Our ref. PCT-509
DESCRIPTION
[Title of the Invention] SPINNING MACHINE
[Technical Field]
[0001] The present invention relates to a technology of a spinning machine.
[Background Art]
[0002] Conventionally, there has been known a spinning machine that drafts a fiber
bundle and twists the drafted fiber bundle, thereby producing spun yams (for example, see
Patent Document 1). In the spinning machine, a plurality of draft roller pairs that draft the
fiber bundle are provided. Since the draft roller pairs feed the held fiber bundle by rotation,
the draft roller pairs can draft the fiber bundle according to a difference in feeding speeds of
the adjacent draft roller pairs.
[0003] The draft roller pair is constituted by a bottom roller that is rotated via a power
mechanism and a top roller that is driven to rotate in a state of contact with the bottom roller.
The top roller is an elastic roller formed of rubber and the like, and the surface of the top
roller may sometimes be abraded. In particular, when the position of the fiber bundle held
by the draft roller pairs is constant, the abrasion of a portion in contact with the fiber bundle
may swiftly progress.
[0004] Accordingly, there has been proposed a structure wherein a guiding portion
(trumpet) of the fiber bundle is moved in parallel with respect to a rotating shaft of the draft
roller pairs, and a holding position of the fiber bundle (roving) is changed (for example, see
Patent Document 2). However, in the above-described structure, when the fiber bundle is
thick, fibers constituting the fiber bundle may fall off from the draft roller pairs. When the
guiding portion moves while the rotation of the draft roller pairs is stopped, the fiber bundle
held by the draft roller pairs is drafted, and the fiber bundle is unintentionally cut.
[Citation List]
[Patent Literature]
[0005] [PTL 11 Japanese Unexamined Patent Application Publication No.
201 1-99192.
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[PTL 21 Japanese Unexamined Patent Application Publication No. 1996-29 1429.
[Summary of the Invention]
[Technical Problem]
[0006] It is an object of the present invention to provide a spinning machine that can
extend the life of draft roller pairs by performing control to move or stop a fiber bundle with
respect to the draft roller pairs according to the fiber bundle to be drafted, without reducing
quality of a spun yarn.
[Solution to the Problem]
[0007] The spinning machine of the first aspect of the present invention includes draft
roller pairs configured to draft a fiber bundle, a guiding unit configured to regulate a width
(thickness) of the fiber bundle drafted by the draft roller pairs and guide the fiber bundle, a
spinning unit configured to produce a spun yarn by twisting the fiber bundle drafted by the
draft roller pairs, a movable base unit to which the guiding unit and the spinning unit are
mounted, a driving unit configured to move the movable base unit in parallel with respect to a
rotating shaft direction of the draft roller pairs, a detecting unit configured to detect a position
of at least one of the guiding unit, the spinning unit, and the movable base unit, and a control
unit configured to transmit a positional command signal to the driving unit based on a
detection signal from the detecting unit and control a position of the movable base unit,
thereby adjusting a relative positional relation of the guiding unit and the spinning unit with
respect to the draft roller pairs and changing a holding position of the fiber bundle held by the
draft roller pairs.
[0008] The spinning machine of the second aspect of the present invention includes draft
roller pairs configured to draft a fiber bundle, a guiding unit configured to regulate a width
(thickness) of the fiber bundle drafted by the draft roller pairs and guide the fiber bundle, a
spinning unit configured to produce a spun yarn by twisting the fiber bundle drafted by the
draft roller pairs, a movable base unit to which the guiding unit and the spinning unit are
mounted, a driving unit configured to move the movable base unit in parallel with respect to a
rotating shaft direction of the draft roller pairs, a detecting unit configured to detect a position
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of at least one of the guiding unit, the spinning unit, and the movable base unit, and a control
unit configured to transmit a positional command signal and a speed command signal to the
driving unit based on a detection signal from the detecting unit and control a position and a
speed of the movable base unit, thereby adjusting a relative positional relation of the guiding
unit and the spinning unit with respect to the draft roller pairs and changing a holding position
of the fiber bundle held by the draft roller pairs.
[0009] The third aspect of the present invention relates to the spinning machine according
to the first or second aspect of the present invention. In the spinning machine, the control
unit controls the driving unit to successively reciprocate the movable base unit.
[0010] The fourth aspect of the present invention relates to the spinning machine
according to the first or second aspect of the present invention. In the spinning machine, the
control unit controls the driving unit to intermittently move the movable base unit,
[0011] The fifth aspect of the present invention relates to the spinning machine according
to any one of the first to third aspect of the present invention. In the spinning machine, the
control unit adjusts a position of the spinning unit at a start time of spinning to an origin
position by controlling the driving unit.
[0012] The sixth aspect of the present invention relates to the spinning machine according
to any one of the first to fifth aspect of the present invention. In the spinning machine, the
control unit controls a movement of the movable base unit according to a thickness of the
fiber bundle orland a width dimension in the rotating shaft direction of the draft roller pairs.
[0013] The seventh aspect of the present invention relates to the spinning machine
according to any one of the first to sixth aspect of the present invention. In the spinning
machine, when the draft roller pairs are rotating, the control unit controls the driving unit to
operate, and when the draft roller pairs are not rotating, the control unit controls the driving
unit to stop.
[0014] The eighth aspect of the present invention relates to the spinning machine
according to any one of the first to seventh aspect of the present invention. In the spinning
machine, when the fiber bundle drafted by the draft roller pairs is larger than a predetermined
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value, the control unit controls the driving unit to stop.
[0015] The ninth aspect of the present invention relates to the spinning machine
according to any one of the first to eighth aspect of the present invention. The driving unit is
constituted by a stepping motor.
[0016] The tenth aspect of the present invention relates to the spinning machine
according to any one of the first to ninth aspect of the present invention. The spinning unit
twists the fiber bundle with swirling airflow and produces the spun yarn.
[0017] The eleventh aspect of the present invention relates to the spinning machine
according to any one of the first to tenth aspect of the present invention. The spinning
machine includes a setting unit configured to set control mode of the driving unit.
[0018] The twelfth aspect of the present invention relates to the spinning machine
according to any one of the first to eleventh aspect of the present invention. The spinning
machine includes a winding unit configured to wind the spun yarn around a package.
[0019] The thirteenth aspect of the present invention relates to the spinning machine
according to any one of the first to twelfth aspect of the present invention. The spinning
machine includes a memory unit configured to store a driving amount of the driving unit and
a storing unit configured to store a durability threshold value of the draft roller pairs. The
control unit changes the holding position of the fiber bundle held by the draft roller pairs
based on the driving amount stored in the memory unit and the durability threshold value
stored in the storing unit.
