[0005]
FP16-0410-00IN-MRT
FIG. 1 is a front view of a spinning machine according
to an embodiment.
FIG. 2 is a side view of a spinning unit of the spinning machine
of FIG. 1.
FIG. 3 is a block diagram illustrating the configuration of a
part of the spinning unit.
FIG. 4 is a perspective view of a core yarn supply device in
the spinning unit illustrated in FIG. 2.
FIG. SA is a side view of a tension adding mechanism in the core
10 yarn supply device illustrated in FIG. 4.
FIG. SB is another side view of the tension adding mechanism
in the core yarn supply device illustrated in FIG. 4.
FIG. 6 is a block diagram illustrating the configuration of a
part of a spinning unit of a spinning machine according to another
15 embodiment.
20
DETAILED DESCRIPTION
[0006] An embodiment will now be described with reference to the
drawings. In the drawings, like numerals indicate like components,
and overlapping description will be omitted.
[0007] As illustrated in FIG. 1, a spinning machine 1 includes
a plurality of spinning units 2, a splicing carrier 3, a doffing
carrier (not illustrated), a first end frame 4, and a second end frame
5. The spinning units 2 are aligned in a row. Each spinning unit
2 generates yarn Y and winds the yarn into a package P. When the yarn
25 Y is cut or breaks in a spinning unit 2 for any reason, the splicing
carrier 3 splices the yarn Y in the spinning unit 2. When the package
P becomes a full roll, completes in a spinning unit 2, the doffing
carrier doffs the package P and supplies a new bobbin B to the spinning
unit 2.
30 [0008] The first end frame 4 accommodates therein a collection
device and the like for collecting fiber waste, yarn waste, and others
generated in the spinning unit 2. The second end frame 5 accommodates
therein an air supply unit adjusting air pressure of compressed air
(air) supplied to the spinning machine 1 and supplying air to the
35 units in the spinning machine 1, a driving motor for supplying power
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to the units in the spinning unit 2, and others. The second end frame
5 includes a machine control device 100, a display screen 102, and
an input key 104. The machine control device 100 intensively manages
and controls the units of the spinning machine 1. The display screen
5 102 can display, for example, information on the settings and/or the
status of the spinning unit 2. An operator performs necessary
operations through the input key 104, thereby setting the spinning
unit 2.
[0009] As FIGs. 1 and 2 illustrate, each spinning unit 2 includes,
10 in the order from the upstream side in the direction in which the
yarn Y travels, a drafting device 6, a core yarn supply device 7,
an air spinning device 8, a yarn monitoring device 9, a tension sensor
(a tension detecting unit) 10, a yarn storage device 11, a waxing
device 12, and a winding device 13. In the embodiment, the drafting
15 device 6, the core yarn supply device 7, and a yarn storage roller
lla (described later) of the yarn storage device 11 constitute a yarn
forming unit forming the yarn Y from a spun material while adjusting
the tension of the spun material. The drafting device 6, the core
yarn supply device 7, and the yarn storage roller lla of the yarn
20 storage device 11 are disposed in at least one of the upstream side
and the downstream side from a position (the air spinning device 8)
at which the spun yarn is twisted. A unit controller (the control
unit) 15 is provided in every certain number of spinning units 2 and
controls operations of the spinning units 2. The drafting device 6,
25 the core yarn supply device 7, and the yarn storage device 11 in the
spinning unit 2 are devices affecting the tension of the yarn Y.
[0010] The drafting device 6 drafts a sliver (a fiber bundle,
a spun material) S. The drafting device 6 includes, in the order from
the upstream side in the direction in which the sliver S travels,
30 a pair of back rollers 16, a pair of third rollers 17, a pair of middle
rollers 18, and a pair of front rollers 19. The pair of front rollers
19 are disposed in the most downstream position in a direction of
drafting. Each pair of rollers 16, 17, 18, and 19 includes a bottom
roller and a top roller. The bottom roller is driven and rotated by
35 a driving motor installed in the second end frame 5. The top roller
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of the pair of middle rollers 18 includes an apron belt 18 a. The bottom
roller of the pair of middle rollers 18 includes an apron belt lBb.
[0011] The core yarn supply device 7 unwinds core yarn (a spun
material) C from a core yarn package CP and supplies the core yarn
5 C to the drafting device 6. Specifically, the core yarn supply device
7 supplies the core yarn C onto the traveling path of the fiber bundle
F from between the pair of middle rollers 18 and the pair of front
rollers 19, whereby the core yarn C is supplied to the air spinning
device 8 together with the fiber bundle F.
10 [ 0 012 J The air spinning device 8 generates the yarn Y by twisting
the fiber bundle F drafted by the drafting device 6 using swirling
airflow. More specifically (although not illustrated in the
drawings) , the air spinning device 8 includes a spinning room, a fiber
guiding unit, a swirling airflow generating nozzle, and a hollow guide
15 shaft. The fiber guiding unit guides the fiber bundle F supplied from
the drafting device 6 disposed in the upstream side to the spinning
room. The swirling airflow generating nozzle is disposed around a
path on which the fiber bundle F travels. Swirling airflow is
generated in the spinning room with the swirling airflow generating
20 nozzle spraying air. The swirling airflow reverses and swirls the
fiber tips of a plurality of fibers included in the fiber bundle F.
The hollow guide shaft guides the yarn Y from the spinning room to
the outside of the air spinning device B.
[0013] The yarn monitoring device 9 is disposed between the air
25 spinning device 8 and the yarn storage device 11 and monitors
information on traveling yarn Y. Specifically, the yarn monitoring
device 9 detects whether the yarn Y has any defects based on the
monitored information. Upon detection of a defect on the yarn, the
yarn monitoring device 9 transmits a yarn defect detection signal
30 to the unit controller 15. The yarn monitoring device 9 detects
abnormality in the diameter of the yarn Y, a foreign matter contained
in the yarn Y, and/or the like as a defect of the yarn Y. The yarn
monitoring device 9 further detects yarn breakage and others.
[0014] The tension sensor 10 disposed between the air spinning
35 device 8 and the yarn storage device 11 measures the tension of
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traveling yarn Y and transmits a tension measuring signal (a result
of detection) to the unit controller 15. When the unit controller
15 determines that abnormality has occurred based on at least one
of a result of detection by the yarn monitoring device 9 and a result
5 of detection by the tension sensor 10, the yarn Y is cut in the spinning
unit 2. Specifically, air supply to the air spinning device 8 stops,
generation of the yarn Y is terminated, and the yarn Y is accordingly
cut. In another way, the yarn Y may be cut with a cutter separately
provided.
