with the input key 43.
15 In the following description, on a travelling path
of a sliver S, a fiber bundle F (see FIG. 2), and the spun
yarn Y, a side on which the sliver S is supplied is referred
to as upstream, and a side on which the spun yarn Y is wound
is referred to as downstream. A side on which the spun yarn
20 Y travels with respect to the yarn joining cart 3 is referred
to as a front side, and a side opposite to the front side
is referred to as a back side. In the present embodiment,
a work passage (not illustrated) extending in a direction
in which the plurality of spinning units 2 are arranged is
25 provided on the front side of the spinning machine 1.
Therefore, the operator can perform operation, monitoring,
and the like of each spinning unit 2 from the work passage.
As illustrated in FIGS. 1 and 2, each spinning unit
2 includes a draft device (yarn supplying device) 6 and a
30 core yarn supplying device (yarn supplying device) 200, a
pneumatic spinning device (yarn supplying device) 7, a yarn
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monitoring device 8, a tension sensor 9, a yarn storage
device 11, a waxing device 12, and a winding device 13 in
this order from upstream in a travelling direction of the
spun yarn Y. A unit controller (control section) 10 is
provided for every predetermined number of 5 the spinning
units 2 and is adapted to control operations of the spinning
units 2.
The draft device 6 is adapted to draft a sliver (fiber
bundle) S. The draft device 6 includes a pair of back
10 rollers 14, a pair of third rollers 15, a pair of middle
rollers 16, and a pair of front rollers 17 in this order
from upstream in a travelling direction of the sliver S.
Each pair of rollers 14, 15, 16, and 17 includes a bottom
roller and a top roller. The bottom roller is rotationally
15 driven by the drive motor provided in the second end frame
5 or by a drive motor provided in each spinning unit 2. An
apron belt 18a is provided with respect to the bottom roller
of the middle rollers 16. An apron belt 18b is provided
with respect to the top roller of the middle rollers 16.
20 The core yarn supplying device 200 unwinds a core yarn
C from a core yarn package CP, and supplies the core yarn
C to the pneumatic spinning device 7. The core yarn
supplying device 200 includes a package supporting section
50, a core yarn supplying unit 51, and a core yarn guiding
25 section 52. The package supporting section 50 supports the
core yarn package CP with a center line of the core yarn
package CP, which is formed by winding the core yarn C around
a core yarn bobbin CB, extending in a horizontal and
front-back direction. The core yarn supplying unit 51
30 applies tension to the core yarn C unwound from the core
yarn package CP and guided via a guide roller 53. The core
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yarn guiding section 52 guides the core yarn C supplied from
the core yarn supplying unit 51 to a position between the
pair of middle rollers 18 and the pair of front rollers 19
of the draft device 6. The core yarn supplying device 200
thereby supplies the core yarn C to the pneumatic 5 spinning
device 7.
The pneumatic spinning device 7 is adapted to form
the spun yarn Y having the core yarn C by applying twists
to the fiber bundle F, which has been drafted by the draft
10 device 6, with a whirling airflow, with the core yarn C
supplied from the core yarn supplying device 200 as the core.
More specifically (however, not illustrated), the
pneumatic spinning device 7 includes a spinning chamber,
a fiber guiding section, a whirling airflow generating
15 nozzle, and a hollow guide shaft body. The fiber guiding
section is adapted to guide the core yarn C supplied from
the upstream core yarn supplying device 200 and the fiber
bundle F supplied from the upstream draft device 6 into the
spinning chamber. The whirling airflow generating nozzle
20 is arranged at a periphery of a travelling path of the core
yarn C and the fiber bundle F, and a whirling airflow is
generated in the spinning chamber by the air being injected
from the whirling airflow generating nozzle. With the
whirling airflow, each fiber end of a plurality of fibers
25 that form the fiber bundle F is reversed and whirled. The
hollow guide shaft body is adapted to guide the spun yarn
Y from the spinning chamber to an outside of the pneumatic
spinning device 7.
The yarn monitoring device 8 is adapted to monitor
30 information on the travelling spun yarn Y between the
pneumatic spinning device 7 and the yarn storage device 11,
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and to detect presence or absence of a yarn defect based
on the information acquired by the monitoring. When
detecting the yarn defect, the yarn monitoring device 8
transmits a yarn defect detection signal to the unit
controller 10. The yarn monitoring device 8 detects 5 ects a
thickness abnormality of the spun yarn Y, a foreign
substance included in the spun yarn Y, and/or exposure of
the core yarn C, for example, as the yarn defect. The yarn
monitoring device 8 also detects yarn breakage or the like.