[Advantageous Effects of Invention]
[0020] As ef5ects of the present invention, the following advantageous effects are
provided.
[0021] According to the spinning machine of the first aspect of the present invention,
since the positional control of the movable base unit is performed, the movable base unit can
precisely be moved. Accordingly, the life of the draft roller pairs (more particularly, top
rollers orland bottom rollers constituting the draft roller pairs) can be extended without
reducing the quality of the spun yarn. Even when the fiber bundle is thick, the fibers
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constituting the fiber bundle can be prevented from falling off from the draft roller pairs.
[0022] According to the spinning machine of the second aspect of the present invention,
since the positional control and the speed control of the movable base unit are performed, the
movable base unit can precisely be moved. Accordingly, occurrence of periodic unevenness
and the like, which reduces the quality of the spun yarn, can be reduced. Even when the
fiber bundle is thick, the fibers constituting the fiber bundle can be prevented from falling off
from the draft roller pairs.
[0023] According to the spinning machinne of the third aspect of the present invention, the
holding position of the fiber bundle held by the draft roller pairs can successively be changed.
Accordingly, progress of abrasion with regards to a portion of the draft roller pairs (more
particularly, the top rollers orland bottom rollers constituting the draft roller pairs) can be
prevented, and the life of the draft roller pairs can be extended.
[0024] According to the spinning machine of the fourth aspect of the present invention,
the holding position of the fiber bundle held by the draft roller pairs can intermittently be
changed. Accordingly, the holding position can be changed before the abrasion of the draft
roller pairs (more particularly, the top rollers orland bottom rollers constituting the draft roller
pairs) exceeds its tolerable range, and the life of the draft roller pairs can be extended. When
successively changing the holding position, it is difficult to control the driving unit at a super
low speed. Accordingly, the holding position of the fiber bundle held by the draft roller
pairs is intermittently changed, and the reduction in the yarn quality can be prevented.
[0025] According to the spinning machine of the fifth aspect of the present invention, the
spinning unit can be arranged at the origin position at the start of spinning. When starting
the spinning, the fiber bundle F drafted by the draft roller pairs is introduced to the spinning
unit. Accordingly, since the spinning is started in a state where the spinning unit is located at
the origin position, the spinning can smoothly be started.
[0026] According to the spinning machine of the sixth aspect of the present invention, a
holdable range of the fiber bundle held by the draft roller pairs can be obtained to the largest
degree. Accordingly, the life of the draft roller pairs can be extended even more. Even
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when the fiber bundle is thick, the fibers constituting the fiber bundle can reliably be
prevented from falling off from the draft roller pairs.
[0027] According to the spinning machine of the seventh aspect of the present invention,
when the draft roller pairs are not rotating, the movement of the movable base unit can be
stopped. Accordingly, the fiber bundle held by the draft roller pairs can be prevented from
being extended by the movable base unit, and unintentional cutting of the fiber bundle can be
avoided.
[0028] According to the spinning machine of the eighth aspect of the present invention,
when the thickness of the fiber bundle is larger than a predetermined value, the movement of
the movable base unit can be stopped. Accordingly, even when the fiber bundle is thick, the
fibers constituting the fiber bundle can reliably be prevented from falling off from the draft
roller pairs.
[0029] According to the spinning machine of the ninth aspect of the present invention, a
simple control system can be realized by use of the stepping motor. Accordingly, costs of
the driving unit and the control system can be reduced.
[0030] According to the spinning machine of the tenth aspect of the present invention,
since the fiber bundle is twisted by the swirling airflow, a high spinning speed can be realized.
When the spinning speed becomes high, behavior of the fibers of the fiber bundle is also
easily affected by external change. In addition, the progress of abrasion of the draft roller
pairs (more particularly, the top rollers or/and the bottom rollers constituting the draft roller
pairs) also becomes fast by the fiber bundle that is drafted at a high speed. The movable
base unit is moved by performing the positional control of the movable base unit, and at least
the life of the draft roller pairs can appropriately be extended without affecting the behavior of
the fibers of the fiber bundle.
[0031] According to the spinning machine of the eleventh aspect of the present invention,
the control mode can be set or selected by operating the setting unit. Accordingly, the
spinning machine can perform optimal control in accordance with characteristics of the fiber
bundle.
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[0032] According to the spinning machine of the twelfth aspect of the present invention,
production capacity of the packages by the spinning machine can be improved.
COO331 According to the spinning machine of the thirteenth aspect of the present
invention, the draft roller pairs (more particularly, the top rollers orland the bottom rollers
constituting the draft roller pairs) can be used up to their limitation.
[Brief Description of Drawings]
[0034] [FIG 11 FIG 1 is a drawing illustrating an overall configuration of a spinning
machine.
[FIG 21 FIG 2 is a drawing illustrating a configuration of a draft unit.
[FIG 31 FIG. 3 is a drawing of the draft unit viewed fiom a direction of an arrow X.
[FIG 41 FIG 4 is a drawing of the draft unit viewed fiom a direction of an arrow Y.
[FIG 51 FIG, 5 is a drawing of the draft unit viewed fkom a direction of an arrow Z.
[FIG 61 (FIG. 6A) is a drawing illustrating a configuration for converting a rotational
movement into a sliding movement by a spiral shaft and a nut. (FIG. 6B) is a drawing
illustrating a configuration for converting the rotational movement into the sliding movement
by a rack gear and a pinion gear.
[FIG 71 FIG 7 is a diagram illustrating displacement of a spinning unit and the like over
time.
[FIG 81 FIG. 8 is a diagram illustrating displacement of the spinning unit and the like
over time.
[FIG 91 FIG. 9 is a drawing illustrating a configuration of an air spinning device.
[Description of Embodiments]
[0035] First, the entire configuration of a spinning machine 100 will briefly be described.
The spinning machine 100 is a spinning machine that produces a spun yarn Y from a fiber
bundle F and forms a package P. The spinning machine 100 includes a sliver supply unit 1, a
draft unit 2, a spinning unit 3, a defect detecting unit 4, a tension stabilizing unit 5, and a
winding unit 6, which are arranged in this order along a feeding direction of the fiber bundle F
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and the spun yarn Y. The spinning machine 100 is connected to a control unit 7 that enables
transmission of a control signal to each unit (see FIG. 2).
COO361 The sliver supply unit 1 supplies the fiber bundle F (sliver), which serves as a raw
material of the spun yarn Y, to the draft unit 2. The sliver supply unit 1 includes a sliver case
11 and a sliver guide (not illustrated). The fiber bundle F stored in the sliver case 11 is
guided by the sliver guide and introduced to the draft unit 2.