10 [0015] The waxing device 12 disposed between the yarn storage
device 11 and the winding device 13 applies wax to the yarn Y.
[0016] The yarn storage device 11 disposed between the air
spinning device 8 and the winding device 13 eliminates slack from
the yarn Y. The yarn storage device 11 has functions of stably drawing
15 the yarn Y from the air spinning device 8, preventing the yarn Y from
slacking by retaining the yarn Y delivered from the air spinning device
8, for example, in the yarn splicing operation of the splicing carrier
3, and preventing fluctuations in the tension of the yarn Y situated
downstream of the yarn storage device 11 from spreading to the air
20 spinning device 8.
[0017] The yarn storage device 11 includes the yarn storage
roller 11a, a yarn threading member 11b, and a motor 11c. The yarn
storage roller 11a stores the yarn Y with the yarn Y wound onto the
outer peripheral surface of the yarn storage roller 11a. The yarn
25 threading member 11b is disposed at the downstream end of the yarn
storage roller 11a. Upon a start of storage of the yarn Y, the yarn
threading member 11b hooks the yarn Y and winds the yarn onto the
yarn storage roller 11a. During winding into the package P, the yarn
threading member llb adds tension to the yarn Y unwound from the yarn
30 storage roller 11a. The motor 11c rotates the yarn storage roller
11a. As illustrated in FIG. 3, a motor driver 11d controls driving
of the motor 11c. Specifically, the motor driver lld controls driving
of the motor 11c based on a signal output from the unit controller
35
15.
[0018] The winding device 13 winds the yarn Y onto the bobbin
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B and forms the package P. The winding device 13 includes a cradle
arm 21, a winding drum 22, and a traverse guide 23. The cradle arm
21 rotatably supports the bobbin B. The cradle arm 21 is swingably
supported by a supporting shaft 24 and has the surface of the bobbin
5 B or the surface of the package P contact with the surface of the
winding drum 22 at appropriate pressure. The driving motor (not
illustrated) installed in the second end frame 5 simultaneously drives
the winding drums 22 of a plurality of spinning units 2. With this
drive, the bobbin B or the package P of each spinning unit 2 is rotated
10 in a direction of winding. The traverse guide 23 of each spinning
unit 2 is mounted on a shaft 25 shared by a plurality of spinning
units 2. With the driving motor in the second end frame 5 driving
the shaft 25 in a direction of the rotational axis of the winding
drum 22 in a reciprocating manner, the traverse guide 23 has the yarn
15 Y traverse a rotating bobbin B or package P at a certain width.
[0019] When the yarn Y is cut or breaks in a spinning unit 2 for
any reason, the splicing carrier 3 runs to the spinning unit 2 and
performs a splicing operation. The splicing carrier 3 includes a
splicing device 26, a suction pipe 27, and a suction mouth 28. The
20 suction pipe 27 is rotatably supported by a support shaft 31. The
suction pipe 27 catches the yarn Y sent from the air spinning device
8 and guides the yarn Y to the splicing device 2 6. The suction mouth
28 is rotatably supported by a support shaft 32. The suction mouth
28 catches the yarn Y sent from the winding device 13 and guides the
25 yarn Y to the splicing device 2 6. The splicing device 2 6 splices the
guided pieces of the yarn Y with each other. Examples of the splicing
device 26 include a splicer using compressed air and a knotter
mechanically splicing the yarn Y.
[0020] In the splicing operation, the splicing carrier 3 rotates
30 (reversely rotates) the package P in a reverse direction of winding.
35
Specifically, the cradle arm 21 is moved by an air cylinder (not
illustrated) so that the package P is separated from the winding drum
22, and a reverse rotating roller (not illustrated) installed to the
splicing carrier 3 reversely rotates the package P.
[0021] The core yarn supply device 7 will now be described in
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FP16-0410-00IN-MRT
detail. As illustrated in FIG. 2, the core yarn supply device 7
includes a package supporting unit (a supporting unit) 50, a core
yarn supply unit 51, and a core yarn guiding unit 52.
[0022] The package supporting unit 50 supports the core yarn
5 package CP with the center line of the core yarn package CP
horizontally extending in the front-to-back direction. The core yarn
package CP is formed with the core yarn C wound onto a core yarn bobbin
CB. The core yarn C in this embodiment is, for example, multifilament
yarn. The multifilament yarn is yarn formed by bundling a plurality
10 of pieces of filament single yarn. The core yarn C is unwound from
the core yarn package CP and is supplied to the core yarn supply unit
51 via a guide roller 53 guiding the core yarn C. The core yarn C
may be another kind of yarn such as monofilament yarn and spun yarn.
[0023] The core yarn supply unit 51 has functions of adding
15 tension to supplied core yarn C, adding slack to the core yarn C,
and delivering the core yarn C (an end of the core yarn C). The core
yarn guiding unit 52 is a cylindrical member guiding the core yarn
C to the drafting device 6.
[0024] As illustrated in FIG. 4, the core yarn supply unit 51
20 includes a unit base 60, a tension adding mechanism 70, a slack adding
mechanism 80, a core yarn monitoring device 82, and a core yarn
deli very mechanism 8 4. In the following description, in the
traveling path of the core yarn C in the core yarn supply unit 51,
the core yarn package CP side is referred to as an upstream side,
25 whereas the core yarn guiding unit 52 side is referred to as a
downstream side.
[0025] The unit base 60 supports, in the order from the upstream
side in a direction in which the core yarn C is supplied, the tension
adding mechanism 70, the slack adding mechanism 80, the core yarn
30 monitoring device 82, and the core yarn delivery mechanism 84. A core
yarn guide 61 guiding the core yarn C is disposed in the most upstream
position on the unit base 60.
[0026] The tension adding mechanism 70 adds tension to the core
yarn C in the downstream side from the core yarn guide 61. As
35 illustrated in FIGs. SA and 5B, the tension adding mechanism 70
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includes a tension adding unit 71 and a retaining unit 72.
[0027] The tension adding unit 71 includes a fixed piece 73 and
a movable piece 74. With the core yarn C alternately hooked to the
fixed piece 73 and the movable piece 74, the core yarn C is bent a
5 plurality of times in the tension adding unit 71. The number of bends
of the core yarn C is, for example, 20 times or less (preferably,
between twice and ten times, inclusively).