10 The tension sensor 9 is adapted to measure tension of the
travelling spun yarn Y between the pneumatic spinning
device 7 and the yarn storage device 11, and to transmit
a tension measurement signal to the unit controller 10.
When the unit controller 10 determines presence of an
15 abnormality based on a detection result of the yarn
monitoring device 8 and/or the tension sensor 9, the spun
yarn Y is cut in the spinning unit 2. Specifically, by
stopping air supply to the pneumatic spinning device 7 to
interrupt forming of the spun yarn Y, the spun yarn Y is
20 cut. Alternatively, the spun yarn Y may be cut with a cutter
separately provided.
The waxing device 12 is adapted to apply wax to the
spun yarn Y between the yarn storage device 11 and the
winding device 13.
25 The yarn storage device 11 is adapted to eliminate
slack of the spun yarn Y between the pneumatic spinning
device 7 and the winding device 13. The yarn storage device
11 has a function of stably pulling out the spun yarn Y from
the pneumatic spinning device 7, a function of preventing
30 the spun yarn Y from slackening by accumulating the spun
yarn Y fed from the pneumatic spinning device 7 at the time
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of the yarn joining operation or the like by the yarn joining
cart 3, and a function of preventing variation in the
tension of the spun yarn Y at downstream of the yarn storage
device 11 from being propagated to the pneumatic spinning
5 device 7.
The winding device 13 is adapted to forwardly rotate
the package P to wind the spun yarn Y around the bobbin B
or the package P. The winding device 13 includes a cradle
arm 21, a winding drum 22, a traverse guide 23, and a reverse
10 rotation mechanism 33. The cradle arm 21 rotatably
supports the bobbin B. The cradle arm 21 is swingably
supported by a supporting shaft 24, and is adapted to bring
a surface of the bobbin B or a surface of the package P into
contact with a surface of the winding drum 22 under
15 appropriate pressure. A drive motor (not illustrated)
provided in the second end frame 5 is adapted to
simultaneously drive the winding drums 22 each provided in
the plurality of the spinning units 2. Accordingly, in each
spinning unit 2, the bobbin B or the package P is rotated
20 in a winding direction.
The traverse guide 23 of each spinning unit 2 is
provided on a shaft 25 shared by the plurality of the
spinning units 2. By the drive motor in the second end frame
5 driving the shaft 25 to reciprocate in a direction of a
25 rotational axis of the winding drum 22, the traverse guide
23 traverses the spun yarn Y in a predetermined width with
respect to the rotating bobbin B or package P. When the
cradle arm 21 is moved by an air cylinder (not illustrated)
such that the package P moves away from the winding drum
30 22, the reverse rotation mechanism 33 brings a surface of
a reverse rotation roller 33a into contact with the surface
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of the package P under an appropriate pressure to reversely
rotate the package P. The reverse rotation mechanism 33
is provided in the yarn joining cart 3.
After the spun yarn Y is cut, or is broken for some
reason in a spinning unit 2, the yarn joining cart 3 trav5 els
to such a spinning unit 2 to perform the yarn joining
operation. The yarn joining cart 3 includes a splicer (yarn
joining device) 26, a suction pipe 27, a suction mouth (yarn
guiding device) 28, and a yarn moving device 34.
10 The suction pipe 27 is swingably supported by a
supporting shaft 31, and is adapted to suck the spun yarn
Y from the pneumatic spinning device 7 and to guide the
sucked spun yarn Y to the splicer 26. The suction mouth
28 is swingably supported by a supporting shaft 32, and is
15 adapted to suck the spun yarn Y from the winding device 13
and to guide the sucked spun yarn Y to the splicer 26.
The yarn moving device 34 is adapted to perform a yarn
moving operation to move the spun yarn Y from the winding
device 13 guided to the splicer 26 by a yarn guiding
20 operation towards the center of the wound width of the
package P. Specifically, the yarn moving device 34
includes a pair of yarn guide members (not illustrated) that
can be opened and closed. During the yarn guiding operation,
the pair of yarn guide members is held in the opened state.
25 In other words, the two yarn guide members are held at
positions spaced apart from each other, and are located on
both sides of the spun yarn Y from the winding device 13.
After the yarn guiding operation is finished, the pair of
yarn guide members is driven to the closed state, thus
30 moving the spun yarn Y towards the center of the wound width
of the package P.