[0037] The draft unit 2 drafts the fiber bundle F and draws the fiber bundle F into a
predetermined thickness. The draft unit 2 includes four sets of draft roller pairs 21,22, 23,
and 24, which are a back roller pair 21, a third roller pair 22, a middle roller pair 23, and a
front roller pair 24, arranged in this order along the feeding direction of the fiber bundle F.
Since the draR roller pairs 2 1,22,23, and 24 feed the held fiber bundle F by rotation, the draft
roller pairs 21,22,23, and 24 can draft the fiber bundle F by the difference in the feeding
speeds of the adjacent draft roller pairs.
[0038] The spinning unit 3 twists the fiber bundle F that has been drafted to the
predetermined thickness, thereby producing the spun yarn Y. The spinning unit 3 is arranged
downstream of the front roller pair 24 of the draft unit 2. The spinning unit 3 can produce
the spun yarn Y from the fiber bundle F that is drafted to the predetermined thickness. The
detailed configuration of the spinning unit 3 will be described later.
[0039] The defect detecting unit 4 detects a defective portion of the produced spun yam Y.
More specifically, the defect detecting unit 4 irradiates the spun yarn U with a light-emitting
diode (not illustrated) as a light source and detects a reflection light amount from the spun
yarn Y. The defect detecting unit 4 is connected to the control unit 7 via an analyzer (not
illustrated) and can transmit a detection signal to the control unit 7. The control unit 7 can
determine presence or absence of the defective portion based on the detection signal from the
defect detecting unit 4. The defective portion that can be detected by the defect detecting
unit 4 includes foreign matters such as polypropylene contained in the spun yarn Y, in
addition to irregularity in the thickness of the spun yarn Y. Besides an optical sensor
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according to the present embodiment, the defect detecting unit 4 may adapt an electrostatic
capacitance type sensor.
(00401 The tension stabilizing unit 5 appropriately maintains and stabilizes the tension
applied to the spun yarn Y. The tension stabilizing unit 5 includes an unwinding member 5 1
and a roller 52. When the tension applied to the spurn yarn Y is low, the unwinding member
5 1 rotates with the roller 52 and winds the spun yarn Y around the roller 52. When the
tension applied to the spurn yarn Y is high, the unwinding member 51 independently rotates
with respect to the roller 52 and unwinds the spun yam Y wound around the roller 52.
[0041] The winding unit 6 winds the spun yarn Y and forms the package P. The winding
unit 6 includes a driving roller 61 and a cradle (not illustrated). The driving roller 61 rotates
a bobbin B held by the cradle. The winding unit 6 winds the spun yarn Y, thereby forming
the package P. Since the winding unit 6 traverses the spun yarn Y by a not-illustrated
traverse device, unevenness of the spun yarn Y on the package P is prevented.
[0042] As long as the draft unit 2 that is the characterizing feature of the spinning
machine 100 is provided, detailed configuration does not matter. The sliver supply unit 1,
the spinning unit 3, the defect detecting unit 4, the tension stabilizing unit 5, the winding unit
6, andlor other configuration are not limited. The position at which each unit is arranged is
also not limited.
(00431 Next, the configuration of the draft unit 2 will be described in detail. The draft
roller pairs 2 1,22,23, and 24 are respectively constituted by bottom rollers 2 1 A, 22A, 23A,
and 24A and top rollers 21B, 22B, 23B, and 24B. Apron bands 23C and 23C made of
synthetic rubber are wound around the bottom roller 23A and the top roller 23B constituting
the middle roller pair 23.
(00441 The bottom rollers 2 1 A, 22A, 23A, and 24A are rotated by a not-illustrated power
mechanism in a travel direction of the fiber bundle F. The top rollers 21B, 22B, 23B, and
24B are driven to rotate while making contact with the bottom rollers 2 1 A, 22A, 23A, and
24A. The respective draft roller pairs 21,22,23, and 24 are set such that circumferential
speeds of the draft roller pairs 2 1,22,23, and 24 are sequentially increased along the feeding
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direction of the fiber bundle F.
[0045] As the fiber bundle F held by the draft roller pairs 21,22,23, and 24 passes
through the respective draft roller pairs 21,22,23, and 24, the feeding speed is increased, and
the fiber bundle F is drafted between the adjacent draft roller pairs 21,22,23, and 24. Thus,
the draft unit 2 can gradually narrow the width (thickness) of the fiber bundle F to a
predetermined thickness.
COO461 The spinning unit 3 is mounted to a movable base unit 25 via a bracket that holds
the spinning unit 3. The movable base unit 25 is supported by two guiding shafts 25 1
provided in parallel with respect to the rotating shafts of the draft roller pairs 2 1,22,23, and
24. The movable base unit 25 is supported under a state in which the guiding shafts 25 1 are
inserted through sliding holes of the movable base unit 25.
[0047] A driving unit 26 is arranged below the movable base unit 25 (the opposite side
with respect to the side where the draft roller pairs 21,22,23, and 24 are arranged). The
driving unit 26 according to the present embodiment includes a stepping motor 26 1, a cam
262, and a cam follower 263. The stepping motor 261 rotates the cam 262, thereby having
the cam follower 263, which is mounted to the movable base unit 25, to be driven. Since the
movable base unit 25 is urged by springs 253 mounted on the guiding shafts 251, the movable
base unit 25 can follow the shape of the cam 262.
[0048] The movable base unit 25 can smoothly move in parallel with respect to the
rotating shafts of the draft roller pairs 2 1, 22,23, and 24 (see an mow T in FIGS. 3 and 4).
The spinning unit 3 mounted to the movable base unit 25 can also move in parallel with
respect to the rotating shafts of the draft roller pairs 2 1,22,23, and 24, integrally with the
movable base unit 25.
[0049] As described above, the driving unit 26 according to the present embodiment
adopts the configuration in which a cam mechanism converts a rotational movement into a
linear movement. As is illustrated in FIG. 6A, a spiral shaft 264 and a nut 265 can
alternatively convert a rotational movement into a sliding movement. As is illustrated in FIG.
6B, a rack gear 266 and a pinion gear 267 can also convert the rotational movement into the
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sliding movement.
[0050] The driving unit 26 according to the present embodiment can be realized by not
only a stepping motor but also a servo motor and the like. The stepping motor is used as the
power source of the driving unit 26, thereby simplifying a control system. Accordingly, the
costs of the driving unit 26 and the control system can be reduced.