[0028] The fixed piece 73 is fixed to the unit base 60. The
movable piece 74 is supported by a support shaft (not illustrated)
10 provided to the fixed piece 7 3 and openable and closable (rota table)
with respect to the fixed piece 7 3. The movable piece 7 4 is pressed
toward a direction opening with respect to the fixed piece 73 by a
spring (not illustrated) provided to the fixed piece 73.
[0029] A plurality of shafts 73a are provided to the fixed piece
15 73 at certain intervals in a direction in which the core yarn C is
supplied. A plurality of projections 7 4a projecting toward the fixed
piece 7 3 are provided to the movable piece 7 4. When the movable piece
74 closes with respect to the fixed piece 73 (the state in FIG. 5B),
the projections 74a are alternately positioned between the shafts
20 73a in the direction in which the core yarn C is supplied. Each
projection 74a has a hole 74b through which the core yarn C passes
at its leading end. The core yarn Cis alternately hooked to the shafts
73a and the holes 74b.
[0030] As illustrated in FIG. SA, the core yarn C is bent a
25 plurality of times when the movable piece 74 opens with respect to
the fixed piece 73. In this process, tension is added to the core
yarn C. Specifically, higher tension is added to the core yarn C with
the movable piece 74 opening with respect to the fixed piece 73 at
a larger angle, and the state of the tension adding unit 71 under
30 this condition is referred to as a tension added state. As illustrated
in FIG. 5B, the core yarn C is substantially linear when the movable
piece 7 4 closes with respect to the fixed piece 7 3. In this process,
no tension is added to the core yarn C (or lower tension than the
tension in the tension added state is added to the core yarn C) . The
35 state of the tension adding unit 71 under this condition is referred
s I 30
FP16-0410-00IN-MRT
to as a no-tension added state.
[0031] The retaining unit 72 opens and closes the movable piece
74 with respect to the fixed piece 73. As illustrated in FIGs. SA
and 5B, the retaining unit 72 includes a retaining member 75 and an
5 actuator 7 6. As illustrated in FIG. 3, the unit controller 15 controls
driving of the actuator 76.
[0032] The actuator 76 has the retaining member 75 abut with or
separated from the movable piece 7 4. More specifically, the
retaining member 75 has a front end 75a abutting with the movable
10 piece 74 from the opposite side of the fixed piece 73, and the position
of the front end 75a is moved by the actuator 76.
[0033] When the front end 75a moves down, the movable piece 74
is pushed by the front end 75a and closes with respect to the fixed
piece 73. This process turns the tension adding unit 71 to the
15 no-tension added state. When the front end 75a moves up, the movable
piece 74 opens with respect to the fixed piece 73 with the pressing
force of the spring. This process turns the tension adding unit 71
to the tension added state.
[0034] The slack adding mechanism 80 adds slack to the core yarn
20 C in the downstream side from the tension adding mechanism 7 0. More
specifically, the position of a front-end guiding unit of the slack
adding mechanism 80 moves from a position including the traveling
path (the continuous line in FIG. 4) of the core yarn C to another
position (the position indicated by the double chain line in FIG.
25 4) away from the traveling path of the core yarn C before the core
yarn delivery mechanism 84 starts delivering the core yarn C. This
process adds slack to the core yarn C. The core yarn moni taring device
82 detects the presence of the core yarn C between the core yarn guide
61 and the core yarn deli very mechanism 84. In FIG. 4, the core yarn
30 monitoring device 82 is disposed downstream of the slack adding
mechanism 80 in the direction in which the core yarn C is supplied.
The core yarn monitoring device 82 may be disposed upstream of the
tension adding mechanism 70. The core yarn deli very mechanism 8 4 is
disposed downstream of the core yarn monitoring device 82 and delivers
35 the core yarn C (an end of the core yarn C) to the drafting device
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FP16-041 0-00IN-MRT
6 when the spinning operation starts.
[0035] A method of controlling the tension of the yarn Y with
the yarn storage device 11 will now be described.
[0036] When the spinning unit 2 of the spinning machine 1 starts
5 the spinning operation, the tension sensor 10 measures the tension
of traveling yarn Y and transmits a tension measuring signal to the
unit controller 15. The unit controller 15 rotates the yarn storage
roller lla at the number of initial rotations set for each lot. The
number of initial rotations is preset such that the tension of the
10 yarn Y detected by the tension sensor 10 falls within a predetermined
range. The "predetermined range" may be a range having a certain width
or may be a value without a range.
[0037] The unit controller 15 receives the tension measuring
signal and determines whether the tension of the yarn Y indicated
15 by the tension measuring signal falls within a predetermined range.
20
The range for the tension of the yarn Y is input, for example, through
the input key 104 of the machine control device 100 and set. The range
for the tension of the yarn Y may be automatically set based on a
set lot.
[0038] If the unit controller 15 determines that the tension of
the yarn Y is out of the predetermined range, the unit controller
15 controls the number of rotations per unit time (hereinafter simply
referred to as "the number of rotations") of the yarn storage roller
lla. In this embodiment, the unit controller 15 controls the tension
25 of the yarn Y by changing the number of rotations of the yarn storage
roller lla without changing the drafting speed (for example, the
circumferential speed of the pair of front rollers 19) of the drafting
device 6. The drafting operation by the drafting device 6, the
spinning operation by the air spinning device 8, and the winding
30 operation by the winding device 13 are continuing in parallel with
the control.
[0039] Specifically, if the tension of the yarn Y is below the
predetermined range, the unit controller 15 increases the number of
rotations (rpm) of the yarn storage roller lla from the number of
35 initial rotations. More specifically, the unit controller 15 outputs
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FP16-041 0-00IN-MRT
a signal to the motor driver lld and increases the number of rotations
of the motor llc. This process changes the feed ratio (the difference
in the delivery speed of the yarn Y between the yarn storage roller
lla and the pair of front rollers 19) of the yarn Y determined based
5 on the number of rotations of the yarn storage roller lla and the
circumferential speed of the pair of front rollers 19. Specifically,
the delivery speed of the yarn Y drawn from the air spinning device
8 by the yarn storage roller lla becomes higher than the delivery
speed of the yarn Y delivered from the pair of front rollers 19 to
10 the air spinning device 8. The tension of the yarn Y increases with
the change in the feed ratio. When the unit controller 15 determines
that the tension of the yarn Y has increased to the predetermined
range based on the tension measuring signal, the unit controller 15
completes the control of increasing the number of rotations of the
15 yarn storage roller lla and controls the number of rotations of the
yarn storage roller lla so that the tension of the yarn Y is maintained
within the predetermined range.