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The splicer 26 performs the yarn joining operation
to join the guided spun yarn Y from the pneumatic spinning
device 7 and the spun yarn Y from the package P. The splicer
26 is positioned with respect to a central region of the
wound width of the package P. The splicer 26 includes 5 des a
splicer head (yarn joining section) 26a and a yarn gathering
lever (yarn gathering section) 26b. In the present
embodiment, the splicer head 26a is arranged to be movable
forward and backward with respect to a yarn path. The
10 splicer head 26a is held at a standby position away from
the yarn path when the yarn joining operation is not being
performed. To perform the yarn joining operation, after
the splicer head 26a is moved forward, the yarn gathering
lever 26b gathers the spun yarn Y from the pneumatic
15 spinning device 7 and the spun yarn Y from the package P
towards the splicer head 26a. The splicer head 26a joins
the two gathered spun yarns Y with compressed air.
Next, a description will be made on an operation of
the spinning unit 2 when the spun yarn Y is cut, with
20 reference to a timing chart of FIG. 3. The timing chart
of FIG. 3 illustrates a timing at which the unit controller
10 transmits a control signal to each device.
A case where the spun yarn Y is cut includes a case
where the spun yarn Y is cut to remove the yarn defect, and
25 a case where the spun yarn Y is unexpectedly cut. When the
spun yarn Y is cut to remove the yarn defect, the unit
controller 10 determines that the spun yarn Y is cut by the
unit controller 10 itself performing a control to cut the
spun yarn Y. More specifically, the unit controller 10
30 stops the operations of the draft device 6 and the pneumatic
spinning device 7 to cut the spun yarn Y upon receiving the
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yarn defect detection signal from the yarn monitoring
device 8 while the spun yarn Y is being formed and wound
into the package P. At this timing, the unit controller
10 determines that the spun yarn Y is cut. When the spun
yarn Y is unexpectedly cut, the unit controller 5 er 10
determines that the spun yarn Y is cut based on a yarn
detection signal transmitted from a yarn travelling sensor
(not illustrated) arranged at a predetermined position on
the travelling path of the spun yarn Y. In this case as
10 well, the unit controller 10 stops the operations of the
draft device 6 and the pneumatic spinning device 7.
When determining that the spun yarn Y is cut, the unit
controller 10 swings the cradle arm 21 and operates a brake
mechanism (not illustrated) arranged on the cradle arm 21
15 after the spun yarn Y from the package P is wound into the
package P, as illustrated in FIG. 4. The forward rotation
of the package P is thereby stopped with the package P spaced
apart from the winding drum 22. Then, the unit controller
10 transmits a control signal indicating the spinning unit
20 2, in which the spun yarn Y is determined to be cut, to the
yarn joining cart 3. The yarn joining cart 3 thus travels
to the spinning unit 2 and stops.
Then, as illustrated in FIG. 5, the unit controller
10 swings the suction pipe 27 such that a suction port of
25 the suction pipe 27 is located downstream of the pneumatic
spinning device 7 and performs a control to generate a
suction flow in the suction pipe 27. At this time, since
the unit controller 10 resumes the operations of the draft
device 6 and the pneumatic spinning device 7, the suction
30 pipe 27 can suck the spun yarn Y from the pneumatic spinning
device 7 into a suction path (not illustrated) of the
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suction pipe 27 (i.e., the suction pipe 27 catches the spun
yarn Y). Then, the unit controller 10 swings the suction
port of the suction pipe 27 towards the splicer 26. The
suction pipe 27 thus sucks the spun yarn Y from the pneumatic
spinning device 7 and guides the spun yarn Y to the sp5 licer
26.
Meanwhile, as illustrated in FIG. 5, the unit
controller 10 brings the reverse rotation roller 33a of the
reverse rotation mechanism 33 into contact with the package
10 P, and rotates the reverse rotation roller 33a (period to
T1 of FIG. 3). By frictional force between the package P
and the reverse rotation roller 33a, the package P starts
to reversely rotate accompanying rotation of the reverse
rotation roller 33a. Then, the unit controller 10 swings
15 the suction mouth 28 such that a suction port of the suction
mouth 28 is located in proximity to the surface of the
package P and performs a control to generate a suction flow
at the suction mouth 28 (time point of T1 of FIG. 3). The
suction mouth 28 thereby sucks a yarn end of the spun yarn
20 Y unwound from the package P and sucks the spun yarn Y into
a suction path (not illustrated) of the suction mouth 28
(i.e., the suction mouth 28 catches the spun yarn Y).
The unit controller 10 then performs a control of
moving the suction port of the suction mouth 28 towards the
25 splicer 26 while continuing to generate of the suction flow
of the suction mouth 28 (period from T1 to T2 of FIG. 3).
The suction mouth 28 performs the yarn guiding operation
to suck the spun yarn Y from the package P and guide the
sucked spun yarn Y to the splicer 26 in the above manner.