[0051] The draft unit 2 includes a first guiding unit 27 at upstream of the back roller pair
21. The first guiding unit 27 guides the fiber bundle F supplied from the sliver supply unit 1
to the back roller pair 21. The first guiding unit 27 is mounted to the movable base unit 25
via a bracket that supports the first guiding unit 27.
[0052] The draft unit 2 includes a second guiding unit 28 between the third roller pair 22
and the middle roller pair 23. The second guiding unit 28 guides the fiber bundle F fed from
the third roller pair 22 to the middle roller pair 23, The second guiding unit 28 is mounted to
the movable base unit 25 via a bracket that supports the second guiding unit 28.
[0053] The first guiding unit 27 and the second guiding unit 28 that are mounted to the
movable base unit 25 can move in parallel with respect to the rotating shafts of the draft roller
pairs 2 1,22,23, and 24, integrally with the movable base unit 25 (see the arrow T in FIGS. 3
and 4). The first guiding unit 27 and the second guiding unit 28 can move in parallel with
respect to the rotating shafts of the draft roller pairs 21,22,23, and 24 under a state in which
their positions are kept constant with respect to the spinning unit 3.
LO0541 As described above, since the first guiding unit 27 according to the present
embodiment is mounted to the movable base unit 25, the first guiding unit 27 moves together
with the spinning unit 3. The first guiding unit 27 may be fixed on a frame of a main body
of the spinning machine 100 and the like and may be configured not to move.
[0055] As is illustrated in FIG 3, in the present embodiment, the first guiding unit 27, the
second guiding unit 28, and the spinning unit 3 are arranged on a straight line. The first
guiding unit 27, the second guiding unit 28, and the spinning unit 3 may be arranged on a
substantially straight line. When the first guiding unit 27 is fixed on the frame, the first
guiding unit 27 may not necessarily be arranged on the straight line with respect to the second
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guiding unit 28 and the spinning unit 3.
[0056] As a case where the first guiding unit 27 is configured not to be movable, there is
a case in which the fiber bundle F is thick. When the width (thickness) of the fiber bundle F
held by the back roller pair 21 is large and there is no extra space with respect to the width
dimension of the back roller pair 21, if the first guiding unit 27 is moved, the fibers
constituting the fiber bundle F would fall off from the back roller pair 2 1. Accordingly,
when the fiber bundle F is thick, it is preferable that the first guiding unit 27 be provided not
movable.
[0057] In the drafi unit 2, a detecting unit 29 is mounted in the vicinity of the movable
base unit 25. The detecting unit 29 is a magnetic sensor (Hall IC) that can detect the
magnetic force of a magnet M mounted to the movable base unit 25. More specifically, the
detecting unit 29 converts an output voltage in accordance with change in magnetic flux
density, thereby detecting the position of the magnet M based on the value of the output
voltage. The detecting unit 29 is connected to the control unit 7 via an analyzer (not
illustrated). Accordingly, the control unit 7 can recognize the position of the magnet M, that
is, the position of the movable base unit 25, based on a detection signal fiom the detecting
unit 29. The mounting position of the magnet M and the like are not limited.
[0058] The control unit 7 can transmit a control signal to the driving unit 26 based on the
detection signal fiom the detecting unit 29. The control unit 7 can control the position of the
movable base unit 25, that is, the position of the spinning unit 3 and the like, based on the
detection signal from the detecting unit 29.
100591 As is illustrated in FIG. 6A, with regards to the configuration in which the
rotational movement is converted into the sliding movement by the spiral shaft 264 and the
nut 265, overrunning of the movable base unit 25 is necessary to be prevented. Accordingly,
the detecting unit 29 may be provided on bilateral sides of the moving range of the movable
base unit 25. In this embodiment and other embodiments, it is also possible, that the
mounting position of the detecting unit 29 is not limited. Similarly, the number of detecting
units 29 is also not limited.
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[0060] Next, the control mode of the spinning machine 100 will be described. A vertical
axis of FIG. 7 represents an elapsed time t. A horizontal axis of FIG. 7 represents
displacement of the spinning unit 3 and the like. The displacement of the spinning unit 3 or
the like is the distance the spinning unit 3, the first guiding unit 27, and the second guiding
unit 28 moved from an origin position 0.
[0061] In the present control mode, the control unit 7 controls the driving unit 26, thereby
successively reciprocating the movable base unit 25. Since the spinning machine 100
includes a setting unit 8 that can set the control mode of the driving unit 26 (see FIG. 2), the
control mode can be set according to a type of fiber bundle F. Accordingly, in the present
control mode of the present embodiment, since the control unit 7 controls the driving unit 26
based on the settings of the setting unit 8, the movable base unit 25 can successively be
reciprocated,
[0062] According to this control mode, the spinning machine 100 can successively
change the holding position of the fiber bundle F held by the draft roller pairs 21,22,23, and
24. Accordingly, abrasion with regards to a portion of the draft roller pairs 21,22,23, and
24 (in the present embodiment, the top rollers 21B, 22B and 24B) can be prevented from
exceeding its tolerable range, and the life of the top rollers 21B, 22B and 24B can be extended.
In the present embodiment, since the apron bands 23C and 23C are wound around the middle
roller pair 23, the life ofithe apron bands 23C can be extended instead of the middle roller pair
23 in a precise sense.
[0063] The target position of the spinning unit 3 means the ideal position of the spinning
unit 3 for every unit time, which is determined based on ideal control varied according to the
characteristics of the fiber bundle F. The control unit 7 moves the spinning unit 3 to the
ideal position for every unit time, thereby realizing optimal control, that is, positional control
according to the characteristics of the fiber bundle F. In the present embodiment, the
positional control of the spinning unit 3, the first guiding unit 27, and the second guiding unit
28 can be realized via the movable base unit 25.
[0064] Accordingly, for example, since amplitude andlor cycle can be changed according
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to the thickness of the fiber bundle F, the life of the draft roller pairs 21, 22,23, and 24 (in the
present embodiment, the top rollers 2 1 B, 22B and 24B) can be extended without reducing the
quality of the spun yam Y. Since the optimal positional control can be realized according to
the characteristics of the fiber bundle F, even when the fiber bundle F is thick, the fibers
constituting the fiber bundle F can be prevented from falling off from the draft roller pairs 2 1,
22,23, and 24.
[0065] In the present control mode, the control unit 7 may set the target position and
target speed of the spinning unit 3 and control the driving unit 26, and accordingly, the
movable base unit 25 can be successively reciprocated.
[0066] The target speed of the spinning unit 3 means the ideal speed of the spinning unit
3 for every unit time, which is determined based on ideal control varied according to the
characteristics of the fiber bundle F. The control unit 7 accelerates or decelerates the
spinning unit 3 for every unit time up to the ideal speed, thereby realizing optimal control,
that is, speed control according to the characteristics of the fiber bundle F. In the present
embodiment, the speed control of the spinning unit 3, the first guiding unit 27, and the second
guiding unit 28 can be realized via the movable base unit 25.