[0040] On the contrary, if the tension of the yarn Y is beyond
the predetermined range, the unit controller 15 decreases the number
20 of rotations of the yarn storage roller lla from the number of initial
rotations. With this operation, the deli very speed of the yarn Y drawn
from the air spinning device 8 by the yarn storage roller lla becomes
lower than the delivery speed of the yarn Y delivered from the pair
of front rollers 19 to the air spinning device 8, which accordingly
25 changes the feed ratio of the yarn Y. The tension of the yarn Y
decreases with the change in the feed ratio. When the unit controller
15 determines that the tension of the yarn Y has decreased to the
predetermined range based on the tension measuring signal, the unit
controller 15 completes the control of decreasing the number of
30 rotations of the yarn storage roller lla and controls the number of
rotations of the yarn storage roller lla so that the tension of the
yarn Y is maintained within the predetermined range.
[0041] If the unit controller 15 determines that the tension of
the yarn Y is out of the predetermined range and further determines
35 that the tension of the yarn Y is at a value causing abnormality on
11 I 30
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the yarn Y (for example, the tension at the value is low enough to
form a weak portion on the yarn Y), the unit controller 15 terminates
the spinning operation instead of controlling the number of rotations
of the yarn storage roller lla.
[0042] A method of controlling the tension of the yarn Y with
the core yarn supply device 7 will now be described.
[0043] When the spinning unit 2 of the spinning machine 1 starts
the spinning operation, the tension sensor 10 measures the tension
of traveling yarn Y and transmits a tension measuring signal to the
10 unit controller 15. The unit controller 15 controls the actuator 76
such that the initial tension is added to the core yarn C by the tension
adding mechanism 70. The initial tension is preset such that the
tension of the yarn Y detected by the tension sensor 10 falls within
a predetermined range. The unit controller 15 controls the actuator
15 76 so as to have the front end 75a positioned at the initial position.
With this process, the initial tension is added to the core yarn C.
[0044] The unit controller 15 receives the tension measuring
signal and determines whether the tension of the yarn Y indicated
by the tension measuring signal falls within a predetermined range.
20 If the unit controller 15 determines that the tension of the yarn
Y is out of the predetermined range, the unit controller 15 controls
the tension added to the core yarn C by the tension adding mechanism
7 0. Specifically, if the tension of the yarn Y is below the
predetermined range, the unit controller 15 controls the actuator
25 76 such that the front end 75a moves above the initial position and
that the movable piece 74 opens with respect to the fixed piece 73.
The tension added to the core yarn C increases with the move of the
front end 7 Sa. When the unit controller 15 determines that the tension
of the yarn Y has increased to the predetermined range based on the
30 tension measuring signal, the unit controller 15 completes the control
of increasing the tension added by the tension adding mechanism 70
and controls the tension adding mechanism 70 such that the tension
of the yarn Y is maintained within the predetermined range.
[0045] If the tension of the yarn Y is beyond the predetermined
35 range, the unit controller 15 controls the actuator 76 such that the
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front end 75a moves below the initial position and that the movable
piece 7 4 closes with respect to the fixed piece 7 3. The tension added
to the core yarn C decreases with the move of the front end 7 5a. When
the unit controller 15 determines that the tension of the yarn Y has
5 decreased to the predetermined range based on the tension measuring
signal, the unit controller 15 completes the control of decreasing
the tension added by the tension adding mechanism 70 and controls
the tension adding mechanism 70 such that the tension of the yarn
Y is maintained within the predetermined range.
10
15
[0046] If the unit controller 15 determines that the tension of
the yarn Y is out of the predetermined range and further determines
that the tension of the yarn Y is at a value causing abnormality on
the yarn Y, the unit controller 15 terminates the spinning operation
instead of controlling the tension adding mechanism 70.
[0047] The tension of the yarn Y may be controlled by controlling
at least one of the yarn storage device 11 and the core yarn supply
device 7. In other words, the tension of the yarn Y may be controlled
by controlling the number of rotations of the yarn storage roller
lla or may be controlled by controlling the tension added to the core
20 yarn C by the tension adding mechanism 7 0. In another way, the tension
of the yarn Y may be controlled by controlling both the yarn storage
roller lla and the tension adding mechanism 70 of the core yarn supply
device 7. In any of these cases, the drafting operation by the
drafting device 6, the spinning operation by the air spinning device
25 8, and the winding operation by the winding device 13 are continuing
in parallel with the control.
[0048] As described above, in the spinning machine 1 according
to the embodiment, devices affecting the tension of the yarn Y are
controlled based on a result of detection by the tension sensor 10
30 such that the tension of the yarn Y falls within a predetermined range.
The spinning machine 1 can maintain the tension of the yarn Y within
a predetermined range by providing feedback control to the devices
based on the tension of the yarn Y detected by the tension sensor
10. The spinning machine 1 in this configuration can thus improve
35 the quality of the yarn Y.
13 I 30
[0049]
FP16-0410-00IN-MRT
In this embodiment, the unit controller 15 controls the
number of rotations of the yarn storage roller 11a based on the tension
measuring signal transmitted from the tension sensor 10 such that
the tension of the yarn Y detected by the tension sensor 10 falls
5 within a predetermined range. A change in the number of rotations
per unit time of the yarn storage roller 11a changes the feed ratio.
The change in the feed ratio accordingly changes the tension of the
yarn Y stored in the yarn storage roller 11a. Consequently, in the
spinning machine 1, the tens ion of the yarn Y is effectively controlled
10 by controlling the number of rotations of the yarn storage roller
11a based on the tension measuring signal transmitted from the tension
sensor 10.
[0050] Specifically, if the tension of the yarn Y is detected
below a predetermined range in the tension measuring signal, the unit
15 controller 15 increases the number of rotations per unit time of the
yarn storage roller 11a until the tension of the yarn Y increases
to the predetermined range. On the contrary, if the tension of the
yarn Y is detected beyond the predetermined range in the tension
measuring signal, the unit controller 15 decreases the number of
20 rotations per unit time of the yarn storage roller lla until the
tension of the yarn Y decreases to the predetermined range. An
increase in the number of rotations of the yarn storage roller 11a
can increase the tension of the yarn Y, whereas a decrease in the
number of rotations of the yarn storage roller lla can decrease the
25 tension of the yarn Y. Consequently, the unit controller 15 controls
the number of rotations of the yarn storage roller 11a based on the
tension measuring signal, thereby maintaining the tension of the yarn
Y within the predetermined range.