30 While the suction mouth 28 is performing the yarn
guiding operation, the unit controller 10 controls the
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reverse rotation mechanism 33 so as to continue the rotation
of the reverse rotation roller 33a. Accordingly, the
reverse rotation roller 33a reversely rotates the package
P to unwind the spun yarn Y from the package P. As described
above, the reverse rotation mechanism 33 (5 the winding
device 13) performs the first unwinding operation of
reversely rotating the package P to unwind the spun yarn
Y from the package P while the suction mouth 28 is performing
the yarn guiding operation (the period from T1 to T2 of FIG.
10 3).
After the suction mouth 28 finishes the yarn guiding
operation, the unit controller 10 stops the rotation of the
reverse rotation roller 33a (period from T3 to T6 of FIG.
3), as illustrated in FIG. 6. The reverse rotation of the
15 package P is thereby stopped. As described above, the
reverse rotation mechanism 33 (the winding device 13) stops
the reverse rotation of the package P between the first
unwinding operation and the second unwinding operation, to
be described later.
20 After the suction mouth 28 finishes the yarn guiding
operation, the unit controller 10 causes the yarn moving
device 34 to perform the yarn moving operation (period from
T4 to T5 of FIG. 3). The spun yarn Y from the package P
is thereby moved towards the center of the wound width of
25 the package P. The yarn moving device 34 performs the yarn
moving operation of moving the spun yarn Y from the package
P after the suction mouth 28 finishes the yarn guiding
operation and before the reverse rotation mechanism 33
starts the second unwinding operation.
30 After the yarn moving device 34 finishes the yarn
moving operation, the unit controller 10 again starts the
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rotation of the reverse rotation roller 33a, as illustrated
in FIG. 7. Accordingly, the reverse rotation roller 33a
reversely rotates the package P to unwind the spun yarn Y
from the package P. As described above, the reverse
rotation mechanism 33 (the winding device 13) performs 5 the
second unwinding operation of reversely rotating the
package P to unwind the spun yarn Y from the package P after
the suction mouth 28 finishes the yarn guiding operation
(more specifically, after the yarn moving device 34
10 finishes the yarn moving operation) and before the splicer
26 starts the yarn joining operation (more specifically,
before the yarn gathering lever 26b gathers the spun yarn
Y from the pneumatic spinning device 7 and the spun yarn
Y from the package P to the splicer head 26a).
15 The unit controller 10 performs the control of
continuing to generate the suction flow of the suction mouth
28 while the reverse rotation mechanism 33 is performing
the second unwinding operation. The suction mouth 28 thus
can suck the spun yarn Y from the package P and suck the
20 spun yarn Y into the suction path of the suction mouth 28
while the reverse rotation mechanism 33 is performing the
second unwinding operation. Thus, even when the core yarn
C of the spun yarn Y from the package P is exposed by the
yarn guiding operation performed by the suction mouth 28
25 and/or the yarn moving operation performed by the yarn
moving device 34, such a spun yarn Y is sucked into the
suction path of the suction mouth 28.
A length of the spun yarn Y unwound in the second
unwinding operation is longer than or equal to a length of
30 the spun yarn Y from the winding device 13 to the splicer
26. More specifically, the length of the spun yarn Y is
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longer than or equal to a length from a separation point
of the outer peripheral surface of the package P and the
spun yarn Y unwound from the outer peripheral surface to
a point where the splicer head 26a performs the yarn joining
operation. The length of the spun yarn Y can be ch5 anged
by the operator. Specifically, the operator selects
desired conditions with the input key 43 from a plurality
of “times for performing the second unwinding operation”
displayed on the display screen 42. The selected condition
10 is set (stored) in the machine control device 41. For
example, when the operator sets the time for performing the
second unwinding operation to be relatively long, the time
of reversely rotating the package P becomes long, and hence
the length of the spun yarn Y unwound from the package P
15 also becomes long. When the time for performing the second
unwinding operation is set to be relatively short, the time
of reversely rotating the package P becomes short, and hence
the length of the spun yarn Y unwound from the package P
also becomes short. The unit controller 10 rotates the
20 reverse rotation roller 33a at a constant speed regardless
of which condition is selected. However, the rotation
speed of the reverse rotation roller 33a may be differed
according to a diameter of the package P.
Then, as illustrated in FIG. 8, the unit controller
25 10 stops the rotation of the reverse rotation mechanism 33
(time point of T7 of FIG. 3). The reverse rotation of the
package P is thereby stopped. Then, the unit controller
10 stops the suction flow of the suction mouth 28 (time point
of T8 of FIG. 3). Thus, after such a time point, the spun
30 yarn Y from the package P is not sucked into the suction
path of the suction mouth 28.