[0067] Accordingly, for example, since at least any of the amplitude, the cycle, and the
moving speed can be changed according to the thickness of the fiber bundle F, the occurrence
of periodic unevenness and the like, which reduces the quality of the spun yam Y, can be
reduced. Since the optimal positional control and speed control can be realized according to
the characteristics of the fiber bundle F, even when the fiber bundle F is thick, the fibers
constituting the fiber bundle F can be prevented from falling off from the draft roller pairs 21,
22,23, and 24.
[0068] In the present control mode, the control unit 7 controls the driving unit 26 such
that the position of the spinning unit 3 is adjusted to the origin position 0 at the start time of
spinning. The start of the spinning includes a case where the spinning is restarted after an
interruption of the winding due to a yarn cut, which is attributed to the detection of a defective
portion by the defect detecting unit 4, andlor a yarn breakage during the winding, besides the
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case where the spun yarn Y starts to be wound around a new bobbin B. Hereinafter, a case
where the spun yam Y starts to be wound around a new bobbin B and a case where the
winding is restarted will be described in detail.
[0069] When starting to wind the spun yarn Y around the bobbin B, the fiber bundle F
drafted by the drafi unit 2 is introduced to the spinning unit 3 and spun by swirling airflow in
two different directions in the spinning unit 3, thereby producing the spun yarn Y. The spun
yarn Y from the spinning unit 3 is sucked by a non-illustrated suction pipe, and the spun yarn
Y is positioned with respect to the bobbin B, and the package P is wound by the
above-described method.
[0070] When restarting the winding, the spun yarn Y from the spinning unit 3 is sucked
by a non-illustrated suction pipe and guided to a non-illustrated yam joining device. At the
same time or at almost the same time, another suction pipe sucks the spun yarn Y from the
package P and guides the spun yarn Y to the yarn joining device. The yarn joining device
performs a yarn joining operation of the guided spun yarns Y.
[0071] In the above-described case, when the position of the spinning unit 3 is adjusted to
the origin position 0 , and the fiber bundle F is introduced to the spinning unit 3, the yam path
of the spun yarn Y can be formed straight, which stabilizes the success rate of introducing the
fiber bundle F. If the spinning unit 3 is located at the origin position 0 , the position at which
the non-illustrated suction pipe sucks the spun yarn Y becomes constant. As a result, the
success rate of sucking the spun yarn Y from the spinning unit 3 by the suction pipe is
stabilized.
[0072] For example, when the yarn cut or the yarn breakage occurs, the draft roller pairs
21,22,23, and 24 can be stopped after the position of the spinning unit 3 is adjusted to the
origin position 0. However, when the yarn cut or the yarn breakage occurs, the drafi roller
pairs 2 1,22,23, and 24 may be immediately stopped, and the position of the spinning unit 3
may be adjusted to the origin position 0 at the start time of spinning (at the restart of
spinning).
[0073] As is illustrated in FIG. 7, the origin position 0 in the present embodiment is set at
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a central portion in the shaft direction of the draft roller pairs 2 1,22,23, and 24. The origin
position 0 may not necessarily be provided at the central portion in the shaft direction of the
draft roller pairs 2 1,22,23, and 24 but, for example, may be set at an end portion in the shaft
direction. The position of the origin position 0 is not limited. The origin position 0 is a
position that is set in advance, for example, by an origin determining operation of the driving
unit 26, which is performed by an operator prior to the start of spinning.
[0074] In the present embodiment illustrated in FIG. 7, the displacement of the spinning
unit 3 and the like is moved to the left side of the drawing (right side with respect to the travel
direction of the fiber bundle F) after the start from the origin position 0. The displacement
of the spinning unit 3 and the like may be moved to the right side of the drawing (left side
with respect to the travel direction of the fiber bundle F) after the start from the origin
position 0.
[0075] Next, another control mode of the spinning machine 100 will be described. A
vertical axis of FIG. 8 represents an elapsed time t. A horizontal axis of FIG 8 represents the
displacement of the spinning unit 3 and the like. The displacement of the spinning unit 3
and the like is the distance the spinning unit 3, the first guiding unit 27, and the second
guiding unit 28 moved from the origin position 0.
[0076] In the present control mode, the control unit 7 controls the driving unit 26, thereby
intermittently moving the movable base unit 25. More specifically, in the present control
mode, the control unit 7 sets the target position of the spinning unit 3 and controls the driving
unit 26, thereby intermittently moving the movable base unit 25.
I00771 According to this control mode, the spinning machine 100 can intermittently
change the holding position of the fiber bundle F held by the draft roller pairs 21,22,23, and
24. Accordingly, before abrasion of the draft roller pairs 21,22,23, and 24 (in the present
embodiment, the top rollers 21B, 22B and 24B) exceeds a tolerable range, the holding
position can be changed, thereby extending the life of the draft roller pairs 21,22,23, and 24.
In the present embodiment, since the apron bands 23C and 23C are wound around the middle
roller pair 23, the life of the apron bands 23C can be extended instead of the middle roller pair
Our ref. PC?'-509
23 in a precise sense.
[0078] The target position of the spinning unit 3 means the ideal position of the spinning
unit 3 for every predetermined time, which is determined based on the progress speed of
abrasion, varied according to the characteristics of the fiber bundle F, with regards to the draft
roller pairs 2 1,22,23, and 24 (in the present embodiment, the top rollers 21 B, 22B and 24B).
The control unit 7 controls the spinning unit 3 to be moved to the ideal position for every
predetermined time, thereby realizing optimal control, that is, positional control according to
the characteristics of the fiber bundle F. In the present embodiment, the positional control of
the spinning unit 3, the first guiding unit 27, and the second guiding unit 28 can be realized
via the movable base unit 25.
[0079] Accordingly, since the moving distance and/or moving time can be changed
according to, for example, the thickness of the fiber bundle F, the life of the top rollers 2 1 B,
22B and 24B can be extended. Since the optimal positional control can be realized
according to the characteristics of the fiber bundle F, even if the fiber bundle F is thick, the
fibers constituting the fiber bundle F can be prevented from falling off from the draft roller
pairs 21,22,23, and 24.