[0051] In this embodiment, the yarn storage roller 11a stores
30 the yarn Y while drawing the yarn Y generated by the air spinning
device 8, which means that no delivery rollers or nip rollers for
drawing the yarn Y from the air spinning device 8 are disposed between
the air spinning device 8 and the yarn storage roller 11a. This
configuration enables control of the tension of the yarn Y generated
35 by the air spinning device 8 using the yarn storage roller 11a.
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Consequently, the yarn Y is generated by the air spinning device 8
at optimum spinning tension, which can improve the quality of the
yarn.
[0052] With the configuration that the yarn Y is drawn from the
5 air spinning device 8 by the deli very roller and the nip roller, the
yarn Y may slip on the deli very roller. Slip of the yarn Y may result
in instable control on the tension of the yarn Y. In this embodiment,
the yarn Y is drawn from the air spinning device 8 by the yarn storage
roller 11a. The yarn storage roller 11a draws the yarn Y from the
10 air spinning device 8 by winding the yarn Y onto the outer peripheral
surface of the yarn storage roller 11a. This configuration enables
more accurate control on the tension of the yarn Y. Consequently,
the yarn Y is generated by the air spinning device 8 at optimum spinning
tension, which can improve the quality of the yarn.
15 [0053] In this embodiment, the spinning machine 1 includes the
core yarn supply device 7 having the package supporting unit 50
supporting the core yarn package CP with the core yarn C wound thereon
and the tension adding mechanism 70 adding tension to the core yarn
C unwound from the core yarn package CP. The unit controller 15
20 controls the tension sensor 10 based on the tension measuring signal
transmitted from the tension sensor 10 such that the tension of the
yarn Y detected in the tension adding mechanism 70 falls within a
predetermined range. This configuration can improve the quality of
the yarn Y wound by the winding device 13.
25 [0054] Another embodiment will now be described. In the
spinning machine 1 according to another embodiment, as illustrated
in FIG. 6, a bottom roller of the pair of front rollers 19 (hereinafter
may be referred to as a "front bottom roller") is driven and rotated
by a driving motor 20 installed in each spinning unit 2. A motor driver
30 20a controls driving of the driving motor 20. The motor driver 20a
controls driving of the driving motor 20 based on a signal output
from the unit controller 15. The bottom roller of each pair of back
rollers 16, third rollers 17, and middle rollers 18 may be driven
and rotated by the driving motor installed in each spinning unit 2
35 or may be driven and rotated by a driving motor installed in the second
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end frame 5.
[0055] A method of controlling the tension of the yarn Y with
the pair of front rollers 19 will now be described.
[0056] When the spinning unit 2 of the spinning machine 1 starts
5 the spinning operation, the tension sensor 10 measures the tension
of traveling yarn Y and transmits a tension measuring signal to the
unit controller 15. The unit controller 15 rotates the pair of front
rollers 19 of the drafting device 6 at the initial speed set for each
lot. The initial speed is preset such that the tension of the yarn
10 Y detected by the tension sensor 10 falls within a predetermined range.
[0057] The unit controller 15 receives the tension measuring
signal and determines whether the tension of the yarn Y indicated
by the tension measuring signal falls within the predetermined range.
If the unit controller 15 determines that the tension of the yarn
15 Y is out of the predetermined range, the unit controller 15 controls
the circumferential speed of the pair of front rollers 19 (the front
bottom roller). In this embodiment, the unit controller 15 controls
the tension of the yarn Y by changing the circumferential speed of
the front bottom roller without changing the number of rotations of
20 the yarn storage roller 11a. The drafting operation by the drafting
device 6, the spinning operation by the air spinning device 8, and
the winding operation by the winding device 13 are continuing in
parallel with the control.
[0058] Specifically, if the tension of the yarn Y is below the
25 predetermined range, the unit controller 15 decreases the
circumferential speed of the pair of front rollers 19 from the initial
speed. More specifically, the unit controller 15 outputs a signal
to the motor driver 20a of the driving motor 20 and decreases the
number of rotations (rpm) of the driving motor 20.
30 [0059] This process changes the feed ratio of the yarn Y
determined based on the number of rotations of the yarn storage roller
11a and the circumferential speed of the pair of front rollers 19.
Specifically, the speed of the yarn Y delivered from the pair of front
rollers 19 to the air spinning device 8 becomes lower than the speed
35 of the yarn Y drawn from the air spinning device 8 by the yarn storage
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FP16-0410-00IN-MRT
roller lla, which changes the feed ratio of the yarn Y and accordingly
increases the tension of the yarn Y. When the unit controller 15
determines that the tension of the yarn Y has increased to the
predetermined range based on the tension measuring signal, the unit
5 controller 15 completes the control of decreasing the circumferential
speed of the front bottom roller and controls the circumferential
speed of the front bottom roller so that the tension of the yarn Y
is maintained within the predetermined range.
[0060] If the tension of the yarn Y is beyond the predetermined
10 range, the unit controller 15 increases the circumferential speed
of the pair of front rollers 19 from the initial speed. This operation
makes the speed of the yarn Y delivered from the pair of front rollers
19 to the air spinning device 8 higher than the speed of the yarn
Y drawn from the air spinning device 8 by the yarn storage roller
15 lla, which changes the feed ratio of the yarn Y. The tension of the
yarn Y decreases with the change in the feed ratio. When the unit
controller 15 determines that the tension of the yarn Y has decreased
to the predetermined range based on the tension measuring signal,
the unit controller 15 completes the control of increasing the
20 circumferential speed of the front bottom roller and controls the
circumferential speed of the front bottom roller so that the tension
of the yarn Y is maintained within the predetermined range.
[0061] In such a configuration that at least one of respective
bottom rollers of the pair of back rollers 16, the pair of third rollers
25 17, and the pair of middle rollers 18 is driven and rotated by the
driving motor installed in each spinning unit 2, the circumferential
speed of at least the pair of back rollers 16, the pair of third rollers
17, or the pair of middle rollers 18 may be controlled in addition
to the control of the circumferential speed of the pair of front
30 rollers 19.
[ 0 0 62] In this embodiment, the unit controller 15 controls the
circumferential speed of the pair of front rollers 19 based on the
tension measuring signal transmitted from the tension sensor 10. The
feed ratio changes with the change in the circumferential speed of
35 the pair of front rollers 19 of the drafting device 6. The change
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FP16-041 0-00IN-MRT
in the feed ratio can change the tension of the fiber bundle F (the
yarn Y) in the downstream side from the pair of front rollers 19.