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Then, the unit controller 10 causes the splicer 26
to perform the yarn joining operation (period from T9 to
T12 of FIG. 3). More specifically, the unit controller 10
first moves the splicer head 26a forward, and thereafter,
operates the yarn gathering lever 26b. Accordingly, 5 , the
spun yarn Y from the pneumatic spinning device 7 and the
spun yarn Y from the package P are gathered to the splicer
head 26a (period from T9 to T10 of FIG. 3). After the
gathering of the spun yarn Y is finished (time point of T10
10 of FIG. 3), the unit controller 10 controls the splicer 26
to cut the two spun yarns Y at a predetermined position and
perform the yarn joining operation of the yarn ends of the
two spun yarns Y with action of the whirling airflow (period
from T10 to T11 of FIG. 3). After the yarn joining operation
15 is finished (time point of T11 of FIG. 3), the unit
controller 10 operates the yarn gathering lever 26b to
release the gathering of the joined spun yarn Y (period from
T11 to T12 of FIG. 3).
After the yarn joining operation of the splicer 26
20 is finished (time point of T12 of FIG. 3), the unit
controller 10 operates the suction pipe 27, the suction
mouth 28, the reverse rotation mechanism 33, and the yarn
moving device 34 so as to return to the original position
in the yarn joining cart 3. The unit controller 10 then
25 swings the cradle arm 21 to the position illustrated in FIG.
2 to bring the package P into contact with the winding drum
22, and restarts the winding by the winding device 13.
As described above, in the spinning machine 1, when
the spun yarn Y is cut, the guiding operation to guide the
30 spun yarn Y from the package P to the splicer 26 is performed
by the suction mouth 28, and the yarn joining operation to
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join the spun yarn Y from the pneumatic spinning device 7
and the spun yarn Y from the package P is performed by the
splicer 26. When a high tension is applied to the spun yarn
Y from the package P during the guiding operation to guide
the spun yarn Y from the package P to the splicer 26, 5 6, the
possibility of the core yarn C being exposed increases. In
the spinning machine 1, however, the second unwinding
operation of reversely rotating the package P and unwinding
the spun yarn Y from the package P is performed by the winding
10 device 13 after the yarn guiding operation is finished and
before the yarn joining operation is started. Furthermore,
the spun yarn Y from the package P is sucked by the suction
mouth 28 while the second unwinding operation is being
performed. Thus, even if the core yarn C is exposed while
15 the yarn guiding operation is being performed, for example,
the portion where the core yarn C is exposed is sucked by
the suction mouth 28. Therefore, the portion where the core
yarn C is exposed can be prevented from being mixed into
the package P.
20 The spinning machine 1 includes the yarn moving
device 34. Thus, the spun yarn Y from the package P can
be moved to the desired position before the yarn joining
operation. More specifically, the yarn moving device 34
moves the spun yarn Y from the package P towards the center
25 of the wound width of the package P. Thus, the yarn joining
operation can be more reliably performed.
The reverse rotation mechanism 33 stops the reverse
rotation of the package P between the first unwinding
operation and the second unwinding operation. The second
30 unwinding operation thus can be performed after resetting
(cancelling) accumulation of a reverse rotation amount of
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the first unwinding operation. Thus, the package P can be
reliably reversely rotated at the desired reverse rotation
amount in the second unwinding operation. Furthermore,
since the reverse rotation of the package P is stopped
during the yarn moving operation, friction on the spun y5 arn
Y from the package P by the yarn moving device 34 can be
reduced.
In the spinning machine 1, the length of the spun yarn
Y unwound by the winding device 13 in the second unwinding
10 operation is longer than or equal to the length of the spun
yarn Y from the winding device 13 to the splicer 26. More
specifically, the length of the spun yarn Y is longer than
or equal to the length from the separation point of the outer
peripheral surface of the package P and the spun yarn Y
15 unwound from the outer peripheral surface to the point where
the splicer head 26a performs the yarn joining operation.
Thus, the portion where the core yarn C may be exposed can
be reliably collected.
The spinning machine 1 includes the machine control
20 device 41 adapted to set the period of time for performing
the second unwinding operation. The length of the spun yarn
Y unwound by the second unwinding operation thus can be
adjusted.
The spinning machine 1 includes the core yarn
25 supplying device 200, the draft device 6, and the pneumatic
spinning device 7, and hence can appropriately form the spun
yarn Y having the core yarn C.
The spinning machine 1 includes the unit controller
10, and thus can reliably perform the second unwinding
30 operation, the operation to cause the suction mouth 28 to
suck the spun yarn Y, and the like.
20 / 31
One embodiment of the present invention has been
described above, but the present invention is not limited
to the above embodiment.