[OOSO] A case where the holding position of the fiber bundle F is intermittently changed
includes, for example, a case where the driving unit 26 constituted by the stepping motor 261
is driven stepwise, thereby switching between moving and retaining of the holding position as
required. FIG. 8 illustrates an embodiment in which the holding position is moved stepwise
from the origin position 0 by a moving distance L. The control unit 7 may perform the
positional control of the movable base unit 25 such that after the holding position reaches the
moving distance L, the holding position reaches the origin position 0 again while being
retained at a position where the holding position has not been retained before reaching the
movable distance L.
[0081] When the driving unit 26 is constituted by the stepping motor 26 1, a rotor of the
stepping motor 26 1 is driven so as to rotate forwardhackward. A forward rotation amount
of the rotor is preferably equal to a backward rotation amount, but may be different. A
Our ref. PCT-509
correction value of a rotation amount until the rotor returns to an origin position may be set in
advance in the control unit 7 according to the mounting position of the detecting unit 29,
thereby absorbing a detection error of the detecting unit 29.
[0082] In the present control mode, the control unit 7 sets the target position and the
target speed of the spinning unit 3 and controls the driving unit 26, thereby intermittent
moving the movable base unit 25.
[0083] The target speed of the spinning unit 3 means the ideal speed of the spinning unit
3 for every predetermined time, which is determined based on the progress speed of abrasion,
varied according to the characteristics of the fiber bundle F, with regards to the draft roller
pairs 21,22,23, and 24 (in the present embodiment, the top rollers 21B, 22B, and 24B). The
control unit 7 accelerates the spinning unit 3 to the ideal speed, thereby realizing optimal
control, that is, speed control according to the characteristics of the fiber bundle F, before
abrasion of the draft roller pairs 2 1,22,23, and 24 (in the present embodiment, the top rollers
2 1 B, 22B and 24B) exceeds a tolerable range. In the present embodiment, the speed control
of the spinning unit 3, the first guiding unit 27, and the second guiding unit 28 can be realized
via the movable base unit 25.
[0084] Accordingly, for example, since at least any of the moving distance, the moving
time, and the moving speed can be changed according to the thickness of the fiber bundle F,
the life of the drafl roller pairs 21,22,23, and 24 (in the present embodiment, the top rollers
21B, 22B and 24B) can be extended, and the occurrence of periodic unevenness and the like,
which reduces the quality of the spun yarn Y, can be reduced. Since the optimal positional
control and speed control can be realized according to the characteristics of the fiber bundle F,
even if the fiber bundle F is thick, the fibers constituting the fiber bundle F can be prevented
from falling off from the draft roller pairs 21,22,23, and 24.
[0085] As is described above, the spinning machine 100 of the present embodiment can
extend the life of the top rollers 21B, 22B, and 24B formed of rubber and the like. When the
bottom rollers 2 1 A, 22A, and 24A are formed of rubber and the like, the life of bottom rollers
21A, 22A, and 24A can be extended. Even when the top rollers 21 B, 22B, and 24B and the
Our ref. PCT-509
bottom rollers 2 1 A, 22A, and 24A are respectively formed of materials that wear away, the
life can also be extended.
[0086] Next, other characteristic features added to the above-described control mode will
be described.
[0087] In the present embodiment, the control unit 7 sets the moving distance L of the
movable base unit 25 according to the thickness of the fiber bundle F or the width dimension
W of the draft roller pairs 21,22,23, and 24 (the width dimension of the top roller 24B in the
present embodiment: see FIG. 3) (see FIGS. 7 and 8). The moving distance L of the movable
base unit 25 may be set according to the thickness of the fiber bundle F and the width
dimension W of the draft roller pairs 2 1,22,23, and 24.
[0088] The moving distance L means the maximum distance from the origin position 0,
in which the fibers constituting the fiber bundle F do not fall off from the draft roller pairs 2 1,
22,23, and 24. Since the moving distance L is set based on the thickness of the fiber bundle
F and the like, even when the types of the fiber bundle F drafted by the draft unit 2 are
changed, the spinning machine 100 according to the present embodiment can handle it
accordingly.
[0089] According to this control mode, the spinning machine 100 can obtain a range of
the fiber bundle F that can be held by the draft roller pairs 21,22,23, and 24 to the largest
degree. Furthermore, the life of the top rollers 21B, 22B, and 24B can be extended. Even
when the fiber bundle F is thick, the fibers constituting the fiber bundle F can reliably be
prevented from falling off from the draft roller pairs 21,22,23, and 24.
[0090] When the draft roller pairs 21,22,23, and 24 are rotating, the control unit 7
controls the driving unit 26 to operate, and when the draft roller pairs 21,22,23, and 24 are
not rotating, the control unit 7 stops the driving unit 26. When the fiber bundle F is drafted,
the moving of the spinning unit 3 and the like is carried out, and when the fiber bundle F is
not drafted, the moving of the spinning unit 3 and the like is stopped. In the present
embodiment, when the back roller pair 21 is rotating, the driving unit 26 is operated, and
when the back roller pair 21 is not rotating, the driving unit 26 is stopped. Among the
Our ref. PCT-509
plurality of the draft roller pairs 21, 22, 23, and 24, when at least the draft roller pair that is
holding the fiber bundle F is rotating, the driving unit 26 is preferably operated.
[0091] According to this control mode, the spinning machine 100 can avoid the
unintentional cutting of the fiber bundle F held by the draft roller pairs 2 1,22,23, and 24
while the draft unit 2 is being stopped.
[0092] When the fiber bundle F is thicker than a predetermined value, the control unit 7
stops the driving unit 26. Specifically, an operator inputs the type of the fiber bundle F to be
spun by the spinning machine 100 through the setting unit 8. The control unit 7 determines
whether or not the thickness of the fiber bundle F exceeds the predetermined value based on
the input information of the fiber bundle F. When the thickness of the fiber bundle F
exceeds the predetermined value, the control unit 7 performs control such that the driving unit
26 is stopped.
[0093] According to this control mode, even when the fiber bundle F is thick, the
spinning machine 100 can reliably prevent the fibers constituting the fiber bundle F from
falling off from the draft roller pairs 2 1,22,23, and 24.
[0094] Next, other characteristic features of the spinning machine 100 according to the
present embodiment will be described.
[0095] The spinning unit 3 constituting the spinning machine 100 is an air spinning
device 3 that twists the fiber bundle F with swirling airflow. The air spinning device 3 forms
the swirling airflow in a spinning chamber SC and twists the fiber bundle F by the swirling
airflow. The spinning chamber SC is divided into a space SC1 formed between a fiber guide
3 1 and a spindle 32 and a space SC2 formed between the spindle 32 and a nozzle block 33.