Consequently, the spinning machine 1 can effectively control the
tension of the yarn Y by controlling the circumferential speed of
5 the pair of front rollers 19 based on the tension measuring signal
transmitted from the tension sensor 10.
[ 0 0 63 J Specifically, if the tension of the yarn Y is detected
below a predetermined range in the tension measuring signal, the unit
controller 15 decreases the circumferential speed of the pair of front
10 rollers 19 from the initial speed until the tension of the yarn Y
increases to the predetermined range. If the tension of the yarn Y
is detected beyond the predetermined range in the tension measuring
signal, the unit controller 15 increases the circumferential speed
of the pair of front rollers 19 from the initial speed until the tension
15 of the yarn Y decreases to the predetermined range. The tension of
the yarn Y can be decreased by increasing the circumferential speed
of the pair of front rollers 19, whereas the tension of the yarn Y
can be increased by decreasing the circumferential speed of the pair
of front rollers 19. The unit controller 15 controls the
20 circumferential speed of the pair of front rollers 19 based on the
tension measuring signal and maintains the tension of the yarn Y within
the predetermined range.
[0064] The tension of the yarn Y may be controlled by controlling
at least one of the drafting device 6, the core yarn supply device
25 7, and the yarn storage device 11. In another way, the tension of
the yarn Y may be controlled by controlling both the pair of front
rollers 19 of the drafting device 6 and the yarn storage device 11.
In still another way, the tension of the yarn Y may be controlled
by controlling both the pair of front rollers 19 of the drafting device
30 6 and the tension adding mechanism 70 of the core yarn supply device
7. Furthermore, the tension of the yarn Y may be controlled by
controlling these three devices, which are the pair of front rollers
19 of the drafting device 6, the tension adding mechanism 70 of the
core yarn supply device 7, and the yarn storage roller 11a of the
35 yarn storage device 11.
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FP16-0410-00IN-MRT
[ 0 0 65] An embodiment has been described as above; however the
embodiment is not limited thereto.
[0066] In the above-described embodiment, the feedback control
based on a result of detection by the tension sensor 10 is provided
5 in parallel with the winding operation of the package P. If the
tension of the yarn Y detected by the tension sensor 10 does not fall
within a predetermined range even with the feedback control over a
certain period, the spinning operation and the winding operation in
the spinning unit 2 may be stopped. In at least one of the drafting
10 device 6, the yarn storage device 11, and the tension adding mechanism
70, a limited range may be set for the amount (such as the number
of rotations of the pair of front rollers 19 and/or the yarn storage
roller lla and the amount of tension added by the tension adding
mechanism 70) to be controlled in the feedback control. In this case,
15 if the controlled amount is out of the limited range, the spinning
operation and the winding operation of the spinning unit 2 may be
stopped. When the spinning operation and the winding operation are
stopped from any of the above-described reasons, the display screen
102 and/or a display unit (not illustrated) installed to each spinning
20 unit 2 may make a display informing that an error has been caused.
[0067] In the above-described embodiment, such a configuration
has been described as an example that the spinning unit 2 of the
spinning machine 1 includes the core yarn supply device 7; however,
the core yarn supply device 7 may not be installed to the spinning
25 unit 2.
[0068] In the above-described embodiment, such a configuration
has been described as an example that the tension adding unit 71 of
the tension adding mechanism 7 0 in the core yarn supply device 7 adds
tension to the yarn Y by bending the core yarn C a plurality of times.
30 In the tension adding mechanism 70, instead of controlling the
actuator 7 6, the tension added to the core yarn C by the tension adding
unit 71 may be adjusted by controlling the degree at which the movable
piece 74 opens with respect to the fixed piece 73 by electrically
adjusting the contact angle of a spring (not illustrated). The
35 mechanism for adding tension to the core yarn C is not limited thereto.
19 I 30
5
FP16-041 0-00IN-MRT
As an example of mechanisms to add tension to the core yarn C, a yarn
path of the core yarn C may be bent with a disk. Tension may be added
to the core yarn C in any position in the upstream side from the core
yarn guiding unit 52.
[0069] In the above-described embodiment, such an exemplary
configuration has been described that the tension sensor 10 measures
the tension of traveling yarn Y between the air spinning device 8
and the yarn storage device 11; however, the position of the tension
sensor 10 is not limited thereto. The tension sensor 10 may measure
10 the tension of the yarn Y at any position between the air spinning
device 8 and the winding device 13.
[0070] In the above-described embodiment, the unit controller
15 serves as a control unit controlling the yarn forming unit and
the winding device 13 based on a result of detection by the tension
15 sensor 10 such that the yarn Y is wound with adjustment of the tension
added by the yarn forming unit. Instead of the unit controller 15,
the machine control device 100 may serve as the control unit.
[0071] The air spinning device 8 may further include a needle
retained by the fiber guiding unit and projecting into the spinning
20 room so as to prevent twist of the fiber bundle from spreading upstream
of the air spinning device. In another case, instead of using the
needle, the air spinning device may prevent twist of the fiber bundle
from spreading upstream of the air spinning device using an end in
the downstream side of the fiber guiding unit. Instead of the above
25 configuration, the air spinning device may include a pair of air jet
nozzles for twisting the fiber bundle in respective directions
opposite to each other. The spinning machine may be an open-end
spinning machine.
[0072] In the spinning unit 2, the yarn storage device 11 has
30 a function of drawing the yarn Y from the air spinning device 8; however,
the yarn Y may be drawn from the air spinning device 8 by a delivery
roller and a nip roller. In this case, the yarn storage device 11
can be omitted. Furthermore, a slack tube absorbing slack of the yarn
Y with suction airflow, a mechanical compensator, or the like may
35 replace the yarn storage device 11. In a configuration using a
20 I 30
FP16-0410-00IN-MRT
deli very roller, the unit controller 15 controls the circumferential
speed of the delivery roller when the unit controller 15 determines
that the tension of the yarn Y is out of a predetermined range. The
change in the circumferential speed of the delivery roller changes
5 the feed ratio of the yarn Y. The change in the feed ratio can change
the tension of the yarn Y drawn by the deli very roller. Consequently,
in the spinning machine, the tension of the yarn Y is controlled by
controlling the circumferential speed of the delivery roller based
on a result of detection by the tension sensor 10.
10 [0073] The devices in the spinning machine 1 are disposed in a
manner that the yarn Y supplied in the upper side are wound in the
lower side in the height direction. The devices may be disposed such
that the yarn supplied in the lower side is wound in the upper side.