The spinning machine 1 stops the reverse rotation of
the package P between the first unwinding operation and 5 the
second unwinding operation, but the spinning machine 1 may
perform, as a series of unwinding operations, the operation
from the first unwinding operation to the second unwinding
operation without stopping the reverse rotation of the
10 package P.
A splicer 26 using the compressed air is used as the
yarn joining device, but the yarn joining device may be a
knotter that mechanically joins the spun yarn Y, or the like.
In the above-described embodiment, the splicer head 26a can
15 move forward and backward with respect to the yarn path,
but the splicer head 26a may not move forward and backward.
The yarn moving device 34 moves the spun yarn Y towards
the center in the wound width of the package P, but the yarn
moving device 34 may move the spun yarn Y towards a region
20 other than the center according to a yarn joining position
of the splicer 26.
In the spinning machine 1, the splicer 26, the suction
pipe 27, the suction mouth 28, the reverse rotation
mechanism 33, and the yarn moving device 34 are provided
25 in the yarn joining cart 3, but at least one of the sections
may not be provided in the yarn joining cart 3, and may be
directly arranged in each spinning unit 2.
The winding device 13 includes the reverse rotation
mechanism 33, but the winding device 13 may not include the
30 reverse rotation mechanism 33 and may drive the winding drum
22 of each spinning unit 2 independently. Thus, when the
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spun yarn Y of a spinning unit 2 is cut, the spun yarn Y
can be unwound from the package P by reversely rotating the
winding drum 22 of the spinning unit 2. The winding device
13 includes the winding drum 22 and the reverse rotation
mechanism 33, but the winding device 13 may not include 5 de the
winding drum 22 and the reverse rotation mechanism 33, and
a drive mechanism adapted to directly rotate a supporting
body that supports the bobbin B may be arranged in each
winding device. In this case, the driving mechanism
10 forwardly rotates the package P to wind the spun yarn Y into
the package P, and when the spun yarn Y of a spinning unit
2 is cut, the drive mechanism reversely rotates the package
P of the spinning unit 2 to unwind the spun yarn Y.
In the spinning machine 1, a brake mechanism arranged
15 on the cradle arm 21 is used to stop the forward rotation
of the package P, but a package stopping mechanism arranged
in the yarn joining cart 3 may be used. In this case, the
cradle arm 21 is first swung and the package P is moved away
from the winding drum 22 in the spinning unit 2. At this
20 time, the package P continues to forwardly rotate with
inertia. The yarn joining cart 3 then travels to the
relevant spinning unit 2 and stops. The yarn joining cart
3 swings the package stopping mechanism so as to bring the
package stopping mechanism into contact with the package
25 P, and stops the forward rotation of the package P.
In the spinning machine 1, the unit controller 10
performs the control of the yarn joining cart 3, but a cart
controller (control section) arranged separately from the
unit controller 10 may perform the control of the yarn
30 joining cart 3. In this case, a yarn joining request signal
is first transmitted to the machine control device 41, which
22 / 31
is a high order controller, from the unit controller 10.
The machine control device 41 that received the yarn joining
request signal instructs the cart controller to perform the
yarn joining operation in the spinning unit 2 including the
unit controller 10 that transmitted the yarn jo5 ining
request signal. The cart controller thus controls the
suction pipe 27, the suction mouth 28, the splicer 26, and
the like so as to perform the yarn joining operation in the
spinning unit 2.
10 In the above-described embodiment, the spinning
machine 1, which is a yarn winding machine of one embodiment
of the present invention, has been described, but the
present invention may be applied to other yarn winding
machines. For example, the present invention may be
15 applied to an automatic winder configured by arranging a
plurality of winding units side by side. The plurality of
winding units wind the spun yarn unwound from a yarn
supplying bobbin while traversing the spun yarn to form a
package.
20 The pneumatic spinning device 7 may further include
a needle held by the fiber guiding section and arranged so
as to protrude into the spinning chamber to prevent twists
of the fiber bundle F from being propagated to upstream of
the pneumatic spinning device 7. Alternatively, such a
25 needle may be omitted, and the pneumatic spinning device
7 may prevent the twists of the fiber bundle F from being
propagated to upstream of the pneumatic spinning device 7
by a downstream end portion of the fiber guiding section.
Furthermore, instead of the above-described configuration,
30 the pneumatic spinning device 7 may include a pair of
air-jet nozzles respectively adapted to twist the fiber
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bundle F in directions opposite from each other.
In the spinning unit 2, the yarn storage device 11
has a function of pulling out the spun yarn Y from the
pneumatic spinning device 7, but the spun yarn Y may be
pulled out from the pneumatic spinning device 7 with 5 a
delivery roller and a nip roller. In a case of pulling out
the spun yarn Y from the pneumatic spinning device 7 with
the delivery roller and the nip roller, a slack tube adapted
to absorb the slack of the spun yarn Y with suction airflow,
10 a mechanic compensator, or the like may be provided instead
of the yarn storage device 11.