[0096] In the space SC1, rear end portion of the fibers constituting the fiber bundle F is
inverted by the swirling airflow (see a chain double-dashed line in the drawing). In the
space SC2, the rear end portion of each inverted fiber is rotated by the swirling airflow (see
the chain double-dashed line in the drawing). The rotated rear end portion of the fibers is
sequentially wound around the fibers at the central portion. Thus, the air spinning device 3
can spin the fiber bundle F into the spun yarn Y.
Our ref. PCT-509
[0097] Further, as is illustrated in FIG. 9, a needle is provided in the fiber guide 3 1 in the
air spinning device 3 according to the present embodiment. The needle is provided in order
to guide the fiber bundle F to the spindle 32 and prevent the twists of the fibers from
propagating to the upstream side. However, the needle of the fiber guide 3 1 may be omitted.
[0098] The spinning machine 100 can produce the spun yarn Y at a high spinning speed.
When the spinning speed becomes high, behavior of the fibers of the fiber bundle F becomes
more easily affected by external change. The progress of abrasion of the draft roller pairs 2 1,
22,23, and 24 (in the present embodiment, the top rollers 21B, 22B and 24B) also becomes
fast by the fiber bundle F that is drafted at a high speed. The positional control of the
movable base unit 25 is performed, and the movable base unit 25 is moved, thereby
appropriately extending the life of the draft roller pairs 21,22,23, and 24 without affecting
the behavior of the fibers of the fiber bundle F.
[0099] As long as the spinning unit 3 is configured to twist the fiber bundle F by the
swirling airflow, any configuration may be applied irrespective of details. For example, two
swirling airflows flowing in different directions from each other may be formed, and the fiber
bundle F may be twisted by these swirling airflows (for example, Japanese Unexamined
Patent Application Publication No. 1993-865 10, Japanese Unexamined Patent Application
Publication No. 2006- 16 1 17 1, and the like). The spinning machine 100 can perform the
optimal control according to the characteristics of the fiber bundle F.
[0100] Furthermore, as described above, the spinning machine 100 includes the winding
unit 6 that winds the spun yarn Y and forms the packages P (see FIG. 1). Since the spinning
machine 100 can extend the life of the top rollers 2 1 B, 22B, , and 24B, the packages P can
successively be produced over a long period of time. The spinning machine 100 can
improve the production capacity of the packages P.
[0101] In the above-described embodiment, the detecting unit 29 detects the position of
the movable base unit 25, and the control unit 7 controls the position or/and the speed of the
movable base unit 25 based on the detection result of the detecting unit 29. The control unit
7 may hrther include a memory unit (not illustrated) that stores history of the holding
Our ref. PCT-509
position of the fiber bundle F held by the front roller pair 24 and the driving amount of the
driving unit 26, which indicates the change (speed and time) of the holding position, based on
the detection result of the detecting unit 29, and a storing unit (not illustrated) that stores a
durability threshold value of the front roller pair 24.
[0102] In this case, the control unit 7 compares the driving amount stored in the memory
unit with the durability threshold value stored in the storing unit and determines whether there
remains a portion that can further perform the drafting by the front roller pair 24. When the
control unit 7 determines that there remains the portion that can perform the drafting, the
control unit 7 controls the position orland the speed of the movable base unit 25 such that the
fiber bundle F is positioned at the corresponding portion and the fiber bundle F is drafted.
Accordingly, the front roller pair 24 (in the present embodiment, the top roller 24B), which is
easily worn at the high speed spinning, can be used to the limit thereof.
[0103] When the top roller 24B is replaced with a new top roller 24B, the operator may
input the replacement to the control unit 7, which resets the content stored in the memory unit.
[0104] In the present embodiment, one set of spinning machine 100 is provided.
However, a plurality of spinning machines 100 may be aligned side by side, thereby
constituting a textile machine. In this case, the movable base units 25 may be moved in the
same direction or may be moved in different directions in adjacent spinning machines 100.
When the movable base units 25 are moved in different directions, vibration which is
attributed to the movement of the movable base units 25 in the same direction can be
restrained.
[0105] The spinning machine 100 includes the draft roller pairs 21,22,23, and 24
configured to draft the fiber bundle F, the guiding units 27 and 28 configured to regulate the
width of the fiber bundle F drafted by the draft roller pairs 21,22,23, and 24 and guide the
fiber bundle F, the spinning unit 3 configured to produce the spun yarn Y by twisting the fiber
bundle F drafted by the draft roller pairs 21, 22,23, and 24, the movable base unit 25 to which
the guiding units 27 and 28 and the spinning unit 3 are mounted, the driving unit 26
configured to move the movable base unit 25 in parallel with respect to the rotating shaft
Our ref. PCT-509
direction of the draft roller pairs 2 l,22, 23, and 24, the detecting unit 29 configured to detect
a position of at least any of the guiding units 27 and 28, the spinning unit 3, and the movable
base unit 25, and the control unit 7 configured to transmit the positional command signal to
the driving unit 26 based on the detection signal from the detecting unit 29 and control the
position of the movable base unit 25, thereby adjusting the relative positional relation of the
guiding units 27 and 28 and the spinning unit 3 with respect to the draft roller pairs 2 1,22,23,
and 24 and changing the holding position of the fiber bundle F held with the draft roller pairs
21,22,23, and 24.
[0106] The spinning machine 100 includes the draft roller pairs 21,22,23, and 24
configured to draft the fiber bundle F, the guiding units 27 and 28 configured to regulate the
width of the fiber bundle F drafted by the draft roller pairs 21,22,23, and 24 and guide the
fiber bundle F, the spinning unit 3 configured to produce the spun yarn Y by twisting the fiber
bundle F drafted by the draR roller pairs 21,22,23, and 24, the movable base unit 25 to which
the guiding units 27 and 28 and the spinning unit 3 are mounted, the driving unit 26
configured to move the movable base unit 25 in parallel with respect to the rotating shaft
direction of the draft roller pairs 21,22,23, and 24, the detecting unit 29 configured to detect
a position of at least one of the guiding units 27 and 28, the spinning unit 3, and the movable
base unit 25, and the control unit 7 configured to transmit the positional command signal and
the speed command signal to the driving unit 26 based on the detection signal from the
detecting unit 29 and control the position and the speed of the movable base unit 25, thereby
adjusting the relative positional relation of the guiding units 27 and 28 and the spinning unit 3
with respect to the draft roller pairs 21,22,23, and 24 and changing the holding position of
the fiber bundle F with the draft roller pairs 21,22,23, and 24.
[0107] The control unit 7 controls the driving unit 26 to continuously reciprocate the
movable base unit 25. Alternatively, the control unit 7 controls the driving unit 26 to
intermittently move the movable base unit 25.