[0085] In the spinning machine 1, the traverse guide 23 is driven
15 by power from the second end frame 5 (in other words, driven by power
20
25
shared by a plurality of spinning units 2) . Instead of this
configuration, the devices (such as the air spinning device and the
winding device) of each spinning unit 2 may be driven on a per-spinning
unit 2 basis.
[0074] Furthermore, the tension sensor 10 may be disposed
upstream of the yarn monitoring device 9 in a direction in which the
yarn Y travels. The unit controller 15 may be provided in each
spinning unit 2. The yarn monitoring device 9 and the waxing device
12 may be omitted from each spinning unit 2.
[0075] FIG. 1 illustrates the spinning machine 1 winding the yarn
into the package P in a cheese-like shape; however, the spinning
machine 1 can wind yarn into a package in a corn-like shape. In the
case with a package in a corn-like shape, although the yarn traverse
causes slack on the yarn, the slack can be absorbed by the yarn storage
30 device 11. Materials and shapes of the components are not limited
to those described above, and various materials and shapes may be
employed. Instead of the spinning machine 1 including the air
spinning device 8, a ring spinning frame may be usable. The ring
spinning frame is a spinning machine forming yarn from a fiber bundle
35 (a spun material) and winds the yarn onto a spinning bobbin. A yarn
21 I 30
FP16-0410-00IN-MRT
forming unit in the ring spinning frame corresponds to the pair of
front rollers of the drafting device and/or the tension adding unit
of the core yarn supply device. If a ring spinning frame is used as
a spinning machine, the ring spinning frame may include a core yarn
5 supply device or may not include the same. If the ring spinning frame
includes a core yarn supply device, a fiber bundle and/or core yarn
are used as a spun material.
10
[0076] At least a part of the above-described embodiments may
be combined as appropriate.
[0077] A spinning machine according to an embodiment of the
present disclosure includes a yarn forming unit forming yarn from
a spun material while adjusting the tension of the spun material,
a winding device winding the yarn formed by the yarn forming unit,
a tension detecting unit detecting the tension of the yarn in the
15 upstream side from the winding device in a direction in which the
yarn travels, and a control unit controlling the yarn forming unit
and the winding device based on a result of detection by the tension
detecting unit such that the yarn is wound with adjustment of the
tension added by the yarn forming unit.
20 [0078] A spinning machine according to an embodiment of the
present disclosure can maintain the tension of yarn within a
predetermined range by providing feedback control to devices based
on the tension of the yarn detected by a tension detecting unit. The
spinning machine in this configuration can improve the quality of
25 yarn.
[0079] A spinning machine according to an embodiment of the
present disclosure includes a core yarn supply device having a
supporting unit supporting a core yarn package with core yarn wound
thereon and a tension adding unit adding tension to the core yarn
30 unwound from the core yarn package. A control unit may control the
operation of a yarn forming unit based on a result of detection by
a tension detecting unit. A winding device may wind yarn including
core yarn. This configuration enables winding of yarn while forming
the yarn including core yarn with higher quality.
35 [0080] A spinning machine according to an embodiment of the
22 I 30
FP16-0410-00IN-MRT
present disclosure includes a yarn forming unit configured to form
yarn from a spun material, a winding device configured to wind yarn
formed by the yarn forming unit, a tension detecting unit configured
to detect the tension of yarn in an upstream side from the winding
5 device in a direction in which the yarn travels, and a control unit
configured to control the yarn forming unit based on a result of
detection by the tension detecting unit such that the yarn is wound
onto the winding device with adjustment of the tension added to the
spun material in the yarn forming unit. The control unit adjusts the
10 tension by controlling a device of the yarn forming unit disposed
at least in an upstream side or in a downstream side from a position
at which the spun material is twisted in the direction in which the
yarn travel.
[0081] A spinning machine according to an embodiment of the
15 present disclosure can maintain the tension of yarn within a
predetermined range by providing feedback control to devices based
on the tension of yarn detected by the tension detecting unit. With
this configuration, the spinning machine can improve the quality of
20
yarn.
[0082] In an embodiment, the yarn forming unit may include a
drafting device configured to draft a fiber bundle used as a spun
material. The drafting device may include a plurality of pairs of
rollers including a pair of front rollers disposed in a most downstream
position in a direction in which the fiber bundle is drafted. The
25 control unit may control the circumferential speed of the pair of
front rollers based on the result of detection by the tension detecting
unit. The feed ratio of the fiber bundle changes with a change in
the circumferential speed of the pair of front rollers of the drafting
device. The change in the feed ratio can change the tension of the
30 fiber bundle (the yarn) in the downstream side from the pair of front
rollers. Consequently, in the spinning machine, effective control
on the tension of yarn can be achieved by controlling the
circumferential speed of the pair of front rollers based on a result
of detection by the tension detecting unit.
35 [0083] In an embodiment, when the tension of yarn is detected
23 I 30
FP16-0410-00IN-MRT
below a predetermined range in a result of detection, the control
unit may provide control of decreasing the current circumferential
speed of the pair of front rollers until the tension of the yarn
increases to the predetermined range. On the contrary, when the
5 tension of the yarn is detected beyond the predetermined range in
a result of detection, the control unit may provide control of
increasing the current circumferential speed of the pair of front
rollers until the tension of the yarn decreases to the predetermined
range. An increase in the circumferential speed can decrease the
10 tension of yarn, whereas a decrease in the circumferential speed of
the pair of front rollers can increase the tension of yarn. The
control unit controls the circumferential speed of the pair of front
rollers based on a result of detection so as to maintain the tension
of the yarn within a predetermined range.
15 [0084] In an embodiment, the yarn forming unit includes a yarn
storage roller disposed upstream of the winding device in a direction
in which the yarn travels and configured to store the yarn. The
control unit may control the number of rotations per unit time of
the yarn storage roller based on a result of detection by the tension
20 detecting unit such that the tension of the yarn detected by the
tension detecting unit falls within a predetermined range. A change
in the number of rotations per unit time of the yarn storage roller
changes the feed ratio of the yarn. The change in the feed ratio can
change the tension of the yarn stored in the yarn storage roller.
25 In the spinning machine, the tension of yarn is effectively controlled
by controlling the number of rotations of the yarn storage roller
based on a result of detection by the tension detecting unit.