In the spinning machine 1, each device is arranged
such that the spun yarn Y supplied at an upper side is wound
at a lower side in a direction of a machine height. However,
15 each device may be arranged such that the spun yarn Y
supplied at the lower side is wound at the upper side.
In the spinning machine 1, at least one of the bottom
rollers in the draft device 6, and the traverse guide 23
are driven by power from the second end frame 5 (that is,
20 in common with the plurality of spinning units 2). However,
each section (for example, the draft device 6, the pneumatic
spinning device 7, the winding device 13, or the like) of
the spinning unit 2 may be driven independently for each
spinning unit 2.
25 In the travelling direction of the spun yarn Y, the
tension sensor 9 may be arranged upstream of the yarn
monitoring device 8. The unit controller 10 may be provided
for every spinning unit 2. In the spinning unit 2, the
waxing device 12, the tension sensor 9, and the yarn
30 monitoring device 8 may be omitted.
FIG. 1 illustrates that the spinning machine 1 winds
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a cheese package P, but the spinning machine 1 can also wind
a conical package P. In a case of the conical package P,
a slack of the spun yarn Y occurs by traversing the spun
yarn Y, but the slack can be absorbed with the yarn storage
5 device 11.
A yarn winding machine of the present invention
includes a yarn supplying device adapted to supply a yarn
having a core yarn; a winding device adapted to wind the
yarn into a package by forwardly rotating the package; a
10 yarn joining device adapted to perform a yarn joining
operation to join the yarn from the yarn supplying device
and the yarn from the package upon disconnection of the
yarn; and a yarn guiding device adapted to perform a yarn
guiding operation to guide the yarn from the package to the
15 yarn joining device while sucking the yarn from the package
upon disconnection of the yarn; wherein the winding device
is adapted to perform a first unwinding operation to unwind
the yarn from the package by reversely rotating the package
when the yarn guiding device is performing the yarn guiding
20 operation, and to perform a second unwinding operation to
unwind the yarn from the package by reversely rotating the
package after the yarn guiding device finishes the yarn
guiding operation and before the yarn joining device starts
the yarn joining operation, and the yarn guiding device is
25 adapted to suck the yarn from the package when the winding
device is performing the second unwinding operation.
In the above-described yarn winding machine, when the
yarn is disconnected, the guiding operation is performed
by the yarn guiding device, and thereafter the yarn joining
30 operation is performed by the yarn joining device. If high
tension is applied on the yarn from the package when the
25 / 31
guiding operation is being performed, possibility of the
core yarn being exposed from a surface of the yarn may
increase. However, in the above-described yarn winding
machine, the second unwinding operation is performed by the
winding device after the yarn guiding operation is 5 finished
and before the yarn joining operation is started.
Furthermore, the yarn from the package is sucked by the yarn
guiding device when the second unwinding operation is being
performed. Thus, even if the core yarn is exposed when the
10 yarn guiding operation is being performed, for example, the
portion where the core yarn is exposed is sucked by the yarn
guiding device. Therefore, the portion where the core yarn
is exposed can be prevented from being mixed into the
package.
15 An embodiment of the yarn winding machine of the
present invention may further include a yarn moving device
adapted to perform a yarn moving operation to move the yarn
from the package after the yarn guiding device finishes the
yarn guiding operation and before the winding device starts
20 the second unwinding operation. Thus, the yarn from the
package can be moved to a desired position before the yarn
joining operation, and the yarn joining operation can be
more reliably performed.
In an embodiment of the yarn winding machine of the
25 present invention, the yarn moving device may be adapted
to move the yarn from the package towards center of a wound
width of the package by the yarn moving operation. Thus,
the yarn joining operation can be more reliably performed.
In an embodiment of the yarn winding machine of the
30 present invention, the winding device may be adapted to stop
reverse rotation of the package between the first unwinding
26 / 31
operation and the second unwinding operation. Thus, the
package can be reliably reversely rotated by the desired
reverse rotation amount in the second unwinding operation.
In an embodiment of the yarn winding machine of the
present invention, a length of the yarn unwound 5 by the
winding device by the second unwinding operation may be
equal to or longer than a length of the yarn from the winding
device to the yarn joining device. Thus, the portion where
the core yarn may be exposed can be reliably collected.
10 An embodiment of the yarn winding machine of the
present invention may further include a setting section
adapted to set a period of time in which the winding device
performs the second unwinding operation. Thus, the length
of the yarn unwound by the second unwinding operation can
15 be adjusted.