[0108] The control unit 7 controls the driving unit 26 to adjust the relative position of the
spinning unit 3 with respect to the draft roller pairs 21,22,23, and 24 at a start time of
Our ref. PCT-509
spinning to an origin position. The control unit 7 controls movement of the movable base
unit 25 according to a thickness of the fiber bundle F orland a width dimension in the rotating
shaft direction of the drafi roller pairs 21,22,23, and 24.
[0109] When the draft roller pairs 21,22,23, and 24 are rotating, the control unit 7
controls the driving unit 26 to operate, and when the draft roller pairs 21,22,23, and 24 are
not rotating, the control unit 7 controls the driving unit 26 to stop. When the fiber bundle F
drafted by the draft roller pairs 21,22,23, and 24 is larger than a predetermined value, the
control unit 7 stops the driving unit 26.
[0110] The driving unit 26 is constituted by the stepping motor. The spinning unit 2
twists the fiber bundle F with the swirling airflow and produces the spun yarn Y.
[0111] The spinning machine 100 includes the setting unit 8 that can set the control mode
of the driving unit 26. The spinning machine 100 includes the winding unit 6 configured to
wind the spun yarn Y around the package P.
[0112] The spinning machine 100 includes the memory unit configured to store the
driving amount of the driving unit 26 and the storing unit configured to store the durability
threshold value of the draft roller pairs 21,22,23, and 24. The control unit 7 changes the
holding position of the fiber bundle F held by the draft roller pairs 21,22,23, and 24 based on
the driving amount stored in the memory unit and the durability threshold value stored in the
storing unit.
[Industrial Applicability]
[0113] A spinning machine of the present invention can extend the life of draft roller pairs
without reducing the quality of spun yarns, which is industrially useful.
[Reference Signs List]
[0114] 1 00 spinning machine
1 sliver supply unit
2 draft unit
21 back roller pair (draft roller pair)
21A bottom roller
Our ref. PCT-509
2 1 B top roller
22 third roller pair (draft roller pair)
22A bottom roller
22B top roller
23 middle roller pair (draft roller pair)
23A bottom roller
23B top roller
24 front roller pair (draft roller pair)
24A bottom roller
24B top roller
25 movable base unit
26 driving unit
27 first guiding unit
28 second guiding unit
29 detecting unit
3 spinning unit
4 defect detecting unit
5 tension stabilizing unit
6 winding unit
7 control unit
F fiber bundle (sliver)
Y spun yarn
CLAIMS AMENDED UNDER ARTICLU
WE CLAIM:
1. A spinning machine comprising:
draft roller pairs configured to draft a fiber bundle;
a guiding unit configured to regulate a width of the fiber bundle drafted by the draft
roller pairs and guide the fiber bundle;
a spinning unit configured to produce a spun yarn by twisting the fiber bundle drafted by
the draft roller pairs;
a movable base unit to which the guiding unit and the spinning unit are mounted;
a driving unit configured to move the movable base unit in parallel with respect to a
rotating shaft direction of the draft roller pairs;
a detecting unit configured to detect a position of at least one of the guiding unit, the
spinning unit, and the movable base unit; and
a control unit configured to transmit a positional command signal to the driving unit
based on a detection signal from the detecting unit and control a position of the movable base
unit, thereby adjusting a relative positional relation of the guiding unit and the spinning unit
with respect to the draft roller pairs and changing a holding position of the fiber bundle held
by the draft roller pairs.
2. A spinning machine comprising:
draft roller pairs configured to draft a fiber bundle;
a guiding unit configured to regulate a width of the fiber bundle drafted by the draft
roller pairs and guide the fiber bundle;
a spinning unit configured to produce a spun yarn by twisting the fiber bundle drafted by
the draft roller pairs;
a movable base unit to which the guiding unit and the spinning unit are mounted;
a driving unit configured to move the movable base unit in parallel with respect to a
rotating shaft direction of the draft roller pairs;
a detecting unit configured to detect a position of at least one of the guiding unit, the
CLAIMS AMENDED UNDER ARTICLE 19
spinning unit, and the movable base unit; and
a control unit configured to transmit a positional command signal and a speed command
signal to the driving unit based on a detection signal from the detecting unit and control a
position and a speed of the movable base unit, thereby adjusting a relative positional relation
of the guiding unit and the spinning unit with respect to the draft roller pairs and changing a
holding position of the fiber bundle held by the draft roller pairs.
3. The spinning machine according to claim 1 or 2, further comprising a first guiding unit
arranged upstream of the draft roller pairs in a feeding direction of the fiber bundle and
provided not movable with respect to the draft roller pairs,
wherein the guiding unit mounted to the movable base unit is arranged between the
plurality of the draft roller pairs arranged along the feeding direction of the fiber bundle, and
the control unit controls the driving unit to successively reciprocate the movable base
unit.
4. The spinning machine according to claim 1 or 2, wherein the control unit controls the
driving unit to intermittently feed and move the movable base unit.
5. The spinning machine according to any one of claims 1 to 3, wherein the control unit
controls the driving unit to adjust a relative position of the spinning unit with respect to the
draft roller pairs at a start time of spinning to an origin position.
6. The spinning machine according to any one of claims 1 to 5, wherein the control unit
controls a movement of the movable base unit according to a thickness of the fiber bundle
orland a width dimension in the rotating shaft direction of the draft roller pairs.
CLAIMS AMENDED UNDER ARTICLE 19
7. The spinning machine according to any one of claims 1 to 6, wherein when the draft
roller pairs are rotating, the control unit controls the driving unit to operate, and when the
draft roller pairs are not rotating, the control unit controls the driving unit to stop.
8. The spinning machine according to any one of claims 1 to 7, wherein when the fiber
bundle drafted by the draft roller pairs is larger than a predetermined value, the driving unit is
stopped.
9. The spinning machine according to any one of claims 1 to 8, wherein the driving unit is
constituted by a stepping motor.
10. The spinning machine according to any one of claims 1 to 9, wherein the spinning
unit twists the fiber bundle with swirling airflow and produces the spun yarn.
11. The spinning machine according to any one of claims 1 to 10, further comprising a
setting unit configured to set control mode of the driving unit.
12. The spinning machine according to any one of claims 1 to 11, further comprising a
winding unit configured to wind the spun yarn around a package.
13. The spinning machine according to any one of claims 1 to 12, further comprising:
a memory unit configured to store a driving amount of the driving unit; and
a storing unit configured to store a durability threshold value of the draft roller pairs,
wherein the control unit changes the holding position of the fiber bundle held by the
draft roller pairs based on the driving amount stored in the memory unit and the durability
threshold value stored in the storing unit.