[0085] In an embodiment, when the tension of yarn is detected
below a predetermined range in the result of detection, the control
30 unit may provide control of increasing the current number of rotations
of the yarn storage roller until the tension of the yarn increases
to the predetermined range. On the contrary, when the tension of yarn
is detected beyond the predetermined range in a result of detection,
the control unit may provide control of decreasing the current number
35 of rotations of the yarn storage roller until the tension of the yarn
24 I 30
FP16-041 0-00IN-MRT
decreases to the predetermined range. An increase in the number of
rotations of the yarn storage roller can increase the tension of yarn,
whereas a decrease in the number of rotations of the yarn storage
roller can decrease the tension of yarn. The control unit controls
5 the number of rotations of the yarn storage roller based on a result
of detection so as to maintain the tension of yarn within a
predetermined range.
[0086] In an embodiment, the spinning machine may include an air
spinning device configured to generate the yarn by applying swirling
10 airflow to a fiber bundle, and the yarn storage roller may store the
yarn while drawing the yarn generated by the air spinning device.
With this configuration, the yarn storage roller can control the
tension of yarn generated by the air spinning device, and consequently,
yarn is generated in the air spinning device at optimum tension, which
15 can improve the quality of the yarn.
[0087] A spinning machine according to an embodiment of the
present disclosure includes a yarn forming unit including a core yarn
supply device that includes a supporting unit configured to support
a core yarn package with core yarn wound thereon and a tension adding
20 unit configured to add tension to the core yarn unwound from the core
yarn package, the yarn forming unit being configured to form yarn
from a spun material including the core yarn, a winding device
configured to wind the yarn formed by the yarn forming unit, a tension
detecting unit configured to detect tension of the yarn in the upstream
25 side from the winding device in a direction in which the yarn travels,
and a control unit configured to control the tension adding unit based
on a result of detection by the tension detecting unit such that the
yarn is wound onto the winding device with adjustment of tension added
to the spun material in the yarn forming unit.
30 [0088] The spinning machine according to an embodiment of the
present disclosure can maintain the tension of yarn within a
predetermined range by providing feedback control to devices based
on the tension of yarn detected by the tension detecting unit. The
spinning machine in this configuration can improve the quality of
35 yarn including core yarn.
25 I 30
[0089]
FP16-0410-00IN-MRT
In an embodiment, the control unit may control the tension
adding unit based on a result of detection by the tension detecting
unit such that the tension of the yarn detected by the tension
detecting unit falls within a predetermined range. This process can
5 improve the quality of yarn wound by the winding device.
[0090] According to an embodiment of the present disclosure, the
quality of yarn can be improved.

We claim:
1. A spinning machine (1) comprising:
a yarn forming unit (6, 11a) configured to form yarn from a spun
material;
5 a winding device ( 13) configured to wind the yarn formed by the
yarn forming unit (6, 11a);
a tension detecting unit (10) configured to detect tension of
the yarn in an upstream side from the winding device ( 13) in a direction
in which the yarn travels; and
10 a control unit (15) configured to control the yarn forming unit
15
(6, 11a) based on a result of detection by the tension detecting unit
(10) such that the yarn is wound onto the winding device (13) with
adjustment of tension added to the spun material in the yarn forming
unit (6, 11a), wherein
the control unit (15) adjusts the tension by controlling a
device of the yarn forming unit (6, 11a) disposed at least in an
upstream side or a downstream side from a position at which the spun
material is twisted in the direction in which the yarn travels.
20 2. The spinning machine ( 1) according to claim 1, further
comprising: a drafting device (6) configured to draft a fiber
bundle used as the spun material, wherein
the drafting device (6) includes a plurality of pairs of rollers
including a pair of front rollers (19) disposed in a most downstream
25 position in a direction in which the fiber bundle is drafted, and
the control unit (15) controls a circumferential speed of the
pair of front rollers (19) based on the result of detection by the
tension detecting unit (10).
30 3. The spinning machine (1) according to claim 2, wherein
when the tension of the yarn is detected below a predetermined
range in the result of detection, the control unit (15) provides
control of decreasing a current circumferential speed of the pair
of front rollers ( 19) until the tension of the yarn increases to the
35 predetermined range, and
27 I 30
FP16-0410-00IN-MRT
when the tension of the yarn is detected beyond the
predetermined range in the result of detection, the control unit ( 15)
provides control of increasing a current circumferential speed of
the pair of front rollers (19) until the tension of the yarn decreases
5 to the predetermined range.
4. The spinning machine (1) according to any one of claims 1 to
3, wherein
the yarn forming unit includes a yarn storage roller (lla)
10 disposed upstream of the winding device (13) in the direction in which
the yarn travels and configured to store the yarn, and
the control unit ( 15) controls the number of rotations per unit
time of the yarn storage roller (lla) based on the result of detection
by the tension detecting unit (10) such that tension of the yarn
15 detected by the tension detecting unit (10) falls within the
predetermined range.
5. The spinning machine (1) according to claim 4, wherein
when tension of the yarn is detected below a predetermined range
20 in the result of detection, the control unit (15) provides control
of increasing the current number of rotations of the yarn storage
roller ( lla) until the tension of the yarn increases to the
predetermined range, and
when tension of the yarn is detected beyond the predetermined
25 range in the result of detection, the control unit (15) provides
control of decreasing the current number of rotations of the yarn
storage roller (lla) until the tension of the yarn decreases to the
predetermined range.
30 6. The spinning machine (1) according to claim 4 or 5, further
comprising;
an air spinning device (7) configured to generate the yarn by
applying swirling airflow to a fiber bundle, wherein
the yarn storage roller (lla) stores the yarn while drawing the
35 yarn generated by the air spinning device (7).
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FP16-0410-00IN-MRT
7. A spinning machine (1) comprising:
a yarn forming unit including a core yarn supply device (7) that
includes a supporting unit (50) configured to support a core yarn
5 package with core yarn wound thereon and a tension adding unit (71)
configured to add tension to the core yarn unwound from the core yarn
package, the yarn forming unit being configured to form yarn from
a spun material including the core yarn;
a winding device (13) configured to wind the yarn formed by the
10 yarn forming unit;
a tension detecting unit (10) configured to detect tension of
the yarn in an upstream side from the winding device ( 13) in a direction
in which the yarn travels; and
a control unit (15) configured to control the tension adding
15 unit (71) based on a result of detection by the tension detecting
unit (10) such that the yarn is wound onto the winding device (13)
with adjustment of tension added to the spun material in the yarn
forming unit.
20
25
8. The spinning machine (1) according to claim 7, wherein the
control unit ( 15) controls the tension adding unit based on the result
of detection by the tension detecting unit (10) such that tension
of the yarn detected by the tension detecting unit ( 10) falls within
a predetermined range.