In an embodiment of the yarn winding machine of the
present invention, the yarn joining device includes a yarn
joining section adapted to join the yarn from the yarn
supplying device and the yarn from the package, and a yarn
20 gathering section adapted to gather the yarn from the yarn
supplying device and the yarn from the package, and the
winding device is adapted to perform the second unwinding
operation after the yarn guiding device finishes the yarn
guiding operation and before the yarn gathering section
25 gathers the yarn from the yarn supplying device and the yarn
from the package to the yarn joining section. Thus, the
yarns can be joined in a state where the portion where the
core yarn is exposed is removed.
In an embodiment of the yarn winding machine of the
30 present invention, the yarn supplying device may include
a core yarn supplying device adapted to supply the core
27 / 31
yarn; a draft device adapted to draft a fiber bundle; and
a pneumatic spinning device adapted to form the yarn by
applying twists to the fiber bundle with the core yarn as
a core. Thus, the yarn having the core yarn can be
5 appropriately formed.
An embodiment of the yarn winding machine of the
present invention may further include a control section
adapted to control the winding device to perform the second
unwinding operation and the yarn guiding device to suck the
10 yarn from the package while the second unwinding operation
is being performed by the winding device. Thus, the second
unwinding operation, the operation of causing the yarn
guiding device to suck the yarn, and the like can be reliably
performed.

WE CLAIM:
1. A yarn winding machine comprising:
a yarn supplying device adapted to supply a yarn
having a core yarn;
a winding device adapted to wind the yarn into 5 a
package by forwardly rotating the package;
a yarn joining device adapted to perform a yarn
joining operation to join the yarn from the yarn supplying
device and the yarn from the package upon disconnection of
10 the yarn;
a yarn guiding device adapted to perform a yarn
guiding operation to guide the yarn from the package to the
yarn joining device while sucking the yarn from the package
upon disconnection of the yarn;
15 wherein the winding device is adapted to perform a
first unwinding operation to unwind the yarn from the
package by reversely rotating the package when the yarn
guiding device is performing the yarn guiding operation,
and to perform a second unwinding operation to unwind the
20 yarn from the package by reversely rotating the package
after the yarn guiding device finishes the yarn guiding
operation and before the yarn joining device starts the yarn
joining operation, and
the yarn guiding device is adapted to suck the yarn
25 from the package when the winding device is performing the
second unwinding operation.
2. The yarn winding machine according to claim 1,
further comprising a yarn moving device adapted to perform
30 a yarn moving operation to move the yarn from the package
after the yarn guiding device finishes the yarn guiding
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operation and before the winding device starts the second
unwinding operation.
3. The yarn winding machine according to claim 2,
wherein the yarn moving device is adapted to move the 5 he yarn
from the package towards center of a wound width of the
package by the yarn moving operation.
4. The yarn winding machine according to any one of
10 claim 1 through claim 3, wherein the winding device is
adapted to stop reverse rotation of the package between the
first unwinding operation and the second unwinding
operation.
15 5. The yarn winding machine according to any one of
claim 1 through claim 4, wherein a length of the yarn unwound
by the winding device by the second unwinding operation is
equal to or longer than a length of the yarn from the winding
device to the yarn joining device.
20
6. The yarn winding machine according to any one of
claim 1 through claim 5, further comprising a setting
section adapted to set a period of time in which the winding
device performs the second unwinding operation.
25
7. The yarn winding machine according to any one of
claim 1 through claim 6, wherein the yarn joining device
includes a yarn joining section adapted to join the yarn
from the yarn supplying device and the yarn from the
30 package, and a yarn gathering section adapted to gather the
yarn from the yarn supplying device and the yarn from the
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package, and
the winding device is adapted to perform the second
unwinding operation after the yarn guiding device finishes
the yarn guiding operation and before the yarn gathering
section gathers the yarn from the yarn supplying device 5 and
the yarn from the package to the yarn joining section.
8. The yarn winding machine according to any one of
claim 1 through claim 7, wherein the yarn supplying device
10 includes:
a core yarn supplying device adapted to supply the
core yarn;
a draft device adapted to draft a fiber bundle; and
a pneumatic spinning device adapted to form the yarn
15 by applying twists to the fiber bundle with the core yarn
as a core.
9. The yarn winding machine according to any one of
claim 1 through claim 8, further comprising a control
20 section adapted to control the winding device to perform
the second unwinding operation and the yarn guiding device
to suck the yarn from the package while the second unwinding
operation is being performed by the winding device.
25 10. The yarn winding machine according to any one
of claim 1 through claim 9, wherein the yarn guiding device
is adapted to suck and remove a defective portion of the
yarn during the second unwinding operation.